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Perl 5.22.1-RC4 today
[perl5.git] / gv.c
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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW		 9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW		 14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW		 20 */
21
ccfc67b7
JH		 22/*
23=head1 GV Functions
166f8a29
DM		 24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH		 32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
6ffcffbd 37#include "overload.inc"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a 41static const char S_autoload[] = "AUTOLOAD";
3c81f0b3 42#define S_autolen (sizeof("AUTOLOAD")-1)
5c7983e5 43
13c59d41
MH		 44GV *
45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13c59d41
MH		 49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
13be902c 53 && SvTYPE((const SV *)gv) != SVt_PVLV
13c59d41 54 )
13be902c 55 ) {
bb85b28a 56 const char *what;
13c59d41 57 if (type == SVt_PVIO) {
bb85b28a
NC		 58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
13c59d41 64 } else if (type == SVt_PVHV) {
bb85b28a
NC		 65 what = "hash";
66 } else {
13c59d41 67 what = type == SVt_PVAV ? "array" : "scalar";
bb85b28a 68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC		 70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896 72
13c59d41
MH		 73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
13c59d41
MH		 83 if (!*where)
84 {
85 *where = newSV_type(type);
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
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));
81d52ecd 388
42d0e0b7 389 default: NOOP;
5c1f4d79 390 }
756cb477
NC		 391 SvRV_set(gv, NULL);
392 SvROK_off(gv);
393 }
463ee0b2 394
3b6733bf
NC		 395
396 if (old_type < SVt_PVGV) {
397 if (old_type >= SVt_PV)
398 SvCUR_set(gv, 0);
ad64d0ec 399 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 400 }
55d729e4
GS		 401 if (SvLEN(gv)) {
402 if (proto) {
f880fe2f 403 SvPV_set(gv, NULL);
b162af07 404 SvLEN_set(gv, 0);
55d729e4
GS		 405 SvPOK_off(gv);
406 } else
94010e71 407 Safefree(SvPVX_mutable(gv));
55d729e4 408 }
2e5b91de
NC		 409 SvIOK_off(gv);
410 isGV_with_GP_on(gv);
12816592 411
c43ae56f 412 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC		 413 GvSTASH(gv) = stash;
414 if (stash)
ad64d0ec 415 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 416 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 417 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
418 GvMULTI_on(gv); /* _was_ mentioned */
2eaf799e
FC		 419 if (has_constant && SvTYPE(has_constant) == SVt_PVCV) {
420 /* Not actually a constant. Just a regular sub. */
421 CV * const cv = (CV *)has_constant;
422 GvCV_set(gv,cv);
423 if (CvSTASH(cv) == stash && (
424 CvNAME_HEK(cv) == GvNAME_HEK(gv)
425 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
426 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
427 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
428 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
429 )
430 ))
431 CvGV_set(cv,gv);
432 }
433 else if (doproto) {
e3d2b9e7 434 CV *cv;
756cb477
NC		 435 if (has_constant) {
436 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 437 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 438 /* In case op.c:S_process_special_blocks stole it: */
439 if (!GvCV(gv))
c43ae56f 440 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 441 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 442 /* If this reference was a copy of another, then the subroutine
443 must have been "imported", by a Perl space assignment to a GV
444 from a reference to CV. */
445 if (exported_constant)
446 GvIMPORTED_CV_on(gv);
186a5ba8 447 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 448 } else {
186a5ba8 449 cv = newSTUB(gv,1);
756cb477 450 }
55d729e4 451 if (proto) {
e3d2b9e7 452 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 453 SV_HAS_TRAILING_NUL);
e0260a5b 454 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 455 }
456 }
463ee0b2
LW		 457}
458
76e3520e 459STATIC void
e6066781 460S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 461{
13c59d41
MH		 462 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
463
464 switch (sv_type) {
465 case SVt_PVIO:
466 (void)GvIOn(gv);
467 break;
468 case SVt_PVAV:
469 (void)GvAVn(gv);
470 break;
471 case SVt_PVHV:
472 (void)GvHVn(gv);
473 break;
c69033f2 474#ifdef PERL_DONT_CREATE_GVSV
13c59d41
MH		 475 case SVt_NULL:
476 case SVt_PVCV:
477 case SVt_PVFM:
478 case SVt_PVGV:
479 break;
480 default:
481 if(GvSVn(gv)) {
482 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
483 If we just cast GvSVn(gv) to void, it ignores evaluating it for
484 its side effect */
485 }
c69033f2 486#endif
a0d0e21e
LW		 487 }
488}
489
0f8d4b5e
FC		 490static void core_xsub(pTHX_ CV* cv);
491
492static GV *
493S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 494 const char * const name, const STRLEN len)
0f8d4b5e
FC		 495{
496 const int code = keyword(name, len, 1);
497 static const char file[] = __FILE__;
97021f77 498 CV *cv, *oldcompcv = NULL;
0f8d4b5e 499 int opnum = 0;
0f8d4b5e 500 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 501 COP *oldcurcop = NULL;
502 yy_parser *oldparser = NULL;
503 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 504
505 assert(gv || stash);
506 assert(name);
0f8d4b5e 507
88b892d8
FC		 508 if (!code) return NULL; /* Not a keyword */
509 switch (code < 0 ? -code : code) {
0f8d4b5e 510 /* no support for \&CORE::infix;
d885f758 511 no support for funcs that do not parse like funcs */
88b892d8 512 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 513 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 514 case KEY_default : case KEY_DESTROY:
88b892d8 515 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 516 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 517 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 518 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC		 519 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
520 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
521 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 522 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 523 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 524 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 525 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 526 case KEY_state: case KEY_sub :
46bef06f 527 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC		 528 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
529 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 530 return NULL;
531 case KEY_chdir:
eb31eb35 532 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 533 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC		 534 case KEY_keys:
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:
544 case KEY_values:
545 ampable = FALSE;
546 }
547 if (!gv) {
548 gv = (GV *)newSV(0);
549 gv_init(gv, stash, name, len, TRUE);
550 }
7e68c38b 551 GvMULTI_on(gv);
0f8d4b5e
FC		 552 if (ampable) {
553 ENTER;
554 oldcurcop = PL_curcop;
555 oldparser = PL_parser;
556 lex_start(NULL, NULL, 0);
557 oldcompcv = PL_compcv;
558 PL_compcv = NULL; /* Prevent start_subparse from setting
559 CvOUTSIDE. */
560 oldsavestack_ix = start_subparse(FALSE,0);
561 cv = PL_compcv;
562 }
563 else {
564 /* Avoid calling newXS, as it calls us, and things start to
565 get hairy. */
566 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
567 GvCV_set(gv,cv);
568 GvCVGEN(gv) = 0;
0f8d4b5e
FC		 569 CvISXSUB_on(cv);
570 CvXSUB(cv) = core_xsub;
eacbb379 571 PoisonPADLIST(cv);
0f8d4b5e
FC		 572 }
573 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
574 from PL_curcop. */
9b669ea1
DD		 575 /* XSUBs can't be perl lang/perl5db.pl debugged
576 if (PERLDB_LINE_OR_SAVESRC)
577 (void)gv_fetchfile(file); */
0f8d4b5e
FC		 578 CvFILE(cv) = (char *)file;
579 /* XXX This is inefficient, as doing things this order causes
580 a prototype check in newATTRSUB. But we have to do
581 it this order as we need an op number before calling
582 new ATTRSUB. */
583 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 584 if (stash)
73c02f15 585 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 586 if (ampable) {
4428fb0e
TC		 587#ifdef DEBUGGING
588 CV *orig_cv = cv;
589#endif
0f8d4b5e 590 CvLVALUE_on(cv);
4428fb0e
TC		 591 /* newATTRSUB will free the CV and return NULL if we're still
592 compiling after a syntax error */
e8f91c91 593 if ((cv = newATTRSUB_x(
7e68c38b 594 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 595 NULL,NULL,
596 coresub_op(
597 opnum
598 ? newSVuv((UV)opnum)
599 : newSVpvn(name,len),
600 code, opnum
7e68c38b 601 ),
e8f91c91 602 TRUE
4428fb0e
TC		 603 )) != NULL) {
604 assert(GvCV(gv) == orig_cv);
605 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
606 && opnum != OP_UNDEF)
607 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
608 }
0f8d4b5e
FC		 609 LEAVE;
610 PL_parser = oldparser;
611 PL_curcop = oldcurcop;
612 PL_compcv = oldcompcv;
613 }
4428fb0e
TC		 614 if (cv) {
615 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
616 cv_set_call_checker(
617 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
618 );
619 SvREFCNT_dec(opnumsv);
620 }
621
0f8d4b5e
FC		 622 return gv;
623}
624
954c1994 625/*
6c53d59b
FC		 626=for apidoc gv_fetchmeth
627
628Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
629
e6919483
BF		 630=for apidoc gv_fetchmeth_sv
631
632Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
633of an SV instead of a string/length pair.
634
635=cut
636*/
637
638GV *
639Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
640{
c290e187 641 char *namepv;
642 STRLEN namelen;
643 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
644 if (LIKELY(SvPOK_nog(namesv))) /* common case */
645 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, flags);
646 namepv = SvPV(namesv, namelen);
647 if (SvUTF8(namesv)) flags |= SVf_UTF8;
648 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF		 649}
650
651/*
652=for apidoc gv_fetchmeth_pv
653
654Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
655instead of a string/length pair.
656
657=cut
658*/
659
660GV *
661Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
662{
663 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 664 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF		 665}
666
667/*
668=for apidoc gv_fetchmeth_pvn
954c1994
GS		 669
670Returns the glob with the given C<name> and a defined subroutine or
671C<NULL>. The glob lives in the given C<stash>, or in the stashes
796b6530 672accessible via C<@ISA> and C<UNIVERSAL::>.
954c1994
GS		 673
674The argument C<level> should be either 0 or -1. If C<level==0>, as a
675side-effect creates a glob with the given C<name> in the given C<stash>
676which in the case of success contains an alias for the subroutine, and sets
e1a479c5 677up caching info for this glob.
954c1994 678
796b6530 679The only significant values for C<flags> are C<GV_SUPER> and C<SVf_UTF8>.
aae43805 680
796b6530 681C<GV_SUPER> indicates that we want to look up the method in the superclasses
aae43805 682of the C<stash>.
e6919483 683
aae43805 684The
954c1994 685GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 686visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 687the GV directly; instead, you should use the method's CV, which can be
b267980d 688obtained from the GV with the C<GvCV> macro.
