This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
https://perl5.git.perl.org / perl5.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
infnan: more tests.
[perl5.git] / gv.c
CommitLineData
a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW		 9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW		 14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW		 20 */
21
ccfc67b7
JH		 22/*
23=head1 GV Functions
166f8a29
DM		 24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH		 32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
8261f8eb 37#include "overload.c"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a
AL		 41static const char S_autoload[] = "AUTOLOAD";
42static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 43
c69033f2 44GV *
d5713896 45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13be902c
FC		 49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
53 && SvTYPE((const SV *)gv) != SVt_PVLV
54 )
55 ) {
bb85b28a
NC		 56 const char *what;
57 if (type == SVt_PVIO) {
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";
bb85b28a
NC		 64 } else if (type == SVt_PVHV) {
65 what = "hash";
66 } else {
67 what = type == SVt_PVAV ? "array" : "scalar";
68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC		 70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896
NC		 72
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
bb85b28a
NC		 77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
d5713896
NC		 79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
d5713896 83 if (!*where)
e17aed30 84 {
d5713896 85 *where = newSV_type(type);
e17aed30
FC		 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);
89 }
79072805
LW		 90 return gv;
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 }
5a9a79a4 132 if ((PERLDB_LINE || PERLDB_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
145NULL.
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));
6f1b3ab0 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? 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);
237 CvNAMED_off(cv);
f3feca7a 238 CvLEXICAL_off(cv);
db5cc3ee 239 }
803f2748 240
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
307overwriting it as happens with typeglobs created by SvSetSV. Converting
308any scalar that is SvOK() may produce unpredictable results and is reserved
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
04ec7e59
FC		 321C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
322the return value of SvUTF8(sv). It can also take the
323GV_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
328The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC		 329has no flags parameter. If the C<multi> parameter is set, the
330GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC		 331
332=for apidoc gv_init_pv
333
334Same as gv_init_pvn(), but takes a nul-terminated string for the name
335instead of separate char * and length parameters.
336
337=for apidoc gv_init_sv
338
339Same as gv_init_pvn(), but takes an SV * for the name instead of separate
340char * and length parameters. C<flags> is currently unused.
341
342=cut
343*/
344
463ee0b2 345void
04ec7e59 346Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF		 347{
348 char *namepv;
349 STRLEN namelen;
350 PERL_ARGS_ASSERT_GV_INIT_SV;
351 namepv = SvPV(namesv, namelen);
352 if (SvUTF8(namesv))
353 flags |= SVf_UTF8;
04ec7e59 354 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF		 355}
356
357void
04ec7e59 358Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF		 359{
360 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 361 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF		 362}
363
364void
04ec7e59 365Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 366{
3b6733bf
NC		 367 const U32 old_type = SvTYPE(gv);
368 const bool doproto = old_type > SVt_NULL;
f9509170 369 char * const proto = (doproto && SvPOK(gv))
dad95a0a 370 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 371 : NULL;
49a54bbe 372 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 373 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 374 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 375 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 376
e6066781 377 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC		 378 assert (!(proto && has_constant));
379
380 if (has_constant) {
2eaf799e 381 /* The constant has to be a scalar, array or subroutine. */
5c1f4d79 382 switch (SvTYPE(has_constant)) {
5c1f4d79 383 case SVt_PVHV:
5c1f4d79
NC		 384 case SVt_PVFM:
385 case SVt_PVIO:
386 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
387 sv_reftype(has_constant, 0));
81d52ecd 388
42d0e0b7 389 default: NOOP;
5c1f4d79 390 }
756cb477
NC		 391 SvRV_set(gv, NULL);
392 SvROK_off(gv);
393 }
463ee0b2 394
3b6733bf
NC		 395
396 if (old_type < SVt_PVGV) {
397 if (old_type >= SVt_PV)
398 SvCUR_set(gv, 0);
ad64d0ec 399 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 400 }
55d729e4
GS		 401 if (SvLEN(gv)) {
402 if (proto) {
f880fe2f 403 SvPV_set(gv, NULL);
b162af07 404 SvLEN_set(gv, 0);
55d729e4
GS		 405 SvPOK_off(gv);
406 } else
94010e71 407 Safefree(SvPVX_mutable(gv));
55d729e4 408 }
2e5b91de
NC		 409 SvIOK_off(gv);
410 isGV_with_GP_on(gv);
12816592 411
c43ae56f 412 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC		 413 GvSTASH(gv) = stash;
414 if (stash)
ad64d0ec 415 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 416 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 417 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
418 GvMULTI_on(gv); /* _was_ mentioned */
2eaf799e
FC		 419 if (has_constant && SvTYPE(has_constant) == SVt_PVCV) {
420 /* Not actually a constant. Just a regular sub. */
421 CV * const cv = (CV *)has_constant;
422 GvCV_set(gv,cv);
423 if (CvSTASH(cv) == stash && (
424 CvNAME_HEK(cv) == GvNAME_HEK(gv)
425 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
426 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
427 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
428 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
429 )
430 ))
431 CvGV_set(cv,gv);
432 }
433 else if (doproto) {
e3d2b9e7 434 CV *cv;
756cb477
NC		 435 if (has_constant) {
436 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 437 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 438 /* In case op.c:S_process_special_blocks stole it: */
439 if (!GvCV(gv))
c43ae56f 440 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 441 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 442 /* If this reference was a copy of another, then the subroutine
443 must have been "imported", by a Perl space assignment to a GV
444 from a reference to CV. */
445 if (exported_constant)
446 GvIMPORTED_CV_on(gv);
186a5ba8 447 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 448 } else {
186a5ba8 449 cv = newSTUB(gv,1);
756cb477 450 }
55d729e4 451 if (proto) {
e3d2b9e7 452 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 453 SV_HAS_TRAILING_NUL);
e0260a5b 454 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 455 }
456 }
463ee0b2
LW		 457}
458
76e3520e 459STATIC void
e6066781 460S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 461{
e6066781 462 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 463
a0d0e21e
LW		 464 switch (sv_type) {
465 case SVt_PVIO:
466 (void)GvIOn(gv);
467 break;
468 case SVt_PVAV:
469 (void)GvAVn(gv);
470 break;
471 case SVt_PVHV:
472 (void)GvHVn(gv);
473 break;
c69033f2
NC		 474#ifdef PERL_DONT_CREATE_GVSV
475 case SVt_NULL:
476 case SVt_PVCV:
477 case SVt_PVFM:
e654831b 478 case SVt_PVGV:
c69033f2
NC		 479 break;
480 default:
dbdce04c
NC		 481 if(GvSVn(gv)) {
482 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
483 If we just cast GvSVn(gv) to void, it ignores evaluating it for
484 its side effect */
485 }
c69033f2 486#endif
a0d0e21e
LW		 487 }
488}
489
0f8d4b5e
FC		 490static void core_xsub(pTHX_ CV* cv);
491
492static GV *
493S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 494 const char * const name, const STRLEN len)
0f8d4b5e
FC		 495{
496 const int code = keyword(name, len, 1);
497 static const char file[] = __FILE__;
97021f77 498 CV *cv, *oldcompcv = NULL;
0f8d4b5e 499 int opnum = 0;
0f8d4b5e 500 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 501 COP *oldcurcop = NULL;
502 yy_parser *oldparser = NULL;
503 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 504
505 assert(gv || stash);
506 assert(name);
0f8d4b5e 507
88b892d8
FC		 508 if (!code) return NULL; /* Not a keyword */
509 switch (code < 0 ? -code : code) {
0f8d4b5e 510 /* no support for \&CORE::infix;
d885f758 511 no support for funcs that do not parse like funcs */
88b892d8 512 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 513 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 514 case KEY_default : case KEY_DESTROY:
88b892d8 515 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 516 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 517 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 518 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC		 519 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
520 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
521 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 522 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 523 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 524 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 525 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 526 case KEY_state: case KEY_sub :
46bef06f 527 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC		 528 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
529 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 530 return NULL;
531 case KEY_chdir:
eb31eb35 532 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 533 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC		 534 case KEY_keys:
535 case KEY_lstat:
536 case KEY_pop:
537 case KEY_push:
538 case KEY_shift:
a99f2ca2 539 case KEY_splice: case KEY_split:
0f8d4b5e
FC		 540 case KEY_stat:
541 case KEY_system:
542 case KEY_truncate: case KEY_unlink:
543 case KEY_unshift:
544 case KEY_values:
545 ampable = FALSE;
546 }
547 if (!gv) {
548 gv = (GV *)newSV(0);
549 gv_init(gv, stash, name, len, TRUE);
550 }
7e68c38b 551 GvMULTI_on(gv);
0f8d4b5e
FC		 552 if (ampable) {
553 ENTER;
554 oldcurcop = PL_curcop;
555 oldparser = PL_parser;
556 lex_start(NULL, NULL, 0);
557 oldcompcv = PL_compcv;
558 PL_compcv = NULL; /* Prevent start_subparse from setting
559 CvOUTSIDE. */
560 oldsavestack_ix = start_subparse(FALSE,0);
561 cv = PL_compcv;
562 }
563 else {
564 /* Avoid calling newXS, as it calls us, and things start to
565 get hairy. */
566 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
567 GvCV_set(gv,cv);
568 GvCVGEN(gv) = 0;
0f8d4b5e
FC		 569 CvISXSUB_on(cv);
570 CvXSUB(cv) = core_xsub;
571 }
572 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
573 from PL_curcop. */
574 (void)gv_fetchfile(file);
575 CvFILE(cv) = (char *)file;
576 /* XXX This is inefficient, as doing things this order causes
577 a prototype check in newATTRSUB. But we have to do
578 it this order as we need an op number before calling
579 new ATTRSUB. */
580 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 581 if (stash)
73c02f15 582 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 583 if (ampable) {
4428fb0e
TC		 584#ifdef DEBUGGING
585 CV *orig_cv = cv;
586#endif
0f8d4b5e 587 CvLVALUE_on(cv);
4428fb0e
TC		 588 /* newATTRSUB will free the CV and return NULL if we're still
589 compiling after a syntax error */
e8f91c91 590 if ((cv = newATTRSUB_x(
7e68c38b 591 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 592 NULL,NULL,
593 coresub_op(
594 opnum
595 ? newSVuv((UV)opnum)
596 : newSVpvn(name,len),
597 code, opnum
7e68c38b 598 ),
e8f91c91 599 TRUE
4428fb0e
TC		 600 )) != NULL) {
601 assert(GvCV(gv) == orig_cv);
602 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
603 && opnum != OP_UNDEF)
604 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
605 }
0f8d4b5e
FC		 606 LEAVE;
607 PL_parser = oldparser;
608 PL_curcop = oldcurcop;
609 PL_compcv = oldcompcv;
610 }
4428fb0e
TC		 611 if (cv) {
612 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
613 cv_set_call_checker(
614 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
615 );
616 SvREFCNT_dec(opnumsv);
617 }
618
0f8d4b5e
FC		 619 return gv;
620}
621
954c1994 622/*
6c53d59b
FC		 623=for apidoc gv_fetchmeth
624
625Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
626
e6919483
BF		 627=for apidoc gv_fetchmeth_sv
628
629Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
630of an SV instead of a string/length pair.
