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Change \p{foo} to mean \p{scx: foo}
[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));
4bbde2f7 388 break;
81d52ecd 389
42d0e0b7 390 default: NOOP;
5c1f4d79 391 }
756cb477
NC		 392 SvRV_set(gv, NULL);
393 SvROK_off(gv);
394 }
463ee0b2 395
3b6733bf
NC		 396
397 if (old_type < SVt_PVGV) {
398 if (old_type >= SVt_PV)
399 SvCUR_set(gv, 0);
ad64d0ec 400 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 401 }
55d729e4
GS		 402 if (SvLEN(gv)) {
403 if (proto) {
f880fe2f 404 SvPV_set(gv, NULL);
b162af07 405 SvLEN_set(gv, 0);
55d729e4
GS		 406 SvPOK_off(gv);
407 } else
94010e71 408 Safefree(SvPVX_mutable(gv));
55d729e4 409 }
2e5b91de
NC		 410 SvIOK_off(gv);
411 isGV_with_GP_on(gv);
12816592 412
c43ae56f 413 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC		 414 GvSTASH(gv) = stash;
415 if (stash)
ad64d0ec 416 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 417 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 418 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
419 GvMULTI_on(gv); /* _was_ mentioned */
2eaf799e
FC		 420 if (has_constant && SvTYPE(has_constant) == SVt_PVCV) {
421 /* Not actually a constant. Just a regular sub. */
422 CV * const cv = (CV *)has_constant;
423 GvCV_set(gv,cv);
424 if (CvSTASH(cv) == stash && (
425 CvNAME_HEK(cv) == GvNAME_HEK(gv)
426 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
427 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
428 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
429 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
430 )
431 ))
432 CvGV_set(cv,gv);
433 }
434 else if (doproto) {
e3d2b9e7 435 CV *cv;
756cb477
NC		 436 if (has_constant) {
437 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 438 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 439 /* In case op.c:S_process_special_blocks stole it: */
440 if (!GvCV(gv))
c43ae56f 441 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 442 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 443 /* If this reference was a copy of another, then the subroutine
444 must have been "imported", by a Perl space assignment to a GV
445 from a reference to CV. */
446 if (exported_constant)
447 GvIMPORTED_CV_on(gv);
186a5ba8 448 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 449 } else {
186a5ba8 450 cv = newSTUB(gv,1);
756cb477 451 }
55d729e4 452 if (proto) {
e3d2b9e7 453 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 454 SV_HAS_TRAILING_NUL);
e0260a5b 455 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 456 }
457 }
463ee0b2
LW		 458}
459
76e3520e 460STATIC void
e6066781 461S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 462{
13c59d41
MH		 463 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
464
465 switch (sv_type) {
466 case SVt_PVIO:
467 (void)GvIOn(gv);
468 break;
469 case SVt_PVAV:
470 (void)GvAVn(gv);
471 break;
472 case SVt_PVHV:
473 (void)GvHVn(gv);
474 break;
c69033f2 475#ifdef PERL_DONT_CREATE_GVSV
13c59d41
MH		 476 case SVt_NULL:
477 case SVt_PVCV:
478 case SVt_PVFM:
479 case SVt_PVGV:
480 break;
481 default:
482 if(GvSVn(gv)) {
483 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
484 If we just cast GvSVn(gv) to void, it ignores evaluating it for
485 its side effect */
486 }
c69033f2 487#endif
a0d0e21e
LW		 488 }
489}
490
0f8d4b5e
FC		 491static void core_xsub(pTHX_ CV* cv);
492
493static GV *
494S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 495 const char * const name, const STRLEN len)
0f8d4b5e
FC		 496{
497 const int code = keyword(name, len, 1);
498 static const char file[] = __FILE__;
97021f77 499 CV *cv, *oldcompcv = NULL;
0f8d4b5e 500 int opnum = 0;
0f8d4b5e 501 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 502 COP *oldcurcop = NULL;
503 yy_parser *oldparser = NULL;
504 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 505
506 assert(gv || stash);
507 assert(name);
0f8d4b5e 508
88b892d8
FC		 509 if (!code) return NULL; /* Not a keyword */
510 switch (code < 0 ? -code : code) {
0f8d4b5e 511 /* no support for \&CORE::infix;
d885f758 512 no support for funcs that do not parse like funcs */
88b892d8 513 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 514 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 515 case KEY_default : case KEY_DESTROY:
88b892d8 516 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 517 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 518 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 519 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC		 520 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
521 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
522 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 523 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 524 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 525 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 526 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 527 case KEY_state: case KEY_sub :
46bef06f 528 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC		 529 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
530 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 531 return NULL;
532 case KEY_chdir:
eb31eb35 533 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
73665bc4 534 case KEY_eof : case KEY_exec: case KEY_exists :
0f8d4b5e 535 case KEY_lstat:
bea284c8 536 case KEY_split:
0f8d4b5e
FC		 537 case KEY_stat:
538 case KEY_system:
539 case KEY_truncate: case KEY_unlink:
0f8d4b5e
FC		 540 ampable = FALSE;
541 }
542 if (!gv) {
543 gv = (GV *)newSV(0);
544 gv_init(gv, stash, name, len, TRUE);
545 }
7e68c38b 546 GvMULTI_on(gv);
0f8d4b5e
FC		 547 if (ampable) {
548 ENTER;
549 oldcurcop = PL_curcop;
550 oldparser = PL_parser;
551 lex_start(NULL, NULL, 0);
552 oldcompcv = PL_compcv;
553 PL_compcv = NULL; /* Prevent start_subparse from setting
554 CvOUTSIDE. */
555 oldsavestack_ix = start_subparse(FALSE,0);
556 cv = PL_compcv;
557 }
558 else {
559 /* Avoid calling newXS, as it calls us, and things start to
560 get hairy. */
561 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
562 GvCV_set(gv,cv);
563 GvCVGEN(gv) = 0;
0f8d4b5e
FC		 564 CvISXSUB_on(cv);
565 CvXSUB(cv) = core_xsub;
eacbb379 566 PoisonPADLIST(cv);
0f8d4b5e
FC		 567 }
568 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
569 from PL_curcop. */
9b669ea1
DD		 570 /* XSUBs can't be perl lang/perl5db.pl debugged
571 if (PERLDB_LINE_OR_SAVESRC)
572 (void)gv_fetchfile(file); */
0f8d4b5e
FC		 573 CvFILE(cv) = (char *)file;
574 /* XXX This is inefficient, as doing things this order causes
575 a prototype check in newATTRSUB. But we have to do
576 it this order as we need an op number before calling
577 new ATTRSUB. */
578 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 579 if (stash)
73c02f15 580 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 581 if (ampable) {
4428fb0e
TC		 582#ifdef DEBUGGING
583 CV *orig_cv = cv;
584#endif
0f8d4b5e 585 CvLVALUE_on(cv);
4428fb0e
TC		 586 /* newATTRSUB will free the CV and return NULL if we're still
587 compiling after a syntax error */
e8f91c91 588 if ((cv = newATTRSUB_x(
7e68c38b 589 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 590 NULL,NULL,
591 coresub_op(
592 opnum
593 ? newSVuv((UV)opnum)
594 : newSVpvn(name,len),
595 code, opnum
7e68c38b 596 ),
e8f91c91 597 TRUE
4428fb0e
TC		 598 )) != NULL) {
599 assert(GvCV(gv) == orig_cv);
600 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
cd642408 601 && opnum != OP_UNDEF && opnum != OP_KEYS)
4428fb0e
TC		 602 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
603 }
0f8d4b5e
FC		 604 LEAVE;
605 PL_parser = oldparser;
606 PL_curcop = oldcurcop;
607 PL_compcv = oldcompcv;
608 }
4428fb0e
TC		 609 if (cv) {
610 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
611 cv_set_call_checker(
612 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
613 );
614 SvREFCNT_dec(opnumsv);
615 }
616
0f8d4b5e
FC		 617 return gv;
618}
619
954c1994 620/*
6c53d59b
FC		 621=for apidoc gv_fetchmeth
622
623Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
624
e6919483
BF		 625=for apidoc gv_fetchmeth_sv
626
627Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
628of an SV instead of a string/length pair.
629
630=cut
631*/
632
633GV *
634Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
635{
c290e187 636 char *namepv;
637 STRLEN namelen;
638 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
639 if (LIKELY(SvPOK_nog(namesv))) /* common case */
640 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, flags);
641 namepv = SvPV(namesv, namelen);
642 if (SvUTF8(namesv)) flags |= SVf_UTF8;
643 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF		 644}
645
646/*
647=for apidoc gv_fetchmeth_pv
648
649Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
650instead of a string/length pair.
651
652=cut
653*/
654
655GV *
656Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
657{
658 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 659 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF		 660}
661
662/*
663=for apidoc gv_fetchmeth_pvn
954c1994
GS		 664
665Returns the glob with the given C<name> and a defined subroutine or
666C<NULL>. The glob lives in the given C<stash>, or in the stashes
796b6530 667accessible via C<@ISA> and C<UNIVERSAL::>.
954c1994
GS		 668
669The argument C<level> should be either 0 or -1. If C<level==0>, as a
670side-effect creates a glob with the given C<name> in the given C<stash>
671which in the case of success contains an alias for the subroutine, and sets
e1a479c5 672up caching info for this glob.
954c1994 673
796b6530 674The only significant values for C<flags> are C<GV_SUPER> and C<SVf_UTF8>.
aae43805 675
796b6530 676C<GV_SUPER> indicates that we want to look up the method in the superclasses
aae43805 677of the C<stash>.
e6919483 678
aae43805 679The
954c1994 680GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 681visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 682the GV directly; instead, you should use the method's CV, which can be
b267980d 683obtained from the GV with the C<GvCV> macro.
954c1994
GS		 684
685=cut
686*/
687
e1a479c5
BB		 688/* NOTE: No support for tied ISA */
689
c6afe666 690PERL_STATIC_INLINE GV*
691S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 692{
463ee0b2 693 GV** gvp;
c6afe666 694 HE* he;
e1a479c5
BB		 695 AV* linear_av;
696 SV** linear_svp;
697 SV* linear_sv;
aae43805 698 HV* cstash, *cachestash;
e1a479c5
BB		 699 GV* candidate = NULL;
700 CV* cand_cv = NULL;
e1a479c5 701 GV* topgv = NULL;
bfcb3514 702 const char *hvname;
c6afe666 703 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 704 I32 items;
e1a479c5 705 U32 topgen_cmp;
04f3bf56 706 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 707
af09ea45
IK		 708 /* UNIVERSAL methods should be callable without a stash */
709 if (!stash) {
e1a479c5 710 create = 0; /* probably appropriate */
da51bb9b 711 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 712 return 0;
713 }
714
e1a479c5
BB		 715 assert(stash);
716
bfcb3514
NC		 717 hvname = HvNAME_get(stash);
718 if (!hvname)
e1a479c5 719 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 720
e1a479c5 721 assert(hvname);
55df6700 722 assert(name || meth);
463ee0b2 723
aae43805 724 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC		 725 flags & GV_SUPER ? "SUPER " : "",
726 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 727
dd69841b 728 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 729
aae43805 730 if (flags & GV_SUPER) {
1a33a059
FC		 731 if (!HvAUX(stash)->xhv_mro_meta->super)
732 HvAUX(stash)->xhv_mro_meta->super = newHV();
733 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC		 734 }
735 else cachestash = stash;
736
e1a479c5 737 /* check locally for a real method or a cache entry */
c6afe666 738 he = (HE*)hv_common(
739 cachestash, meth, name, len, (flags & SVf_UTF8) ? HVhek_UTF8 : 0, create, NULL, 0
740 );
741 if (he) gvp = (GV**)&HeVAL(he);
742 else gvp = NULL;
743
e1a479c5
BB		 744 if(gvp) {
745 topgv = *gvp;
0f8d4b5e 746 have_gv:
e1a479c5
BB		 747 assert(topgv);
748 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC		 749 {
750 if (!name)
751 name = SvPV_nomg(meth, len);
04ec7e59 752 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 753 }
e1a479c5
BB		 754 if ((cand_cv = GvCV(topgv))) {
755 /* If genuine method or valid cache entry, use it */
756 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
757 return topgv;
758 }
759 else {
760 /* stale cache entry, junk it and move on */
e7881358 761 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 762 GvCV_set(topgv, NULL);
763 cand_cv = NULL;
e1a479c5
BB		 764 GvCVGEN(topgv) = 0;
765 }
766 }
767 else if (GvCVGEN(topgv) == topgen_cmp) {
768 /* cache indicates no such method definitively */
769 return 0;
770 }
aae43805
FC		 771 else if (stash == cachestash
772 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 773 && strnEQ(hvname, "CORE", 4)
87566176 774 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 775 goto have_gv;
463ee0b2 776 }
79072805 777
aae43805 778 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 779 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
780 items = AvFILLp(linear_av); /* no +1, to skip over self */
781 while (items--) {
782 linear_sv = *linear_svp++;
783 assert(linear_sv);
784 cstash = gv_stashsv(linear_sv, 0);
785
dd69841b 786 if (!cstash) {
ecad31f0 787 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 788 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 789 SVfARG(linear_sv),
d0c0e7dd 790 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 791 continue;
792 }
9607fc9c 793
e1a479c5
BB		 794 assert(cstash);
795
c60dbbc3 796 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 797 if (!gvp) {
798 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
799 const char *hvname = HvNAME(cstash); assert(hvname);
800 if (strnEQ(hvname, "CORE", 4)
801 && (candidate =
87566176 802 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 803 ))
804 goto have_candidate;
805 }
806 continue;
807 }
808 else candidate = *gvp;
809 have_candidate:
e1a479c5 810 assert(candidate);
04f3bf56 811 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 812 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 813 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
814 /*
815 * Found real method, cache method in topgv if:
816 * 1. topgv has no synonyms (else inheritance crosses wires)
817 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
818 */
819 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 820 CV *old_cv = GvCV(topgv);
821 SvREFCNT_dec(old_cv);
e1a479c5 822 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 823 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 824 GvCVGEN(topgv) = topgen_cmp;
825 }
826 return candidate;
827 }
828 }
9607fc9c 829
e1a479c5
BB		 830 /* Check UNIVERSAL without caching */
831 if(level == 0 || level == -1) {
55df6700
FC		 832 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
833 flags &~GV_SUPER);
e1a479c5
BB		 834 if(candidate) {
835 cand_cv = GvCV(candidate);
836 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 837 CV *old_cv = GvCV(topgv);
838 SvREFCNT_dec(old_cv);
e1a479c5 839 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 840 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 841 GvCVGEN(topgv) = topgen_cmp;
842 }
843 return candidate;
844 }
845 }
846
847 if (topgv && GvREFCNT(topgv) == 1) {
848 /* cache the fact that the method is not defined */
849 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 850 }
851
79072805
LW		 852 return 0;
853}
854
c6afe666 855GV *
856Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
857{
858 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
859 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
860}
861
954c1994 862/*
460e5730
FC		 863=for apidoc gv_fetchmeth_autoload
864
865This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
866parameter.