954c1994
GS		 689
690=cut
691*/
692
e1a479c5
BB		 693/* NOTE: No support for tied ISA */
694
c6afe666 695PERL_STATIC_INLINE GV*
696S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 697{
463ee0b2 698 GV** gvp;
c6afe666 699 HE* he;
e1a479c5
BB		 700 AV* linear_av;
701 SV** linear_svp;
702 SV* linear_sv;
aae43805 703 HV* cstash, *cachestash;
e1a479c5
BB		 704 GV* candidate = NULL;
705 CV* cand_cv = NULL;
e1a479c5 706 GV* topgv = NULL;
bfcb3514 707 const char *hvname;
c6afe666 708 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 709 I32 items;
e1a479c5 710 U32 topgen_cmp;
04f3bf56 711 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 712
af09ea45
IK		 713 /* UNIVERSAL methods should be callable without a stash */
714 if (!stash) {
e1a479c5 715 create = 0; /* probably appropriate */
da51bb9b 716 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 717 return 0;
718 }
719
e1a479c5
BB		 720 assert(stash);
721
bfcb3514
NC		 722 hvname = HvNAME_get(stash);
723 if (!hvname)
e1a479c5 724 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 725
e1a479c5 726 assert(hvname);
55df6700 727 assert(name || meth);
463ee0b2 728
aae43805 729 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC		 730 flags & GV_SUPER ? "SUPER " : "",
731 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 732
dd69841b 733 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 734
aae43805 735 if (flags & GV_SUPER) {
1a33a059
FC		 736 if (!HvAUX(stash)->xhv_mro_meta->super)
737 HvAUX(stash)->xhv_mro_meta->super = newHV();
738 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC		 739 }
740 else cachestash = stash;
741
e1a479c5 742 /* check locally for a real method or a cache entry */
c6afe666 743 he = (HE*)hv_common(
744 cachestash, meth, name, len, (flags & SVf_UTF8) ? HVhek_UTF8 : 0, create, NULL, 0
745 );
746 if (he) gvp = (GV**)&HeVAL(he);
747 else gvp = NULL;
748
e1a479c5
BB		 749 if(gvp) {
750 topgv = *gvp;
0f8d4b5e 751 have_gv:
e1a479c5
BB		 752 assert(topgv);
753 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC		 754 {
755 if (!name)
756 name = SvPV_nomg(meth, len);
04ec7e59 757 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 758 }
e1a479c5
BB		 759 if ((cand_cv = GvCV(topgv))) {
760 /* If genuine method or valid cache entry, use it */
761 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
762 return topgv;
763 }
764 else {
765 /* stale cache entry, junk it and move on */
e7881358 766 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 767 GvCV_set(topgv, NULL);
768 cand_cv = NULL;
e1a479c5
BB		 769 GvCVGEN(topgv) = 0;
770 }
771 }
772 else if (GvCVGEN(topgv) == topgen_cmp) {
773 /* cache indicates no such method definitively */
774 return 0;
775 }
aae43805
FC		 776 else if (stash == cachestash
777 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 778 && strnEQ(hvname, "CORE", 4)
87566176 779 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 780 goto have_gv;
463ee0b2 781 }
79072805 782
aae43805 783 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 784 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
785 items = AvFILLp(linear_av); /* no +1, to skip over self */
786 while (items--) {
787 linear_sv = *linear_svp++;
788 assert(linear_sv);
789 cstash = gv_stashsv(linear_sv, 0);
790
dd69841b 791 if (!cstash) {
ecad31f0 792 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 793 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 794 SVfARG(linear_sv),
d0c0e7dd 795 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 796 continue;
797 }
9607fc9c 798
e1a479c5
BB		 799 assert(cstash);
800
c60dbbc3 801 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 802 if (!gvp) {
803 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
804 const char *hvname = HvNAME(cstash); assert(hvname);
805 if (strnEQ(hvname, "CORE", 4)
806 && (candidate =
87566176 807 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 808 ))
809 goto have_candidate;
810 }
811 continue;
812 }
813 else candidate = *gvp;
814 have_candidate:
e1a479c5 815 assert(candidate);
04f3bf56 816 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 817 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 818 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
819 /*
820 * Found real method, cache method in topgv if:
821 * 1. topgv has no synonyms (else inheritance crosses wires)
822 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
823 */
824 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 825 CV *old_cv = GvCV(topgv);
826 SvREFCNT_dec(old_cv);
e1a479c5 827 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 828 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 829 GvCVGEN(topgv) = topgen_cmp;
830 }
831 return candidate;
832 }
833 }
9607fc9c 834
e1a479c5
BB		 835 /* Check UNIVERSAL without caching */
836 if(level == 0 || level == -1) {
55df6700
FC		 837 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
838 flags &~GV_SUPER);
e1a479c5
BB		 839 if(candidate) {
840 cand_cv = GvCV(candidate);
841 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 842 CV *old_cv = GvCV(topgv);
843 SvREFCNT_dec(old_cv);
e1a479c5 844 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 845 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 846 GvCVGEN(topgv) = topgen_cmp;
847 }
848 return candidate;
849 }
850 }
851
852 if (topgv && GvREFCNT(topgv) == 1) {
853 /* cache the fact that the method is not defined */
854 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 855 }
856
79072805
LW		 857 return 0;
858}
859
c6afe666 860GV *
861Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
862{
863 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
864 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
865}
866
954c1994 867/*
460e5730
FC		 868=for apidoc gv_fetchmeth_autoload
869
870This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
871parameter.
872
d21989ed 873=for apidoc gv_fetchmeth_sv_autoload
611c1e95 874
d21989ed
BF		 875Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
876of an SV instead of a string/length pair.
877
878=cut
879*/
880
881GV *
882Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
883{
884 char *namepv;
885 STRLEN namelen;
886 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
887 namepv = SvPV(namesv, namelen);
888 if (SvUTF8(namesv))
889 flags |= SVf_UTF8;
890 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
891}
892
893/*
894=for apidoc gv_fetchmeth_pv_autoload
895
896Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
897instead of a string/length pair.
898
899=cut
900*/
901
902GV *
903Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
904{
905 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
906 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
907}
908
909/*
910=for apidoc gv_fetchmeth_pvn_autoload
911
796b6530 912Same as C<gv_fetchmeth_pvn()>, but looks for autoloaded subroutines too.
611c1e95
IZ		 913Returns a glob for the subroutine.
914
915For an autoloaded subroutine without a GV, will create a GV even
796b6530 916if C<level < 0>. For an autoloaded subroutine without a stub, C<GvCV()>
611c1e95
IZ		 917of the result may be zero.
918
796b6530 919Currently, the only significant value for C<flags> is C<SVf_UTF8>.
d21989ed 920
611c1e95
IZ		 921=cut
922*/
923
924GV *
d21989ed 925Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 926{
499321d3 927 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 928
d21989ed 929 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 930
611c1e95 931 if (!gv) {
611c1e95
IZ		 932 CV *cv;
933 GV **gvp;
934
935 if (!stash)
6136c704 936 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 937 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 938 return NULL;
d21989ed 939 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 940 return NULL;
611c1e95
IZ		 941 cv = GvCV(gv);
942 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 943 return NULL;
611c1e95
IZ		 944 /* Have an autoload */
945 if (level < 0) /* Cannot do without a stub */
d21989ed 946 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 947 gvp = (GV**)hv_fetch(stash, name,
948 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 949 if (!gvp)
6136c704 950 return NULL;
611c1e95
IZ		 951 return *gvp;
952 }
953 return gv;
954}
955
956/*
954c1994
GS		 957=for apidoc gv_fetchmethod_autoload
958
959Returns the glob which contains the subroutine to call to invoke the method
960on the C<stash>. In fact in the presence of autoloading this may be the
796b6530 961glob for "AUTOLOAD". In this case the corresponding variable C<$AUTOLOAD> is
b267980d 962already setup.
954c1994
GS		 963
964The third parameter of C<gv_fetchmethod_autoload> determines whether
965AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 966means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 967Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 968with a non-zero C<autoload> parameter.
954c1994 969
cec2d7b1
FC		 970These functions grant C<"SUPER"> token
971as a prefix of the method name. Note
954c1994
GS		 972that if you want to keep the returned glob for a long time, you need to
973check for it being "AUTOLOAD", since at the later time the call may load a
796b6530 974different subroutine due to C<$AUTOLOAD> changing its value. Use the glob
cec2d7b1 975created as a side effect to do this.
954c1994 976
cec2d7b1
FC		 977These functions have the same side-effects as C<gv_fetchmeth> with
978C<level==0>. The warning against passing the GV returned by
979C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS		 980
981=cut
982*/
983
dc848c6f 984GV *
864dbfa3 985Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 986{
547bb267
NC		 987 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
988
256d1bb2
NC		 989 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
990}
991
44130a26
BF		 992GV *
993Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
994{
995 char *namepv;
996 STRLEN namelen;
997 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
998 namepv = SvPV(namesv, namelen);
999 if (SvUTF8(namesv))
1000 flags |= SVf_UTF8;
1001 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
1002}
1003
1004GV *
1005Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1006{
1007 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1008 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1009}
1010
256d1bb2
NC		 1011/* Don't merge this yet, as it's likely to get a len parameter, and possibly
1012 even a U32 hash */
1013GV *
44130a26 1014Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1015{
eb578fdb 1016 const char *nend;
c445ea15 1017 const char *nsplit = NULL;
a0d0e21e 1018 GV* gv;
0dae17bd 1019 HV* ostash = stash;
c94593d0 1020 const char * const origname = name;
ad64d0ec 1021 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 1022 const U32 autoload = flags & GV_AUTOLOAD;
1023 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1024 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1025
44130a26 1026 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1027
eff494dd 1028 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1029 stash = NULL;
c9bf4021
NC		 1030 else {
1031 /* The only way stash can become NULL later on is if nsplit is set,
1032 which in turn means that there is no need for a SVt_PVHV case
1033 the error reporting code. */
1034 }
b267980d 1035
44130a26 1036 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 1037 if (*nend == '\'') {
a0d0e21e 1038 nsplit = nend;
c94593d0
NC		 1039 name = nend + 1;
1040 }
1041 else if (*nend == ':' && *(nend + 1) == ':') {
1042 nsplit = nend++;
1043 name = nend + 1;
1044 }
a0d0e21e
LW		 1045 }
1046 if (nsplit) {
7edbdc6b 1047 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 1048 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 1049 stash = CopSTASH(PL_curcop);
1050 flags |= GV_SUPER;
cea2e8a9 1051 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1052 origname, HvENAME_get(stash), name) );
4633a7c4 1053 }
aae43805
FC		 1054 else if ((nsplit - origname) >= 7 &&
1055 strnEQ(nsplit - 7, "::SUPER", 7)) {
1056 /* don't autovifify if ->NoSuchStash::SUPER::method */
1057 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
1058 if (stash) flags |= GV_SUPER;
1059 }
e189a56d 1060 else {
af09ea45 1061 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1062 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 1063 }
0dae17bd 1064 ostash = stash;
4633a7c4
LW		 1065 }
1066
14d1dfbd 1067 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1068 if (!gv) {
2f6e0fe7 1069 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1070 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1071 else if (autoload)
c8416c26
BF		 1072 gv = gv_autoload_pvn(
1073 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1074 );
256d1bb2
NC		 1075 if (!gv && do_croak) {
1076 /* Right now this is exclusively for the benefit of S_method_common
1077 in pp_hot.c */
1078 if (stash) {
15e6cdd9
DG		 1079 /* If we can't find an IO::File method, it might be a call on
1080 * a filehandle. If IO:File has not been loaded, try to
1081 * require it first instead of croaking */
1082 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1083 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1084 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1085 STR_WITH_LEN("IO/File.pm"), 0,
1086 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1087 ) {
31b05a0f 1088 require_pv("IO/File.pm");
14d1dfbd 1089 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG		 1090 if (gv)
1091 return gv;
1092 }
256d1bb2 1093 Perl_croak(aTHX_
b17a0679 1094 "Can't locate object method \"%"UTF8f
d0c0e7dd 1095 "\" via package \"%"HEKf"\"",
b17a0679 1096 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1097 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1098 }
1099 else {
ecad31f0 1100 SV* packnamesv;
256d1bb2 1101
256d1bb2 1102 if (nsplit) {
ecad31f0
BF		 1103 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1104 SVs_TEMP | is_utf8);
256d1bb2 1105 } else {
017c5e4e 1106 packnamesv = error_report;
256d1bb2
NC		 1107 }
1108
1109 Perl_croak(aTHX_
b17a0679
FC		 1110 "Can't locate object method \"%"UTF8f
1111 "\" via package \"%"SVf"\""
ecad31f0 1112 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1113 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1114 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1115 }
1116 }
463ee0b2 1117 }
dc848c6f 1118 else if (autoload) {
9d4ba2ae 1119 CV* const cv = GvCV(gv);
09280a33
CS		 1120 if (!CvROOT(cv) && !CvXSUB(cv)) {
1121 GV* stubgv;
1122 GV* autogv;
1123
0c028dca 1124 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS		 1125 stubgv = gv;
1126 else {
1127 stubgv = CvGV(cv);
1128 if (GvCV(stubgv) != cv) /* orphaned import */
1129 stubgv = gv;
1130 }
c8416c26
BF		 1131 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1132 GvNAME(stubgv), GvNAMELEN(stubgv),
1133 GV_AUTOLOAD_ISMETHOD
1134 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1135 if (autogv)
1136 gv = autogv;
1137 }
1138 }
44a8e56a 1139
1140 return gv;
1141}
1142
1143GV*
0eeb01b9 1144Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1145{
1146 char *namepv;
1147 STRLEN namelen;
0fe84f7c 1148 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1149 namepv = SvPV(namesv, namelen);
1150 if (SvUTF8(namesv))
1151 flags |= SVf_UTF8;
0eeb01b9 1152 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1153}
1154
1155GV*
0eeb01b9 1156Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1157{
0fe84f7c 1158 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1159 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1160}
1161
1162GV*
0eeb01b9 1163Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1164{
44a8e56a 1165 GV* gv;
1166 CV* cv;
1167 HV* varstash;
1168 GV* vargv;
1169 SV* varsv;
c8416c26
BF		 1170 SV *packname = NULL;
1171 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1172
0fe84f7c 1173 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1174
7edbdc6b 1175 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1176 return NULL;
0dae17bd
GS		 1177 if (stash) {
1178 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1179 STRLEN packname_len = 0;
1180 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1181 packname = newSVpvn_flags(packname_ptr, packname_len,
1182 SVs_TEMP | SvUTF8(stash));
5c284bb0 1183 stash = NULL;
0dae17bd 1184 }
c8416c26
BF		 1185 else
1186 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1187 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1188 }
257dc59d
FC		 1189 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1190 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1191 return NULL;
dc848c6f 1192 cv = GvCV(gv);
1193
adb5a9ae 1194 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1195 return NULL;
ed850460 1196
dc848c6f 1197 /*
1198 * Inheriting AUTOLOAD for non-methods works ... for now.
1199 */
0eeb01b9
FC		 1200 if (
1201 !(flags & GV_AUTOLOAD_ISMETHOD)
1202 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1203 )
d1d15184 1204 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC		 1205 "Use of inherited AUTOLOAD for non-method %"SVf
1206 "::%"UTF8f"() is deprecated",
ecad31f0 1207 SVfARG(packname),
b17a0679 1208 UTF8fARG(is_utf8, len, name));
44a8e56a 1209
aed2304a 1210 if (CvISXSUB(cv)) {
bb619f37
FC		 1211 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1212 * and split that value on the last '::', pass along the same data
1213 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1214 *
1215 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1216 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1217 * type. Since SvPVX has been documented as returning the sub name
1218 * for a long time, but not as returning the prototype, we have
1219 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1220 * elsewhere.