631
632=cut
633*/
634
635GV *
636Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
637{
638 char *namepv;
639 STRLEN namelen;
640 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
641 namepv = SvPV(namesv, namelen);
642 if (SvUTF8(namesv))
643 flags |= SVf_UTF8;
644 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
645}
646
647/*
648=for apidoc gv_fetchmeth_pv
649
650Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
651instead of a string/length pair.
652
653=cut
654*/
655
656GV *
657Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
658{
659 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
660 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
661}
662
663/*
664=for apidoc gv_fetchmeth_pvn
954c1994
GS		 665
666Returns the glob with the given C<name> and a defined subroutine or
667C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 668accessible via @ISA and UNIVERSAL::.
954c1994
GS		 669
670The argument C<level> should be either 0 or -1. If C<level==0>, as a
671side-effect creates a glob with the given C<name> in the given C<stash>
672which in the case of success contains an alias for the subroutine, and sets
e1a479c5 673up caching info for this glob.
954c1994 674
aae43805
FC		 675The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
676
677GV_SUPER indicates that we want to look up the method in the superclasses
678of the C<stash>.
e6919483 679
aae43805 680The
954c1994 681GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 682visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 683the GV directly; instead, you should use the method's CV, which can be
b267980d 684obtained from the GV with the C<GvCV> macro.
954c1994
GS		 685
686=cut
687*/
688
e1a479c5
BB		 689/* NOTE: No support for tied ISA */
690
79072805 691GV *
e6919483 692Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 693{
463ee0b2 694 GV** gvp;
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;
e1a479c5
BB		 703 I32 create = (level >= 0) ? 1 : 0;
704 I32 items;
e1a479c5 705 U32 topgen_cmp;
04f3bf56 706 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 707
e6919483 708 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 709
af09ea45
IK		 710 /* UNIVERSAL methods should be callable without a stash */
711 if (!stash) {
e1a479c5 712 create = 0; /* probably appropriate */
da51bb9b 713 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 714 return 0;
715 }
716
e1a479c5
BB		 717 assert(stash);
718
bfcb3514
NC		 719 hvname = HvNAME_get(stash);
720 if (!hvname)
e1a479c5 721 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 722
e1a479c5
BB		 723 assert(hvname);
724 assert(name);
463ee0b2 725
aae43805
FC		 726 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
727 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
44a8e56a 728
dd69841b 729 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 730
aae43805 731 if (flags & GV_SUPER) {
1a33a059
FC		 732 if (!HvAUX(stash)->xhv_mro_meta->super)
733 HvAUX(stash)->xhv_mro_meta->super = newHV();
734 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC		 735 }
736 else cachestash = stash;
737
e1a479c5 738 /* check locally for a real method or a cache entry */
aae43805
FC		 739 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
740 create);
e1a479c5
BB		 741 if(gvp) {
742 topgv = *gvp;
0f8d4b5e 743 have_gv:
e1a479c5
BB		 744 assert(topgv);
745 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 746 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 747 if ((cand_cv = GvCV(topgv))) {
748 /* If genuine method or valid cache entry, use it */
749 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
750 return topgv;
751 }
752 else {
753 /* stale cache entry, junk it and move on */
e7881358 754 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 755 GvCV_set(topgv, NULL);
756 cand_cv = NULL;
e1a479c5
BB		 757 GvCVGEN(topgv) = 0;
758 }
759 }
760 else if (GvCVGEN(topgv) == topgen_cmp) {
761 /* cache indicates no such method definitively */
762 return 0;
763 }
aae43805
FC		 764 else if (stash == cachestash
765 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 766 && strnEQ(hvname, "CORE", 4)
87566176 767 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 768 goto have_gv;
463ee0b2 769 }
79072805 770
aae43805 771 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 772 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
773 items = AvFILLp(linear_av); /* no +1, to skip over self */
774 while (items--) {
775 linear_sv = *linear_svp++;
776 assert(linear_sv);
777 cstash = gv_stashsv(linear_sv, 0);
778
dd69841b 779 if (!cstash) {
ecad31f0 780 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 781 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 782 SVfARG(linear_sv),
d0c0e7dd 783 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 784 continue;
785 }
9607fc9c 786
e1a479c5
BB		 787 assert(cstash);
788
c60dbbc3 789 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 790 if (!gvp) {
791 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
792 const char *hvname = HvNAME(cstash); assert(hvname);
793 if (strnEQ(hvname, "CORE", 4)
794 && (candidate =
87566176 795 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 796 ))
797 goto have_candidate;
798 }
799 continue;
800 }
801 else candidate = *gvp;
802 have_candidate:
e1a479c5 803 assert(candidate);
04f3bf56 804 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 805 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 806 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
807 /*
808 * Found real method, cache method in topgv if:
809 * 1. topgv has no synonyms (else inheritance crosses wires)
810 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
811 */
812 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 813 CV *old_cv = GvCV(topgv);
814 SvREFCNT_dec(old_cv);
e1a479c5 815 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 816 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 817 GvCVGEN(topgv) = topgen_cmp;
818 }
819 return candidate;
820 }
821 }
9607fc9c 822
e1a479c5
BB		 823 /* Check UNIVERSAL without caching */
824 if(level == 0 || level == -1) {
aae43805 825 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
e1a479c5
BB		 826 if(candidate) {
827 cand_cv = GvCV(candidate);
828 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 829 CV *old_cv = GvCV(topgv);
830 SvREFCNT_dec(old_cv);
e1a479c5 831 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 832 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 833 GvCVGEN(topgv) = topgen_cmp;
834 }
835 return candidate;
836 }
837 }
838
839 if (topgv && GvREFCNT(topgv) == 1) {
840 /* cache the fact that the method is not defined */
841 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 842 }
843
79072805
LW		 844 return 0;
845}
846
954c1994 847/*
460e5730
FC		 848=for apidoc gv_fetchmeth_autoload
849
850This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
851parameter.
852
d21989ed 853=for apidoc gv_fetchmeth_sv_autoload
611c1e95 854
d21989ed
BF		 855Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
856of an SV instead of a string/length pair.
857
858=cut
859*/
860
861GV *
862Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
863{
864 char *namepv;
865 STRLEN namelen;
866 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
867 namepv = SvPV(namesv, namelen);
868 if (SvUTF8(namesv))
869 flags |= SVf_UTF8;
870 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
871}
872
873/*
874=for apidoc gv_fetchmeth_pv_autoload
875
876Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
877instead of a string/length pair.
878
879=cut
880*/
881
882GV *
883Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
884{
885 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
886 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
887}
888
889/*
890=for apidoc gv_fetchmeth_pvn_autoload
891
892Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ		 893Returns a glob for the subroutine.
894
895For an autoloaded subroutine without a GV, will create a GV even
896if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
897of the result may be zero.
898
d21989ed
BF		 899Currently, the only significant value for C<flags> is SVf_UTF8.
900
611c1e95
IZ		 901=cut
902*/
903
904GV *
d21989ed 905Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 906{
499321d3 907 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 908
d21989ed 909 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 910
611c1e95 911 if (!gv) {
611c1e95
IZ		 912 CV *cv;
913 GV **gvp;
914
915 if (!stash)
6136c704 916 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 917 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 918 return NULL;
d21989ed 919 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 920 return NULL;
611c1e95
IZ		 921 cv = GvCV(gv);
922 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 923 return NULL;
611c1e95
IZ		 924 /* Have an autoload */
925 if (level < 0) /* Cannot do without a stub */
d21989ed 926 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 927 gvp = (GV**)hv_fetch(stash, name,
928 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 929 if (!gvp)
6136c704 930 return NULL;
611c1e95
IZ		 931 return *gvp;
932 }
933 return gv;
934}
935
936/*
954c1994
GS		 937=for apidoc gv_fetchmethod_autoload
938
939Returns the glob which contains the subroutine to call to invoke the method
940on the C<stash>. In fact in the presence of autoloading this may be the
941glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 942already setup.
954c1994
GS		 943
944The third parameter of C<gv_fetchmethod_autoload> determines whether
945AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 946means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 947Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 948with a non-zero C<autoload> parameter.
954c1994 949
cec2d7b1
FC		 950These functions grant C<"SUPER"> token
951as a prefix of the method name. Note
954c1994
GS		 952that if you want to keep the returned glob for a long time, you need to
953check for it being "AUTOLOAD", since at the later time the call may load a
cec2d7b1
FC		 954different subroutine due to $AUTOLOAD changing its value. Use the glob
955created as a side effect to do this.