867
d21989ed 868=for apidoc gv_fetchmeth_sv_autoload
611c1e95 869
d21989ed
BF		 870Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
871of an SV instead of a string/length pair.
872
873=cut
874*/
875
876GV *
877Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
878{
879 char *namepv;
880 STRLEN namelen;
881 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
882 namepv = SvPV(namesv, namelen);
883 if (SvUTF8(namesv))
884 flags |= SVf_UTF8;
885 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
886}
887
888/*
889=for apidoc gv_fetchmeth_pv_autoload
890
891Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
892instead of a string/length pair.
893
894=cut
895*/
896
897GV *
898Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
899{
900 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
901 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
902}
903
904/*
905=for apidoc gv_fetchmeth_pvn_autoload
906
796b6530 907Same as C<gv_fetchmeth_pvn()>, but looks for autoloaded subroutines too.
611c1e95
IZ		 908Returns a glob for the subroutine.
909
910For an autoloaded subroutine without a GV, will create a GV even
796b6530 911if C<level < 0>. For an autoloaded subroutine without a stub, C<GvCV()>
611c1e95
IZ		 912of the result may be zero.
913
796b6530 914Currently, the only significant value for C<flags> is C<SVf_UTF8>.
d21989ed 915
611c1e95
IZ		 916=cut
917*/
918
919GV *
d21989ed 920Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 921{
499321d3 922 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 923
d21989ed 924 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 925
611c1e95 926 if (!gv) {
611c1e95
IZ		 927 CV *cv;
928 GV **gvp;
929
930 if (!stash)
6136c704 931 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 932 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 933 return NULL;
d21989ed 934 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 935 return NULL;
611c1e95
IZ		 936 cv = GvCV(gv);
937 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 938 return NULL;
611c1e95
IZ		 939 /* Have an autoload */
940 if (level < 0) /* Cannot do without a stub */
d21989ed 941 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 942 gvp = (GV**)hv_fetch(stash, name,
943 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 944 if (!gvp)
6136c704 945 return NULL;
611c1e95
IZ		 946 return *gvp;
947 }
948 return gv;
949}
950
951/*
954c1994
GS		 952=for apidoc gv_fetchmethod_autoload
953
954Returns the glob which contains the subroutine to call to invoke the method
955on the C<stash>. In fact in the presence of autoloading this may be the
796b6530 956glob for "AUTOLOAD". In this case the corresponding variable C<$AUTOLOAD> is
b267980d 957already setup.
954c1994
GS		 958
959The third parameter of C<gv_fetchmethod_autoload> determines whether
960AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 961means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 962Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 963with a non-zero C<autoload> parameter.
954c1994 964
cec2d7b1
FC		 965These functions grant C<"SUPER"> token
966as a prefix of the method name. Note
954c1994
GS		 967that if you want to keep the returned glob for a long time, you need to
968check for it being "AUTOLOAD", since at the later time the call may load a
796b6530 969different subroutine due to C<$AUTOLOAD> changing its value. Use the glob
cec2d7b1 970created as a side effect to do this.
954c1994 971
cec2d7b1
FC		 972These functions have the same side-effects as C<gv_fetchmeth> with
973C<level==0>. The warning against passing the GV returned by
974C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS		 975
976=cut
977*/
978
dc848c6f 979GV *
864dbfa3 980Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 981{
547bb267
NC		 982 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
983
256d1bb2
NC		 984 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
985}
986
44130a26
BF		 987GV *
988Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
989{
990 char *namepv;
991 STRLEN namelen;
992 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
993 namepv = SvPV(namesv, namelen);
994 if (SvUTF8(namesv))
995 flags |= SVf_UTF8;
996 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
997}
998
999GV *
1000Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1001{
1002 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1003 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1004}
1005
256d1bb2
NC		 1006/* Don't merge this yet, as it's likely to get a len parameter, and possibly
1007 even a U32 hash */
1008GV *
44130a26 1009Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1010{
eb578fdb 1011 const char *nend;
c445ea15 1012 const char *nsplit = NULL;
a0d0e21e 1013 GV* gv;
0dae17bd 1014 HV* ostash = stash;
c94593d0 1015 const char * const origname = name;
ad64d0ec 1016 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 1017 const U32 autoload = flags & GV_AUTOLOAD;
1018 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1019 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1020
44130a26 1021 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1022
eff494dd 1023 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1024 stash = NULL;
c9bf4021
NC		 1025 else {
1026 /* The only way stash can become NULL later on is if nsplit is set,
1027 which in turn means that there is no need for a SVt_PVHV case
1028 the error reporting code. */
1029 }
b267980d 1030
44130a26 1031 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 1032 if (*nend == '\'') {
a0d0e21e 1033 nsplit = nend;
c94593d0
NC		 1034 name = nend + 1;
1035 }
1036 else if (*nend == ':' && *(nend + 1) == ':') {
1037 nsplit = nend++;
1038 name = nend + 1;
1039 }
a0d0e21e
LW		 1040 }
1041 if (nsplit) {
7edbdc6b 1042 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 1043 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 1044 stash = CopSTASH(PL_curcop);
1045 flags |= GV_SUPER;
cea2e8a9 1046 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1047 origname, HvENAME_get(stash), name) );
4633a7c4 1048 }
aae43805
FC		 1049 else if ((nsplit - origname) >= 7 &&
1050 strnEQ(nsplit - 7, "::SUPER", 7)) {
1051 /* don't autovifify if ->NoSuchStash::SUPER::method */
1052 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
1053 if (stash) flags |= GV_SUPER;
1054 }
e189a56d 1055 else {
af09ea45 1056 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1057 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 1058 }
0dae17bd 1059 ostash = stash;
4633a7c4
LW		 1060 }
1061
14d1dfbd 1062 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1063 if (!gv) {
2f6e0fe7 1064 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1065 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1066 else if (autoload)
c8416c26
BF		 1067 gv = gv_autoload_pvn(
1068 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1069 );
256d1bb2
NC		 1070 if (!gv && do_croak) {
1071 /* Right now this is exclusively for the benefit of S_method_common
1072 in pp_hot.c */
1073 if (stash) {
15e6cdd9
DG		 1074 /* If we can't find an IO::File method, it might be a call on
1075 * a filehandle. If IO:File has not been loaded, try to
1076 * require it first instead of croaking */
1077 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1078 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1079 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1080 STR_WITH_LEN("IO/File.pm"), 0,
1081 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1082 ) {
31b05a0f 1083 require_pv("IO/File.pm");
14d1dfbd 1084 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG		 1085 if (gv)
1086 return gv;
1087 }
256d1bb2 1088 Perl_croak(aTHX_
b17a0679 1089 "Can't locate object method \"%"UTF8f
d0c0e7dd 1090 "\" via package \"%"HEKf"\"",
b17a0679 1091 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1092 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1093 }
1094 else {
ecad31f0 1095 SV* packnamesv;
256d1bb2 1096
256d1bb2 1097 if (nsplit) {
ecad31f0
BF		 1098 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1099 SVs_TEMP | is_utf8);
256d1bb2 1100 } else {
017c5e4e 1101 packnamesv = error_report;
256d1bb2
NC		 1102 }
1103
1104 Perl_croak(aTHX_
b17a0679
FC		 1105 "Can't locate object method \"%"UTF8f
1106 "\" via package \"%"SVf"\""
ecad31f0 1107 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1108 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1109 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1110 }
1111 }
463ee0b2 1112 }
dc848c6f 1113 else if (autoload) {
9d4ba2ae 1114 CV* const cv = GvCV(gv);
09280a33
CS		 1115 if (!CvROOT(cv) && !CvXSUB(cv)) {
1116 GV* stubgv;
1117 GV* autogv;
1118
0c028dca 1119 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS		 1120 stubgv = gv;
1121 else {
1122 stubgv = CvGV(cv);
1123 if (GvCV(stubgv) != cv) /* orphaned import */
1124 stubgv = gv;
1125 }
c8416c26
BF		 1126 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1127 GvNAME(stubgv), GvNAMELEN(stubgv),
1128 GV_AUTOLOAD_ISMETHOD
1129 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1130 if (autogv)
1131 gv = autogv;
1132 }
1133 }
44a8e56a 1134
1135 return gv;
1136}
1137
1138GV*
0eeb01b9 1139Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1140{
1141 char *namepv;
1142 STRLEN namelen;
0fe84f7c 1143 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1144 namepv = SvPV(namesv, namelen);
1145 if (SvUTF8(namesv))
1146 flags |= SVf_UTF8;
0eeb01b9 1147 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1148}
1149
1150GV*
0eeb01b9 1151Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1152{
0fe84f7c 1153 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1154 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1155}
1156
1157GV*
0eeb01b9 1158Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1159{
44a8e56a 1160 GV* gv;
1161 CV* cv;
1162 HV* varstash;
1163 GV* vargv;
1164 SV* varsv;
c8416c26
BF		 1165 SV *packname = NULL;
1166 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1167
0fe84f7c 1168 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1169
7edbdc6b 1170 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1171 return NULL;
0dae17bd
GS		 1172 if (stash) {
1173 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1174 STRLEN packname_len = 0;
1175 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1176 packname = newSVpvn_flags(packname_ptr, packname_len,
1177 SVs_TEMP | SvUTF8(stash));
5c284bb0 1178 stash = NULL;
0dae17bd 1179 }
c8416c26
BF		 1180 else
1181 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1182 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1183 }
257dc59d
FC		 1184 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1185 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1186 return NULL;
dc848c6f 1187 cv = GvCV(gv);
1188
adb5a9ae 1189 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1190 return NULL;
ed850460 1191
dc848c6f 1192 /*
1193 * Inheriting AUTOLOAD for non-methods works ... for now.
1194 */
0eeb01b9
FC		 1195 if (
1196 !(flags & GV_AUTOLOAD_ISMETHOD)
1197 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1198 )
d1d15184 1199 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC		 1200 "Use of inherited AUTOLOAD for non-method %"SVf
1201 "::%"UTF8f"() is deprecated",
ecad31f0 1202 SVfARG(packname),
b17a0679 1203 UTF8fARG(is_utf8, len, name));
44a8e56a 1204
aed2304a 1205 if (CvISXSUB(cv)) {
bb619f37
FC		 1206 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1207 * and split that value on the last '::', pass along the same data
1208 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1209 *
1210 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1211 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1212 * type. Since SvPVX has been documented as returning the sub name
1213 * for a long time, but not as returning the prototype, we have
1214 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1215 * elsewhere.
1216 *
1217 * We put the prototype in the same allocated buffer, but after
1218 * the sub name. The SvPOK flag indicates the presence of a proto-
1219 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1220 * If both flags are on, then SvLEN is used to indicate the end of
1221 * the prototype (artificially lower than what is actually allo-
1222 * cated), at the risk of having to reallocate a few bytes unneces-
1223 * sarily--but that should happen very rarely, if ever.