1221 *
1222 * We put the prototype in the same allocated buffer, but after
1223 * the sub name. The SvPOK flag indicates the presence of a proto-
1224 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1225 * If both flags are on, then SvLEN is used to indicate the end of
1226 * the prototype (artificially lower than what is actually allo-
1227 * cated), at the risk of having to reallocate a few bytes unneces-
1228 * sarily--but that should happen very rarely, if ever.
1229 *
1230 * We use SvUTF8 for both prototypes and sub names, so if one is
1231 * UTF8, the other must be upgraded.
adb5a9ae 1232 */
c68d9564 1233 CvSTASH_set(cv, stash);
8fa6a409 1234 if (SvPOK(cv)) { /* Ouch! */
e7881358 1235 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1236 STRLEN ulen;
1237 const char *proto = CvPROTO(cv);
1238 assert(proto);
1239 if (SvUTF8(cv))
1240 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1241 ulen = SvCUR(tmpsv);
1242 SvCUR(tmpsv)++; /* include null in string */
1243 sv_catpvn_flags(
1244 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1245 );
1246 SvTEMP_on(tmpsv); /* Allow theft */
1247 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1248 SvTEMP_off(tmpsv);
e7881358 1249 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1250 SvLEN(cv) = SvCUR(cv) + 1;
1251 SvCUR(cv) = ulen;
1252 }
1253 else {
1254 sv_setpvn((SV *)cv, name, len);
1255 SvPOK_off(cv);
1256 if (is_utf8)
c8416c26 1257 SvUTF8_on(cv);
8fa6a409
FC		 1258 else SvUTF8_off(cv);
1259 }
1260 CvAUTOLOAD_on(cv);
adb5a9ae 1261 }
adb5a9ae 1262
44a8e56a 1263 /*
1264 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1265 * The subroutine's original name may not be "AUTOLOAD", so we don't
1266 * use that, but for lack of anything better we will use the sub's
1267 * original package to look up $AUTOLOAD.
1268 */
18691622 1269 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1270 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1271 ENTER;
1272
c69033f2 1273 if (!isGV(vargv)) {
04ec7e59 1274 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1275#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1276 GvSV(vargv) = newSV(0);
c69033f2
NC		 1277#endif
1278 }
3d35f11b 1279 LEAVE;
e203899d 1280 varsv = GvSVn(vargv);
4bac9ae4
CS		 1281 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1282 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1283 sv_setsv(varsv, packname);
396482e1 1284 sv_catpvs(varsv, "::");
d40bf27b
NC		 1285 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1286 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1287 sv_catpvn_flags(
1288 varsv, name, len,
5bcd1ef4 1289 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1290 );
c8416c26
BF		 1291 if (is_utf8)
1292 SvUTF8_on(varsv);
a0d0e21e
LW		 1293 return gv;
1294}
1295
44a2ac75
YO		 1296
1297/* require_tie_mod() internal routine for requiring a module
486ec47a 1298 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO		 1299 *
1300 * The "gv" parameter should be the glob.
45cbc99a
RGS		 1301 * "varpv" holds the name of the var, used for error messages.
1302 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1303 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1304 * are working reasonably close to as expected.
1305 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1306 * For the protection of $! to work (it is set by this routine)
1307 * the sv slot must already be magicalized.
d2c93421 1308 */
44a2ac75
YO		 1309STATIC HV*
1310S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1311{
da51bb9b 1312 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1313
7918f24d
NC		 1314 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1315
0ea03996 1316 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1317 SV *module = newSVsv(namesv);
1318 char varname = *varpv; /* varpv might be clobbered by load_module,
1319 so save it. For the moment it's always
1320 a single char. */
b82b06b8 1321 const char type = varname == '[' ? '$' : '%';
61bac25c 1322#ifdef DEBUGGING
d2c93421 1323 dSP;
61bac25c 1324#endif
d2c93421 1325 ENTER;
600beb2e 1326 SAVEFREESV(namesv);
44a2ac75 1327 if ( flags & 1 )
45cbc99a
RGS		 1328 save_scalar(gv);
1329 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1330 assert(sp == PL_stack_sp);
da51bb9b 1331 stash = gv_stashsv(namesv, 0);
44a2ac75 1332 if (!stash)
b82b06b8
FC		 1333 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1334 type, varname, SVfARG(namesv));
45cbc99a 1335 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1336 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1337 type, varname, SVfARG(namesv), methpv);
600beb2e 1338 LEAVE;
d2c93421 1339 }
e7881358 1340 else SvREFCNT_dec_NN(namesv);
44a2ac75 1341 return stash;
d2c93421
RH		 1342}
1343
954c1994
GS		 1344/*
1345=for apidoc gv_stashpv
1346
da51bb9b 1347Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1348determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1349
1350=cut
1351*/
1352
a0d0e21e 1353HV*
864dbfa3 1354Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1355{
7918f24d 1356 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1357 return gv_stashpvn(name, strlen(name), create);
1358}
1359
bc96cb06
SH		 1360/*
1361=for apidoc gv_stashpvn
1362
da51bb9b
NC		 1363Returns a pointer to the stash for a specified package. The C<namelen>
1364parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1365to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1366created if it does not already exist. If the package does not exist and
796b6530 1367C<flags> is 0 (or any other setting that does not create packages) then C<NULL>
da51bb9b
NC		 1368is returned.
1369
566a4718
YO		 1370Flags may be one of:
1371
1372 GV_ADD
1373 SVf_UTF8
1374 GV_NOADD_NOINIT
1375 GV_NOINIT
1376 GV_NOEXPAND
1377 GV_ADDMG
1378
796b6530 1379The most important of which are probably C<GV_ADD> and C<SVf_UTF8>.
bc96cb06 1380
808724c8 1381Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1382recommended for performance reasons.
1383
bc96cb06
SH		 1384=cut
1385*/
1386
0eadbdad
YO		 1387/*
1388gv_stashpvn_internal
1389
1390Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1391as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1392
1393*/
1394
4e7ebec5 1395PERL_STATIC_INLINE HV*
0eadbdad 1396S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1397{
0cea0058 1398 char smallbuf[128];
46fc3d4c 1399 char *tmpbuf;
a0d0e21e
LW		 1400 HV *stash;
1401 GV *tmpgv;
add0ecde 1402 U32 tmplen = namelen + 2;
dc437b57 1403
0eadbdad 1404 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1405
add0ecde 1406 if (tmplen <= sizeof smallbuf)
46fc3d4c 1407 tmpbuf = smallbuf;
1408 else
add0ecde
VP		 1409 Newx(tmpbuf, tmplen, char);
1410 Copy(name, tmpbuf, namelen, char);
1411 tmpbuf[namelen] = ':';
1412 tmpbuf[namelen+1] = ':';
1413 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1414 if (tmpbuf != smallbuf)
1415 Safefree(tmpbuf);
d2fcb1d6 1416 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1417 return NULL;
a0d0e21e 1418 stash = GvHV(tmpgv);
1f656fcf 1419 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1420 assert(stash);
1f656fcf 1421 if (!HvNAME_get(stash)) {
0be4d16f 1422 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1423
1424 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1425 /* If the containing stash has multiple effective
1426 names, see that this one gets them, too. */
1427 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1428 mro_package_moved(stash, NULL, tmpgv, 1);
1429 }
a0d0e21e 1430 return stash;
463ee0b2
LW		 1431}
1432
808724c8 1433/*
1434gv_stashsvpvn_cached
1435
1436Returns a pointer to the stash for a specified package, possibly
1437cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1438
1439Requires one of either namesv or namepv to be non-null.
1440
fbe13c60 1441See C<L</gv_stashpvn>> for details on "flags".
808724c8 1442
1443Note the sv interface is strongly preferred for performance reasons.
1444
1445*/
1446
1447#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1448 assert(namesv || name)
1449
1450PERL_STATIC_INLINE HV*
1451S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1452{
1453 HV* stash;
808724c8 1454 HE* he;
1455
1456 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1457
1458 he = (HE *)hv_common(
1459 PL_stashcache, namesv, name, namelen,
4e7ebec5 1460 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1461 );
808724c8 1462
4e7ebec5 1463 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1464 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1465
808724c8 1466 if (namesv) {
1467 if (SvOK(namesv)) { /* prevent double uninit warning */
1468 STRLEN len;
1469 name = SvPV_const(namesv, len);
1470 namelen = len;
1471 flags |= SvUTF8(namesv);
1472 } else {
1473 name = ""; namelen = 0;
1474 }
1475 }
0eadbdad
YO		 1476 stash = gv_stashpvn_internal(name, namelen, flags);
1477
4e7ebec5 1478 if (stash && namelen) {
1479 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1480 (void)hv_store(PL_stashcache, name,
4e7ebec5 1481 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1482 }
808724c8 1483
4e7ebec5 1484 return stash;
1485}
1486
808724c8 1487HV*
1488Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1489{
1490 PERL_ARGS_ASSERT_GV_STASHPVN;
1491 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1492}
1493
954c1994
GS		 1494/*
1495=for apidoc gv_stashsv
1496
fbe13c60
KW		 1497Returns a pointer to the stash for a specified package. See
1498C<L</gv_stashpvn>>.
954c1994 1499
fbe13c60
KW		 1500Note this interface is strongly preferred over C<gv_stashpvn> for performance
1501reasons.
808724c8 1502
954c1994
GS		 1503=cut
1504*/
1505
a0d0e21e 1506HV*
da51bb9b 1507Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1508{
7918f24d 1509 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1510 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW		 1511}
1512
1513
463ee0b2 1514GV *
fe9845cc 1515Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1516 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1517 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1518}
1519
1520GV *
fe9845cc 1521Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1522 STRLEN len;
77cb3b01
FC		 1523 const char * const nambeg =
1524 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1525 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1526 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1527}
1528
90aeefb4 1529PERL_STATIC_INLINE void
290a1700 1530S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1531{
1532 AV* av;
1533
1534 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1535
1536 av = GvAVn(gv);
1537 GvMULTI_on(gv);
1538 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1539 NULL, 0);
ad7cce9f
FR		 1540}
1541
90aeefb4
BF		 1542/* This function grabs name and tries to split a stash and glob
1543 * from its contents. TODO better description, comments
1544 *
1545 * If the function returns TRUE and 'name == name_end', then
1546 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1547 */
1548PERL_STATIC_INLINE bool
1549S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1550 STRLEN *len, const char *nambeg, STRLEN full_len,
1551 const U32 is_utf8, const I32 add)
1552{
1553 const char *name_cursor;
1554 const char *const name_end = nambeg + full_len;
1555 const char *const name_em1 = name_end - 1;
1556
1557 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1558
1559 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1560 /* accidental stringify on a GV? */
1561 (*name)++;
1562 }
1563
1564 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1565 if (name_cursor < name_em1 &&
1566 ((*name_cursor == ':' && name_cursor[1] == ':')
1567 || *name_cursor == '\''))
1568 {
1569 if (!*stash)
1570 *stash = PL_defstash;
1571 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1572 return FALSE;
1573
1574 *len = name_cursor - *name;
1575 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1576 const char *key;
1577 GV**gvp;
1578 if (*name_cursor == ':') {
1579 key = *name;
1580 *len += 2;
1581 }
1582 else {
1583 char *tmpbuf;
1584 Newx(tmpbuf, *len+2, char);
1585 Copy(*name, tmpbuf, *len, char);
1586 tmpbuf[(*len)++] = ':';
1587 tmpbuf[(*len)++] = ':';
1588 key = tmpbuf;
1589 }
c161da64 1590 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF		 1591 *gv = gvp ? *gvp : NULL;
1592 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1593 if (SvTYPE(*gv) != SVt_PVGV)
1594 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1595 else
1596 GvMULTI_on(*gv);
1597 }
1598 if (key != *name)
1599 Safefree(key);
1600 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1601 return FALSE;
1602
1603 if (!(*stash = GvHV(*gv))) {
1604 *stash = GvHV(*gv) = newHV();
1605 if (!HvNAME_get(*stash)) {
1606 if (GvSTASH(*gv) == PL_defstash && *len == 6
1607 && strnEQ(*name, "CORE", 4))
1608 hv_name_set(*stash, "CORE", 4, 0);
1609 else
1610 hv_name_set(
1611 *stash, nambeg, name_cursor-nambeg, is_utf8
1612 );
1613 /* If the containing stash has multiple effective
1614 names, see that this one gets them, too. */
1615 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1616 mro_package_moved(*stash, NULL, *gv, 1);
1617 }
1618 }
1619 else if (!HvNAME_get(*stash))
1620 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1621 }
1622
1623 if (*name_cursor == ':')
1624 name_cursor++;
1625 *name = name_cursor+1;
1626 if (*name == name_end) {
1627 if (!*gv)
1628 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1629 return TRUE;
1630 }
1631 }
1632 }
1633 *len = name_cursor - *name;
1634 return TRUE;
1635}
1636
536d1a88 1637/* Checks if an unqualified name is in the main stash */
90aeefb4 1638PERL_STATIC_INLINE bool
536d1a88 1639S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1640{
536d1a88 1641 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1642
90aeefb4 1643 /* If it's an alphanumeric variable */
536d1a88 1644 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF		 1645 /* Some "normal" variables are always in main::,
1646 * like INC or STDOUT.