954c1994 956
cec2d7b1
FC		 957These functions have the same side-effects as C<gv_fetchmeth> with
958C<level==0>. The warning against passing the GV returned by
959C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS		 960
961=cut
962*/
963
dc848c6f 964GV *
864dbfa3 965Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 966{
547bb267
NC		 967 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
968
256d1bb2
NC		 969 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
970}
971
44130a26
BF		 972GV *
973Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
974{
975 char *namepv;
976 STRLEN namelen;
977 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
978 namepv = SvPV(namesv, namelen);
979 if (SvUTF8(namesv))
980 flags |= SVf_UTF8;
981 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
982}
983
984GV *
985Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
986{
987 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
988 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
989}
990
256d1bb2
NC		 991/* Don't merge this yet, as it's likely to get a len parameter, and possibly
992 even a U32 hash */
993GV *
44130a26 994Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 995{
eb578fdb 996 const char *nend;
c445ea15 997 const char *nsplit = NULL;
a0d0e21e 998 GV* gv;
0dae17bd 999 HV* ostash = stash;
c94593d0 1000 const char * const origname = name;
ad64d0ec 1001 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 1002 const U32 autoload = flags & GV_AUTOLOAD;
1003 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1004 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1005
44130a26 1006 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1007
eff494dd 1008 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1009 stash = NULL;
c9bf4021
NC		 1010 else {
1011 /* The only way stash can become NULL later on is if nsplit is set,
1012 which in turn means that there is no need for a SVt_PVHV case
1013 the error reporting code. */
1014 }
b267980d 1015
44130a26 1016 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 1017 if (*nend == '\'') {
a0d0e21e 1018 nsplit = nend;
c94593d0
NC		 1019 name = nend + 1;
1020 }
1021 else if (*nend == ':' && *(nend + 1) == ':') {
1022 nsplit = nend++;
1023 name = nend + 1;
1024 }
a0d0e21e
LW		 1025 }
1026 if (nsplit) {
7edbdc6b 1027 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 1028 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 1029 stash = CopSTASH(PL_curcop);
1030 flags |= GV_SUPER;
cea2e8a9 1031 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1032 origname, HvENAME_get(stash), name) );
4633a7c4 1033 }
aae43805
FC		 1034 else if ((nsplit - origname) >= 7 &&
1035 strnEQ(nsplit - 7, "::SUPER", 7)) {
1036 /* don't autovifify if ->NoSuchStash::SUPER::method */
1037 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
1038 if (stash) flags |= GV_SUPER;
1039 }
e189a56d 1040 else {
af09ea45 1041 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1042 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 1043 }
0dae17bd 1044 ostash = stash;
4633a7c4
LW		 1045 }
1046
14d1dfbd 1047 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1048 if (!gv) {
2f6e0fe7 1049 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1050 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1051 else if (autoload)
c8416c26
BF		 1052 gv = gv_autoload_pvn(
1053 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1054 );
256d1bb2
NC		 1055 if (!gv && do_croak) {
1056 /* Right now this is exclusively for the benefit of S_method_common
1057 in pp_hot.c */
1058 if (stash) {
15e6cdd9
DG		 1059 /* If we can't find an IO::File method, it might be a call on
1060 * a filehandle. If IO:File has not been loaded, try to
1061 * require it first instead of croaking */
1062 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1063 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1064 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1065 STR_WITH_LEN("IO/File.pm"), 0,
1066 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1067 ) {
31b05a0f 1068 require_pv("IO/File.pm");
14d1dfbd 1069 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG		 1070 if (gv)
1071 return gv;
1072 }
256d1bb2 1073 Perl_croak(aTHX_
b17a0679 1074 "Can't locate object method \"%"UTF8f
d0c0e7dd 1075 "\" via package \"%"HEKf"\"",
b17a0679 1076 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1077 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1078 }
1079 else {
ecad31f0 1080 SV* packnamesv;
256d1bb2 1081
256d1bb2 1082 if (nsplit) {
ecad31f0
BF		 1083 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1084 SVs_TEMP | is_utf8);
256d1bb2 1085 } else {
017c5e4e 1086 packnamesv = error_report;
256d1bb2
NC		 1087 }
1088
1089 Perl_croak(aTHX_
b17a0679
FC		 1090 "Can't locate object method \"%"UTF8f
1091 "\" via package \"%"SVf"\""
ecad31f0 1092 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1093 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1094 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1095 }
1096 }
463ee0b2 1097 }
dc848c6f 1098 else if (autoload) {
9d4ba2ae 1099 CV* const cv = GvCV(gv);
09280a33
CS		 1100 if (!CvROOT(cv) && !CvXSUB(cv)) {
1101 GV* stubgv;
1102 GV* autogv;
1103
0c028dca 1104 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS		 1105 stubgv = gv;
1106 else {
1107 stubgv = CvGV(cv);
1108 if (GvCV(stubgv) != cv) /* orphaned import */
1109 stubgv = gv;
1110 }
c8416c26
BF		 1111 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1112 GvNAME(stubgv), GvNAMELEN(stubgv),
1113 GV_AUTOLOAD_ISMETHOD
1114 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1115 if (autogv)
1116 gv = autogv;
1117 }
1118 }
44a8e56a 1119
1120 return gv;
1121}
1122
1123GV*
0eeb01b9 1124Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1125{
1126 char *namepv;
1127 STRLEN namelen;
0fe84f7c 1128 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1129 namepv = SvPV(namesv, namelen);
1130 if (SvUTF8(namesv))
1131 flags |= SVf_UTF8;
0eeb01b9 1132 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1133}
1134
1135GV*
0eeb01b9 1136Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1137{
0fe84f7c 1138 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1139 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1140}
1141
1142GV*
0eeb01b9 1143Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1144{
44a8e56a 1145 GV* gv;
1146 CV* cv;
1147 HV* varstash;
1148 GV* vargv;
1149 SV* varsv;
c8416c26
BF		 1150 SV *packname = NULL;
1151 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1152
0fe84f7c 1153 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1154
7edbdc6b 1155 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1156 return NULL;
0dae17bd
GS		 1157 if (stash) {
1158 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1159 STRLEN packname_len = 0;
1160 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1161 packname = newSVpvn_flags(packname_ptr, packname_len,
1162 SVs_TEMP | SvUTF8(stash));
5c284bb0 1163 stash = NULL;
0dae17bd 1164 }
c8416c26
BF		 1165 else
1166 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1167 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1168 }
257dc59d
FC		 1169 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1170 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1171 return NULL;
dc848c6f 1172 cv = GvCV(gv);
1173
adb5a9ae 1174 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1175 return NULL;
ed850460 1176
dc848c6f 1177 /*
1178 * Inheriting AUTOLOAD for non-methods works ... for now.
1179 */
0eeb01b9
FC		 1180 if (
1181 !(flags & GV_AUTOLOAD_ISMETHOD)
1182 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1183 )
d1d15184 1184 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC		 1185 "Use of inherited AUTOLOAD for non-method %"SVf
1186 "::%"UTF8f"() is deprecated",
ecad31f0 1187 SVfARG(packname),
b17a0679 1188 UTF8fARG(is_utf8, len, name));
44a8e56a 1189
aed2304a 1190 if (CvISXSUB(cv)) {
bb619f37
FC		 1191 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1192 * and split that value on the last '::', pass along the same data
1193 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1194 *
1195 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1196 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1197 * type. Since SvPVX has been documented as returning the sub name
1198 * for a long time, but not as returning the prototype, we have
1199 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1200 * elsewhere.
1201 *
1202 * We put the prototype in the same allocated buffer, but after
1203 * the sub name. The SvPOK flag indicates the presence of a proto-
1204 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1205 * If both flags are on, then SvLEN is used to indicate the end of
1206 * the prototype (artificially lower than what is actually allo-
1207 * cated), at the risk of having to reallocate a few bytes unneces-
1208 * sarily--but that should happen very rarely, if ever.
1209 *
1210 * We use SvUTF8 for both prototypes and sub names, so if one is
1211 * UTF8, the other must be upgraded.
adb5a9ae 1212 */
c68d9564 1213 CvSTASH_set(cv, stash);
8fa6a409 1214 if (SvPOK(cv)) { /* Ouch! */
e7881358 1215 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1216 STRLEN ulen;
1217 const char *proto = CvPROTO(cv);
1218 assert(proto);
1219 if (SvUTF8(cv))
1220 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1221 ulen = SvCUR(tmpsv);
1222 SvCUR(tmpsv)++; /* include null in string */
1223 sv_catpvn_flags(
1224 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1225 );
1226 SvTEMP_on(tmpsv); /* Allow theft */
1227 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1228 SvTEMP_off(tmpsv);
e7881358 1229 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1230 SvLEN(cv) = SvCUR(cv) + 1;
1231 SvCUR(cv) = ulen;
1232 }
1233 else {
1234 sv_setpvn((SV *)cv, name, len);
1235 SvPOK_off(cv);
1236 if (is_utf8)
c8416c26 1237 SvUTF8_on(cv);
8fa6a409
FC		 1238 else SvUTF8_off(cv);
1239 }
1240 CvAUTOLOAD_on(cv);
adb5a9ae 1241 }
adb5a9ae 1242
44a8e56a 1243 /*
1244 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1245 * The subroutine's original name may not be "AUTOLOAD", so we don't
1246 * use that, but for lack of anything better we will use the sub's
1247 * original package to look up $AUTOLOAD.
1248 */
18691622 1249 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1250 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1251 ENTER;
1252
c69033f2 1253 if (!isGV(vargv)) {
04ec7e59 1254 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1255#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1256 GvSV(vargv) = newSV(0);
c69033f2
NC		 1257#endif
1258 }
3d35f11b 1259 LEAVE;
e203899d 1260 varsv = GvSVn(vargv);
4bac9ae4
CS		 1261 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1262 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1263 sv_setsv(varsv, packname);
396482e1 1264 sv_catpvs(varsv, "::");
d40bf27b
NC		 1265 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1266 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1267 sv_catpvn_flags(
1268 varsv, name, len,
5bcd1ef4 1269 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1270 );
c8416c26
BF		 1271 if (is_utf8)
1272 SvUTF8_on(varsv);
a0d0e21e
LW		 1273 return gv;
1274}
1275
44a2ac75
YO		 1276
1277/* require_tie_mod() internal routine for requiring a module
486ec47a 1278 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO		 1279 *
1280 * The "gv" parameter should be the glob.
45cbc99a
RGS		 1281 * "varpv" holds the name of the var, used for error messages.
1282 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1283 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1284 * are working reasonably close to as expected.
1285 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1286 * For the protection of $! to work (it is set by this routine)
1287 * the sv slot must already be magicalized.
d2c93421 1288 */
44a2ac75
YO		 1289STATIC HV*
1290S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1291{
da51bb9b 1292 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1293
7918f24d
NC		 1294 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1295
0ea03996 1296 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1297 SV *module = newSVsv(namesv);
1298 char varname = *varpv; /* varpv might be clobbered by load_module,
1299 so save it. For the moment it's always
1300 a single char. */
b82b06b8 1301 const char type = varname == '[' ? '$' : '%';
61bac25c 1302#ifdef DEBUGGING
d2c93421 1303 dSP;
61bac25c 1304#endif
d2c93421 1305 ENTER;
600beb2e 1306 SAVEFREESV(namesv);
44a2ac75 1307 if ( flags & 1 )
45cbc99a
RGS		 1308 save_scalar(gv);
1309 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1310 assert(sp == PL_stack_sp);
da51bb9b 1311 stash = gv_stashsv(namesv, 0);
44a2ac75 1312 if (!stash)
b82b06b8
FC		 1313 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1314 type, varname, SVfARG(namesv));
45cbc99a 1315 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1316 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1317 type, varname, SVfARG(namesv), methpv);
600beb2e 1318 LEAVE;
d2c93421 1319 }
e7881358 1320 else SvREFCNT_dec_NN(namesv);
44a2ac75 1321 return stash;
d2c93421
RH		 1322}
1323
954c1994
GS		 1324/*
1325=for apidoc gv_stashpv
1326
da51bb9b 1327Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1328determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1329
1330=cut
1331*/
1332
a0d0e21e 1333HV*
864dbfa3 1334Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1335{
7918f24d 1336 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1337 return gv_stashpvn(name, strlen(name), create);
1338}
1339
bc96cb06
SH		 1340/*
1341=for apidoc gv_stashpvn
1342
da51bb9b
NC		 1343Returns a pointer to the stash for a specified package. The C<namelen>
1344parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1345to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1346created if it does not already exist. If the package does not exist and
1347C<flags> is 0 (or any other setting that does not create packages) then NULL
1348is returned.
1349
566a4718
YO		 1350Flags may be one of:
1351
1352 GV_ADD
1353 SVf_UTF8
1354 GV_NOADD_NOINIT
1355 GV_NOINIT
1356 GV_NOEXPAND
1357 GV_ADDMG
1358
1359The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06 1360
808724c8 1361Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1362recommended for performance reasons.