1224 *
1225 * We use SvUTF8 for both prototypes and sub names, so if one is
1226 * UTF8, the other must be upgraded.
adb5a9ae 1227 */
c68d9564 1228 CvSTASH_set(cv, stash);
8fa6a409 1229 if (SvPOK(cv)) { /* Ouch! */
e7881358 1230 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1231 STRLEN ulen;
1232 const char *proto = CvPROTO(cv);
1233 assert(proto);
1234 if (SvUTF8(cv))
1235 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1236 ulen = SvCUR(tmpsv);
1237 SvCUR(tmpsv)++; /* include null in string */
1238 sv_catpvn_flags(
1239 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1240 );
1241 SvTEMP_on(tmpsv); /* Allow theft */
1242 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1243 SvTEMP_off(tmpsv);
e7881358 1244 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1245 SvLEN(cv) = SvCUR(cv) + 1;
1246 SvCUR(cv) = ulen;
1247 }
1248 else {
1249 sv_setpvn((SV *)cv, name, len);
1250 SvPOK_off(cv);
1251 if (is_utf8)
c8416c26 1252 SvUTF8_on(cv);
8fa6a409
FC		 1253 else SvUTF8_off(cv);
1254 }
1255 CvAUTOLOAD_on(cv);
adb5a9ae 1256 }
adb5a9ae 1257
44a8e56a 1258 /*
1259 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1260 * The subroutine's original name may not be "AUTOLOAD", so we don't
1261 * use that, but for lack of anything better we will use the sub's
1262 * original package to look up $AUTOLOAD.
1263 */
18691622 1264 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1265 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1266 ENTER;
1267
c69033f2 1268 if (!isGV(vargv)) {
04ec7e59 1269 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1270#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1271 GvSV(vargv) = newSV(0);
c69033f2
NC		 1272#endif
1273 }
3d35f11b 1274 LEAVE;
e203899d 1275 varsv = GvSVn(vargv);
4bac9ae4
CS		 1276 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1277 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1278 sv_setsv(varsv, packname);
396482e1 1279 sv_catpvs(varsv, "::");
d40bf27b
NC		 1280 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1281 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1282 sv_catpvn_flags(
1283 varsv, name, len,
5bcd1ef4 1284 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1285 );
c8416c26
BF		 1286 if (is_utf8)
1287 SvUTF8_on(varsv);
a0d0e21e
LW		 1288 return gv;
1289}
1290
44a2ac75
YO		 1291
1292/* require_tie_mod() internal routine for requiring a module
486ec47a 1293 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO		 1294 *
1295 * The "gv" parameter should be the glob.
45cbc99a
RGS		 1296 * "varpv" holds the name of the var, used for error messages.
1297 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1298 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1299 * are working reasonably close to as expected.
1300 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1301 * For the protection of $! to work (it is set by this routine)
1302 * the sv slot must already be magicalized.
d2c93421 1303 */
44a2ac75
YO		 1304STATIC HV*
1305S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1306{
da51bb9b 1307 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1308
7918f24d
NC		 1309 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1310
0ea03996 1311 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1312 SV *module = newSVsv(namesv);
1313 char varname = *varpv; /* varpv might be clobbered by load_module,
1314 so save it. For the moment it's always
1315 a single char. */
b82b06b8 1316 const char type = varname == '[' ? '$' : '%';
61bac25c 1317#ifdef DEBUGGING
d2c93421 1318 dSP;
61bac25c 1319#endif
d2c93421 1320 ENTER;
600beb2e 1321 SAVEFREESV(namesv);
44a2ac75 1322 if ( flags & 1 )
45cbc99a
RGS		 1323 save_scalar(gv);
1324 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1325 assert(sp == PL_stack_sp);
da51bb9b 1326 stash = gv_stashsv(namesv, 0);
44a2ac75 1327 if (!stash)
b82b06b8
FC		 1328 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1329 type, varname, SVfARG(namesv));
45cbc99a 1330 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1331 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1332 type, varname, SVfARG(namesv), methpv);
600beb2e 1333 LEAVE;
d2c93421 1334 }
e7881358 1335 else SvREFCNT_dec_NN(namesv);
44a2ac75 1336 return stash;
d2c93421
RH		 1337}
1338
954c1994
GS		 1339/*
1340=for apidoc gv_stashpv
1341
da51bb9b 1342Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1343determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1344
1345=cut
1346*/
1347
a0d0e21e 1348HV*
864dbfa3 1349Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1350{
7918f24d 1351 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1352 return gv_stashpvn(name, strlen(name), create);
1353}
1354
bc96cb06
SH		 1355/*
1356=for apidoc gv_stashpvn
1357
da51bb9b
NC		 1358Returns a pointer to the stash for a specified package. The C<namelen>
1359parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1360to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1361created if it does not already exist. If the package does not exist and
796b6530 1362C<flags> is 0 (or any other setting that does not create packages) then C<NULL>
da51bb9b
NC		 1363is returned.
1364
566a4718
YO		 1365Flags may be one of:
1366
1367 GV_ADD
1368 SVf_UTF8
1369 GV_NOADD_NOINIT
1370 GV_NOINIT
1371 GV_NOEXPAND
1372 GV_ADDMG
1373
796b6530 1374The most important of which are probably C<GV_ADD> and C<SVf_UTF8>.
bc96cb06 1375
808724c8 1376Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1377recommended for performance reasons.
1378
bc96cb06
SH		 1379=cut
1380*/
1381
0eadbdad
YO		 1382/*
1383gv_stashpvn_internal
1384
1385Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1386as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1387
1388*/
1389
4e7ebec5 1390PERL_STATIC_INLINE HV*
0eadbdad 1391S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1392{
0cea0058 1393 char smallbuf[128];
46fc3d4c 1394 char *tmpbuf;
a0d0e21e
LW		 1395 HV *stash;
1396 GV *tmpgv;
add0ecde 1397 U32 tmplen = namelen + 2;
dc437b57 1398
0eadbdad 1399 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1400
add0ecde 1401 if (tmplen <= sizeof smallbuf)
46fc3d4c 1402 tmpbuf = smallbuf;
1403 else
add0ecde
VP		 1404 Newx(tmpbuf, tmplen, char);
1405 Copy(name, tmpbuf, namelen, char);
1406 tmpbuf[namelen] = ':';
1407 tmpbuf[namelen+1] = ':';
1408 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1409 if (tmpbuf != smallbuf)
1410 Safefree(tmpbuf);
d2fcb1d6 1411 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1412 return NULL;
a0d0e21e 1413 stash = GvHV(tmpgv);
1f656fcf 1414 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1415 assert(stash);
1f656fcf 1416 if (!HvNAME_get(stash)) {
0be4d16f 1417 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1418
1419 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1420 /* If the containing stash has multiple effective
1421 names, see that this one gets them, too. */
1422 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1423 mro_package_moved(stash, NULL, tmpgv, 1);
1424 }
a0d0e21e 1425 return stash;
463ee0b2
LW		 1426}
1427
808724c8 1428/*
1429gv_stashsvpvn_cached
1430
1431Returns a pointer to the stash for a specified package, possibly
1432cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1433
1434Requires one of either namesv or namepv to be non-null.
1435
fbe13c60 1436See C<L</gv_stashpvn>> for details on "flags".
808724c8 1437
1438Note the sv interface is strongly preferred for performance reasons.
1439
1440*/
1441
1442#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1443 assert(namesv || name)
1444
1445PERL_STATIC_INLINE HV*
1446S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1447{
1448 HV* stash;
808724c8 1449 HE* he;
1450
1451 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1452
1453 he = (HE *)hv_common(
1454 PL_stashcache, namesv, name, namelen,
4e7ebec5 1455 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1456 );
808724c8 1457
4e7ebec5 1458 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1459 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1460
808724c8 1461 if (namesv) {
1462 if (SvOK(namesv)) { /* prevent double uninit warning */
1463 STRLEN len;
1464 name = SvPV_const(namesv, len);
1465 namelen = len;
1466 flags |= SvUTF8(namesv);
1467 } else {
1468 name = ""; namelen = 0;
1469 }
1470 }
0eadbdad
YO		 1471 stash = gv_stashpvn_internal(name, namelen, flags);
1472
4e7ebec5 1473 if (stash && namelen) {
1474 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1475 (void)hv_store(PL_stashcache, name,
4e7ebec5 1476 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1477 }
808724c8 1478
4e7ebec5 1479 return stash;
1480}
1481
808724c8 1482HV*
1483Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1484{
1485 PERL_ARGS_ASSERT_GV_STASHPVN;
1486 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1487}
1488
954c1994
GS		 1489/*
1490=for apidoc gv_stashsv
1491
fbe13c60
KW		 1492Returns a pointer to the stash for a specified package. See
1493C<L</gv_stashpvn>>.
954c1994 1494
fbe13c60
KW		 1495Note this interface is strongly preferred over C<gv_stashpvn> for performance
1496reasons.
808724c8 1497
954c1994
GS		 1498=cut
1499*/
1500
a0d0e21e 1501HV*
da51bb9b 1502Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1503{
7918f24d 1504 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1505 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW		 1506}
1507
1508
463ee0b2 1509GV *
fe9845cc 1510Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1511 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1512 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1513}
1514
1515GV *
fe9845cc 1516Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1517 STRLEN len;
77cb3b01
FC		 1518 const char * const nambeg =
1519 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1520 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1521 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1522}
1523
90aeefb4 1524PERL_STATIC_INLINE void
290a1700 1525S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1526{
1527 AV* av;
1528
1529 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1530
1531 av = GvAVn(gv);
1532 GvMULTI_on(gv);
1533 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1534 NULL, 0);
ad7cce9f
FR		 1535}
1536
90aeefb4
BF		 1537/* This function grabs name and tries to split a stash and glob
1538 * from its contents. TODO better description, comments
1539 *
1540 * If the function returns TRUE and 'name == name_end', then
1541 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1542 */
1543PERL_STATIC_INLINE bool
1544S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1545 STRLEN *len, const char *nambeg, STRLEN full_len,
1546 const U32 is_utf8, const I32 add)
1547{
1548 const char *name_cursor;
1549 const char *const name_end = nambeg + full_len;
1550 const char *const name_em1 = name_end - 1;
1551
1552 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1553
1554 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1555 /* accidental stringify on a GV? */
1556 (*name)++;
1557 }
1558
1559 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1560 if (name_cursor < name_em1 &&
1561 ((*name_cursor == ':' && name_cursor[1] == ':')
1562 || *name_cursor == '\''))
1563 {
1564 if (!*stash)
1565 *stash = PL_defstash;
1566 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1567 return FALSE;
1568
1569 *len = name_cursor - *name;
1570 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1571 const char *key;
1572 GV**gvp;
1573 if (*name_cursor == ':') {
1574 key = *name;
1575 *len += 2;
1576 }
1577 else {
1578 char *tmpbuf;
1579 Newx(tmpbuf, *len+2, char);
1580 Copy(*name, tmpbuf, *len, char);
1581 tmpbuf[(*len)++] = ':';
1582 tmpbuf[(*len)++] = ':';
1583 key = tmpbuf;
1584 }
c161da64 1585 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF		 1586 *gv = gvp ? *gvp : NULL;
1587 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1588 if (SvTYPE(*gv) != SVt_PVGV)
1589 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1590 else
1591 GvMULTI_on(*gv);
1592 }
1593 if (key != *name)
1594 Safefree(key);
1595 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1596 return FALSE;
1597
1598 if (!(*stash = GvHV(*gv))) {
1599 *stash = GvHV(*gv) = newHV();
1600 if (!HvNAME_get(*stash)) {
1601 if (GvSTASH(*gv) == PL_defstash && *len == 6
1602 && strnEQ(*name, "CORE", 4))
1603 hv_name_set(*stash, "CORE", 4, 0);
1604 else
1605 hv_name_set(
1606 *stash, nambeg, name_cursor-nambeg, is_utf8
1607 );
1608 /* If the containing stash has multiple effective
1609 names, see that this one gets them, too. */
1610 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1611 mro_package_moved(*stash, NULL, *gv, 1);
1612 }
1613 }
1614 else if (!HvNAME_get(*stash))
1615 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1616 }
1617
1618 if (*name_cursor == ':')
1619 name_cursor++;
1620 *name = name_cursor+1;
1621 if (*name == name_end) {
1622 if (!*gv)
1623 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1624 return TRUE;
1625 }
1626 }
1627 }
1628 *len = name_cursor - *name;
1629 return TRUE;
1630}
1631
536d1a88 1632/* Checks if an unqualified name is in the main stash */
90aeefb4 1633PERL_STATIC_INLINE bool
536d1a88 1634S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1635{
536d1a88 1636 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1637
90aeefb4 1638 /* If it's an alphanumeric variable */
536d1a88 1639 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF		 1640 /* Some "normal" variables are always in main::,
1641 * like INC or STDOUT.