1647 */
1648 switch (len) {
1649 case 1:
1650 if (*name == '_')
536d1a88 1651 return TRUE;
90aeefb4
BF		 1652 break;
1653 case 3:
1654 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1655 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1656 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1657 return TRUE;
90aeefb4
BF		 1658 break;
1659 case 4:
1660 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1661 && name[3] == 'V')
536d1a88 1662 return TRUE;
90aeefb4
BF		 1663 break;
1664 case 5:
1665 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1666 && name[3] == 'I' && name[4] == 'N')
536d1a88 1667 return TRUE;
90aeefb4
BF		 1668 break;
1669 case 6:
1670 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1671 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1672 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1673 return TRUE;
90aeefb4
BF		 1674 break;
1675 case 7:
1676 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1677 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1678 && name[6] == 'T')
536d1a88 1679 return TRUE;
90aeefb4
BF		 1680 break;
1681 }
536d1a88
BF		 1682 }
1683 /* *{""}, or a special variable like $@ */
1684 else
1685 return TRUE;
1686
1687 return FALSE;
1688}
1689
1690
1691/* This function is called if parse_gv_stash_name() failed to
1692 * find a stash, or if GV_NOTQUAL or an empty name was passed
1693 * to gv_fetchpvn_flags.
1694 *
1695 * It returns FALSE if the default stash can't be found nor created,
1696 * which might happen during global destruction.
1697 */
1698PERL_STATIC_INLINE bool
1699S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1700 const U32 is_utf8, const I32 add,
1701 const svtype sv_type)
1702{
1703 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1704
1705 /* No stash in name, so see how we can default */
90aeefb4 1706
536d1a88
BF		 1707 if ( gv_is_in_main(name, len, is_utf8) ) {
1708 *stash = PL_defstash;
1709 }
1710 else {
1711 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1712 *stash = PL_curstash;
1713 if (add && (PL_hints & HINT_STRICT_VARS) &&
1714 sv_type != SVt_PVCV &&
1715 sv_type != SVt_PVGV &&
1716 sv_type != SVt_PVFM &&
1717 sv_type != SVt_PVIO &&
1718 !(len == 1 && sv_type == SVt_PV &&
1719 (*name == 'a' || *name == 'b')) )
1720 {
c161da64 1721 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1722 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1723 SvTYPE(*gvp) != SVt_PVGV)
1724 {
1725 *stash = NULL;
1726 }
1727 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1728 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1729 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1730 {
1731 /* diag_listed_as: Variable "%s" is not imported%s */
1732 Perl_ck_warner_d(
1733 aTHX_ packWARN(WARN_MISC),
1734 "Variable \"%c%"UTF8f"\" is not imported",
1735 sv_type == SVt_PVAV ? '@' :
1736 sv_type == SVt_PVHV ? '%' : '$',
1737 UTF8fARG(is_utf8, len, name));
1738 if (GvCVu(*gvp))
1739 Perl_ck_warner_d(
1740 aTHX_ packWARN(WARN_MISC),
1741 "\t(Did you mean &%"UTF8f" instead?)\n",
1742 UTF8fARG(is_utf8, len, name)
1743 );
1744 *stash = NULL;
1745 }
1746 }
1747 }
1748 else {
1749 /* Use the current op's stash */
1750 *stash = CopSTASH(PL_curcop);
1751 }
1752 }
90aeefb4
BF		 1753
1754 if (!*stash) {
1755 if (add && !PL_in_clean_all) {
10860bf4
FC		 1756 GV *gv;
1757 qerror(Perl_mess(aTHX_
90aeefb4 1758 "Global symbol \"%s%"UTF8f
d8c6310a
FC		 1759 "\" requires explicit package name (did you forget to "
1760 "declare \"my %s%"UTF8f"\"?)",
1761 (sv_type == SVt_PV ? "$"
1762 : sv_type == SVt_PVAV ? "@"
1763 : sv_type == SVt_PVHV ? "%"
1764 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF		 1765 (sv_type == SVt_PV ? "$"
1766 : sv_type == SVt_PVAV ? "@"
1767 : sv_type == SVt_PVHV ? "%"
10860bf4 1768 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF		 1769 /* To maintain the output of errors after the strict exception
1770 * above, and to keep compat with older releases, rather than
1771 * placing the variables in the pad, we place
1772 * them in the <none>:: stash.
1773 */
90aeefb4
BF		 1774 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1775 if (!gv) {
1776 /* symbol table under destruction */
1777 return FALSE;
1778 }
1779 *stash = GvHV(gv);
1780 }
1781 else
1782 return FALSE;
1783 }
1784
1785 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1786 return FALSE;
1787
1788 return TRUE;
1789}
1790
8c995aba
FC		 1791/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1792 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1793 this file. */
1794#undef SvREADONLY_on
1795#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1796
930867a8
BF		 1797/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1798 * a new GV.
1799 * Note that it does not insert the GV into the stash prior to
1800 * magicalization, which some variables require need in order
1801 * to work (like $[, %+, %-, %!), so callers must take care of
1802 * that beforehand.
1803 *
1804 * The return value has a specific meaning for gv_fetchpvn_flags:
1805 * If it returns true, and the gv is empty, it indicates that its
1806 * refcount should be decreased.
1807 */
1808PERL_STATIC_INLINE bool
1809S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1810 bool addmg, const svtype sv_type)
79072805 1811{
960b831f 1812 SSize_t paren;
79072805 1813
930867a8 1814 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1815
44428a46 1816 if (stash != PL_defstash) { /* not the main stash */
ea238638 1817 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1818 and VERSION. All the others apply only to the main stash or to
1819 CORE (which is checked right after this). */
ea238638 1820 if (len) {
b464bac0 1821 const char * const name2 = name + 1;
cc4c2da6 1822 switch (*name) {
cc4c2da6
NC		 1823 case 'E':
1824 if (strnEQ(name2, "XPORT", 5))
1825 GvMULTI_on(gv);
1826 break;
1827 case 'I':
44428a46 1828 if (strEQ(name2, "SA"))
290a1700 1829 gv_magicalize_isa(gv);
cc4c2da6 1830 break;
44428a46
FC		 1831 case 'V':
1832 if (strEQ(name2, "ERSION"))
1833 GvMULTI_on(gv);
1834 break;
ea238638
FC		 1835 case 'a':
1836 case 'b':
1837 if (len == 1 && sv_type == SVt_PV)
1838 GvMULTI_on(gv);
924ba076 1839 /* FALLTHROUGH */
4aaa4757
FC		 1840 default:
1841 goto try_core;
1842 }
930867a8 1843 return addmg;
4aaa4757
FC		 1844 }
1845 try_core:
1846 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1847 /* Avoid null warning: */
1848 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1849 if (strnEQ(stashname, "CORE", 4))
1850 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1851 }
1852 }
1853 else if (len > 1) {
1854#ifndef EBCDIC
1855 if (*name > 'V' ) {
1856 NOOP;
1857 /* Nothing else to do.
1858 The compiler will probably turn the switch statement into a
1859 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1860 the common case of lower case variable names. (On EBCDIC
1861 platforms, we can't just do:
1862 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1863 because cases like '\027' in the switch statement below are
1864 C1 (non-ASCII) controls on those platforms, so the remapping
1865 would make them larger than 'V')
1866 */
44428a46
FC		 1867 } else
1868#endif
1869 {
3e669301 1870 const char * name2 = name + 1;
44428a46
FC		 1871 switch (*name) {
1872 case 'A':
1873 if (strEQ(name2, "RGV")) {
1874 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1875 }
1876 else if (strEQ(name2, "RGVOUT")) {
1877 GvMULTI_on(gv);
1878 }
1879 break;
1880 case 'E':
1881 if (strnEQ(name2, "XPORT", 5))
1882 GvMULTI_on(gv);
1883 break;
1884 case 'I':
1885 if (strEQ(name2, "SA")) {
290a1700 1886 gv_magicalize_isa(gv);
44428a46
FC		 1887 }
1888 break;
cc4c2da6
NC		 1889 case 'S':
1890 if (strEQ(name2, "IG")) {
1891 HV *hv;
1892 I32 i;
d525a7b2
NC		 1893 if (!PL_psig_name) {
1894 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1895 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1896 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1897 } else {
1898 /* I think that the only way to get here is to re-use an
1899 embedded perl interpreter, where the previous
1900 use didn't clean up fully because
1901 PL_perl_destruct_level was 0. I'm not sure that we
1902 "support" that, in that I suspect in that scenario
1903 there are sufficient other garbage values left in the
1904 interpreter structure that something else will crash
1905 before we get here. I suspect that this is one of
1906 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1907 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1908 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1909 }
1910 GvMULTI_on(gv);
1911 hv = GvHVn(gv);
a0714e2c 1912 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1913 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1914 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1915 if (init)
1916 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1917 }
1918 }
1919 break;
1920 case 'V':
1921 if (strEQ(name2, "ERSION"))
1922 GvMULTI_on(gv);
1923 break;
e5218da5
GA		 1924 case '\003': /* $^CHILD_ERROR_NATIVE */
1925 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1926 goto magicalize;
1927 break;
cc4c2da6 1928 case '\005': /* $^ENCODING */
3e669301
KW		 1929 if (*name2 == '_') {
1930 name2++;
1931 }
cc4c2da6
NC		 1932 if (strEQ(name2, "NCODING"))
1933 goto magicalize;
1934 break;
9ebf26ad
FR		 1935 case '\007': /* $^GLOBAL_PHASE */
1936 if (strEQ(name2, "LOBAL_PHASE"))
1937 goto ro_magicalize;
1938 break;
8561ea1d
FC		 1939 case '\014': /* $^LAST_FH */
1940 if (strEQ(name2, "AST_FH"))
1941 goto ro_magicalize;
1942 break;
cde0cee5 1943 case '\015': /* $^MATCH */
960b831f
NC		 1944 if (strEQ(name2, "ATCH")) {
1945 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1946 goto storeparen;
1947 }
66230c86 1948 break;
cc4c2da6
NC		 1949 case '\017': /* $^OPEN */
1950 if (strEQ(name2, "PEN"))
1951 goto magicalize;
1952 break;
cde0cee5 1953 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC		 1954 if (strEQ(name2, "REMATCH")) {
1955 paren = RX_BUFF_IDX_CARET_PREMATCH;
1956 goto storeparen;
1957 }
1958 if (strEQ(name2, "OSTMATCH")) {
1959 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1960 goto storeparen;
1961 }
9ebf26ad 1962 break;
cc4c2da6
NC		 1963 case '\024': /* ${^TAINT} */
1964 if (strEQ(name2, "AINT"))
1965 goto ro_magicalize;
1966 break;
7cebcbc0 1967 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1968 if (strEQ(name2, "NICODE"))
cc4c2da6 1969 goto ro_magicalize;
a0288114 1970 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1971 goto ro_magicalize;
e07ea26a
NC		 1972 if (strEQ(name2, "TF8CACHE"))
1973 goto magicalize;
cc4c2da6
NC		 1974 break;
1975 case '\027': /* $^WARNING_BITS */
1976 if (strEQ(name2, "ARNING_BITS"))
1977 goto magicalize;
8ca2a5d6
DD		 1978#ifdef WIN32
1979 else if (strEQ(name2, "IN32_SLOPPY_STAT"))
1980 goto magicalize;
1981#endif
cc4c2da6
NC		 1982 break;
1983 case '1':
1984 case '2':
1985 case '3':
1986 case '4':
1987 case '5':
1988 case '6':
1989 case '7':
1990 case '8':
1991 case '9':
85e6fe83 1992 {
2fdbfb4d
AB		 1993 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1994 this test */
22ff3130
HS		 1995 UV uv;
1996 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1997 return addmg;
1998 /* XXX why are we using a SSize_t? */
1999 paren = (SSize_t)(I32)uv;
960b831f 2000 goto storeparen;
1d7c1841 2001 }
dc437b57 2002 }
93a17b20 2003 }
392db708
NC		 2004 } else {
2005 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2006 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2007 switch (*name) {
6361f656 2008 case '&': /* $& */
960b831f
NC		 2009 paren = RX_BUFF_IDX_FULLMATCH;
2010 goto sawampersand;
6361f656 2011 case '`': /* $` */
960b831f
NC		 2012 paren = RX_BUFF_IDX_PREMATCH;
2013 goto sawampersand;
6361f656 2014 case '\'': /* $' */