1363
bc96cb06
SH		 1364=cut
1365*/
1366
0eadbdad
YO		 1367/*
1368gv_stashpvn_internal
1369
1370Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1371as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1372
1373*/
1374
4e7ebec5 1375PERL_STATIC_INLINE HV*
0eadbdad 1376S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1377{
0cea0058 1378 char smallbuf[128];
46fc3d4c 1379 char *tmpbuf;
a0d0e21e
LW		 1380 HV *stash;
1381 GV *tmpgv;
add0ecde 1382 U32 tmplen = namelen + 2;
dc437b57 1383
0eadbdad 1384 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1385
add0ecde 1386 if (tmplen <= sizeof smallbuf)
46fc3d4c 1387 tmpbuf = smallbuf;
1388 else
add0ecde
VP		 1389 Newx(tmpbuf, tmplen, char);
1390 Copy(name, tmpbuf, namelen, char);
1391 tmpbuf[namelen] = ':';
1392 tmpbuf[namelen+1] = ':';
1393 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1394 if (tmpbuf != smallbuf)
1395 Safefree(tmpbuf);
a0d0e21e 1396 if (!tmpgv)
da51bb9b 1397 return NULL;
a0d0e21e 1398 stash = GvHV(tmpgv);
1f656fcf 1399 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1400 assert(stash);
1f656fcf 1401 if (!HvNAME_get(stash)) {
0be4d16f 1402 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1403
1404 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1405 /* If the containing stash has multiple effective
1406 names, see that this one gets them, too. */
1407 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1408 mro_package_moved(stash, NULL, tmpgv, 1);
1409 }
a0d0e21e 1410 return stash;
463ee0b2
LW		 1411}
1412
808724c8 1413/*
1414gv_stashsvpvn_cached
1415
1416Returns a pointer to the stash for a specified package, possibly
1417cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1418
1419Requires one of either namesv or namepv to be non-null.
1420
1421See C<gv_stashpvn> for details on "flags".
1422
1423Note the sv interface is strongly preferred for performance reasons.
1424
1425*/
1426
1427#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1428 assert(namesv || name)
1429
1430PERL_STATIC_INLINE HV*
1431S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1432{
1433 HV* stash;
808724c8 1434 HE* he;
1435
1436 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1437
1438 he = (HE *)hv_common(
1439 PL_stashcache, namesv, name, namelen,
4e7ebec5 1440 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1441 );
808724c8 1442
4e7ebec5 1443 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1444 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1445
808724c8 1446 if (namesv) {
1447 if (SvOK(namesv)) { /* prevent double uninit warning */
1448 STRLEN len;
1449 name = SvPV_const(namesv, len);
1450 namelen = len;
1451 flags |= SvUTF8(namesv);
1452 } else {
1453 name = ""; namelen = 0;
1454 }
1455 }
0eadbdad
YO		 1456 stash = gv_stashpvn_internal(name, namelen, flags);
1457
4e7ebec5 1458 if (stash && namelen) {
1459 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1460 (void)hv_store(PL_stashcache, name,
4e7ebec5 1461 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1462 }
808724c8 1463
4e7ebec5 1464 return stash;
1465}
1466
808724c8 1467HV*
1468Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1469{
1470 PERL_ARGS_ASSERT_GV_STASHPVN;
1471 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1472}
1473
954c1994
GS		 1474/*
1475=for apidoc gv_stashsv
1476
da51bb9b 1477Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994 1478
808724c8 1479Note this interface is strongly preferred over C<gv_stashpvn> for performance reasons.
1480
954c1994
GS		 1481=cut
1482*/
1483
a0d0e21e 1484HV*
da51bb9b 1485Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1486{
7918f24d 1487 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1488 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW		 1489}
1490
1491
463ee0b2 1492GV *
fe9845cc 1493Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1494 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1495 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1496}
1497
1498GV *
fe9845cc 1499Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1500 STRLEN len;
77cb3b01
FC		 1501 const char * const nambeg =
1502 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1503 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1504 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1505}
1506
90aeefb4 1507PERL_STATIC_INLINE void
290a1700 1508S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1509{
1510 AV* av;
1511
1512 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1513
1514 av = GvAVn(gv);
1515 GvMULTI_on(gv);
1516 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1517 NULL, 0);
ad7cce9f
FR		 1518}
1519
90aeefb4
BF		 1520/* This function grabs name and tries to split a stash and glob
1521 * from its contents. TODO better description, comments
1522 *
1523 * If the function returns TRUE and 'name == name_end', then
1524 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1525 */
1526PERL_STATIC_INLINE bool
1527S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1528 STRLEN *len, const char *nambeg, STRLEN full_len,
1529 const U32 is_utf8, const I32 add)
1530{
1531 const char *name_cursor;
1532 const char *const name_end = nambeg + full_len;
1533 const char *const name_em1 = name_end - 1;
1534
1535 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1536
1537 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1538 /* accidental stringify on a GV? */
1539 (*name)++;
1540 }
1541
1542 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1543 if (name_cursor < name_em1 &&
1544 ((*name_cursor == ':' && name_cursor[1] == ':')
1545 || *name_cursor == '\''))
1546 {
1547 if (!*stash)
1548 *stash = PL_defstash;
1549 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1550 return FALSE;
1551
1552 *len = name_cursor - *name;
1553 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1554 const char *key;
1555 GV**gvp;
1556 if (*name_cursor == ':') {
1557 key = *name;
1558 *len += 2;
1559 }
1560 else {
1561 char *tmpbuf;
1562 Newx(tmpbuf, *len+2, char);
1563 Copy(*name, tmpbuf, *len, char);
1564 tmpbuf[(*len)++] = ':';
1565 tmpbuf[(*len)++] = ':';
1566 key = tmpbuf;
1567 }
c161da64 1568 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF		 1569 *gv = gvp ? *gvp : NULL;
1570 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1571 if (SvTYPE(*gv) != SVt_PVGV)
1572 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1573 else
1574 GvMULTI_on(*gv);
1575 }
1576 if (key != *name)
1577 Safefree(key);
1578 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1579 return FALSE;
1580
1581 if (!(*stash = GvHV(*gv))) {
1582 *stash = GvHV(*gv) = newHV();
1583 if (!HvNAME_get(*stash)) {
1584 if (GvSTASH(*gv) == PL_defstash && *len == 6
1585 && strnEQ(*name, "CORE", 4))
1586 hv_name_set(*stash, "CORE", 4, 0);
1587 else
1588 hv_name_set(
1589 *stash, nambeg, name_cursor-nambeg, is_utf8
1590 );
1591 /* If the containing stash has multiple effective
1592 names, see that this one gets them, too. */
1593 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1594 mro_package_moved(*stash, NULL, *gv, 1);
1595 }
1596 }
1597 else if (!HvNAME_get(*stash))
1598 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1599 }
1600
1601 if (*name_cursor == ':')
1602 name_cursor++;
1603 *name = name_cursor+1;
1604 if (*name == name_end) {
1605 if (!*gv)
1606 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1607 return TRUE;
1608 }
1609 }
1610 }
1611 *len = name_cursor - *name;
1612 return TRUE;
1613}
1614
536d1a88 1615/* Checks if an unqualified name is in the main stash */
90aeefb4 1616PERL_STATIC_INLINE bool
536d1a88 1617S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1618{
536d1a88 1619 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1620
90aeefb4 1621 /* If it's an alphanumeric variable */
536d1a88 1622 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF		 1623 /* Some "normal" variables are always in main::,
1624 * like INC or STDOUT.
1625 */
1626 switch (len) {
1627 case 1:
1628 if (*name == '_')
536d1a88 1629 return TRUE;
90aeefb4
BF		 1630 break;
1631 case 3:
1632 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1633 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1634 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1635 return TRUE;
90aeefb4
BF		 1636 break;
1637 case 4:
1638 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1639 && name[3] == 'V')
536d1a88 1640 return TRUE;
90aeefb4
BF		 1641 break;
1642 case 5:
1643 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1644 && name[3] == 'I' && name[4] == 'N')
536d1a88 1645 return TRUE;
90aeefb4
BF		 1646 break;
1647 case 6:
1648 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1649 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1650 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1651 return TRUE;
90aeefb4
BF		 1652 break;
1653 case 7:
1654 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1655 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1656 && name[6] == 'T')
536d1a88 1657 return TRUE;
90aeefb4
BF		 1658 break;
1659 }
536d1a88
BF		 1660 }
1661 /* *{""}, or a special variable like $@ */
1662 else
1663 return TRUE;
1664
1665 return FALSE;
1666}
1667
1668
1669/* This function is called if parse_gv_stash_name() failed to
1670 * find a stash, or if GV_NOTQUAL or an empty name was passed
1671 * to gv_fetchpvn_flags.
1672 *
1673 * It returns FALSE if the default stash can't be found nor created,
1674 * which might happen during global destruction.
1675 */
1676PERL_STATIC_INLINE bool
1677S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1678 const U32 is_utf8, const I32 add,
1679 const svtype sv_type)
1680{
1681 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1682
1683 /* No stash in name, so see how we can default */
90aeefb4 1684
536d1a88
BF		 1685 if ( gv_is_in_main(name, len, is_utf8) ) {
1686 *stash = PL_defstash;
1687 }
1688 else {
1689 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1690 *stash = PL_curstash;
1691 if (add && (PL_hints & HINT_STRICT_VARS) &&
1692 sv_type != SVt_PVCV &&
1693 sv_type != SVt_PVGV &&
1694 sv_type != SVt_PVFM &&
1695 sv_type != SVt_PVIO &&
1696 !(len == 1 && sv_type == SVt_PV &&
1697 (*name == 'a' || *name == 'b')) )
1698 {
c161da64 1699 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1700 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1701 SvTYPE(*gvp) != SVt_PVGV)
1702 {
1703 *stash = NULL;
1704 }
1705 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1706 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1707 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1708 {
1709 /* diag_listed_as: Variable "%s" is not imported%s */
1710 Perl_ck_warner_d(
1711 aTHX_ packWARN(WARN_MISC),
1712 "Variable \"%c%"UTF8f"\" is not imported",
1713 sv_type == SVt_PVAV ? '@' :
1714 sv_type == SVt_PVHV ? '%' : '$',
1715 UTF8fARG(is_utf8, len, name));
1716 if (GvCVu(*gvp))
1717 Perl_ck_warner_d(
1718 aTHX_ packWARN(WARN_MISC),
1719 "\t(Did you mean &%"UTF8f" instead?)\n",
1720 UTF8fARG(is_utf8, len, name)
1721 );
1722 *stash = NULL;
1723 }
1724 }
1725 }
1726 else {
1727 /* Use the current op's stash */
1728 *stash = CopSTASH(PL_curcop);
1729 }
1730 }
90aeefb4
BF		 1731
1732 if (!*stash) {
1733 if (add && !PL_in_clean_all) {
1734 SV * const err = Perl_mess(aTHX_
1735 "Global symbol \"%s%"UTF8f
1736 "\" requires explicit package name",
1737 (sv_type == SVt_PV ? "$"
1738 : sv_type == SVt_PVAV ? "@"
1739 : sv_type == SVt_PVHV ? "%"
1740 : ""), UTF8fARG(is_utf8, len, name));
1741 GV *gv;
1742 if (is_utf8)
1743 SvUTF8_on(err);
1744 qerror(err);
cd164bf8
BF		 1745 /* To maintain the output of errors after the strict exception
1746 * above, and to keep compat with older releases, rather than
1747 * placing the variables in the pad, we place
1748 * them in the <none>:: stash.
1749 */
90aeefb4
BF		 1750 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1751 if (!gv) {
1752 /* symbol table under destruction */
1753 return FALSE;
1754 }
1755 *stash = GvHV(gv);
1756 }
1757 else
1758 return FALSE;
1759 }
1760
1761 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1762 return FALSE;
1763
1764 return TRUE;
1765}
1766
930867a8
BF		 1767/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1768 * a new GV.