1642 */
1643 switch (len) {
1644 case 1:
1645 if (*name == '_')
536d1a88 1646 return TRUE;
90aeefb4
BF		 1647 break;
1648 case 3:
1649 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1650 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1651 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1652 return TRUE;
90aeefb4
BF		 1653 break;
1654 case 4:
1655 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1656 && name[3] == 'V')
536d1a88 1657 return TRUE;
90aeefb4
BF		 1658 break;
1659 case 5:
1660 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1661 && name[3] == 'I' && name[4] == 'N')
536d1a88 1662 return TRUE;
90aeefb4
BF		 1663 break;
1664 case 6:
1665 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1666 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1667 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1668 return TRUE;
90aeefb4
BF		 1669 break;
1670 case 7:
1671 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1672 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1673 && name[6] == 'T')
536d1a88 1674 return TRUE;
90aeefb4
BF		 1675 break;
1676 }
536d1a88
BF		 1677 }
1678 /* *{""}, or a special variable like $@ */
1679 else
1680 return TRUE;
1681
1682 return FALSE;
1683}
1684
1685
1686/* This function is called if parse_gv_stash_name() failed to
1687 * find a stash, or if GV_NOTQUAL or an empty name was passed
1688 * to gv_fetchpvn_flags.
1689 *
1690 * It returns FALSE if the default stash can't be found nor created,
1691 * which might happen during global destruction.
1692 */
1693PERL_STATIC_INLINE bool
1694S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1695 const U32 is_utf8, const I32 add,
1696 const svtype sv_type)
1697{
1698 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1699
1700 /* No stash in name, so see how we can default */
90aeefb4 1701
536d1a88
BF		 1702 if ( gv_is_in_main(name, len, is_utf8) ) {
1703 *stash = PL_defstash;
1704 }
1705 else {
1706 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1707 *stash = PL_curstash;
1708 if (add && (PL_hints & HINT_STRICT_VARS) &&
1709 sv_type != SVt_PVCV &&
1710 sv_type != SVt_PVGV &&
1711 sv_type != SVt_PVFM &&
1712 sv_type != SVt_PVIO &&
1713 !(len == 1 && sv_type == SVt_PV &&
1714 (*name == 'a' || *name == 'b')) )
1715 {
c161da64 1716 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1717 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1718 SvTYPE(*gvp) != SVt_PVGV)
1719 {
1720 *stash = NULL;
1721 }
1722 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1723 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1724 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1725 {
1726 /* diag_listed_as: Variable "%s" is not imported%s */
1727 Perl_ck_warner_d(
1728 aTHX_ packWARN(WARN_MISC),
1729 "Variable \"%c%"UTF8f"\" is not imported",
1730 sv_type == SVt_PVAV ? '@' :
1731 sv_type == SVt_PVHV ? '%' : '$',
1732 UTF8fARG(is_utf8, len, name));
1733 if (GvCVu(*gvp))
1734 Perl_ck_warner_d(
1735 aTHX_ packWARN(WARN_MISC),
1736 "\t(Did you mean &%"UTF8f" instead?)\n",
1737 UTF8fARG(is_utf8, len, name)
1738 );
1739 *stash = NULL;
1740 }
1741 }
1742 }
1743 else {
1744 /* Use the current op's stash */
1745 *stash = CopSTASH(PL_curcop);
1746 }
1747 }
90aeefb4
BF		 1748
1749 if (!*stash) {
1750 if (add && !PL_in_clean_all) {
10860bf4
FC		 1751 GV *gv;
1752 qerror(Perl_mess(aTHX_
90aeefb4 1753 "Global symbol \"%s%"UTF8f
d8c6310a
FC		 1754 "\" requires explicit package name (did you forget to "
1755 "declare \"my %s%"UTF8f"\"?)",
1756 (sv_type == SVt_PV ? "$"
1757 : sv_type == SVt_PVAV ? "@"
1758 : sv_type == SVt_PVHV ? "%"
1759 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF		 1760 (sv_type == SVt_PV ? "$"
1761 : sv_type == SVt_PVAV ? "@"
1762 : sv_type == SVt_PVHV ? "%"
10860bf4 1763 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF		 1764 /* To maintain the output of errors after the strict exception
1765 * above, and to keep compat with older releases, rather than
1766 * placing the variables in the pad, we place
1767 * them in the <none>:: stash.
1768 */
90aeefb4
BF		 1769 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1770 if (!gv) {
1771 /* symbol table under destruction */
1772 return FALSE;
1773 }
1774 *stash = GvHV(gv);
1775 }
1776 else
1777 return FALSE;
1778 }
1779
1780 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1781 return FALSE;
1782
1783 return TRUE;
1784}
1785
8c995aba
FC		 1786/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1787 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1788 this file. */
1789#undef SvREADONLY_on
1790#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1791
930867a8
BF		 1792/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1793 * a new GV.
1794 * Note that it does not insert the GV into the stash prior to
1795 * magicalization, which some variables require need in order
1796 * to work (like $[, %+, %-, %!), so callers must take care of
1797 * that beforehand.
1798 *
1799 * The return value has a specific meaning for gv_fetchpvn_flags:
1800 * If it returns true, and the gv is empty, it indicates that its
1801 * refcount should be decreased.
1802 */
1803PERL_STATIC_INLINE bool
1804S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1805 bool addmg, const svtype sv_type)
79072805 1806{
960b831f 1807 SSize_t paren;
79072805 1808
930867a8 1809 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1810
44428a46 1811 if (stash != PL_defstash) { /* not the main stash */
ea238638 1812 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1813 and VERSION. All the others apply only to the main stash or to
1814 CORE (which is checked right after this). */
ea238638 1815 if (len) {
b464bac0 1816 const char * const name2 = name + 1;
cc4c2da6 1817 switch (*name) {
cc4c2da6
NC		 1818 case 'E':
1819 if (strnEQ(name2, "XPORT", 5))
1820 GvMULTI_on(gv);
1821 break;
1822 case 'I':
44428a46 1823 if (strEQ(name2, "SA"))
290a1700 1824 gv_magicalize_isa(gv);
cc4c2da6 1825 break;
44428a46
FC		 1826 case 'V':
1827 if (strEQ(name2, "ERSION"))
1828 GvMULTI_on(gv);
1829 break;
ea238638
FC		 1830 case 'a':
1831 case 'b':
1832 if (len == 1 && sv_type == SVt_PV)
1833 GvMULTI_on(gv);
924ba076 1834 /* FALLTHROUGH */
4aaa4757
FC		 1835 default:
1836 goto try_core;
1837 }
930867a8 1838 return addmg;
4aaa4757
FC		 1839 }
1840 try_core:
1841 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1842 /* Avoid null warning: */
1843 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1844 if (strnEQ(stashname, "CORE", 4))
1845 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1846 }
1847 }
1848 else if (len > 1) {
1849#ifndef EBCDIC
1850 if (*name > 'V' ) {
1851 NOOP;
1852 /* Nothing else to do.
1853 The compiler will probably turn the switch statement into a
1854 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1855 the common case of lower case variable names. (On EBCDIC
1856 platforms, we can't just do:
1857 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1858 because cases like '\027' in the switch statement below are
1859 C1 (non-ASCII) controls on those platforms, so the remapping
1860 would make them larger than 'V')
1861 */
44428a46
FC		 1862 } else
1863#endif
1864 {
3e669301 1865 const char * name2 = name + 1;
44428a46
FC		 1866 switch (*name) {
1867 case 'A':
1868 if (strEQ(name2, "RGV")) {
1869 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1870 }
1871 else if (strEQ(name2, "RGVOUT")) {
1872 GvMULTI_on(gv);
1873 }
1874 break;
1875 case 'E':
1876 if (strnEQ(name2, "XPORT", 5))
1877 GvMULTI_on(gv);
1878 break;
1879 case 'I':
1880 if (strEQ(name2, "SA")) {
290a1700 1881 gv_magicalize_isa(gv);
44428a46
FC		 1882 }
1883 break;
cc4c2da6
NC		 1884 case 'S':
1885 if (strEQ(name2, "IG")) {
1886 HV *hv;
1887 I32 i;
d525a7b2
NC		 1888 if (!PL_psig_name) {
1889 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1890 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1891 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1892 } else {
1893 /* I think that the only way to get here is to re-use an
1894 embedded perl interpreter, where the previous
1895 use didn't clean up fully because
1896 PL_perl_destruct_level was 0. I'm not sure that we
1897 "support" that, in that I suspect in that scenario
1898 there are sufficient other garbage values left in the
1899 interpreter structure that something else will crash
1900 before we get here. I suspect that this is one of
1901 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1902 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1903 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1904 }
1905 GvMULTI_on(gv);
1906 hv = GvHVn(gv);
a0714e2c 1907 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1908 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1909 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1910 if (init)
1911 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1912 }
1913 }
1914 break;
1915 case 'V':
1916 if (strEQ(name2, "ERSION"))
1917 GvMULTI_on(gv);
1918 break;
e5218da5
GA		 1919 case '\003': /* $^CHILD_ERROR_NATIVE */
1920 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1921 goto magicalize;
1922 break;
cc4c2da6 1923 case '\005': /* $^ENCODING */
3e669301
KW		 1924 if (*name2 == '_') {
1925 name2++;
1926 }
cc4c2da6
NC		 1927 if (strEQ(name2, "NCODING"))
1928 goto magicalize;
1929 break;
9ebf26ad
FR		 1930 case '\007': /* $^GLOBAL_PHASE */
1931 if (strEQ(name2, "LOBAL_PHASE"))
1932 goto ro_magicalize;
1933 break;
8561ea1d
FC		 1934 case '\014': /* $^LAST_FH */
1935 if (strEQ(name2, "AST_FH"))
1936 goto ro_magicalize;
1937 break;
cde0cee5 1938 case '\015': /* $^MATCH */
960b831f
NC		 1939 if (strEQ(name2, "ATCH")) {
1940 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1941 goto storeparen;
1942 }
66230c86 1943 break;
cc4c2da6
NC		 1944 case '\017': /* $^OPEN */
1945 if (strEQ(name2, "PEN"))
1946 goto magicalize;
1947 break;
cde0cee5 1948 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC		 1949 if (strEQ(name2, "REMATCH")) {
1950 paren = RX_BUFF_IDX_CARET_PREMATCH;
1951 goto storeparen;
1952 }
1953 if (strEQ(name2, "OSTMATCH")) {
1954 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1955 goto storeparen;
1956 }
9ebf26ad 1957 break;
cc4c2da6
NC		 1958 case '\024': /* ${^TAINT} */
1959 if (strEQ(name2, "AINT"))
1960 goto ro_magicalize;
1961 break;
7cebcbc0 1962 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1963 if (strEQ(name2, "NICODE"))
cc4c2da6 1964 goto ro_magicalize;
a0288114 1965 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1966 goto ro_magicalize;
e07ea26a
NC		 1967 if (strEQ(name2, "TF8CACHE"))
1968 goto magicalize;
cc4c2da6
NC		 1969 break;
1970 case '\027': /* $^WARNING_BITS */
1971 if (strEQ(name2, "ARNING_BITS"))
1972 goto magicalize;
8ca2a5d6
DD		 1973#ifdef WIN32
1974 else if (strEQ(name2, "IN32_SLOPPY_STAT"))
1975 goto magicalize;
1976#endif
cc4c2da6
NC		 1977 break;
1978 case '1':
1979 case '2':
1980 case '3':
1981 case '4':
1982 case '5':
1983 case '6':
1984 case '7':
1985 case '8':
1986 case '9':
85e6fe83 1987 {
2fdbfb4d
AB		 1988 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1989 this test */
22ff3130
HS		 1990 UV uv;
1991 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1992 return addmg;
1993 /* XXX why are we using a SSize_t? */
1994 paren = (SSize_t)(I32)uv;
960b831f 1995 goto storeparen;
1d7c1841 1996 }
dc437b57 1997 }
93a17b20 1998 }
392db708
NC		 1999 } else {
2000 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2001 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2002 switch (*name) {
6361f656 2003 case '&': /* $& */
960b831f
NC		 2004 paren = RX_BUFF_IDX_FULLMATCH;
2005 goto sawampersand;
6361f656 2006 case '`': /* $` */
960b831f
NC		 2007 paren = RX_BUFF_IDX_PREMATCH;
2008 goto sawampersand;
6361f656 2009 case '\'': /* $' */