960b831f
NC		 2015 paren = RX_BUFF_IDX_POSTMATCH;
2016 sawampersand:
1a904fc8 2017#ifdef PERL_SAWAMPERSAND
a289ef89 2018 if (!(
cc4c2da6
NC		 2019 sv_type == SVt_PVAV ||
2020 sv_type == SVt_PVHV ||
2021 sv_type == SVt_PVCV ||
2022 sv_type == SVt_PVFM ||
2023 sv_type == SVt_PVIO
d3b97530
DM		 2024 )) { PL_sawampersand |=
2025 (*name == '`')
2026 ? SAWAMPERSAND_LEFT
2027 : (*name == '&')
2028 ? SAWAMPERSAND_MIDDLE
2029 : SAWAMPERSAND_RIGHT;
2030 }
1a904fc8 2031#endif
960b831f 2032 goto storeparen;
e91d8259
NC		 2033 case '1': /* $1 */
2034 case '2': /* $2 */
2035 case '3': /* $3 */
2036 case '4': /* $4 */
2037 case '5': /* $5 */
2038 case '6': /* $6 */
2039 case '7': /* $7 */
2040 case '8': /* $8 */
2041 case '9': /* $9 */
960b831f
NC		 2042 paren = *name - '0';
2043
2044 storeparen:
e91d8259
NC		 2045 /* Flag the capture variables with a NULL mg_ptr
2046 Use mg_len for the array index to lookup. */
960b831f 2047 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2048 break;
cc4c2da6 2049
6361f656 2050 case ':': /* $: */
c69033f2 2051 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 2052 goto magicalize;
2053
6361f656 2054 case '?': /* $? */
ff0cee69 2055#ifdef COMPLEX_STATUS
c69033f2 2056 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2057#endif
cc4c2da6 2058 goto magicalize;
ff0cee69 2059
6361f656 2060 case '!': /* $! */
67261566 2061 GvMULTI_on(gv);
44a2ac75 2062 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2063
ad64d0ec 2064 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2065
44a2ac75 2066 /* magicalization must be done before require_tie_mod is called */
67261566 2067 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 2068 {
44a2ac75 2069 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 2070 addmg = FALSE;
ffdb8bcd 2071 }
d2c93421 2072
6cef1e77 2073 break;
6361f656
AB		 2074 case '-': /* $- */
2075 case '+': /* $+ */
44a2ac75
YO		 2076 GvMULTI_on(gv); /* no used once warnings here */
2077 {
44a2ac75 2078 AV* const av = GvAVn(gv);
ad64d0ec 2079 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2080
ad64d0ec
NC		 2081 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2082 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2083 if (avc)
44a2ac75 2084 SvREADONLY_on(GvSVn(gv));
44a2ac75 2085 SvREADONLY_on(av);
67261566
YO		 2086
2087 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 2088 {
192b9cd1 2089 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 2090 addmg = FALSE;
213084e4 2091 }
67261566 2092
80305961 2093 break;
cc4c2da6 2094 }
6361f656
AB		 2095 case '*': /* $* */
2096 case '#': /* $# */
9b387841 2097 if (sv_type == SVt_PV)
4f650b80 2098 /* diag_listed_as: $* is no longer supported */
9b387841 2099 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2100 "$%c is no longer supported", *name);
8ae1fe26 2101 break;
b3ca2e83
NC		 2102 case '\010': /* $^H */
2103 {
2104 HV *const hv = GvHVn(gv);
2105 hv_magic(hv, NULL, PERL_MAGIC_hints);
2106 }
2107 goto magicalize;
b82b06b8 2108 case '[': /* $[ */
7d69d4a6 2109 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2110 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 2111 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 2112 addmg = FALSE;
b82b06b8 2113 }
7d69d4a6 2114 else goto magicalize;
b82b06b8 2115 break;
cc4c2da6 2116 case '\023': /* $^S */
2fdbfb4d
AB		 2117 ro_magicalize:
2118 SvREADONLY_on(GvSVn(gv));
924ba076 2119 /* FALLTHROUGH */
6361f656 2120 case '0': /* $0 */
6361f656
AB		 2121 case '^': /* $^ */
2122 case '~': /* $~ */
2123 case '=': /* $= */
2124 case '%': /* $% */
2125 case '.': /* $. */
2126 case '(': /* $( */
2127 case ')': /* $) */
2128 case '<': /* $< */
2129 case '>': /* $> */
2130 case '\\': /* $\ */
2131 case '/': /* $/ */
4505a31f 2132 case '|': /* $| */
9cdac2a2 2133 case '$': /* $$ */
cc4c2da6
NC		 2134 case '\001': /* $^A */
2135 case '\003': /* $^C */
2136 case '\004': /* $^D */
2137 case '\005': /* $^E */
2138 case '\006': /* $^F */
cc4c2da6
NC		 2139 case '\011': /* $^I, NOT \t in EBCDIC */
2140 case '\016': /* $^N */
2141 case '\017': /* $^O */
2142 case '\020': /* $^P */
2143 case '\024': /* $^T */
2144 case '\027': /* $^W */
2145 magicalize:
ad64d0ec 2146 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2147 break;
e521374c 2148
cc4c2da6 2149 case '\014': /* $^L */
76f68e9b 2150 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2151 break;
6361f656 2152 case ';': /* $; */
76f68e9b 2153 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2154 break;
6361f656 2155 case ']': /* $] */
cc4c2da6 2156 {
3638bf15 2157 SV * const sv = GvSV(gv);
d7aa5382 2158 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2159 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2160 GvSV(gv) = vnumify(PL_patchlevel);
2161 SvREADONLY_on(GvSV(gv));
2162 SvREFCNT_dec(sv);
93a17b20
LW		 2163 }
2164 break;
cc4c2da6
NC		 2165 case '\026': /* $^V */
2166 {
3638bf15 2167 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2168 GvSV(gv) = new_version(PL_patchlevel);
2169 SvREADONLY_on(GvSV(gv));
2170 SvREFCNT_dec(sv);
16070b82
GS		 2171 }
2172 break;
ea238638
FC		 2173 case 'a':
2174 case 'b':
dc3e91f6 2175 if (sv_type == SVt_PV)
ea238638 2176 GvMULTI_on(gv);
cc4c2da6 2177 }
79072805 2178 }
930867a8
BF		 2179
2180 return addmg;
71c35c05
BF		 2181}
2182
8c995aba
FC		 2183/* If we do ever start using this later on in the file, we need to make
2184 sure we don’t accidentally use the wrong definition. */
2185#undef SvREADONLY_on
2186
070dc475
BF		 2187/* This function is called when the stash already holds the GV of the magic
2188 * variable we're looking for, but we need to check that it has the correct
2189 * kind of magic. For example, if someone first uses $! and then %!, the
2190 * latter would end up here, and we add the Errno tie to the HASH slot of
2191 * the *! glob.
2192 */
2193PERL_STATIC_INLINE void
2194S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2195{
2196 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2197
2198 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2199 if (*name == '!')
2200 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2201 else if (*name == '-' || *name == '+')
2202 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2203 } else if (sv_type == SVt_PV) {
2204 if (*name == '*' || *name == '#') {
2205 /* diag_listed_as: $* is no longer supported */
2206 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2207 WARN_SYNTAX),
2208 "$%c is no longer supported", *name);
2209 }
2210 }
2211 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2212 switch (*name) {
2213 case '[':
2214 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2215 break;
2216#ifdef PERL_SAWAMPERSAND
2217 case '`':
2218 PL_sawampersand |= SAWAMPERSAND_LEFT;
2219 (void)GvSVn(gv);
2220 break;
2221 case '&':
2222 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2223 (void)GvSVn(gv);
2224 break;
2225 case '\'':
2226 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2227 (void)GvSVn(gv);
2228 break;
2229#endif
2230 }
2231 }
2232}
2233
71c35c05
BF		 2234GV *
2235Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2236 const svtype sv_type)
2237{
71c35c05
BF		 2238 const char *name = nambeg;
2239 GV *gv = NULL;
2240 GV**gvp;
2241 STRLEN len;
2242 HV *stash = NULL;
2243 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2244 const I32 no_expand = flags & GV_NOEXPAND;
2245 const I32 add = flags & ~GV_NOADD_MASK;
2246 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2247 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2248 const char *const name_end = nambeg + full_len;
2249 U32 faking_it;
2250
2251 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2252
2253 /* If we have GV_NOTQUAL, the caller promised that
2254 * there is no stash, so we can skip the check.
2255 * Similarly if full_len is 0, since then we're
2256 * dealing with something like *{""} or ""->foo()
2257 */
2258 if ((flags & GV_NOTQUAL) || !full_len) {
2259 len = full_len;
2260 }
2261 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2262 if (name == name_end) return gv;
2263 }
2264 else {
2265 return NULL;
2266 }
2267
2268 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2269 return NULL;
2270 }
2271
2272 /* By this point we should have a stash and a name */
c161da64 2273 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2274 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2275 if (addmg) gv = (GV *)newSV(0);
2276 else return NULL;
2277 }
2278 else gv = *gvp, addmg = 0;
2279 /* From this point on, addmg means gv has not been inserted in the
2280 symtab yet. */
2281
2282 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2283 /* The GV already exists, so return it, but check if we need to do
2284 * anything else with it before that.
2285 */
71c35c05 2286 if (add) {
c002ae9a
BF		 2287 /* This is the heuristic that handles if a variable triggers the
2288 * 'used only once' warning. If there's already a GV in the stash
2289 * with this name, then we assume that the variable has been used
2290 * before and turn its MULTI flag on.
2291 * It's a heuristic because it can easily be "tricked", like with
2292 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2293 * not warning about $main::foo being used just once
2294 */
71c35c05
BF		 2295 GvMULTI_on(gv);
2296 gv_init_svtype(gv, sv_type);
2297 /* You reach this path once the typeglob has already been created,
2298 either by the same or a different sigil. If this path didn't
2299 exist, then (say) referencing $! first, and %! second would
2300 mean that %! was not handled correctly. */
2301 if (len == 1 && stash == PL_defstash) {
070dc475 2302 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2303 }
2304 else if (len == 3 && sv_type == SVt_PVAV
2305 && strnEQ(name, "ISA", 3)
2306 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2307 gv_magicalize_isa(gv);
2308 }
2309 return gv;
2310 } else if (no_init) {
2311 assert(!addmg);
2312 return gv;
c002ae9a
BF		 2313 }
2314 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2315 * don't expand it to a glob. This is an optimization so that things
2316 * copying constants over, like Exporter, don't have to be rewritten
2317 * to take into account that you can store more than just globs in
2318 * stashes.
2319 */
2320 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2321 assert(!addmg);
2322 return gv;
2323 }
2324
2325 /* Adding a new symbol.
2326 Unless of course there was already something non-GV here, in which case
2327 we want to behave as if there was always a GV here, containing some sort
2328 of subroutine.
2329 Otherwise we run the risk of creating things like GvIO, which can cause
2330 subtle bugs. eg the one that tripped up SQL::Translator */
2331
2332 faking_it = SvOK(gv);
2333
2334 if (add & GV_ADDWARN)
2335 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2336 "Had to create %"UTF8f" unexpectedly",
2337 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2338 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2339
9e5de6ae 2340 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2341 GvMULTI_on(gv) ;
2342
930867a8
BF		 2343 /* First, store the gv in the symtab if we're adding magic,
2344 * but only for non-empty GVs
2345 */
2346#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2347 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2348
2349 if ( addmg && !GvEMPTY(gv) ) {
2350 (void)hv_store(stash,name,len,(SV *)gv,0);
2351 }
2352
71c35c05 2353 /* set up magic where warranted */
930867a8
BF		 2354 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2355 /* See 23496c6 */
2356 if (GvEMPTY(gv)) {
2357 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2358 /* The GV was and still is "empty", except that now
2359 * it has the magic flags turned on, so we want it
2360 * stored in the symtab.