1769 * Note that it does not insert the GV into the stash prior to
1770 * magicalization, which some variables require need in order
1771 * to work (like $[, %+, %-, %!), so callers must take care of
1772 * that beforehand.
1773 *
1774 * The return value has a specific meaning for gv_fetchpvn_flags:
1775 * If it returns true, and the gv is empty, it indicates that its
1776 * refcount should be decreased.
1777 */
1778PERL_STATIC_INLINE bool
1779S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1780 bool addmg, const svtype sv_type)
79072805 1781{
960b831f 1782 SSize_t paren;
79072805 1783
930867a8 1784 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1785
44428a46 1786 if (stash != PL_defstash) { /* not the main stash */
ea238638 1787 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1788 and VERSION. All the others apply only to the main stash or to
1789 CORE (which is checked right after this). */
ea238638 1790 if (len) {
b464bac0 1791 const char * const name2 = name + 1;
cc4c2da6 1792 switch (*name) {
cc4c2da6
NC		 1793 case 'E':
1794 if (strnEQ(name2, "XPORT", 5))
1795 GvMULTI_on(gv);
1796 break;
1797 case 'I':
44428a46 1798 if (strEQ(name2, "SA"))
290a1700 1799 gv_magicalize_isa(gv);
cc4c2da6 1800 break;
44428a46
FC		 1801 case 'V':
1802 if (strEQ(name2, "ERSION"))
1803 GvMULTI_on(gv);
1804 break;
ea238638
FC		 1805 case 'a':
1806 case 'b':
1807 if (len == 1 && sv_type == SVt_PV)
1808 GvMULTI_on(gv);
924ba076 1809 /* FALLTHROUGH */
4aaa4757
FC		 1810 default:
1811 goto try_core;
1812 }
930867a8 1813 return addmg;
4aaa4757
FC		 1814 }
1815 try_core:
1816 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1817 /* Avoid null warning: */
1818 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1819 if (strnEQ(stashname, "CORE", 4))
1820 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1821 }
1822 }
1823 else if (len > 1) {
1824#ifndef EBCDIC
1825 if (*name > 'V' ) {
1826 NOOP;
1827 /* Nothing else to do.
1828 The compiler will probably turn the switch statement into a
1829 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1830 the common case of lower case variable names. (On EBCDIC
1831 platforms, we can't just do:
1832 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1833 because cases like '\027' in the switch statement below are
1834 C1 (non-ASCII) controls on those platforms, so the remapping
1835 would make them larger than 'V')
1836 */
44428a46
FC		 1837 } else
1838#endif
1839 {
1840 const char * const name2 = name + 1;
1841 switch (*name) {
1842 case 'A':
1843 if (strEQ(name2, "RGV")) {
1844 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1845 }
1846 else if (strEQ(name2, "RGVOUT")) {
1847 GvMULTI_on(gv);
1848 }
1849 break;
1850 case 'E':
1851 if (strnEQ(name2, "XPORT", 5))
1852 GvMULTI_on(gv);
1853 break;
1854 case 'I':
1855 if (strEQ(name2, "SA")) {
290a1700 1856 gv_magicalize_isa(gv);
44428a46
FC		 1857 }
1858 break;
cc4c2da6
NC		 1859 case 'S':
1860 if (strEQ(name2, "IG")) {
1861 HV *hv;
1862 I32 i;
d525a7b2
NC		 1863 if (!PL_psig_name) {
1864 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1865 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1866 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1867 } else {
1868 /* I think that the only way to get here is to re-use an
1869 embedded perl interpreter, where the previous
1870 use didn't clean up fully because
1871 PL_perl_destruct_level was 0. I'm not sure that we
1872 "support" that, in that I suspect in that scenario
1873 there are sufficient other garbage values left in the
1874 interpreter structure that something else will crash
1875 before we get here. I suspect that this is one of
1876 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1877 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1878 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1879 }
1880 GvMULTI_on(gv);
1881 hv = GvHVn(gv);
a0714e2c 1882 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1883 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1884 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1885 if (init)
1886 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1887 }
1888 }
1889 break;
1890 case 'V':
1891 if (strEQ(name2, "ERSION"))
1892 GvMULTI_on(gv);
1893 break;
e5218da5
GA		 1894 case '\003': /* $^CHILD_ERROR_NATIVE */
1895 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1896 goto magicalize;
1897 break;
cc4c2da6
NC		 1898 case '\005': /* $^ENCODING */
1899 if (strEQ(name2, "NCODING"))
1900 goto magicalize;
1901 break;
9ebf26ad
FR		 1902 case '\007': /* $^GLOBAL_PHASE */
1903 if (strEQ(name2, "LOBAL_PHASE"))
1904 goto ro_magicalize;
1905 break;
8561ea1d
FC		 1906 case '\014': /* $^LAST_FH */
1907 if (strEQ(name2, "AST_FH"))
1908 goto ro_magicalize;
1909 break;
cde0cee5 1910 case '\015': /* $^MATCH */
960b831f
NC		 1911 if (strEQ(name2, "ATCH")) {
1912 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1913 goto storeparen;
1914 }
66230c86 1915 break;
cc4c2da6
NC		 1916 case '\017': /* $^OPEN */
1917 if (strEQ(name2, "PEN"))
1918 goto magicalize;
1919 break;
cde0cee5 1920 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC		 1921 if (strEQ(name2, "REMATCH")) {
1922 paren = RX_BUFF_IDX_CARET_PREMATCH;
1923 goto storeparen;
1924 }
1925 if (strEQ(name2, "OSTMATCH")) {
1926 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1927 goto storeparen;
1928 }
9ebf26ad 1929 break;
cc4c2da6
NC		 1930 case '\024': /* ${^TAINT} */
1931 if (strEQ(name2, "AINT"))
1932 goto ro_magicalize;
1933 break;
7cebcbc0 1934 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1935 if (strEQ(name2, "NICODE"))
cc4c2da6 1936 goto ro_magicalize;
a0288114 1937 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1938 goto ro_magicalize;
e07ea26a
NC		 1939 if (strEQ(name2, "TF8CACHE"))
1940 goto magicalize;
cc4c2da6
NC		 1941 break;
1942 case '\027': /* $^WARNING_BITS */
1943 if (strEQ(name2, "ARNING_BITS"))
1944 goto magicalize;
1945 break;
1946 case '1':
1947 case '2':
1948 case '3':
1949 case '4':
1950 case '5':
1951 case '6':
1952 case '7':
1953 case '8':
1954 case '9':
85e6fe83 1955 {
2fdbfb4d
AB		 1956 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1957 this test */
1958 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC		 1959 const char *end = name + len;
1960 while (--end > name) {
930867a8
BF		 1961 if (!isDIGIT(*end))
1962 return addmg;
cc4c2da6 1963 }
99944878 1964 paren = grok_atou(name, NULL);
960b831f 1965 goto storeparen;
1d7c1841 1966 }
dc437b57 1967 }
93a17b20 1968 }
392db708
NC		 1969 } else {
1970 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1971 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1972 switch (*name) {
6361f656 1973 case '&': /* $& */
960b831f
NC		 1974 paren = RX_BUFF_IDX_FULLMATCH;
1975 goto sawampersand;
6361f656 1976 case '`': /* $` */
960b831f
NC		 1977 paren = RX_BUFF_IDX_PREMATCH;
1978 goto sawampersand;
6361f656 1979 case '\'': /* $' */
960b831f
NC		 1980 paren = RX_BUFF_IDX_POSTMATCH;
1981 sawampersand:
1a904fc8 1982#ifdef PERL_SAWAMPERSAND
a289ef89 1983 if (!(
cc4c2da6
NC		 1984 sv_type == SVt_PVAV ||
1985 sv_type == SVt_PVHV ||
1986 sv_type == SVt_PVCV ||
1987 sv_type == SVt_PVFM ||
1988 sv_type == SVt_PVIO
d3b97530
DM		 1989 )) { PL_sawampersand |=
1990 (*name == '`')
1991 ? SAWAMPERSAND_LEFT
1992 : (*name == '&')
1993 ? SAWAMPERSAND_MIDDLE
1994 : SAWAMPERSAND_RIGHT;
1995 }
1a904fc8 1996#endif
960b831f 1997 goto storeparen;
e91d8259
NC		 1998 case '1': /* $1 */
1999 case '2': /* $2 */
2000 case '3': /* $3 */
2001 case '4': /* $4 */
2002 case '5': /* $5 */
2003 case '6': /* $6 */
2004 case '7': /* $7 */
2005 case '8': /* $8 */
2006 case '9': /* $9 */
960b831f
NC		 2007 paren = *name - '0';
2008
2009 storeparen:
e91d8259
NC		 2010 /* Flag the capture variables with a NULL mg_ptr
2011 Use mg_len for the array index to lookup. */
960b831f 2012 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2013 break;
cc4c2da6 2014
6361f656 2015 case ':': /* $: */
c69033f2 2016 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 2017 goto magicalize;
2018
6361f656 2019 case '?': /* $? */
ff0cee69 2020#ifdef COMPLEX_STATUS
c69033f2 2021 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2022#endif
cc4c2da6 2023 goto magicalize;
ff0cee69 2024
6361f656 2025 case '!': /* $! */
67261566 2026 GvMULTI_on(gv);
44a2ac75 2027 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2028
ad64d0ec 2029 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2030
44a2ac75 2031 /* magicalization must be done before require_tie_mod is called */
67261566 2032 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 2033 {
44a2ac75 2034 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 2035 addmg = FALSE;
ffdb8bcd 2036 }
d2c93421 2037
6cef1e77 2038 break;
6361f656
AB		 2039 case '-': /* $- */
2040 case '+': /* $+ */
44a2ac75
YO		 2041 GvMULTI_on(gv); /* no used once warnings here */
2042 {
44a2ac75 2043 AV* const av = GvAVn(gv);
ad64d0ec 2044 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2045
ad64d0ec
NC		 2046 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2047 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2048 if (avc)
44a2ac75 2049 SvREADONLY_on(GvSVn(gv));
44a2ac75 2050 SvREADONLY_on(av);
67261566
YO		 2051
2052 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 2053 {
192b9cd1 2054 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 2055 addmg = FALSE;
213084e4 2056 }
67261566 2057
80305961 2058 break;
cc4c2da6 2059 }
6361f656
AB		 2060 case '*': /* $* */
2061 case '#': /* $# */
9b387841 2062 if (sv_type == SVt_PV)
4f650b80 2063 /* diag_listed_as: $* is no longer supported */
9b387841 2064 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2065 "$%c is no longer supported", *name);
8ae1fe26 2066 break;
b3ca2e83
NC		 2067 case '\010': /* $^H */
2068 {
2069 HV *const hv = GvHVn(gv);
2070 hv_magic(hv, NULL, PERL_MAGIC_hints);
2071 }
2072 goto magicalize;
b82b06b8 2073 case '[': /* $[ */
7d69d4a6 2074 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2075 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 2076 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 2077 addmg = FALSE;
b82b06b8 2078 }
7d69d4a6 2079 else goto magicalize;
b82b06b8 2080 break;
cc4c2da6 2081 case '\023': /* $^S */
2fdbfb4d
AB		 2082 ro_magicalize:
2083 SvREADONLY_on(GvSVn(gv));
924ba076 2084 /* FALLTHROUGH */
6361f656 2085 case '0': /* $0 */
6361f656
AB		 2086 case '^': /* $^ */
2087 case '~': /* $~ */
2088 case '=': /* $= */
2089 case '%': /* $% */
2090 case '.': /* $. */
2091 case '(': /* $( */
2092 case ')': /* $) */
2093 case '<': /* $< */
2094 case '>': /* $> */
2095 case '\\': /* $\ */
2096 case '/': /* $/ */
4505a31f 2097 case '|': /* $| */
9cdac2a2 2098 case '$': /* $$ */
cc4c2da6
NC		 2099 case '\001': /* $^A */
2100 case '\003': /* $^C */
2101 case '\004': /* $^D */
2102 case '\005': /* $^E */
2103 case '\006': /* $^F */
cc4c2da6
NC		 2104 case '\011': /* $^I, NOT \t in EBCDIC */
2105 case '\016': /* $^N */
2106 case '\017': /* $^O */
2107 case '\020': /* $^P */
2108 case '\024': /* $^T */
2109 case '\027': /* $^W */
2110 magicalize:
ad64d0ec 2111 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2112 break;
e521374c 2113
cc4c2da6 2114 case '\014': /* $^L */
76f68e9b 2115 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2116 break;
6361f656 2117 case ';': /* $; */
76f68e9b 2118 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2119 break;
6361f656 2120 case ']': /* $] */
cc4c2da6 2121 {
3638bf15 2122 SV * const sv = GvSV(gv);
d7aa5382 2123 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2124 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2125 GvSV(gv) = vnumify(PL_patchlevel);
2126 SvREADONLY_on(GvSV(gv));
2127 SvREFCNT_dec(sv);
93a17b20
LW		 2128 }
2129 break;
cc4c2da6
NC		 2130 case '\026': /* $^V */
2131 {
3638bf15 2132 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2133 GvSV(gv) = new_version(PL_patchlevel);
2134 SvREADONLY_on(GvSV(gv));
2135 SvREFCNT_dec(sv);
16070b82
GS		 2136 }
2137 break;
ea238638
FC		 2138 case 'a':
2139 case 'b':
dc3e91f6 2140 if (sv_type == SVt_PV)
ea238638 2141 GvMULTI_on(gv);
cc4c2da6 2142 }
79072805 2143 }
930867a8
BF		 2144
2145 return addmg;
71c35c05
BF		 2146}
2147
070dc475
BF		 2148/* This function is called when the stash already holds the GV of the magic
2149 * variable we're looking for, but we need to check that it has the correct
2150 * kind of magic. For example, if someone first uses $! and then %!, the
2151 * latter would end up here, and we add the Errno tie to the HASH slot of
2152 * the *! glob.