960b831f
NC		 2010 paren = RX_BUFF_IDX_POSTMATCH;
2011 sawampersand:
1a904fc8 2012#ifdef PERL_SAWAMPERSAND
a289ef89 2013 if (!(
cc4c2da6
NC		 2014 sv_type == SVt_PVAV ||
2015 sv_type == SVt_PVHV ||
2016 sv_type == SVt_PVCV ||
2017 sv_type == SVt_PVFM ||
2018 sv_type == SVt_PVIO
d3b97530
DM		 2019 )) { PL_sawampersand |=
2020 (*name == '`')
2021 ? SAWAMPERSAND_LEFT
2022 : (*name == '&')
2023 ? SAWAMPERSAND_MIDDLE
2024 : SAWAMPERSAND_RIGHT;
2025 }
1a904fc8 2026#endif
960b831f 2027 goto storeparen;
e91d8259
NC		 2028 case '1': /* $1 */
2029 case '2': /* $2 */
2030 case '3': /* $3 */
2031 case '4': /* $4 */
2032 case '5': /* $5 */
2033 case '6': /* $6 */
2034 case '7': /* $7 */
2035 case '8': /* $8 */
2036 case '9': /* $9 */
960b831f
NC		 2037 paren = *name - '0';
2038
2039 storeparen:
e91d8259
NC		 2040 /* Flag the capture variables with a NULL mg_ptr
2041 Use mg_len for the array index to lookup. */
960b831f 2042 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2043 break;
cc4c2da6 2044
6361f656 2045 case ':': /* $: */
c69033f2 2046 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 2047 goto magicalize;
2048
6361f656 2049 case '?': /* $? */
ff0cee69 2050#ifdef COMPLEX_STATUS
c69033f2 2051 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2052#endif
cc4c2da6 2053 goto magicalize;
ff0cee69 2054
6361f656 2055 case '!': /* $! */
67261566 2056 GvMULTI_on(gv);
44a2ac75 2057 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2058
ad64d0ec 2059 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2060
44a2ac75 2061 /* magicalization must be done before require_tie_mod is called */
67261566 2062 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 2063 {
44a2ac75 2064 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 2065 addmg = FALSE;
ffdb8bcd 2066 }
d2c93421 2067
6cef1e77 2068 break;
6361f656
AB		 2069 case '-': /* $- */
2070 case '+': /* $+ */
44a2ac75
YO		 2071 GvMULTI_on(gv); /* no used once warnings here */
2072 {
44a2ac75 2073 AV* const av = GvAVn(gv);
ad64d0ec 2074 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2075
ad64d0ec
NC		 2076 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2077 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2078 if (avc)
44a2ac75 2079 SvREADONLY_on(GvSVn(gv));
44a2ac75 2080 SvREADONLY_on(av);
67261566
YO		 2081
2082 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 2083 {
192b9cd1 2084 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 2085 addmg = FALSE;
213084e4 2086 }
67261566 2087
80305961 2088 break;
cc4c2da6 2089 }
6361f656
AB		 2090 case '*': /* $* */
2091 case '#': /* $# */
9b387841 2092 if (sv_type == SVt_PV)
4f650b80 2093 /* diag_listed_as: $* is no longer supported */
9b387841 2094 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2095 "$%c is no longer supported", *name);
8ae1fe26 2096 break;
b3ca2e83
NC		 2097 case '\010': /* $^H */
2098 {
2099 HV *const hv = GvHVn(gv);
2100 hv_magic(hv, NULL, PERL_MAGIC_hints);
2101 }
2102 goto magicalize;
b82b06b8 2103 case '[': /* $[ */
7d69d4a6 2104 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2105 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 2106 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 2107 addmg = FALSE;
b82b06b8 2108 }
7d69d4a6 2109 else goto magicalize;
b82b06b8 2110 break;
cc4c2da6 2111 case '\023': /* $^S */
2fdbfb4d
AB		 2112 ro_magicalize:
2113 SvREADONLY_on(GvSVn(gv));
924ba076 2114 /* FALLTHROUGH */
6361f656 2115 case '0': /* $0 */
6361f656
AB		 2116 case '^': /* $^ */
2117 case '~': /* $~ */
2118 case '=': /* $= */
2119 case '%': /* $% */
2120 case '.': /* $. */
2121 case '(': /* $( */
2122 case ')': /* $) */
2123 case '<': /* $< */
2124 case '>': /* $> */
2125 case '\\': /* $\ */
2126 case '/': /* $/ */
4505a31f 2127 case '|': /* $| */
9cdac2a2 2128 case '$': /* $$ */
cc4c2da6
NC		 2129 case '\001': /* $^A */
2130 case '\003': /* $^C */
2131 case '\004': /* $^D */
2132 case '\005': /* $^E */
2133 case '\006': /* $^F */
cc4c2da6
NC		 2134 case '\011': /* $^I, NOT \t in EBCDIC */
2135 case '\016': /* $^N */
2136 case '\017': /* $^O */
2137 case '\020': /* $^P */
2138 case '\024': /* $^T */
2139 case '\027': /* $^W */
2140 magicalize:
ad64d0ec 2141 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2142 break;
e521374c 2143
cc4c2da6 2144 case '\014': /* $^L */
76f68e9b 2145 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2146 break;
6361f656 2147 case ';': /* $; */
76f68e9b 2148 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2149 break;
6361f656 2150 case ']': /* $] */
cc4c2da6 2151 {
3638bf15 2152 SV * const sv = GvSV(gv);
d7aa5382 2153 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2154 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2155 GvSV(gv) = vnumify(PL_patchlevel);
2156 SvREADONLY_on(GvSV(gv));
2157 SvREFCNT_dec(sv);
93a17b20
LW		 2158 }
2159 break;
cc4c2da6
NC		 2160 case '\026': /* $^V */
2161 {
3638bf15 2162 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2163 GvSV(gv) = new_version(PL_patchlevel);
2164 SvREADONLY_on(GvSV(gv));
2165 SvREFCNT_dec(sv);
16070b82
GS		 2166 }
2167 break;
ea238638
FC		 2168 case 'a':
2169 case 'b':
dc3e91f6 2170 if (sv_type == SVt_PV)
ea238638 2171 GvMULTI_on(gv);
cc4c2da6 2172 }
79072805 2173 }
930867a8
BF		 2174
2175 return addmg;
71c35c05
BF		 2176}
2177
8c995aba
FC		 2178/* If we do ever start using this later on in the file, we need to make
2179 sure we don’t accidentally use the wrong definition. */
2180#undef SvREADONLY_on
2181
070dc475
BF		 2182/* This function is called when the stash already holds the GV of the magic
2183 * variable we're looking for, but we need to check that it has the correct
2184 * kind of magic. For example, if someone first uses $! and then %!, the
2185 * latter would end up here, and we add the Errno tie to the HASH slot of
2186 * the *! glob.
2187 */
2188PERL_STATIC_INLINE void
2189S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2190{
2191 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2192
2193 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2194 if (*name == '!')
2195 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2196 else if (*name == '-' || *name == '+')
2197 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2198 } else if (sv_type == SVt_PV) {
2199 if (*name == '*' || *name == '#') {
2200 /* diag_listed_as: $* is no longer supported */
2201 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2202 WARN_SYNTAX),
2203 "$%c is no longer supported", *name);
2204 }
2205 }
2206 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2207 switch (*name) {
2208 case '[':
2209 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2210 break;
2211#ifdef PERL_SAWAMPERSAND
2212 case '`':
2213 PL_sawampersand |= SAWAMPERSAND_LEFT;
2214 (void)GvSVn(gv);
2215 break;
2216 case '&':
2217 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2218 (void)GvSVn(gv);
2219 break;
2220 case '\'':
2221 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2222 (void)GvSVn(gv);
2223 break;
2224#endif
2225 }
2226 }
2227}
2228
71c35c05
BF		 2229GV *
2230Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2231 const svtype sv_type)
2232{
71c35c05
BF		 2233 const char *name = nambeg;
2234 GV *gv = NULL;
2235 GV**gvp;
2236 STRLEN len;
2237 HV *stash = NULL;
2238 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2239 const I32 no_expand = flags & GV_NOEXPAND;
2240 const I32 add = flags & ~GV_NOADD_MASK;
2241 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2242 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2243 const char *const name_end = nambeg + full_len;
2244 U32 faking_it;
2245
2246 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2247
2248 /* If we have GV_NOTQUAL, the caller promised that
2249 * there is no stash, so we can skip the check.
2250 * Similarly if full_len is 0, since then we're
2251 * dealing with something like *{""} or ""->foo()
2252 */
2253 if ((flags & GV_NOTQUAL) || !full_len) {
2254 len = full_len;
2255 }
2256 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2257 if (name == name_end) return gv;
2258 }
2259 else {
2260 return NULL;
2261 }
2262
2263 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2264 return NULL;
2265 }
2266
2267 /* By this point we should have a stash and a name */
c161da64 2268 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2269 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2270 if (addmg) gv = (GV *)newSV(0);
2271 else return NULL;
2272 }
2273 else gv = *gvp, addmg = 0;
2274 /* From this point on, addmg means gv has not been inserted in the
2275 symtab yet. */
2276
2277 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2278 /* The GV already exists, so return it, but check if we need to do
2279 * anything else with it before that.
2280 */
71c35c05 2281 if (add) {
c002ae9a
BF		 2282 /* This is the heuristic that handles if a variable triggers the
2283 * 'used only once' warning. If there's already a GV in the stash
2284 * with this name, then we assume that the variable has been used
2285 * before and turn its MULTI flag on.
2286 * It's a heuristic because it can easily be "tricked", like with
2287 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2288 * not warning about $main::foo being used just once
2289 */
71c35c05
BF		 2290 GvMULTI_on(gv);
2291 gv_init_svtype(gv, sv_type);
2292 /* You reach this path once the typeglob has already been created,
2293 either by the same or a different sigil. If this path didn't
2294 exist, then (say) referencing $! first, and %! second would
2295 mean that %! was not handled correctly. */
2296 if (len == 1 && stash == PL_defstash) {
070dc475 2297 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2298 }
2299 else if (len == 3 && sv_type == SVt_PVAV
2300 && strnEQ(name, "ISA", 3)
2301 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2302 gv_magicalize_isa(gv);
2303 }
2304 return gv;
2305 } else if (no_init) {
2306 assert(!addmg);
2307 return gv;
c002ae9a
BF		 2308 }
2309 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2310 * don't expand it to a glob. This is an optimization so that things
2311 * copying constants over, like Exporter, don't have to be rewritten
2312 * to take into account that you can store more than just globs in
2313 * stashes.
2314 */
2315 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2316 assert(!addmg);
2317 return gv;
2318 }
2319
2320 /* Adding a new symbol.
2321 Unless of course there was already something non-GV here, in which case
2322 we want to behave as if there was always a GV here, containing some sort
2323 of subroutine.
2324 Otherwise we run the risk of creating things like GvIO, which can cause
2325 subtle bugs. eg the one that tripped up SQL::Translator */
2326
2327 faking_it = SvOK(gv);
2328
2329 if (add & GV_ADDWARN)
2330 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2331 "Had to create %"UTF8f" unexpectedly",
2332 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2333 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2334
9e5de6ae 2335 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2336 GvMULTI_on(gv) ;
2337
930867a8
BF		 2338 /* First, store the gv in the symtab if we're adding magic,
2339 * but only for non-empty GVs
2340 */
2341#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2342 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2343
2344 if ( addmg && !GvEMPTY(gv) ) {
2345 (void)hv_store(stash,name,len,(SV *)gv,0);
2346 }
2347
71c35c05 2348 /* set up magic where warranted */
930867a8
BF		 2349 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2350 /* See 23496c6 */
2351 if (GvEMPTY(gv)) {
2352 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2353 /* The GV was and still is "empty", except that now
2354 * it has the magic flags turned on, so we want it
2355 * stored in the symtab.