2361 */
2362 (void)hv_store(stash,name,len,(SV *)gv,0);
2363 }
2364 else {
2365 /* Most likely the temporary GV created above */
2366 SvREFCNT_dec_NN(gv);
2367 gv = NULL;
2368 }
2369 }
2370 }
71c35c05 2371
e6066781 2372 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2373 return gv;
79072805
LW		 2374}
2375
2376void
35a4481c 2377Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2378{
ed60a868 2379 const char *name;
35a4481c 2380 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2381
2382 PERL_ARGS_ASSERT_GV_FULLNAME4;
2383
666ea192 2384 sv_setpv(sv, prefix ? prefix : "");
a0288114 2385
52a6327b 2386 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2387 const STRLEN len = HvNAMELEN(hv);
2388 if (keepmain || strnNE(name, "main", len)) {
2389 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2390 sv_catpvs(sv,"::");
ed60a868 2391 }
43693395 2392 }
ed60a868 2393 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2394 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2395}
2396
2397void
35a4481c 2398Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2399{
099be4f1 2400 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2401
2402 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2403
46c461b5 2404 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2405}
2406
39a65960
DM		 2407
2408/* recursively scan a stash and any nested stashes looking for entries
2409 * that need the "only used once" warning raised
2410 */
2411
79072805 2412void
51da40ed 2413Perl_gv_check(pTHX_ HV *stash)
79072805 2414{
eb578fdb 2415 I32 i;
463ee0b2 2416
7918f24d
NC		 2417 PERL_ARGS_ASSERT_GV_CHECK;
2418
8990e307
LW		 2419 if (!HvARRAY(stash))
2420 return;
90754377
DM		 2421
2422 assert(SvOOK(stash));
90754377 2423
a0d0e21e 2424 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2425 const HE *entry;
90754377 2426 /* mark stash is being scanned, to avoid recursing */
339441ef 2427 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2428 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2429 GV *gv;
b7787f18 2430 HV *hv;
dc437b57 2431 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2432 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2433 {
90754377
DM		 2434 if (hv != PL_defstash && hv != stash
2435 && !(SvOOK(hv)
2436 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2437 )
a0d0e21e
LW		 2438 gv_check(hv); /* nested package */
2439 }
ecad31f0
BF		 2440 else if ( *HeKEY(entry) != '_'
2441 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2442 const char *file;
159b6efe 2443 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2444 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2445 continue;
1d7c1841 2446 file = GvFILE(gv);
1d7c1841 2447 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2448#ifdef USE_ITHREADS
2449 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2450#else
2451 CopFILEGV(PL_curcop)
2452 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2453#endif
9014280d 2454 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2455 "Name \"%"HEKf"::%"HEKf
2456 "\" used only once: possible typo",
2457 HEKfARG(HvNAME_HEK(stash)),
2458 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2459 }
79072805 2460 }
339441ef 2461 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2462 }
2463}
2464
2465GV *
9cc50d5b 2466Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2467{
9cc50d5b 2468 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2469 assert(!(flags & ~SVf_UTF8));
7918f24d 2470
b17a0679
FC		 2471 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2472 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2473 (long)PL_gensym++),
2474 GV_ADD, SVt_PVGV);
79072805
LW		 2475}
2476
2477/* hopefully this is only called on local symbol table entries */
2478
2479GP*
864dbfa3 2480Perl_gp_ref(pTHX_ GP *gp)
79072805 2481{
1d7c1841 2482 if (!gp)
d4c19fe8 2483 return NULL;
79072805 2484 gp->gp_refcnt++;
44a8e56a 2485 if (gp->gp_cv) {
2486 if (gp->gp_cvgen) {
e1a479c5
BB		 2487 /* If the GP they asked for a reference to contains
2488 a method cache entry, clear it first, so that we
2489 don't infect them with our cached entry */
e7881358 2490 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2491 gp->gp_cv = NULL;
44a8e56a 2492 gp->gp_cvgen = 0;
2493 }
44a8e56a 2494 }
79072805 2495 return gp;
79072805
LW		 2496}
2497
2498void
864dbfa3 2499Perl_gp_free(pTHX_ GV *gv)
79072805 2500{
79072805 2501 GP* gp;
b0d55c99 2502 int attempts = 100;
79072805 2503
f7877b28 2504 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2505 return;
f248d071 2506 if (gp->gp_refcnt == 0) {
9b387841
NC		 2507 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2508 "Attempt to free unreferenced glob pointers"
2509 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2510 return;
2511 }
4571f4a7 2512 if (gp->gp_refcnt > 1) {
bc81b34d 2513 borrowed:
748a9306
LW		 2514 if (gp->gp_egv == gv)
2515 gp->gp_egv = 0;
4571f4a7 2516 gp->gp_refcnt--;
c43ae56f 2517 GvGP_set(gv, NULL);
79072805 2518 return;
748a9306 2519 }
79072805 2520
b0d55c99
FC		 2521 while (1) {
2522 /* Copy and null out all the glob slots, so destructors do not see
2523 freed SVs. */
2524 HEK * const file_hek = gp->gp_file_hek;
2525 SV * const sv = gp->gp_sv;
2526 AV * const av = gp->gp_av;
2527 HV * const hv = gp->gp_hv;
2528 IO * const io = gp->gp_io;
2529 CV * const cv = gp->gp_cv;
2530 CV * const form = gp->gp_form;
2531
2532 gp->gp_file_hek = NULL;
2533 gp->gp_sv = NULL;
2534 gp->gp_av = NULL;
2535 gp->gp_hv = NULL;
2536 gp->gp_io = NULL;
2537 gp->gp_cv = NULL;
2538 gp->gp_form = NULL;
2539
2540 if (file_hek)
2541 unshare_hek(file_hek);
2542
2543 SvREFCNT_dec(sv);
2544 SvREFCNT_dec(av);
2545 /* FIXME - another reference loop GV -> symtab -> GV ?
2546 Somehow gp->gp_hv can end up pointing at freed garbage. */
2547 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2548 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC		 2549 if (PL_stashcache && hvname_hek) {
2550 DEBUG_o(Perl_deb(aTHX_
2551 "gp_free clearing PL_stashcache for '%"HEKf"'\n",
2552 HEKfARG(hvname_hek)));
0ca9877d 2553 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2554 }
b0d55c99
FC		 2555 SvREFCNT_dec(hv);
2556 }
96d7c888
FC		 2557 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2558 && (IoTYPE(io) == IoTYPE_WRONLY ||
2559 IoTYPE(io) == IoTYPE_RDWR ||
2560 IoTYPE(io) == IoTYPE_APPEND)
2561 && ckWARN_d(WARN_IO)
2562 && IoIFP(io) != PerlIO_stdin()
2563 && IoIFP(io) != PerlIO_stdout()
2564 && IoIFP(io) != PerlIO_stderr()
2565 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2566 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC		 2567 SvREFCNT_dec(io);
2568 SvREFCNT_dec(cv);
2569 SvREFCNT_dec(form);
2570
bc81b34d
FC		 2571 /* Possibly reallocated by a destructor */
2572 gp = GvGP(gv);
2573
b0d55c99
FC		 2574 if (!gp->gp_file_hek
2575 && !gp->gp_sv
2576 && !gp->gp_av
2577 && !gp->gp_hv
2578 && !gp->gp_io
2579 && !gp->gp_cv
2580 && !gp->gp_form) break;
2581
2582 if (--attempts == 0) {
2583 Perl_die(aTHX_
2584 "panic: gp_free failed to free glob pointer - "
2585 "something is repeatedly re-creating entries"
2586 );
2587 }
13207a71 2588 }
748a9306 2589
bc81b34d
FC		 2590 /* Possibly incremented by a destructor doing glob assignment */
2591 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2592 Safefree(gp);
c43ae56f 2593 GvGP_set(gv, NULL);
79072805
LW		 2594}
2595
d460ef45
NIS		 2596int
2597Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2598{
53c1dcc0
AL		 2599 AMT * const amtp = (AMT*)mg->mg_ptr;
2600 PERL_UNUSED_ARG(sv);
dd374669 2601
7918f24d
NC		 2602 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2603
d460ef45
NIS		 2604 if (amtp && AMT_AMAGIC(amtp)) {
2605 int i;
2606 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2607 CV * const cv = amtp->table[i];
b37c2d43 2608 if (cv) {
e7881358 2609 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2610 amtp->table[i] = NULL;
d460ef45
NIS		 2611 }
2612 }
2613 }
2614 return 0;
2615}
2616
a0d0e21e 2617/* Updates and caches the CV's */
c3a9a790
RGS		 2618/* Returns:
2619 * 1 on success and there is some overload
2620 * 0 if there is no overload
2621 * -1 if some error occurred and it couldn't croak
2622 */
a0d0e21e 2623
c3a9a790 2624int
242f8760 2625Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2626{
ad64d0ec 2627 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2628 AMT amt;
9b439311 2629 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2630 U32 newgen;
a0d0e21e 2631
7918f24d
NC		 2632 PERL_ARGS_ASSERT_GV_AMUPDATE;
2633
9b439311 2634 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2635 if (mg) {
2636 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2637 if (amtp->was_ok_sub == newgen) {
8c34e50d 2638 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2639 }
ad64d0ec 2640 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2641 }
a0d0e21e 2642
bfcb3514 2643 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2644
d460ef45 2645 Zero(&amt,1,AMT);
e1a479c5 2646 amt.was_ok_sub = newgen;
a6006777 2647 amt.fallback = AMGfallNO;
2648 amt.flags = 0;
2649
a6006777 2650 {
8c34e50d
FC		 2651 int filled = 0;
2652 int i;
3d147ac2
DM		 2653 bool deref_seen = 0;
2654
a6006777 2655
3866ea3b 2656 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2657
89ffc314 2658 /* Try to find via inheritance. */
e6919483 2659 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2660 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2661 CV* cv;
89ffc314
IZ		 2662
2663 if (!gv)
3866ea3b
FC		 2664 {
2665 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2666 goto no_table;
3866ea3b
FC		 2667 }
2668#ifdef PERL_DONT_CREATE_GVSV
2669 else if (!sv) {
6f207bd3 2670 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2671 }
2672#endif
79c9643d
JL		 2673 else if (SvTRUE(sv))
2674 /* don't need to set overloading here because fallback => 1
2675 * is the default setting for classes without overloading */
89ffc314 2676 amt.fallback=AMGfallYES;
79c9643d
JL		 2677 else if (SvOK(sv)) {
2678 amt.fallback=AMGfallNEVER;
386a5489 2679 filled = 1;
386a5489 2680 }
79c9643d 2681 else {
386a5489 2682 filled = 1;
386a5489 2683 }
a6006777 2684
3d147ac2 2685 assert(SvOOK(stash));
3d147ac2 2686 /* initially assume the worst */
339441ef 2687 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2688
8c34e50d 2689 for (i = 1; i < NofAMmeth; i++) {
6136c704 2690 const char * const cooky = PL_AMG_names[i];
32251b26 2691 /* Human-readable form, for debugging: */
8c34e50d 2692 const char * const cp = AMG_id2name(i);
d279ab82 2693 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2694
a0288114 2695 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2696 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2697 /* don't fill the cache while looking up!
2698 Creation of inheritance stubs in intermediate packages may
2699 conflict with the logic of runtime method substitution.
2700 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2701 then we could have created stubs for "(+0" in A and C too.
2702 But if B overloads "bool", we may want to use it for
2703 numifying instead of C's "+0". */
8c34e50d 2704 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2705 cv = 0;
c3ad4e54
FC		 2706 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2707 const HEK * const gvhek =
2708 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2709 const HEK * const stashek =
2710 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2711 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2712 && stashek && HEK_LEN(stashek) == 8
2713 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ		 2714 /* This is a hack to support autoloading..., while
2715 knowing *which* methods were declared as overloaded. */
44a8e56a 2716 /* GvSV contains the name of the method. */
6136c704 2717 GV *ngv = NULL;
c69033f2 2718 SV *gvsv = GvSV(gv);
a0288114
AL		 2719
2720 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2721 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2722 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2723 if (!gvsv || !SvPOK(gvsv)
7f415459 2724 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2725 {
a0288114 2726 /* Can be an import stub (created by "can"). */
242f8760 2727 if (destructing) {
c3a9a790 2728 return -1;
242f8760
RGS		 2729 }
2730 else {
d66cca07
BF		 2731 const SV * const name = (gvsv && SvPOK(gvsv))
2732 ? gvsv
2733 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2734 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2735 Perl_croak(aTHX_ "%s method \"%"SVf256
2736 "\" overloading \"%s\" "\
d0c0e7dd 2737 "in package \"%"HEKf256"\"",
242f8760
RGS		 2738 (GvCVGEN(gv) ? "Stub found while resolving"
2739 : "Can't resolve"),
d66cca07 2740 SVfARG(name), cp,
d0c0e7dd 2741 HEKfARG(
d66cca07 2742 HvNAME_HEK(stash)
d0c0e7dd 2743 ));
242f8760 2744 }
44a8e56a 2745 }
dc848c6f 2746 cv = GvCV(gv = ngv);
44a8e56a 2747 }
b464bac0 2748 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2749 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2750 GvNAME(CvGV(cv))) );
2751 filled = 1;
611c1e95 2752 } else if (gv) { /* Autoloaded... */
ea726b52 2753 cv = MUTABLE_CV(gv);
611c1e95 2754 filled = 1;
44a8e56a 2755 }
ea726b52 2756 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2757
2758 if (gv) {
2759 switch (i) {
2760 case to_sv_amg:
2761 case to_av_amg:
2762 case to_hv_amg:
2763 case to_gv_amg:
2764 case to_cv_amg:
2765 case nomethod_amg:
2766 deref_seen = 1;
2767 break;
2768 }
2769 }
a0d0e21e 2770 }
3d147ac2 2771 if (!deref_seen)
45479970
DM		 2772 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2773 * NB - aux var invalid here, HvARRAY() could have been
2774 * reallocated since it was assigned to */
2775 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2776
a0d0e21e 2777 if (filled) {
a6006777 2778 AMT_AMAGIC_on(&amt);
ad64d0ec 2779 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2780 (char*)&amt, sizeof(AMT));
8c34e50d 2781 return TRUE;
a0d0e21e
LW		 2782 }
2783 }
a6006777 2784 /* Here we have no table: */
8c34e50d 2785 no_table:
a6006777 2786 AMT_AMAGIC_off(&amt);
ad64d0ec 2787 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2788 (char*)&amt, sizeof(AMTS));
c3a9a790 2789 return 0;
a0d0e21e
LW		 2790}
2791
32251b26
IZ		 2792
2793CV*
2794Perl_gv_handler(pTHX_ HV *stash, I32 id)
2795{
3f8f4626 2796 MAGIC *mg;
32251b26 2797 AMT *amtp;
e1a479c5 2798 U32 newgen;
9b439311 2799 struct mro_meta* stash_meta;
32251b26 2800
bfcb3514 2801 if (!stash || !HvNAME_get(stash))
601f1833 2802 return NULL;
e1a479c5 2803
9b439311
BB		 2804 stash_meta = HvMROMETA(stash);
2805 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2806
ad64d0ec 2807 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2808 if (!mg) {
2809 do_update:
8c34e50d 2810 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2811 return NULL;
ad64d0ec 2812 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2813 }
a9fd4e40 2814 assert(mg);
32251b26 2815 amtp = (AMT*)mg->mg_ptr;
66978156 2816 if ( amtp->was_ok_sub != newgen )
32251b26 2817 goto do_update;
3ad83ce7 2818 if (AMT_AMAGIC(amtp)) {
b7787f18 2819 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2820 if (ret && isGV(ret)) { /* Autoloading stab */
2821 /* Passing it through may have resulted in a warning
2822 "Inherited AUTOLOAD for a non-method deprecated", since
2823 our caller is going through a function call, not a method call.