2153 */
2154PERL_STATIC_INLINE void
2155S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2156{
2157 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2158
2159 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2160 if (*name == '!')
2161 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2162 else if (*name == '-' || *name == '+')
2163 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2164 } else if (sv_type == SVt_PV) {
2165 if (*name == '*' || *name == '#') {
2166 /* diag_listed_as: $* is no longer supported */
2167 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2168 WARN_SYNTAX),
2169 "$%c is no longer supported", *name);
2170 }
2171 }
2172 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2173 switch (*name) {
2174 case '[':
2175 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2176 break;
2177#ifdef PERL_SAWAMPERSAND
2178 case '`':
2179 PL_sawampersand |= SAWAMPERSAND_LEFT;
2180 (void)GvSVn(gv);
2181 break;
2182 case '&':
2183 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2184 (void)GvSVn(gv);
2185 break;
2186 case '\'':
2187 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2188 (void)GvSVn(gv);
2189 break;
2190#endif
2191 }
2192 }
2193}
2194
71c35c05
BF		 2195GV *
2196Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2197 const svtype sv_type)
2198{
71c35c05
BF		 2199 const char *name = nambeg;
2200 GV *gv = NULL;
2201 GV**gvp;
2202 STRLEN len;
2203 HV *stash = NULL;
2204 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2205 const I32 no_expand = flags & GV_NOEXPAND;
2206 const I32 add = flags & ~GV_NOADD_MASK;
2207 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2208 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2209 const char *const name_end = nambeg + full_len;
2210 U32 faking_it;
2211
2212 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2213
2214 /* If we have GV_NOTQUAL, the caller promised that
2215 * there is no stash, so we can skip the check.
2216 * Similarly if full_len is 0, since then we're
2217 * dealing with something like *{""} or ""->foo()
2218 */
2219 if ((flags & GV_NOTQUAL) || !full_len) {
2220 len = full_len;
2221 }
2222 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2223 if (name == name_end) return gv;
2224 }
2225 else {
2226 return NULL;
2227 }
2228
2229 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2230 return NULL;
2231 }
2232
2233 /* By this point we should have a stash and a name */
c161da64 2234 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2235 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2236 if (addmg) gv = (GV *)newSV(0);
2237 else return NULL;
2238 }
2239 else gv = *gvp, addmg = 0;
2240 /* From this point on, addmg means gv has not been inserted in the
2241 symtab yet. */
2242
2243 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2244 /* The GV already exists, so return it, but check if we need to do
2245 * anything else with it before that.
2246 */
71c35c05 2247 if (add) {
c002ae9a
BF		 2248 /* This is the heuristic that handles if a variable triggers the
2249 * 'used only once' warning. If there's already a GV in the stash
2250 * with this name, then we assume that the variable has been used
2251 * before and turn its MULTI flag on.
2252 * It's a heuristic because it can easily be "tricked", like with
2253 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2254 * not warning about $main::foo being used just once
2255 */
71c35c05
BF		 2256 GvMULTI_on(gv);
2257 gv_init_svtype(gv, sv_type);
2258 /* You reach this path once the typeglob has already been created,
2259 either by the same or a different sigil. If this path didn't
2260 exist, then (say) referencing $! first, and %! second would
2261 mean that %! was not handled correctly. */
2262 if (len == 1 && stash == PL_defstash) {
070dc475 2263 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2264 }
2265 else if (len == 3 && sv_type == SVt_PVAV
2266 && strnEQ(name, "ISA", 3)
2267 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2268 gv_magicalize_isa(gv);
2269 }
2270 return gv;
2271 } else if (no_init) {
2272 assert(!addmg);
2273 return gv;
c002ae9a
BF		 2274 }
2275 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2276 * don't expand it to a glob. This is an optimization so that things
2277 * copying constants over, like Exporter, don't have to be rewritten
2278 * to take into account that you can store more than just globs in
2279 * stashes.
2280 */
2281 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2282 assert(!addmg);
2283 return gv;
2284 }
2285
2286 /* Adding a new symbol.
2287 Unless of course there was already something non-GV here, in which case
2288 we want to behave as if there was always a GV here, containing some sort
2289 of subroutine.
2290 Otherwise we run the risk of creating things like GvIO, which can cause
2291 subtle bugs. eg the one that tripped up SQL::Translator */
2292
2293 faking_it = SvOK(gv);
2294
2295 if (add & GV_ADDWARN)
2296 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2297 "Had to create %"UTF8f" unexpectedly",
2298 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2299 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2300
9e5de6ae 2301 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2302 GvMULTI_on(gv) ;
2303
930867a8
BF		 2304 /* First, store the gv in the symtab if we're adding magic,
2305 * but only for non-empty GVs
2306 */
2307#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2308 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2309
2310 if ( addmg && !GvEMPTY(gv) ) {
2311 (void)hv_store(stash,name,len,(SV *)gv,0);
2312 }
2313
71c35c05 2314 /* set up magic where warranted */
930867a8
BF		 2315 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2316 /* See 23496c6 */
2317 if (GvEMPTY(gv)) {
2318 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2319 /* The GV was and still is "empty", except that now
2320 * it has the magic flags turned on, so we want it
2321 * stored in the symtab.
2322 */
2323 (void)hv_store(stash,name,len,(SV *)gv,0);
2324 }
2325 else {
2326 /* Most likely the temporary GV created above */
2327 SvREFCNT_dec_NN(gv);
2328 gv = NULL;
2329 }
2330 }
2331 }
71c35c05 2332
e6066781 2333 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2334 return gv;
79072805
LW		 2335}
2336
2337void
35a4481c 2338Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2339{
ed60a868 2340 const char *name;
35a4481c 2341 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2342
2343 PERL_ARGS_ASSERT_GV_FULLNAME4;
2344
666ea192 2345 sv_setpv(sv, prefix ? prefix : "");
a0288114 2346
52a6327b 2347 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2348 const STRLEN len = HvNAMELEN(hv);
2349 if (keepmain || strnNE(name, "main", len)) {
2350 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2351 sv_catpvs(sv,"::");
ed60a868 2352 }
43693395 2353 }
ed60a868 2354 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2355 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2356}
2357
2358void
35a4481c 2359Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2360{
099be4f1 2361 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2362
2363 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2364
46c461b5 2365 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2366}
2367
39a65960
DM		 2368
2369/* recursively scan a stash and any nested stashes looking for entries
2370 * that need the "only used once" warning raised
2371 */
2372
79072805 2373void
51da40ed 2374Perl_gv_check(pTHX_ HV *stash)
79072805 2375{
eb578fdb 2376 I32 i;
463ee0b2 2377
7918f24d
NC		 2378 PERL_ARGS_ASSERT_GV_CHECK;
2379
8990e307
LW		 2380 if (!HvARRAY(stash))
2381 return;
90754377
DM		 2382
2383 assert(SvOOK(stash));
90754377 2384
a0d0e21e 2385 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2386 const HE *entry;
90754377 2387 /* mark stash is being scanned, to avoid recursing */
339441ef 2388 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2389 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2390 GV *gv;
b7787f18 2391 HV *hv;
dc437b57 2392 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2393 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2394 {
90754377
DM		 2395 if (hv != PL_defstash && hv != stash
2396 && !(SvOOK(hv)
2397 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2398 )
a0d0e21e
LW		 2399 gv_check(hv); /* nested package */
2400 }
ecad31f0
BF		 2401 else if ( *HeKEY(entry) != '_'
2402 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2403 const char *file;
159b6efe 2404 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2405 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2406 continue;
1d7c1841 2407 file = GvFILE(gv);
1d7c1841 2408 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2409#ifdef USE_ITHREADS
2410 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2411#else
2412 CopFILEGV(PL_curcop)
2413 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2414#endif
9014280d 2415 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2416 "Name \"%"HEKf"::%"HEKf
2417 "\" used only once: possible typo",
2418 HEKfARG(HvNAME_HEK(stash)),
2419 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2420 }
79072805 2421 }
339441ef 2422 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2423 }
2424}
2425
2426GV *
9cc50d5b 2427Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2428{
9cc50d5b 2429 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2430 assert(!(flags & ~SVf_UTF8));
7918f24d 2431
b17a0679
FC		 2432 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2433 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2434 (long)PL_gensym++),
2435 GV_ADD, SVt_PVGV);
79072805
LW		 2436}
2437
2438/* hopefully this is only called on local symbol table entries */
2439
2440GP*
864dbfa3 2441Perl_gp_ref(pTHX_ GP *gp)
79072805 2442{
1d7c1841 2443 if (!gp)
d4c19fe8 2444 return NULL;
79072805 2445 gp->gp_refcnt++;
44a8e56a 2446 if (gp->gp_cv) {
2447 if (gp->gp_cvgen) {
e1a479c5
BB		 2448 /* If the GP they asked for a reference to contains
2449 a method cache entry, clear it first, so that we
2450 don't infect them with our cached entry */
e7881358 2451 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2452 gp->gp_cv = NULL;
44a8e56a 2453 gp->gp_cvgen = 0;
2454 }
44a8e56a 2455 }
79072805 2456 return gp;
79072805
LW		 2457}
2458
2459void
864dbfa3 2460Perl_gp_free(pTHX_ GV *gv)
79072805 2461{
79072805 2462 GP* gp;
b0d55c99 2463 int attempts = 100;
79072805 2464
f7877b28 2465 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2466 return;
f248d071 2467 if (gp->gp_refcnt == 0) {
9b387841
NC		 2468 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2469 "Attempt to free unreferenced glob pointers"
2470 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2471 return;
2472 }
4571f4a7 2473 if (gp->gp_refcnt > 1) {
bc81b34d 2474 borrowed:
748a9306
LW		 2475 if (gp->gp_egv == gv)
2476 gp->gp_egv = 0;
4571f4a7 2477 gp->gp_refcnt--;
c43ae56f 2478 GvGP_set(gv, NULL);
79072805 2479 return;
748a9306 2480 }
79072805 2481
b0d55c99
FC		 2482 while (1) {
2483 /* Copy and null out all the glob slots, so destructors do not see
2484 freed SVs. */
2485 HEK * const file_hek = gp->gp_file_hek;
2486 SV * const sv = gp->gp_sv;
2487 AV * const av = gp->gp_av;
2488 HV * const hv = gp->gp_hv;
2489 IO * const io = gp->gp_io;
2490 CV * const cv = gp->gp_cv;
2491 CV * const form = gp->gp_form;
2492
2493 gp->gp_file_hek = NULL;
2494 gp->gp_sv = NULL;
2495 gp->gp_av = NULL;
2496 gp->gp_hv = NULL;
2497 gp->gp_io = NULL;
2498 gp->gp_cv = NULL;
2499 gp->gp_form = NULL;
2500
2501 if (file_hek)
2502 unshare_hek(file_hek);
2503
2504 SvREFCNT_dec(sv);
2505 SvREFCNT_dec(av);
2506 /* FIXME - another reference loop GV -> symtab -> GV ?