2356 */
2357 (void)hv_store(stash,name,len,(SV *)gv,0);
2358 }
2359 else {
2360 /* Most likely the temporary GV created above */
2361 SvREFCNT_dec_NN(gv);
2362 gv = NULL;
2363 }
2364 }
2365 }
71c35c05 2366
e6066781 2367 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2368 return gv;
79072805
LW		 2369}
2370
2371void
35a4481c 2372Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2373{
ed60a868 2374 const char *name;
35a4481c 2375 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2376
2377 PERL_ARGS_ASSERT_GV_FULLNAME4;
2378
666ea192 2379 sv_setpv(sv, prefix ? prefix : "");
a0288114 2380
52a6327b 2381 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2382 const STRLEN len = HvNAMELEN(hv);
2383 if (keepmain || strnNE(name, "main", len)) {
2384 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2385 sv_catpvs(sv,"::");
ed60a868 2386 }
43693395 2387 }
ed60a868 2388 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2389 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2390}
2391
2392void
35a4481c 2393Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2394{
099be4f1 2395 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2396
2397 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2398
46c461b5 2399 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2400}
2401
39a65960
DM		 2402
2403/* recursively scan a stash and any nested stashes looking for entries
2404 * that need the "only used once" warning raised
2405 */
2406
79072805 2407void
51da40ed 2408Perl_gv_check(pTHX_ HV *stash)
79072805 2409{
eb578fdb 2410 I32 i;
463ee0b2 2411
7918f24d
NC		 2412 PERL_ARGS_ASSERT_GV_CHECK;
2413
9e5cda6b 2414 if (!SvOOK(stash))
8990e307 2415 return;
90754377 2416
9e5cda6b 2417 assert(HvARRAY(stash));
90754377 2418
a0d0e21e 2419 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2420 const HE *entry;
90754377 2421 /* mark stash is being scanned, to avoid recursing */
339441ef 2422 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2423 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2424 GV *gv;
b7787f18 2425 HV *hv;
e7acdfe9
DM		 2426 STRLEN keylen = HeKLEN(entry);
2427 const char * const key = HeKEY(entry);
2428
2429 if (keylen >= 2 && key[keylen-2] == ':' && key[keylen-1] == ':' &&
159b6efe 2430 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2431 {
90754377
DM		 2432 if (hv != PL_defstash && hv != stash
2433 && !(SvOOK(hv)
2434 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2435 )
a0d0e21e
LW		 2436 gv_check(hv); /* nested package */
2437 }
ecad31f0
BF		 2438 else if ( *HeKEY(entry) != '_'
2439 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2440 const char *file;
159b6efe 2441 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2442 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2443 continue;
1d7c1841 2444 file = GvFILE(gv);
1d7c1841 2445 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2446#ifdef USE_ITHREADS
2447 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2448#else
2449 CopFILEGV(PL_curcop)
2450 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2451#endif
9014280d 2452 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2453 "Name \"%"HEKf"::%"HEKf
2454 "\" used only once: possible typo",
2455 HEKfARG(HvNAME_HEK(stash)),
2456 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2457 }
79072805 2458 }
339441ef 2459 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2460 }
2461}
2462
2463GV *
9cc50d5b 2464Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2465{
9cc50d5b 2466 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2467 assert(!(flags & ~SVf_UTF8));
7918f24d 2468
b17a0679
FC		 2469 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2470 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2471 (long)PL_gensym++),
2472 GV_ADD, SVt_PVGV);
79072805
LW		 2473}
2474
2475/* hopefully this is only called on local symbol table entries */
2476
2477GP*
864dbfa3 2478Perl_gp_ref(pTHX_ GP *gp)
79072805 2479{
1d7c1841 2480 if (!gp)
d4c19fe8 2481 return NULL;
79072805 2482 gp->gp_refcnt++;
44a8e56a 2483 if (gp->gp_cv) {
2484 if (gp->gp_cvgen) {
e1a479c5
BB		 2485 /* If the GP they asked for a reference to contains
2486 a method cache entry, clear it first, so that we
2487 don't infect them with our cached entry */
e7881358 2488 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2489 gp->gp_cv = NULL;
44a8e56a 2490 gp->gp_cvgen = 0;
2491 }
44a8e56a 2492 }
79072805 2493 return gp;
79072805
LW		 2494}
2495
2496void
864dbfa3 2497Perl_gp_free(pTHX_ GV *gv)
79072805 2498{
79072805 2499 GP* gp;
b0d55c99 2500 int attempts = 100;
79072805 2501
f7877b28 2502 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2503 return;
f248d071 2504 if (gp->gp_refcnt == 0) {
9b387841
NC		 2505 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2506 "Attempt to free unreferenced glob pointers"
2507 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2508 return;
2509 }
4571f4a7 2510 if (gp->gp_refcnt > 1) {
bc81b34d 2511 borrowed:
748a9306
LW		 2512 if (gp->gp_egv == gv)
2513 gp->gp_egv = 0;
4571f4a7 2514 gp->gp_refcnt--;
c43ae56f 2515 GvGP_set(gv, NULL);
79072805 2516 return;
748a9306 2517 }
79072805 2518
b0d55c99
FC		 2519 while (1) {
2520 /* Copy and null out all the glob slots, so destructors do not see
2521 freed SVs. */
2522 HEK * const file_hek = gp->gp_file_hek;
2523 SV * const sv = gp->gp_sv;
2524 AV * const av = gp->gp_av;
2525 HV * const hv = gp->gp_hv;
2526 IO * const io = gp->gp_io;
2527 CV * const cv = gp->gp_cv;
2528 CV * const form = gp->gp_form;
2529
2530 gp->gp_file_hek = NULL;
2531 gp->gp_sv = NULL;
2532 gp->gp_av = NULL;
2533 gp->gp_hv = NULL;
2534 gp->gp_io = NULL;
2535 gp->gp_cv = NULL;
2536 gp->gp_form = NULL;
2537
2538 if (file_hek)
2539 unshare_hek(file_hek);
2540
2541 SvREFCNT_dec(sv);
2542 SvREFCNT_dec(av);
2543 /* FIXME - another reference loop GV -> symtab -> GV ?
2544 Somehow gp->gp_hv can end up pointing at freed garbage. */
2545 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2546 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC		 2547 if (PL_stashcache && hvname_hek) {
2548 DEBUG_o(Perl_deb(aTHX_
2549 "gp_free clearing PL_stashcache for '%"HEKf"'\n",
2550 HEKfARG(hvname_hek)));
0ca9877d 2551 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2552 }
b0d55c99
FC		 2553 SvREFCNT_dec(hv);
2554 }
96d7c888
FC		 2555 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2556 && (IoTYPE(io) == IoTYPE_WRONLY ||
2557 IoTYPE(io) == IoTYPE_RDWR ||
2558 IoTYPE(io) == IoTYPE_APPEND)
2559 && ckWARN_d(WARN_IO)
2560 && IoIFP(io) != PerlIO_stdin()
2561 && IoIFP(io) != PerlIO_stdout()
2562 && IoIFP(io) != PerlIO_stderr()
2563 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2564 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC		 2565 SvREFCNT_dec(io);
2566 SvREFCNT_dec(cv);
2567 SvREFCNT_dec(form);
2568
bc81b34d
FC		 2569 /* Possibly reallocated by a destructor */
2570 gp = GvGP(gv);
2571
b0d55c99
FC		 2572 if (!gp->gp_file_hek
2573 && !gp->gp_sv
2574 && !gp->gp_av
2575 && !gp->gp_hv
2576 && !gp->gp_io
2577 && !gp->gp_cv
2578 && !gp->gp_form) break;
2579
2580 if (--attempts == 0) {
2581 Perl_die(aTHX_
2582 "panic: gp_free failed to free glob pointer - "
2583 "something is repeatedly re-creating entries"
2584 );
2585 }
13207a71 2586 }
748a9306 2587
bc81b34d
FC		 2588 /* Possibly incremented by a destructor doing glob assignment */
2589 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2590 Safefree(gp);
c43ae56f 2591 GvGP_set(gv, NULL);
79072805
LW		 2592}
2593
d460ef45
NIS		 2594int
2595Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2596{
53c1dcc0
AL		 2597 AMT * const amtp = (AMT*)mg->mg_ptr;
2598 PERL_UNUSED_ARG(sv);
dd374669 2599
7918f24d
NC		 2600 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2601
d460ef45
NIS		 2602 if (amtp && AMT_AMAGIC(amtp)) {
2603 int i;
2604 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2605 CV * const cv = amtp->table[i];
b37c2d43 2606 if (cv) {
e7881358 2607 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2608 amtp->table[i] = NULL;
d460ef45
NIS		 2609 }
2610 }
2611 }
2612 return 0;
2613}
2614
a0d0e21e 2615/* Updates and caches the CV's */
c3a9a790
RGS		 2616/* Returns:
2617 * 1 on success and there is some overload
2618 * 0 if there is no overload
2619 * -1 if some error occurred and it couldn't croak
2620 */
a0d0e21e 2621
c3a9a790 2622int
242f8760 2623Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2624{
ad64d0ec 2625 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2626 AMT amt;
9b439311 2627 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2628 U32 newgen;
a0d0e21e 2629
7918f24d
NC		 2630 PERL_ARGS_ASSERT_GV_AMUPDATE;
2631
9b439311 2632 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2633 if (mg) {
2634 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2635 if (amtp->was_ok_sub == newgen) {
8c34e50d 2636 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2637 }
ad64d0ec 2638 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2639 }
a0d0e21e 2640
bfcb3514 2641 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2642
d460ef45 2643 Zero(&amt,1,AMT);
e1a479c5 2644 amt.was_ok_sub = newgen;
a6006777 2645 amt.fallback = AMGfallNO;
2646 amt.flags = 0;
2647
a6006777 2648 {
8c34e50d
FC		 2649 int filled = 0;
2650 int i;
3d147ac2
DM		 2651 bool deref_seen = 0;
2652
a6006777 2653
3866ea3b 2654 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2655
89ffc314 2656 /* Try to find via inheritance. */
e6919483 2657 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2658 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2659 CV* cv;
89ffc314
IZ		 2660
2661 if (!gv)
3866ea3b
FC		 2662 {
2663 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2664 goto no_table;
3866ea3b
FC		 2665 }
2666#ifdef PERL_DONT_CREATE_GVSV
2667 else if (!sv) {
6f207bd3 2668 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2669 }
2670#endif
79c9643d
JL		 2671 else if (SvTRUE(sv))
2672 /* don't need to set overloading here because fallback => 1
2673 * is the default setting for classes without overloading */
89ffc314 2674 amt.fallback=AMGfallYES;
79c9643d
JL		 2675 else if (SvOK(sv)) {
2676 amt.fallback=AMGfallNEVER;
386a5489 2677 filled = 1;
386a5489 2678 }
79c9643d 2679 else {
386a5489 2680 filled = 1;
386a5489 2681 }
a6006777 2682
3d147ac2 2683 assert(SvOOK(stash));
3d147ac2 2684 /* initially assume the worst */
339441ef 2685 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2686
8c34e50d 2687 for (i = 1; i < NofAMmeth; i++) {
6136c704 2688 const char * const cooky = PL_AMG_names[i];
32251b26 2689 /* Human-readable form, for debugging: */
8c34e50d 2690 const char * const cp = AMG_id2name(i);
d279ab82 2691 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2692
a0288114 2693 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2694 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2695 /* don't fill the cache while looking up!
2696 Creation of inheritance stubs in intermediate packages may
2697 conflict with the logic of runtime method substitution.
2698 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2699 then we could have created stubs for "(+0" in A and C too.
2700 But if B overloads "bool", we may want to use it for
2701 numifying instead of C's "+0". */
8c34e50d 2702 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2703 cv = 0;
c3ad4e54
FC		 2704 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2705 const HEK * const gvhek =
2706 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2707 const HEK * const stashek =
2708 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2709 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2710 && stashek && HEK_LEN(stashek) == 8
2711 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ		 2712 /* This is a hack to support autoloading..., while
2713 knowing *which* methods were declared as overloaded. */
44a8e56a 2714 /* GvSV contains the name of the method. */
6136c704 2715 GV *ngv = NULL;
c69033f2 2716 SV *gvsv = GvSV(gv);
a0288114
AL		 2717
2718 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2719 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2720 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2721 if (!gvsv || !SvPOK(gvsv)
7f415459 2722 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2723 {
a0288114 2724 /* Can be an import stub (created by "can"). */
242f8760 2725 if (destructing) {
c3a9a790 2726 return -1;
242f8760
RGS		 2727 }
2728 else {
d66cca07
BF		 2729 const SV * const name = (gvsv && SvPOK(gvsv))
2730 ? gvsv
2731 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2732 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2733 Perl_croak(aTHX_ "%s method \"%"SVf256
2734 "\" overloading \"%s\" "\
d0c0e7dd 2735 "in package \"%"HEKf256"\"",
242f8760
RGS		 2736 (GvCVGEN(gv) ? "Stub found while resolving"
2737 : "Can't resolve"),
d66cca07 2738 SVfARG(name), cp,
d0c0e7dd 2739 HEKfARG(
d66cca07 2740 HvNAME_HEK(stash)
d0c0e7dd 2741 ));
242f8760 2742 }
44a8e56a 2743 }
dc848c6f 2744 cv = GvCV(gv = ngv);
44a8e56a 2745 }
b464bac0 2746 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2747 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2748 GvNAME(CvGV(cv))) );
2749 filled = 1;
611c1e95 2750 } else if (gv) { /* Autoloaded... */
ea726b52 2751 cv = MUTABLE_CV(gv);
611c1e95 2752 filled = 1;
44a8e56a 2753 }
ea726b52 2754 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2755
2756 if (gv) {
2757 switch (i) {
2758 case to_sv_amg:
2759 case to_av_amg:
2760 case to_hv_amg:
2761 case to_gv_amg:
2762 case to_cv_amg:
2763 case nomethod_amg:
2764 deref_seen = 1;
2765 break;
2766 }
2767 }
a0d0e21e 2768 }
3d147ac2 2769 if (!deref_seen)
45479970
DM		 2770 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2771 * NB - aux var invalid here, HvARRAY() could have been
2772 * reallocated since it was assigned to */
2773 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2774
a0d0e21e 2775 if (filled) {
a6006777 2776 AMT_AMAGIC_on(&amt);
ad64d0ec 2777 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2778 (char*)&amt, sizeof(AMT));
8c34e50d 2779 return TRUE;
a0d0e21e
LW		 2780 }
2781 }
a6006777 2782 /* Here we have no table: */
8c34e50d 2783 no_table:
a6006777 2784 AMT_AMAGIC_off(&amt);
ad64d0ec 2785 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2786 (char*)&amt, sizeof(AMTS));
c3a9a790 2787 return 0;
a0d0e21e
LW		 2788}
2789
32251b26
IZ		 2790
2791CV*
2792Perl_gv_handler(pTHX_ HV *stash, I32 id)
2793{
3f8f4626 2794 MAGIC *mg;
32251b26 2795 AMT *amtp;
e1a479c5 2796 U32 newgen;
9b439311 2797 struct mro_meta* stash_meta;
32251b26 2798
bfcb3514 2799 if (!stash || !HvNAME_get(stash))
601f1833 2800 return NULL;
e1a479c5 2801
9b439311
BB		 2802 stash_meta = HvMROMETA(stash);
2803 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2804
ad64d0ec 2805 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2806 if (!mg) {
2807 do_update:
8c34e50d 2808 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2809 return NULL;
ad64d0ec 2810 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2811 }
a9fd4e40 2812 assert(mg);
32251b26 2813 amtp = (AMT*)mg->mg_ptr;
66978156 2814 if ( amtp->was_ok_sub != newgen )
32251b26 2815 goto do_update;
3ad83ce7 2816 if (AMT_AMAGIC(amtp)) {
b7787f18 2817 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2818 if (ret && isGV(ret)) { /* Autoloading stab */
2819 /* Passing it through may have resulted in a warning
2820 "Inherited AUTOLOAD for a non-method deprecated", since
2821 our caller is going through a function call, not a method call.