2824 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2825 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2826
2827 if (gv && GvCV(gv))
2828 return GvCV(gv);
2829 }
2830 return ret;
2831 }
a0288114 2832
601f1833 2833 return NULL;
32251b26
IZ		 2834}
2835
2836
6f1401dc
DM		 2837/* Implement tryAMAGICun_MG macro.
2838 Do get magic, then see if the stack arg is overloaded and if so call it.
2839 Flags:
2840 AMGf_set return the arg using SETs rather than assigning to
2841 the targ
2842 AMGf_numeric apply sv_2num to the stack arg.
2843*/
2844
2845bool
2846Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2847 dSP;
2848 SV* tmpsv;
2849 SV* const arg = TOPs;
2850
2851 SvGETMAGIC(arg);
2852
9f8bf298 2853 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC		 2854 AMGf_noright | AMGf_unary
2855 | (flags & AMGf_numarg))))
2856 {
6f1401dc
DM		 2857 if (flags & AMGf_set) {
2858 SETs(tmpsv);
2859 }
2860 else {
2861 dTARGET;
2862 if (SvPADMY(TARG)) {
2863 sv_setsv(TARG, tmpsv);
2864 SETTARG;
2865 }
2866 else
2867 SETs(tmpsv);
2868 }
2869 PUTBACK;
2870 return TRUE;
2871 }
2872
2873 if ((flags & AMGf_numeric) && SvROK(arg))
2874 *sp = sv_2num(arg);
2875 return FALSE;
2876}
2877
2878
2879/* Implement tryAMAGICbin_MG macro.
2880 Do get magic, then see if the two stack args are overloaded and if so
2881 call it.
2882 Flags:
2883 AMGf_set return the arg using SETs rather than assigning to
2884 the targ
2885 AMGf_assign op may be called as mutator (eg +=)
2886 AMGf_numeric apply sv_2num to the stack arg.
2887*/
2888
2889bool
2890Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 2891 dSP;
2892 SV* const left = TOPm1s;
2893 SV* const right = TOPs;
2894
2895 SvGETMAGIC(left);
2896 if (left != right)
2897 SvGETMAGIC(right);
2898
2899 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2900 SV * const tmpsv = amagic_call(left, right, method,
636ac8fc
FC		 2901 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0)
2902 | (flags & AMGf_numarg));
6f1401dc
DM		 2903 if (tmpsv) {
2904 if (flags & AMGf_set) {
2905 (void)POPs;
2906 SETs(tmpsv);
2907 }
2908 else {
2909 dATARGET;
2910 (void)POPs;
2911 if (opASSIGN || SvPADMY(TARG)) {
2912 sv_setsv(TARG, tmpsv);
2913 SETTARG;
2914 }
2915 else
2916 SETs(tmpsv);
2917 }
2918 PUTBACK;
2919 return TRUE;
2920 }
2921 }
75ea7a12
FC		 2922 if(left==right && SvGMAGICAL(left)) {
2923 SV * const left = sv_newmortal();
2924 *(sp-1) = left;
2925 /* Print the uninitialized warning now, so it includes the vari-
2926 able name. */
2927 if (!SvOK(right)) {
2928 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2929 sv_setsv_flags(left, &PL_sv_no, 0);
2930 }
2931 else sv_setsv_flags(left, right, 0);
2932 SvGETMAGIC(right);
2933 }
6f1401dc 2934 if (flags & AMGf_numeric) {
75ea7a12
FC		 2935 if (SvROK(TOPm1s))
2936 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2937 if (SvROK(right))
2938 *sp = sv_2num(right);
2939 }
2940 return FALSE;
2941}
2942
25a9ffce
NC		 2943SV *
2944Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2945 SV *tmpsv = NULL;
3d147ac2 2946 HV *stash;
25a9ffce
NC		 2947
2948 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2949
3d147ac2
DM		 2950 if (!SvAMAGIC(ref))
2951 return ref;
2952 /* return quickly if none of the deref ops are overloaded */
2953 stash = SvSTASH(SvRV(ref));
2954 assert(SvOOK(stash));
2955 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2956 return ref;
2957
2958 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 2959 AMGf_noright | AMGf_unary))) {
2960 if (!SvROK(tmpsv))
2961 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2962 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2963 /* Bail out if it returns us the same reference. */
2964 return tmpsv;
2965 }
2966 ref = tmpsv;
3d147ac2
DM		 2967 if (!SvAMAGIC(ref))
2968 break;
25a9ffce
NC		 2969 }
2970 return tmpsv ? tmpsv : ref;
2971}
6f1401dc 2972
8d569291
FC		 2973bool
2974Perl_amagic_is_enabled(pTHX_ int method)
2975{
2976 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2977
2978 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2979
2980 if ( !lex_mask || !SvOK(lex_mask) )
2981 /* overloading lexically disabled */
2982 return FALSE;
2983 else if ( lex_mask && SvPOK(lex_mask) ) {
2984 /* we have an entry in the hints hash, check if method has been
2985 * masked by overloading.pm */
2986 STRLEN len;
2987 const int offset = method / 8;
2988 const int bit = method % 8;
2989 char *pv = SvPV(lex_mask, len);
2990
2991 /* Bit set, so this overloading operator is disabled */
2992 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2993 return FALSE;
2994 }
2995 return TRUE;
2996}
2997
a0d0e21e 2998SV*
864dbfa3 2999Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 3000{
27da23d5 3001 dVAR;
b267980d 3002 MAGIC *mg;
9c5ffd7c 3003 CV *cv=NULL;
a0d0e21e 3004 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3005 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 3006 int off = 0, off1, lr = 0, notfound = 0;
3007 int postpr = 0, force_cpy = 0;
3008 int assign = AMGf_assign & flags;
3009 const int assignshift = assign ? 1 : 0;
bf5522a1 3010 int use_default_op = 0;
67288365 3011 int force_scalar = 0;
497b47a8
JH		 3012#ifdef DEBUGGING
3013 int fl=0;
497b47a8 3014#endif
25716404 3015 HV* stash=NULL;
7918f24d
NC		 3016
3017 PERL_ARGS_ASSERT_AMAGIC_CALL;
3018
e46c382e 3019 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3020 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 3021 }
3022
a0d0e21e 3023 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3024 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3025 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3026 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3027 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3028 : NULL))
b267980d 3029 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 3030 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3031 * usual method */
497b47a8
JH		 3032 (
3033#ifdef DEBUGGING
3034 fl = 1,
a0288114 3035#endif
497b47a8 3036 cv = cvp[off=method])))) {
a0d0e21e
LW		 3037 lr = -1; /* Call method for left argument */
3038 } else {
3039 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3040 int logic;
3041
3042 /* look for substituted methods */
ee239bfe 3043 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 3044 switch (method) {
3045 case inc_amg:
ee239bfe
IZ		 3046 force_cpy = 1;
3047 if ((cv = cvp[off=add_ass_amg])
3048 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3049 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3050 }
3051 break;
3052 case dec_amg:
ee239bfe
IZ		 3053 force_cpy = 1;
3054 if ((cv = cvp[off = subtr_ass_amg])
3055 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3056 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3057 }
3058 break;
3059 case bool__amg:
3060 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3061 break;
3062 case numer_amg:
3063 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3064 break;
3065 case string_amg:
3066 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3067 break;
b7787f18
AL		 3068 case not_amg:
3069 (void)((cv = cvp[off=bool__amg])
3070 || (cv = cvp[off=numer_amg])
3071 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 3072 if (cv)
3073 postpr = 1;
b7787f18 3074 break;
748a9306
LW		 3075 case copy_amg:
3076 {
76e3520e
GS		 3077 /*
3078 * SV* ref causes confusion with the interpreter variable of
3079 * the same name
3080 */
890ce7af 3081 SV* const tmpRef=SvRV(left);
76e3520e 3082 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 3083 /*
3084 * Just to be extra cautious. Maybe in some
3085 * additional cases sv_setsv is safe, too.
3086 */
890ce7af 3087 SV* const newref = newSVsv(tmpRef);
748a9306 3088 SvOBJECT_on(newref);
a1cd65be
FC		 3089 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3090 delegate to the stash. */
85fbaab2 3091 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 3092 return newref;
3093 }
3094 }
3095 break;
a0d0e21e 3096 case abs_amg:
b267980d 3097 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3098 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3099 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3100 if (off1==lt_amg) {
890ce7af 3101 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3102 lt_amg,AMGf_noright);
3103 logic = SvTRUE(lessp);
3104 } else {
890ce7af 3105 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3106 ncmp_amg,AMGf_noright);
3107 logic = (SvNV(lessp) < 0);
3108 }
3109 if (logic) {
3110 if (off==subtr_amg) {
3111 right = left;
748a9306 3112 left = nullsv;
a0d0e21e
LW		 3113 lr = 1;
3114 }
3115 } else {
3116 return left;
3117 }
3118 }
3119 break;
3120 case neg_amg:
155aba94 3121 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 3122 right = left;
3123 left = sv_2mortal(newSViv(0));
3124 lr = 1;
3125 }
3126 break;
f216259d 3127 case int_amg:
f5284f61 3128 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3129 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3130 case regexp_amg:
b267980d
NIS		 3131 /* FAIL safe */
3132 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3133
f5284f61
IZ		 3134 case to_sv_amg:
3135 case to_av_amg:
3136 case to_hv_amg:
3137 case to_gv_amg:
3138 case to_cv_amg:
3139 /* FAIL safe */
b267980d 3140 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3141
a0d0e21e
LW		 3142 default:
3143 goto not_found;
3144 }
3145 if (!cv) goto not_found;
3146 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3147 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3148 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3149 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3150 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3151 : NULL))
69815d08
RS		 3152 && (cv = cvp[off=method])) { /* Method for right
3153 * argument found */
3154 lr=1;
bf5522a1
MB		 3155 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3156 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 3157 && !(flags & AMGf_unary)) {
3158 /* We look for substitution for
3159 * comparison operations and
fc36a67e 3160 * concatenation */
a0d0e21e
LW		 3161 if (method==concat_amg || method==concat_ass_amg
3162 || method==repeat_amg || method==repeat_ass_amg) {
3163 return NULL; /* Delegate operation to string conversion */
3164 }
3165 off = -1;
3166 switch (method) {
3167 case lt_amg:
3168 case le_amg:
3169 case gt_amg:
3170 case ge_amg:
3171 case eq_amg:
3172 case ne_amg:
2ab54efd
MB		 3173 off = ncmp_amg;
3174 break;
a0d0e21e
LW		 3175 case slt_amg:
3176 case sle_amg:
3177 case sgt_amg:
3178 case sge_amg:
3179 case seq_amg:
3180 case sne_amg:
2ab54efd
MB		 3181 off = scmp_amg;
3182 break;
a0d0e21e 3183 }
bf5522a1
MB		 3184 if (off != -1) {
3185 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3186 cv = ocvp[off];
3187 lr = -1;
3188 }
3189 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3190 cv = cvp[off];
3191 lr = 1;
3192 }
3193 }
3194 if (cv)
2ab54efd
MB		 3195 postpr = 1;
3196 else
3197 goto not_found;
a0d0e21e 3198 } else {
a6006777 3199 not_found: /* No method found, either report or croak */
b267980d
NIS		 3200 switch (method) {
3201 case to_sv_amg:
3202 case to_av_amg:
3203 case to_hv_amg:
3204 case to_gv_amg:
3205 case to_cv_amg:
3206 /* FAIL safe */
3207 return left; /* Delegate operation to standard mechanisms. */
b267980d 3208 }
a0d0e21e
LW		 3209 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3210 notfound = 1; lr = -1;
3211 } else if (cvp && (cv=cvp[nomethod_amg])) {
3212 notfound = 1; lr = 1;
bf5522a1
MB		 3213 } else if ((use_default_op =
3214 (!ocvp || oamtp->fallback >= AMGfallYES)
3215 && (!cvp || amtp->fallback >= AMGfallYES))
3216 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3217 /* Skip generating the "no method found" message. */
3218 return NULL;
a0d0e21e 3219 } else {
46fc3d4c 3220 SV *msg;
774d564b 3221 if (off==-1) off=method;
b267980d 3222 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3223 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3224 AMG_id2name(method + assignshift),