2507 Somehow gp->gp_hv can end up pointing at freed garbage. */
2508 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2509 const HEK *hvname_hek = HvNAME_HEK(hv);
10bafe90 2510 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", HEKfARG(hvname_hek)));
c2242065 2511 if (PL_stashcache && hvname_hek)
0ca9877d 2512 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
b0d55c99
FC		 2513 SvREFCNT_dec(hv);
2514 }
2515 SvREFCNT_dec(io);
2516 SvREFCNT_dec(cv);
2517 SvREFCNT_dec(form);
2518
bc81b34d
FC		 2519 /* Possibly reallocated by a destructor */
2520 gp = GvGP(gv);
2521
b0d55c99
FC		 2522 if (!gp->gp_file_hek
2523 && !gp->gp_sv
2524 && !gp->gp_av
2525 && !gp->gp_hv
2526 && !gp->gp_io
2527 && !gp->gp_cv
2528 && !gp->gp_form) break;
2529
2530 if (--attempts == 0) {
2531 Perl_die(aTHX_
2532 "panic: gp_free failed to free glob pointer - "
2533 "something is repeatedly re-creating entries"
2534 );
2535 }
13207a71 2536 }
748a9306 2537
bc81b34d
FC		 2538 /* Possibly incremented by a destructor doing glob assignment */
2539 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2540 Safefree(gp);
c43ae56f 2541 GvGP_set(gv, NULL);
79072805
LW		 2542}
2543
d460ef45
NIS		 2544int
2545Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2546{
53c1dcc0
AL		 2547 AMT * const amtp = (AMT*)mg->mg_ptr;
2548 PERL_UNUSED_ARG(sv);
dd374669 2549
7918f24d
NC		 2550 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2551
d460ef45
NIS		 2552 if (amtp && AMT_AMAGIC(amtp)) {
2553 int i;
2554 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2555 CV * const cv = amtp->table[i];
b37c2d43 2556 if (cv) {
e7881358 2557 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2558 amtp->table[i] = NULL;
d460ef45
NIS		 2559 }
2560 }
2561 }
2562 return 0;
2563}
2564
a0d0e21e 2565/* Updates and caches the CV's */
c3a9a790
RGS		 2566/* Returns:
2567 * 1 on success and there is some overload
2568 * 0 if there is no overload
2569 * -1 if some error occurred and it couldn't croak
2570 */
a0d0e21e 2571
c3a9a790 2572int
242f8760 2573Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2574{
ad64d0ec 2575 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2576 AMT amt;
9b439311 2577 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2578 U32 newgen;
a0d0e21e 2579
7918f24d
NC		 2580 PERL_ARGS_ASSERT_GV_AMUPDATE;
2581
9b439311 2582 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2583 if (mg) {
2584 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2585 if (amtp->was_ok_sub == newgen) {
8c34e50d 2586 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2587 }
ad64d0ec 2588 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2589 }
a0d0e21e 2590
bfcb3514 2591 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2592
d460ef45 2593 Zero(&amt,1,AMT);
e1a479c5 2594 amt.was_ok_sub = newgen;
a6006777 2595 amt.fallback = AMGfallNO;
2596 amt.flags = 0;
2597
a6006777 2598 {
8c34e50d
FC		 2599 int filled = 0;
2600 int i;
3d147ac2
DM		 2601 bool deref_seen = 0;
2602
a6006777 2603
3866ea3b 2604 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2605
89ffc314 2606 /* Try to find via inheritance. */
e6919483 2607 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2608 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2609 CV* cv;
89ffc314
IZ		 2610
2611 if (!gv)
3866ea3b
FC		 2612 {
2613 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2614 goto no_table;
3866ea3b
FC		 2615 }
2616#ifdef PERL_DONT_CREATE_GVSV
2617 else if (!sv) {
6f207bd3 2618 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2619 }
2620#endif
79c9643d
JL		 2621 else if (SvTRUE(sv))
2622 /* don't need to set overloading here because fallback => 1
2623 * is the default setting for classes without overloading */
89ffc314 2624 amt.fallback=AMGfallYES;
79c9643d
JL		 2625 else if (SvOK(sv)) {
2626 amt.fallback=AMGfallNEVER;
386a5489 2627 filled = 1;
386a5489 2628 }
79c9643d 2629 else {
386a5489 2630 filled = 1;
386a5489 2631 }
a6006777 2632
3d147ac2 2633 assert(SvOOK(stash));
3d147ac2 2634 /* initially assume the worst */
339441ef 2635 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2636
8c34e50d 2637 for (i = 1; i < NofAMmeth; i++) {
6136c704 2638 const char * const cooky = PL_AMG_names[i];
32251b26 2639 /* Human-readable form, for debugging: */
8c34e50d 2640 const char * const cp = AMG_id2name(i);
d279ab82 2641 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2642
a0288114 2643 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2644 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2645 /* don't fill the cache while looking up!
2646 Creation of inheritance stubs in intermediate packages may
2647 conflict with the logic of runtime method substitution.
2648 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2649 then we could have created stubs for "(+0" in A and C too.
2650 But if B overloads "bool", we may want to use it for
2651 numifying instead of C's "+0". */
8c34e50d 2652 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2653 cv = 0;
c3ad4e54
FC		 2654 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2655 const HEK * const gvhek =
2656 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2657 const HEK * const stashek =
2658 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2659 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2660 && stashek && HEK_LEN(stashek) == 8
2661 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ		 2662 /* This is a hack to support autoloading..., while
2663 knowing *which* methods were declared as overloaded. */
44a8e56a 2664 /* GvSV contains the name of the method. */
6136c704 2665 GV *ngv = NULL;
c69033f2 2666 SV *gvsv = GvSV(gv);
a0288114
AL		 2667
2668 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2669 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2670 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2671 if (!gvsv || !SvPOK(gvsv)
7f415459 2672 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2673 {
a0288114 2674 /* Can be an import stub (created by "can"). */
242f8760 2675 if (destructing) {
c3a9a790 2676 return -1;
242f8760
RGS		 2677 }
2678 else {
d66cca07
BF		 2679 const SV * const name = (gvsv && SvPOK(gvsv))
2680 ? gvsv
2681 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2682 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2683 Perl_croak(aTHX_ "%s method \"%"SVf256
2684 "\" overloading \"%s\" "\
d0c0e7dd 2685 "in package \"%"HEKf256"\"",
242f8760
RGS		 2686 (GvCVGEN(gv) ? "Stub found while resolving"
2687 : "Can't resolve"),
d66cca07 2688 SVfARG(name), cp,
d0c0e7dd 2689 HEKfARG(
d66cca07 2690 HvNAME_HEK(stash)
d0c0e7dd 2691 ));
242f8760 2692 }
44a8e56a 2693 }
dc848c6f 2694 cv = GvCV(gv = ngv);
44a8e56a 2695 }
b464bac0 2696 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2697 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2698 GvNAME(CvGV(cv))) );
2699 filled = 1;
611c1e95 2700 } else if (gv) { /* Autoloaded... */
ea726b52 2701 cv = MUTABLE_CV(gv);
611c1e95 2702 filled = 1;
44a8e56a 2703 }
ea726b52 2704 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2705
2706 if (gv) {
2707 switch (i) {
2708 case to_sv_amg:
2709 case to_av_amg:
2710 case to_hv_amg:
2711 case to_gv_amg:
2712 case to_cv_amg:
2713 case nomethod_amg:
2714 deref_seen = 1;
2715 break;
2716 }
2717 }
a0d0e21e 2718 }
3d147ac2 2719 if (!deref_seen)
45479970
DM		 2720 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2721 * NB - aux var invalid here, HvARRAY() could have been
2722 * reallocated since it was assigned to */
2723 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2724
a0d0e21e 2725 if (filled) {
a6006777 2726 AMT_AMAGIC_on(&amt);
ad64d0ec 2727 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2728 (char*)&amt, sizeof(AMT));
8c34e50d 2729 return TRUE;
a0d0e21e
LW		 2730 }
2731 }
a6006777 2732 /* Here we have no table: */
8c34e50d 2733 no_table:
a6006777 2734 AMT_AMAGIC_off(&amt);
ad64d0ec 2735 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2736 (char*)&amt, sizeof(AMTS));
c3a9a790 2737 return 0;
a0d0e21e
LW		 2738}
2739
32251b26
IZ		 2740
2741CV*
2742Perl_gv_handler(pTHX_ HV *stash, I32 id)
2743{
3f8f4626 2744 MAGIC *mg;
32251b26 2745 AMT *amtp;
e1a479c5 2746 U32 newgen;
9b439311 2747 struct mro_meta* stash_meta;
32251b26 2748
bfcb3514 2749 if (!stash || !HvNAME_get(stash))
601f1833 2750 return NULL;
e1a479c5 2751
9b439311
BB		 2752 stash_meta = HvMROMETA(stash);
2753 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2754
ad64d0ec 2755 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2756 if (!mg) {
2757 do_update:
8c34e50d 2758 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2759 return NULL;
ad64d0ec 2760 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2761 }
a9fd4e40 2762 assert(mg);
32251b26 2763 amtp = (AMT*)mg->mg_ptr;
66978156 2764 if ( amtp->was_ok_sub != newgen )
32251b26 2765 goto do_update;
3ad83ce7 2766 if (AMT_AMAGIC(amtp)) {
b7787f18 2767 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2768 if (ret && isGV(ret)) { /* Autoloading stab */
2769 /* Passing it through may have resulted in a warning
2770 "Inherited AUTOLOAD for a non-method deprecated", since
2771 our caller is going through a function call, not a method call.