2822 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2823 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2824
2825 if (gv && GvCV(gv))
2826 return GvCV(gv);
2827 }
2828 return ret;
2829 }
a0288114 2830
601f1833 2831 return NULL;
32251b26
IZ		 2832}
2833
2834
6f1401dc
DM		 2835/* Implement tryAMAGICun_MG macro.
2836 Do get magic, then see if the stack arg is overloaded and if so call it.
2837 Flags:
2838 AMGf_set return the arg using SETs rather than assigning to
2839 the targ
2840 AMGf_numeric apply sv_2num to the stack arg.
2841*/
2842
2843bool
2844Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2845 dSP;
2846 SV* tmpsv;
2847 SV* const arg = TOPs;
2848
2849 SvGETMAGIC(arg);
2850
9f8bf298 2851 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC		 2852 AMGf_noright | AMGf_unary
2853 | (flags & AMGf_numarg))))
2854 {
6f1401dc
DM		 2855 if (flags & AMGf_set) {
2856 SETs(tmpsv);
2857 }
2858 else {
2859 dTARGET;
2860 if (SvPADMY(TARG)) {
2861 sv_setsv(TARG, tmpsv);
2862 SETTARG;
2863 }
2864 else
2865 SETs(tmpsv);
2866 }
2867 PUTBACK;
2868 return TRUE;
2869 }
2870
2871 if ((flags & AMGf_numeric) && SvROK(arg))
2872 *sp = sv_2num(arg);
2873 return FALSE;
2874}
2875
2876
2877/* Implement tryAMAGICbin_MG macro.
2878 Do get magic, then see if the two stack args are overloaded and if so
2879 call it.
2880 Flags:
2881 AMGf_set return the arg using SETs rather than assigning to
2882 the targ
2883 AMGf_assign op may be called as mutator (eg +=)
2884 AMGf_numeric apply sv_2num to the stack arg.
2885*/
2886
2887bool
2888Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 2889 dSP;
2890 SV* const left = TOPm1s;
2891 SV* const right = TOPs;
2892
2893 SvGETMAGIC(left);
2894 if (left != right)
2895 SvGETMAGIC(right);
2896
2897 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2898 SV * const tmpsv = amagic_call(left, right, method,
636ac8fc
FC		 2899 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0)
2900 | (flags & AMGf_numarg));
6f1401dc
DM		 2901 if (tmpsv) {
2902 if (flags & AMGf_set) {
2903 (void)POPs;
2904 SETs(tmpsv);
2905 }
2906 else {
2907 dATARGET;
2908 (void)POPs;
2909 if (opASSIGN || SvPADMY(TARG)) {
2910 sv_setsv(TARG, tmpsv);
2911 SETTARG;
2912 }
2913 else
2914 SETs(tmpsv);
2915 }
2916 PUTBACK;
2917 return TRUE;
2918 }
2919 }
75ea7a12
FC		 2920 if(left==right && SvGMAGICAL(left)) {
2921 SV * const left = sv_newmortal();
2922 *(sp-1) = left;
2923 /* Print the uninitialized warning now, so it includes the vari-
2924 able name. */
2925 if (!SvOK(right)) {
2926 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2927 sv_setsv_flags(left, &PL_sv_no, 0);
2928 }
2929 else sv_setsv_flags(left, right, 0);
2930 SvGETMAGIC(right);
2931 }
6f1401dc 2932 if (flags & AMGf_numeric) {
75ea7a12
FC		 2933 if (SvROK(TOPm1s))
2934 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2935 if (SvROK(right))
2936 *sp = sv_2num(right);
2937 }
2938 return FALSE;
2939}
2940
25a9ffce
NC		 2941SV *
2942Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2943 SV *tmpsv = NULL;
3d147ac2 2944 HV *stash;
25a9ffce
NC		 2945
2946 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2947
3d147ac2
DM		 2948 if (!SvAMAGIC(ref))
2949 return ref;
2950 /* return quickly if none of the deref ops are overloaded */
2951 stash = SvSTASH(SvRV(ref));
2952 assert(SvOOK(stash));
2953 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2954 return ref;
2955
2956 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 2957 AMGf_noright | AMGf_unary))) {
2958 if (!SvROK(tmpsv))
2959 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2960 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2961 /* Bail out if it returns us the same reference. */
2962 return tmpsv;
2963 }
2964 ref = tmpsv;
3d147ac2
DM		 2965 if (!SvAMAGIC(ref))
2966 break;
25a9ffce
NC		 2967 }
2968 return tmpsv ? tmpsv : ref;
2969}
6f1401dc 2970
8d569291
FC		 2971bool
2972Perl_amagic_is_enabled(pTHX_ int method)
2973{
2974 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2975
2976 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2977
2978 if ( !lex_mask || !SvOK(lex_mask) )
2979 /* overloading lexically disabled */
2980 return FALSE;
2981 else if ( lex_mask && SvPOK(lex_mask) ) {
2982 /* we have an entry in the hints hash, check if method has been
2983 * masked by overloading.pm */
2984 STRLEN len;
2985 const int offset = method / 8;
2986 const int bit = method % 8;
2987 char *pv = SvPV(lex_mask, len);
2988
2989 /* Bit set, so this overloading operator is disabled */
2990 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2991 return FALSE;
2992 }
2993 return TRUE;
2994}
2995
a0d0e21e 2996SV*
864dbfa3 2997Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2998{
27da23d5 2999 dVAR;
b267980d 3000 MAGIC *mg;
9c5ffd7c 3001 CV *cv=NULL;
a0d0e21e 3002 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3003 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 3004 int off = 0, off1, lr = 0, notfound = 0;
3005 int postpr = 0, force_cpy = 0;
3006 int assign = AMGf_assign & flags;
3007 const int assignshift = assign ? 1 : 0;
bf5522a1 3008 int use_default_op = 0;
67288365 3009 int force_scalar = 0;
497b47a8
JH		 3010#ifdef DEBUGGING
3011 int fl=0;
497b47a8 3012#endif
25716404 3013 HV* stash=NULL;
7918f24d
NC		 3014
3015 PERL_ARGS_ASSERT_AMAGIC_CALL;
3016
e46c382e 3017 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3018 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 3019 }
3020
a0d0e21e 3021 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3022 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3023 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3024 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3025 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3026 : NULL))
b267980d 3027 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 3028 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3029 * usual method */
497b47a8
JH		 3030 (
3031#ifdef DEBUGGING
3032 fl = 1,
a0288114 3033#endif
497b47a8 3034 cv = cvp[off=method])))) {
a0d0e21e
LW		 3035 lr = -1; /* Call method for left argument */
3036 } else {
3037 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3038 int logic;
3039
3040 /* look for substituted methods */
ee239bfe 3041 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 3042 switch (method) {
3043 case inc_amg:
ee239bfe
IZ		 3044 force_cpy = 1;
3045 if ((cv = cvp[off=add_ass_amg])
3046 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3047 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3048 }
3049 break;
3050 case dec_amg:
ee239bfe
IZ		 3051 force_cpy = 1;
3052 if ((cv = cvp[off = subtr_ass_amg])
3053 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3054 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3055 }
3056 break;
3057 case bool__amg:
3058 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3059 break;
3060 case numer_amg:
3061 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3062 break;
3063 case string_amg:
3064 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3065 break;
b7787f18
AL		 3066 case not_amg:
3067 (void)((cv = cvp[off=bool__amg])
3068 || (cv = cvp[off=numer_amg])
3069 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 3070 if (cv)
3071 postpr = 1;
b7787f18 3072 break;
748a9306
LW		 3073 case copy_amg:
3074 {
76e3520e
GS		 3075 /*
3076 * SV* ref causes confusion with the interpreter variable of
3077 * the same name
3078 */
890ce7af 3079 SV* const tmpRef=SvRV(left);
76e3520e 3080 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 3081 /*
3082 * Just to be extra cautious. Maybe in some
3083 * additional cases sv_setsv is safe, too.
3084 */
890ce7af 3085 SV* const newref = newSVsv(tmpRef);
748a9306 3086 SvOBJECT_on(newref);
a1cd65be
FC		 3087 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3088 delegate to the stash. */
85fbaab2 3089 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 3090 return newref;
3091 }
3092 }
3093 break;
a0d0e21e 3094 case abs_amg:
b267980d 3095 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3096 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3097 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3098 if (off1==lt_amg) {
890ce7af 3099 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3100 lt_amg,AMGf_noright);
3101 logic = SvTRUE(lessp);
3102 } else {
890ce7af 3103 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3104 ncmp_amg,AMGf_noright);
3105 logic = (SvNV(lessp) < 0);
3106 }
3107 if (logic) {
3108 if (off==subtr_amg) {
3109 right = left;
748a9306 3110 left = nullsv;
a0d0e21e
LW		 3111 lr = 1;
3112 }
3113 } else {
3114 return left;
3115 }
3116 }
3117 break;
3118 case neg_amg:
155aba94 3119 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 3120 right = left;
3121 left = sv_2mortal(newSViv(0));
3122 lr = 1;
3123 }
3124 break;
f216259d 3125 case int_amg:
f5284f61 3126 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3127 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3128 case regexp_amg:
b267980d
NIS		 3129 /* FAIL safe */
3130 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3131
f5284f61
IZ		 3132 case to_sv_amg:
3133 case to_av_amg:
3134 case to_hv_amg:
3135 case to_gv_amg:
3136 case to_cv_amg:
3137 /* FAIL safe */
b267980d 3138 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3139
a0d0e21e
LW		 3140 default:
3141 goto not_found;
3142 }
3143 if (!cv) goto not_found;
3144 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3145 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3146 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3147 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3148 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3149 : NULL))
69815d08
RS		 3150 && (cv = cvp[off=method])) { /* Method for right
3151 * argument found */
3152 lr=1;
bf5522a1
MB		 3153 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3154 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 3155 && !(flags & AMGf_unary)) {
3156 /* We look for substitution for
3157 * comparison operations and
fc36a67e 3158 * concatenation */
a0d0e21e
LW		 3159 if (method==concat_amg || method==concat_ass_amg
3160 || method==repeat_amg || method==repeat_ass_amg) {
3161 return NULL; /* Delegate operation to string conversion */
3162 }
3163 off = -1;
3164 switch (method) {
3165 case lt_amg:
3166 case le_amg:
3167 case gt_amg:
3168 case ge_amg:
3169 case eq_amg:
3170 case ne_amg:
2ab54efd
MB		 3171 off = ncmp_amg;
3172 break;
a0d0e21e
LW		 3173 case slt_amg:
3174 case sle_amg:
3175 case sgt_amg:
3176 case sge_amg:
3177 case seq_amg:
3178 case sne_amg:
2ab54efd
MB		 3179 off = scmp_amg;
3180 break;
a0d0e21e 3181 }
bf5522a1
MB		 3182 if (off != -1) {
3183 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3184 cv = ocvp[off];
3185 lr = -1;
3186 }
3187 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3188 cv = cvp[off];
3189 lr = 1;
3190 }
3191 }
3192 if (cv)
2ab54efd
MB		 3193 postpr = 1;
3194 else
3195 goto not_found;
a0d0e21e 3196 } else {
a6006777 3197 not_found: /* No method found, either report or croak */
b267980d
NIS		 3198 switch (method) {
3199 case to_sv_amg:
3200 case to_av_amg:
3201 case to_hv_amg:
3202 case to_gv_amg:
3203 case to_cv_amg:
3204 /* FAIL safe */
3205 return left; /* Delegate operation to standard mechanisms. */
b267980d 3206 }
a0d0e21e
LW		 3207 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3208 notfound = 1; lr = -1;
3209 } else if (cvp && (cv=cvp[nomethod_amg])) {
3210 notfound = 1; lr = 1;
bf5522a1
MB		 3211 } else if ((use_default_op =
3212 (!ocvp || oamtp->fallback >= AMGfallYES)
3213 && (!cvp || amtp->fallback >= AMGfallYES))
3214 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3215 /* Skip generating the "no method found" message. */
3216 return NULL;
a0d0e21e 3217 } else {
46fc3d4c 3218 SV *msg;
774d564b 3219 if (off==-1) off=method;
b267980d 3220 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3221 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3222 AMG_id2name(method + assignshift),