3225 (flags & AMGf_unary ? " " : "\n\tleft "),
3226 SvAMAGIC(left)?
3227 "in overloaded package ":
3228 "has no overloaded magic",
3229 SvAMAGIC(left)?
3230 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3231 SVfARG(&PL_sv_no),
3232 SvAMAGIC(right)?
3233 ",\n\tright argument in overloaded package ":
3234 (flags & AMGf_unary
3235 ? ""
3236 : ",\n\tright argument has no overloaded magic"),
3237 SvAMAGIC(right)?
3238 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3239 SVfARG(&PL_sv_no)));
bf5522a1 3240 if (use_default_op) {
d66cca07 3241 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3242 } else {
be2597df 3243 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3244 }
3245 return NULL;
3246 }
ee239bfe 3247 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3248 }
3249 }
67288365
JL		 3250
3251 switch (method) {
3252 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3253 * operation. we need this to return a value, so that it can be assigned
3254 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3255 * increment or decrement was itself called in void context */
3256 case inc_amg:
3257 if (off == add_amg)
3258 force_scalar = 1;
3259 break;
3260 case dec_amg:
3261 if (off == subtr_amg)
3262 force_scalar = 1;
3263 break;
3264 /* in these cases, we're calling an assignment variant of an operator
3265 * (+= rather than +, for instance). regardless of whether it's a
3266 * fallback or not, it always has to return a value, which will be
3267 * assigned to the proper variable later */
3268 case add_amg:
3269 case subtr_amg:
3270 case mult_amg:
3271 case div_amg:
3272 case modulo_amg:
3273 case pow_amg:
3274 case lshift_amg:
3275 case rshift_amg:
3276 case repeat_amg:
3277 case concat_amg:
3278 case band_amg:
3279 case bor_amg:
3280 case bxor_amg:
6d06ecce
FC		 3281 case sband_amg:
3282 case sbor_amg:
3283 case sbxor_amg:
67288365
JL		 3284 if (assign)
3285 force_scalar = 1;
3286 break;
3287 /* the copy constructor always needs to return a value */
3288 case copy_amg:
3289 force_scalar = 1;
3290 break;
3291 /* because of the way these are implemented (they don't perform the
3292 * dereferencing themselves, they return a reference that perl then
3293 * dereferences later), they always have to be in scalar context */
3294 case to_sv_amg:
3295 case to_av_amg:
3296 case to_hv_amg:
3297 case to_gv_amg:
3298 case to_cv_amg:
3299 force_scalar = 1;
3300 break;
3301 /* these don't have an op of their own; they're triggered by their parent
3302 * op, so the context there isn't meaningful ('$a and foo()' in void
3303 * context still needs to pass scalar context on to $a's bool overload) */
3304 case bool__amg:
3305 case numer_amg:
3306 case string_amg:
3307 force_scalar = 1;
3308 break;
3309 }
3310
497b47a8 3311#ifdef DEBUGGING
a0d0e21e 3312 if (!notfound) {
497b47a8 3313 DEBUG_o(Perl_deb(aTHX_
d66cca07 3314 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3315 AMG_id2name(off),
3316 method+assignshift==off? "" :
a0288114 3317 " (initially \"",
497b47a8
JH		 3318 method+assignshift==off? "" :
3319 AMG_id2name(method+assignshift),
a0288114 3320 method+assignshift==off? "" : "\")",
497b47a8
JH		 3321 flags & AMGf_unary? "" :
3322 lr==1 ? " for right argument": " for left argument",
3323 flags & AMGf_unary? " for argument" : "",
d66cca07 3324 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3325 fl? ",\n\tassignment variant used": "") );
ee239bfe 3326 }
497b47a8 3327#endif
748a9306
LW		 3328 /* Since we use shallow copy during assignment, we need
3329 * to dublicate the contents, probably calling user-supplied
3330 * version of copy operator
3331 */
ee239bfe
IZ		 3332 /* We need to copy in following cases:
3333 * a) Assignment form was called.
3334 * assignshift==1, assign==T, method + 1 == off
3335 * b) Increment or decrement, called directly.
3336 * assignshift==0, assign==0, method + 0 == off
3337 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3338 * assignshift==0, assign==T,
ee239bfe
IZ		 3339 * force_cpy == T
3340 * d) Increment or decrement, translated to nomethod.
b267980d 3341 * assignshift==0, assign==0,
ee239bfe
IZ		 3342 * force_cpy == T
3343 * e) Assignment form translated to nomethod.
3344 * assignshift==1, assign==T, method + 1 != off
3345 * force_cpy == T
3346 */
3347 /* off is method, method+assignshift, or a result of opcode substitution.
3348 * In the latter case assignshift==0, so only notfound case is important.
3349 */
73512201 3350 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3351 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3352 || force_cpy) )
6f1401dc 3353 {
1b38c28e
NC		 3354 /* newSVsv does not behave as advertised, so we copy missing
3355 * information by hand */
3356 SV *tmpRef = SvRV(left);
3357 SV *rv_copy;
31d632c3 3358 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3359 SvRV_set(left, rv_copy);
3360 SvSETMAGIC(left);
e7881358 3361 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3362 }
6f1401dc
DM		 3363 }
3364
a0d0e21e
LW		 3365 {
3366 dSP;
3367 BINOP myop;
3368 SV* res;
b7787f18 3369 const bool oldcatch = CATCH_GET;
67288365
JL		 3370 I32 oldmark, nret;
3371 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3372
54310121 3373 CATCH_SET(TRUE);
a0d0e21e
LW		 3374 Zero(&myop, 1, BINOP);
3375 myop.op_last = (OP *) &myop;
b37c2d43 3376 myop.op_next = NULL;
67288365
JL		 3377 myop.op_flags = OPf_STACKED;
3378
3379 switch (gimme) {
3380 case G_VOID:
3381 myop.op_flags |= OPf_WANT_VOID;
3382 break;
3383 case G_ARRAY:
3384 if (flags & AMGf_want_list) {
3385 myop.op_flags |= OPf_WANT_LIST;
3386 break;
3387 }
3388 /* FALLTHROUGH */
3389 default:
3390 myop.op_flags |= OPf_WANT_SCALAR;
3391 break;
3392 }
a0d0e21e 3393
e788e7d3 3394 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3395 ENTER;
462e5cf6 3396 SAVEOP();
533c011a 3397 PL_op = (OP *) &myop;
3280af22 3398 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3399 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3400 Perl_pp_pushmark(aTHX);
a0d0e21e 3401
924508f0 3402 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3403 PUSHs(lr>0? right: left);
3404 PUSHs(lr>0? left: right);
3280af22 3405 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3406 if (notfound) {
59cd0e26
NC		 3407 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3408 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3409 }
636ac8fc
FC		 3410 else if (flags & AMGf_numarg)
3411 PUSHs(&PL_sv_undef);
3412 if (flags & AMGf_numarg)
3413 PUSHs(&PL_sv_yes);
ad64d0ec 3414 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3415 PUTBACK;
67288365 3416 oldmark = TOPMARK;
a0d0e21e 3417
139d0ce6 3418 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3419 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3420 LEAVE;
3421 SPAGAIN;
67288365
JL		 3422 nret = SP - (PL_stack_base + oldmark);
3423
3424 switch (gimme) {
3425 case G_VOID:
3426 /* returning NULL has another meaning, and we check the context
3427 * at the call site too, so this can be differentiated from the
3428 * scalar case */
3429 res = &PL_sv_undef;
3430 SP = PL_stack_base + oldmark;
3431 break;
3432 case G_ARRAY: {
3433 if (flags & AMGf_want_list) {
3434 res = sv_2mortal((SV *)newAV());
3435 av_extend((AV *)res, nret);
3436 while (nret--)
3437 av_store((AV *)res, nret, POPs);
3438 break;
3439 }
3440 /* FALLTHROUGH */
3441 }
3442 default:
3443 res = POPs;
3444 break;
3445 }
a0d0e21e 3446
ebafeae7 3447 PUTBACK;
d3acc0f7 3448 POPSTACK;
54310121 3449 CATCH_SET(oldcatch);
a0d0e21e 3450
a0d0e21e 3451 if (postpr) {
b7787f18 3452 int ans;
a0d0e21e
LW		 3453 switch (method) {
3454 case le_amg:
3455 case sle_amg:
3456 ans=SvIV(res)<=0; break;
3457 case lt_amg:
3458 case slt_amg:
3459 ans=SvIV(res)<0; break;
3460 case ge_amg:
3461 case sge_amg:
3462 ans=SvIV(res)>=0; break;
3463 case gt_amg:
3464 case sgt_amg:
3465 ans=SvIV(res)>0; break;
3466 case eq_amg:
3467 case seq_amg:
3468 ans=SvIV(res)==0; break;
3469 case ne_amg:
3470 case sne_amg:
3471 ans=SvIV(res)!=0; break;
3472 case inc_amg:
3473 case dec_amg:
bbce6d69 3474 SvSetSV(left,res); return left;
dc437b57 3475 case not_amg:
fe7ac86a 3476 ans=!SvTRUE(res); break;
b7787f18
AL		 3477 default:
3478 ans=0; break;
a0d0e21e 3479 }
54310121 3480 return boolSV(ans);
748a9306
LW		 3481 } else if (method==copy_amg) {
3482 if (!SvROK(res)) {
cea2e8a9 3483 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3484 }
3485 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3486 } else {
3487 return res;
3488 }
3489 }
3490}
c9d5ac95 3491
f5c1e807
NC		 3492void
3493Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3494{
3495 dVAR;
acda4c6a 3496 U32 hash;
f5c1e807 3497
7918f24d 3498 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3499
acda4c6a
NC		 3500 if (len > I32_MAX)
3501 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3502
ae8cc45f
NC		 3503 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3504 unshare_hek(GvNAME_HEK(gv));
3505 }
3506
acda4c6a 3507 PERL_HASH(hash, name, len);
c60dbbc3 3508 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3509}
3510
66610fdd 3511/*
f7461760
Z		 3512=for apidoc gv_try_downgrade
3513
2867cdbc
Z		 3514If the typeglob C<gv> can be expressed more succinctly, by having
3515something other than a real GV in its place in the stash, replace it
3516with the optimised form. Basic requirements for this are that C<gv>
3517is a real typeglob, is sufficiently ordinary, and is only referenced
3518from its package. This function is meant to be used when a GV has been
3519looked up in part to see what was there, causing upgrading, but based
3520on what was found it turns out that the real GV isn't required after all.
3521
3522If C<gv> is a completely empty typeglob, it is deleted from the stash.
3523
3524If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3525sub, the typeglob is replaced with a scalar-reference placeholder that
3526more compactly represents the same thing.
f7461760
Z		 3527
3528=cut
3529*/
3530
3531void
3532Perl_gv_try_downgrade(pTHX_ GV *gv)
3533{
3534 HV *stash;
3535 CV *cv;
3536 HEK *namehek;
3537 SV **gvp;
3538 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3539
3540 /* XXX Why and where does this leave dangling pointers during global
3541 destruction? */
627364f1 3542 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3543
2867cdbc 3544 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3545 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3546 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3547 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3548 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3549 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3550 return;
2be08ad1
FC		 3551 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3552 return;
803f2748
DM		 3553 if (SvMAGICAL(gv)) {
3554 MAGIC *mg;
3555 /* only backref magic is allowed */
3556 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3557 return;
3558 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3559 if (mg->mg_type != PERL_MAGIC_backref)
3560 return;
3561 }
3562 }
2867cdbc
Z		 3563 cv = GvCV(gv);
3564 if (!cv) {
3565 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3566 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3567 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3568 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3569 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z		 3570 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3571 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3572 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3573 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3574 *gvp == (SV*)gv) {
3575 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3576 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3577 SvREFCNT(gv) = 0;
3578 sv_clear((SV*)gv);
3579 SvREFCNT(gv) = 1;
70e5f2b5 3580 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH		 3581
3582 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z		 3583 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3584 STRUCT_OFFSET(XPVIV, xiv_iv));
3585 SvRV_set(gv, value);
3586 }
3587}
3588
9e3fb20c
FC		 3589GV *
3590Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3591{
3592 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3593 GV * const *gvp;
3594 PERL_ARGS_ASSERT_GV_OVERRIDE;
3595 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3596 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3597 gv = gvp ? *gvp : NULL;
3598 if (gv && !isGV(gv)) {
3599 if (!SvPCS_IMPORTED(gv)) return NULL;
3600 gv_init(gv, PL_globalstash, name, len, 0);
3601 return gv;
3602 }
3603 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3604}
3605
4aaa4757
FC		 3606#include "XSUB.h"
3607
3608static void
3609core_xsub(pTHX_ CV* cv)
3610{
3611 Perl_croak(aTHX_
3612 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3613 );
3614}
3615
f7461760 3616/*
14d04a33 3617 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3618 */
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