3223 (flags & AMGf_unary ? " " : "\n\tleft "),
3224 SvAMAGIC(left)?
3225 "in overloaded package ":
3226 "has no overloaded magic",
3227 SvAMAGIC(left)?
3228 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3229 SVfARG(&PL_sv_no),
3230 SvAMAGIC(right)?
3231 ",\n\tright argument in overloaded package ":
3232 (flags & AMGf_unary
3233 ? ""
3234 : ",\n\tright argument has no overloaded magic"),
3235 SvAMAGIC(right)?
3236 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3237 SVfARG(&PL_sv_no)));
bf5522a1 3238 if (use_default_op) {
d66cca07 3239 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3240 } else {
be2597df 3241 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3242 }
3243 return NULL;
3244 }
ee239bfe 3245 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3246 }
3247 }
67288365
JL		 3248
3249 switch (method) {
3250 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3251 * operation. we need this to return a value, so that it can be assigned
3252 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3253 * increment or decrement was itself called in void context */
3254 case inc_amg:
3255 if (off == add_amg)
3256 force_scalar = 1;
3257 break;
3258 case dec_amg:
3259 if (off == subtr_amg)
3260 force_scalar = 1;
3261 break;
3262 /* in these cases, we're calling an assignment variant of an operator
3263 * (+= rather than +, for instance). regardless of whether it's a
3264 * fallback or not, it always has to return a value, which will be
3265 * assigned to the proper variable later */
3266 case add_amg:
3267 case subtr_amg:
3268 case mult_amg:
3269 case div_amg:
3270 case modulo_amg:
3271 case pow_amg:
3272 case lshift_amg:
3273 case rshift_amg:
3274 case repeat_amg:
3275 case concat_amg:
3276 case band_amg:
3277 case bor_amg:
3278 case bxor_amg:
6d06ecce
FC		 3279 case sband_amg:
3280 case sbor_amg:
3281 case sbxor_amg:
67288365
JL		 3282 if (assign)
3283 force_scalar = 1;
3284 break;
3285 /* the copy constructor always needs to return a value */
3286 case copy_amg:
3287 force_scalar = 1;
3288 break;
3289 /* because of the way these are implemented (they don't perform the
3290 * dereferencing themselves, they return a reference that perl then
3291 * dereferences later), they always have to be in scalar context */
3292 case to_sv_amg:
3293 case to_av_amg:
3294 case to_hv_amg:
3295 case to_gv_amg:
3296 case to_cv_amg:
3297 force_scalar = 1;
3298 break;
3299 /* these don't have an op of their own; they're triggered by their parent
3300 * op, so the context there isn't meaningful ('$a and foo()' in void
3301 * context still needs to pass scalar context on to $a's bool overload) */
3302 case bool__amg:
3303 case numer_amg:
3304 case string_amg:
3305 force_scalar = 1;
3306 break;
3307 }
3308
497b47a8 3309#ifdef DEBUGGING
a0d0e21e 3310 if (!notfound) {
497b47a8 3311 DEBUG_o(Perl_deb(aTHX_
d66cca07 3312 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3313 AMG_id2name(off),
3314 method+assignshift==off? "" :
a0288114 3315 " (initially \"",
497b47a8
JH		 3316 method+assignshift==off? "" :
3317 AMG_id2name(method+assignshift),
a0288114 3318 method+assignshift==off? "" : "\")",
497b47a8
JH		 3319 flags & AMGf_unary? "" :
3320 lr==1 ? " for right argument": " for left argument",
3321 flags & AMGf_unary? " for argument" : "",
d66cca07 3322 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3323 fl? ",\n\tassignment variant used": "") );
ee239bfe 3324 }
497b47a8 3325#endif
748a9306
LW		 3326 /* Since we use shallow copy during assignment, we need
3327 * to dublicate the contents, probably calling user-supplied
3328 * version of copy operator
3329 */
ee239bfe
IZ		 3330 /* We need to copy in following cases:
3331 * a) Assignment form was called.
3332 * assignshift==1, assign==T, method + 1 == off
3333 * b) Increment or decrement, called directly.
3334 * assignshift==0, assign==0, method + 0 == off
3335 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3336 * assignshift==0, assign==T,
ee239bfe
IZ		 3337 * force_cpy == T
3338 * d) Increment or decrement, translated to nomethod.
b267980d 3339 * assignshift==0, assign==0,
ee239bfe
IZ		 3340 * force_cpy == T
3341 * e) Assignment form translated to nomethod.
3342 * assignshift==1, assign==T, method + 1 != off
3343 * force_cpy == T
3344 */
3345 /* off is method, method+assignshift, or a result of opcode substitution.
3346 * In the latter case assignshift==0, so only notfound case is important.
3347 */
73512201 3348 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3349 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3350 || force_cpy) )
6f1401dc 3351 {
1b38c28e
NC		 3352 /* newSVsv does not behave as advertised, so we copy missing
3353 * information by hand */
3354 SV *tmpRef = SvRV(left);
3355 SV *rv_copy;
31d632c3 3356 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3357 SvRV_set(left, rv_copy);
3358 SvSETMAGIC(left);
e7881358 3359 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3360 }
6f1401dc
DM		 3361 }
3362
a0d0e21e
LW		 3363 {
3364 dSP;
3365 BINOP myop;
3366 SV* res;
b7787f18 3367 const bool oldcatch = CATCH_GET;
67288365 3368 I32 oldmark, nret;
1c23e2bd 3369 U8 gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3370
54310121 3371 CATCH_SET(TRUE);
a0d0e21e
LW		 3372 Zero(&myop, 1, BINOP);
3373 myop.op_last = (OP *) &myop;
b37c2d43 3374 myop.op_next = NULL;
67288365
JL		 3375 myop.op_flags = OPf_STACKED;
3376
3377 switch (gimme) {
3378 case G_VOID:
3379 myop.op_flags |= OPf_WANT_VOID;
3380 break;
3381 case G_ARRAY:
3382 if (flags & AMGf_want_list) {
3383 myop.op_flags |= OPf_WANT_LIST;
3384 break;
3385 }
3386 /* FALLTHROUGH */
3387 default:
3388 myop.op_flags |= OPf_WANT_SCALAR;
3389 break;
3390 }
a0d0e21e 3391
e788e7d3 3392 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3393 ENTER;
462e5cf6 3394 SAVEOP();
533c011a 3395 PL_op = (OP *) &myop;
3280af22 3396 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3397 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3398 Perl_pp_pushmark(aTHX);
a0d0e21e 3399
924508f0 3400 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3401 PUSHs(lr>0? right: left);
3402 PUSHs(lr>0? left: right);
3280af22 3403 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3404 if (notfound) {
59cd0e26
NC		 3405 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3406 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3407 }
636ac8fc
FC		 3408 else if (flags & AMGf_numarg)
3409 PUSHs(&PL_sv_undef);
3410 if (flags & AMGf_numarg)
3411 PUSHs(&PL_sv_yes);
ad64d0ec 3412 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3413 PUTBACK;
67288365 3414 oldmark = TOPMARK;
a0d0e21e 3415
139d0ce6 3416 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3417 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3418 LEAVE;
3419 SPAGAIN;
67288365
JL		 3420 nret = SP - (PL_stack_base + oldmark);
3421
3422 switch (gimme) {
3423 case G_VOID:
3424 /* returning NULL has another meaning, and we check the context
3425 * at the call site too, so this can be differentiated from the
3426 * scalar case */
3427 res = &PL_sv_undef;
3428 SP = PL_stack_base + oldmark;
3429 break;
3430 case G_ARRAY: {
3431 if (flags & AMGf_want_list) {
3432 res = sv_2mortal((SV *)newAV());
3433 av_extend((AV *)res, nret);
3434 while (nret--)
3435 av_store((AV *)res, nret, POPs);
3436 break;
3437 }
3438 /* FALLTHROUGH */
3439 }
3440 default:
3441 res = POPs;
3442 break;
3443 }
a0d0e21e 3444
ebafeae7 3445 PUTBACK;
d3acc0f7 3446 POPSTACK;
54310121 3447 CATCH_SET(oldcatch);
a0d0e21e 3448
a0d0e21e 3449 if (postpr) {
b7787f18 3450 int ans;
a0d0e21e
LW		 3451 switch (method) {
3452 case le_amg:
3453 case sle_amg:
3454 ans=SvIV(res)<=0; break;
3455 case lt_amg:
3456 case slt_amg:
3457 ans=SvIV(res)<0; break;
3458 case ge_amg:
3459 case sge_amg:
3460 ans=SvIV(res)>=0; break;
3461 case gt_amg:
3462 case sgt_amg:
3463 ans=SvIV(res)>0; break;
3464 case eq_amg:
3465 case seq_amg:
3466 ans=SvIV(res)==0; break;
3467 case ne_amg:
3468 case sne_amg:
3469 ans=SvIV(res)!=0; break;
3470 case inc_amg:
3471 case dec_amg:
bbce6d69 3472 SvSetSV(left,res); return left;
dc437b57 3473 case not_amg:
fe7ac86a 3474 ans=!SvTRUE(res); break;
b7787f18
AL		 3475 default:
3476 ans=0; break;
a0d0e21e 3477 }
54310121 3478 return boolSV(ans);
748a9306
LW		 3479 } else if (method==copy_amg) {
3480 if (!SvROK(res)) {
cea2e8a9 3481 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3482 }
3483 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3484 } else {
3485 return res;
3486 }
3487 }
3488}
c9d5ac95 3489
f5c1e807
NC		 3490void
3491Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3492{
3493 dVAR;
acda4c6a 3494 U32 hash;
f5c1e807 3495
7918f24d 3496 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3497
acda4c6a
NC		 3498 if (len > I32_MAX)
3499 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3500
ae8cc45f
NC		 3501 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3502 unshare_hek(GvNAME_HEK(gv));
3503 }
3504
acda4c6a 3505 PERL_HASH(hash, name, len);
c60dbbc3 3506 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3507}
3508
66610fdd 3509/*
f7461760
Z		 3510=for apidoc gv_try_downgrade
3511
2867cdbc
Z		 3512If the typeglob C<gv> can be expressed more succinctly, by having
3513something other than a real GV in its place in the stash, replace it
3514with the optimised form. Basic requirements for this are that C<gv>
3515is a real typeglob, is sufficiently ordinary, and is only referenced
3516from its package. This function is meant to be used when a GV has been
3517looked up in part to see what was there, causing upgrading, but based
3518on what was found it turns out that the real GV isn't required after all.
3519
3520If C<gv> is a completely empty typeglob, it is deleted from the stash.
3521
3522If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3523sub, the typeglob is replaced with a scalar-reference placeholder that
3524more compactly represents the same thing.
f7461760
Z		 3525
3526=cut
3527*/
3528
3529void
3530Perl_gv_try_downgrade(pTHX_ GV *gv)
3531{
3532 HV *stash;
3533 CV *cv;
3534 HEK *namehek;
3535 SV **gvp;
3536 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3537
3538 /* XXX Why and where does this leave dangling pointers during global
3539 destruction? */
627364f1 3540 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3541
2867cdbc 3542 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3543 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3544 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3545 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3546 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3547 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3548 return;
2be08ad1
FC		 3549 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3550 return;
803f2748
DM		 3551 if (SvMAGICAL(gv)) {
3552 MAGIC *mg;
3553 /* only backref magic is allowed */
3554 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3555 return;
3556 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3557 if (mg->mg_type != PERL_MAGIC_backref)
3558 return;
3559 }
3560 }
2867cdbc
Z		 3561 cv = GvCV(gv);
3562 if (!cv) {
3563 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3564 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3565 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3566 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3567 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z		 3568 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3569 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3570 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3571 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3572 *gvp == (SV*)gv) {
3573 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3574 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3575 SvREFCNT(gv) = 0;
3576 sv_clear((SV*)gv);
3577 SvREFCNT(gv) = 1;
70e5f2b5 3578 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH		 3579
3580 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z		 3581 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3582 STRUCT_OFFSET(XPVIV, xiv_iv));
3583 SvRV_set(gv, value);
3584 }
3585}
3586
9e3fb20c
FC		 3587GV *
3588Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3589{
3590 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3591 GV * const *gvp;
3592 PERL_ARGS_ASSERT_GV_OVERRIDE;
3593 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3594 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3595 gv = gvp ? *gvp : NULL;
3596 if (gv && !isGV(gv)) {
3597 if (!SvPCS_IMPORTED(gv)) return NULL;
3598 gv_init(gv, PL_globalstash, name, len, 0);
3599 return gv;
3600 }
3601 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3602}
3603
4aaa4757
FC		 3604#include "XSUB.h"
3605
3606static void
3607core_xsub(pTHX_ CV* cv)
3608{
3609 Perl_croak(aTHX_
3610 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3611 );
3612}
3613
f7461760 3614/*
14d04a33 3615 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3616 */
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