2772 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2773 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2774
2775 if (gv && GvCV(gv))
2776 return GvCV(gv);
2777 }
2778 return ret;
2779 }
a0288114 2780
601f1833 2781 return NULL;
32251b26
IZ		 2782}
2783
2784
6f1401dc
DM		 2785/* Implement tryAMAGICun_MG macro.
2786 Do get magic, then see if the stack arg is overloaded and if so call it.
2787 Flags:
2788 AMGf_set return the arg using SETs rather than assigning to
2789 the targ
2790 AMGf_numeric apply sv_2num to the stack arg.
2791*/
2792
2793bool
2794Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2795 dSP;
2796 SV* tmpsv;
2797 SV* const arg = TOPs;
2798
2799 SvGETMAGIC(arg);
2800
9f8bf298
NC		 2801 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2802 AMGf_noright | AMGf_unary))) {
6f1401dc
DM		 2803 if (flags & AMGf_set) {
2804 SETs(tmpsv);
2805 }
2806 else {
2807 dTARGET;
2808 if (SvPADMY(TARG)) {
2809 sv_setsv(TARG, tmpsv);
2810 SETTARG;
2811 }
2812 else
2813 SETs(tmpsv);
2814 }
2815 PUTBACK;
2816 return TRUE;
2817 }
2818
2819 if ((flags & AMGf_numeric) && SvROK(arg))
2820 *sp = sv_2num(arg);
2821 return FALSE;
2822}
2823
2824
2825/* Implement tryAMAGICbin_MG macro.
2826 Do get magic, then see if the two stack args are overloaded and if so
2827 call it.
2828 Flags:
2829 AMGf_set return the arg using SETs rather than assigning to
2830 the targ
2831 AMGf_assign op may be called as mutator (eg +=)
2832 AMGf_numeric apply sv_2num to the stack arg.
2833*/
2834
2835bool
2836Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 2837 dSP;
2838 SV* const left = TOPm1s;
2839 SV* const right = TOPs;
2840
2841 SvGETMAGIC(left);
2842 if (left != right)
2843 SvGETMAGIC(right);
2844
2845 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2846 SV * const tmpsv = amagic_call(left, right, method,
2847 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2848 if (tmpsv) {
2849 if (flags & AMGf_set) {
2850 (void)POPs;
2851 SETs(tmpsv);
2852 }
2853 else {
2854 dATARGET;
2855 (void)POPs;
2856 if (opASSIGN || SvPADMY(TARG)) {
2857 sv_setsv(TARG, tmpsv);
2858 SETTARG;
2859 }
2860 else
2861 SETs(tmpsv);
2862 }
2863 PUTBACK;
2864 return TRUE;
2865 }
2866 }
75ea7a12
FC		 2867 if(left==right && SvGMAGICAL(left)) {
2868 SV * const left = sv_newmortal();
2869 *(sp-1) = left;
2870 /* Print the uninitialized warning now, so it includes the vari-
2871 able name. */
2872 if (!SvOK(right)) {
2873 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2874 sv_setsv_flags(left, &PL_sv_no, 0);
2875 }
2876 else sv_setsv_flags(left, right, 0);
2877 SvGETMAGIC(right);
2878 }
6f1401dc 2879 if (flags & AMGf_numeric) {
75ea7a12
FC		 2880 if (SvROK(TOPm1s))
2881 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2882 if (SvROK(right))
2883 *sp = sv_2num(right);
2884 }
2885 return FALSE;
2886}
2887
25a9ffce
NC		 2888SV *
2889Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2890 SV *tmpsv = NULL;
3d147ac2 2891 HV *stash;
25a9ffce
NC		 2892
2893 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2894
3d147ac2
DM		 2895 if (!SvAMAGIC(ref))
2896 return ref;
2897 /* return quickly if none of the deref ops are overloaded */
2898 stash = SvSTASH(SvRV(ref));
2899 assert(SvOOK(stash));
2900 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2901 return ref;
2902
2903 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 2904 AMGf_noright | AMGf_unary))) {
2905 if (!SvROK(tmpsv))
2906 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2907 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2908 /* Bail out if it returns us the same reference. */
2909 return tmpsv;
2910 }
2911 ref = tmpsv;
3d147ac2
DM		 2912 if (!SvAMAGIC(ref))
2913 break;
25a9ffce
NC		 2914 }
2915 return tmpsv ? tmpsv : ref;
2916}
6f1401dc 2917
8d569291
FC		 2918bool
2919Perl_amagic_is_enabled(pTHX_ int method)
2920{
2921 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2922
2923 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2924
2925 if ( !lex_mask || !SvOK(lex_mask) )
2926 /* overloading lexically disabled */
2927 return FALSE;
2928 else if ( lex_mask && SvPOK(lex_mask) ) {
2929 /* we have an entry in the hints hash, check if method has been
2930 * masked by overloading.pm */
2931 STRLEN len;
2932 const int offset = method / 8;
2933 const int bit = method % 8;
2934 char *pv = SvPV(lex_mask, len);
2935
2936 /* Bit set, so this overloading operator is disabled */
2937 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2938 return FALSE;
2939 }
2940 return TRUE;
2941}
2942
a0d0e21e 2943SV*
864dbfa3 2944Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2945{
27da23d5 2946 dVAR;
b267980d 2947 MAGIC *mg;
9c5ffd7c 2948 CV *cv=NULL;
a0d0e21e 2949 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2950 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 2951 int off = 0, off1, lr = 0, notfound = 0;
2952 int postpr = 0, force_cpy = 0;
2953 int assign = AMGf_assign & flags;
2954 const int assignshift = assign ? 1 : 0;
bf5522a1 2955 int use_default_op = 0;
67288365 2956 int force_scalar = 0;
497b47a8
JH		 2957#ifdef DEBUGGING
2958 int fl=0;
497b47a8 2959#endif
25716404 2960 HV* stash=NULL;
7918f24d
NC		 2961
2962 PERL_ARGS_ASSERT_AMAGIC_CALL;
2963
e46c382e 2964 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2965 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 2966 }
2967
a0d0e21e 2968 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2969 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2970 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2971 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2972 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2973 : NULL))
b267980d 2974 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 2975 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2976 * usual method */
497b47a8
JH		 2977 (
2978#ifdef DEBUGGING
2979 fl = 1,
a0288114 2980#endif
497b47a8 2981 cv = cvp[off=method])))) {
a0d0e21e
LW		 2982 lr = -1; /* Call method for left argument */
2983 } else {
2984 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2985 int logic;
2986
2987 /* look for substituted methods */
ee239bfe 2988 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 2989 switch (method) {
2990 case inc_amg:
ee239bfe
IZ		 2991 force_cpy = 1;
2992 if ((cv = cvp[off=add_ass_amg])
2993 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2994 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2995 }
2996 break;
2997 case dec_amg:
ee239bfe
IZ		 2998 force_cpy = 1;
2999 if ((cv = cvp[off = subtr_ass_amg])
3000 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3001 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3002 }
3003 break;
3004 case bool__amg:
3005 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3006 break;
3007 case numer_amg:
3008 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3009 break;
3010 case string_amg:
3011 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3012 break;
b7787f18
AL		 3013 case not_amg:
3014 (void)((cv = cvp[off=bool__amg])
3015 || (cv = cvp[off=numer_amg])
3016 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 3017 if (cv)
3018 postpr = 1;
b7787f18 3019 break;
748a9306
LW		 3020 case copy_amg:
3021 {
76e3520e
GS		 3022 /*
3023 * SV* ref causes confusion with the interpreter variable of
3024 * the same name
3025 */
890ce7af 3026 SV* const tmpRef=SvRV(left);
76e3520e 3027 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 3028 /*
3029 * Just to be extra cautious. Maybe in some
3030 * additional cases sv_setsv is safe, too.
3031 */
890ce7af 3032 SV* const newref = newSVsv(tmpRef);
748a9306 3033 SvOBJECT_on(newref);
a1cd65be
FC		 3034 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3035 delegate to the stash. */
85fbaab2 3036 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 3037 return newref;
3038 }
3039 }
3040 break;
a0d0e21e 3041 case abs_amg:
b267980d 3042 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3043 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3044 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3045 if (off1==lt_amg) {
890ce7af 3046 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3047 lt_amg,AMGf_noright);
3048 logic = SvTRUE(lessp);
3049 } else {
890ce7af 3050 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3051 ncmp_amg,AMGf_noright);
3052 logic = (SvNV(lessp) < 0);
3053 }
3054 if (logic) {
3055 if (off==subtr_amg) {
3056 right = left;
748a9306 3057 left = nullsv;
a0d0e21e
LW		 3058 lr = 1;
3059 }
3060 } else {
3061 return left;
3062 }
3063 }
3064 break;
3065 case neg_amg:
155aba94 3066 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 3067 right = left;
3068 left = sv_2mortal(newSViv(0));
3069 lr = 1;
3070 }
3071 break;
f216259d 3072 case int_amg:
f5284f61 3073 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3074 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3075 case regexp_amg:
b267980d
NIS		 3076 /* FAIL safe */
3077 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3078
f5284f61
IZ		 3079 case to_sv_amg:
3080 case to_av_amg:
3081 case to_hv_amg:
3082 case to_gv_amg:
3083 case to_cv_amg:
3084 /* FAIL safe */
b267980d 3085 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3086
a0d0e21e
LW		 3087 default:
3088 goto not_found;
3089 }
3090 if (!cv) goto not_found;
3091 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3092 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3093 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3094 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3095 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3096 : NULL))
69815d08
RS		 3097 && (cv = cvp[off=method])) { /* Method for right
3098 * argument found */
3099 lr=1;
bf5522a1
MB		 3100 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3101 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 3102 && !(flags & AMGf_unary)) {
3103 /* We look for substitution for
3104 * comparison operations and
fc36a67e 3105 * concatenation */
a0d0e21e
LW		 3106 if (method==concat_amg || method==concat_ass_amg
3107 || method==repeat_amg || method==repeat_ass_amg) {
3108 return NULL; /* Delegate operation to string conversion */
3109 }
3110 off = -1;
3111 switch (method) {
3112 case lt_amg:
3113 case le_amg:
3114 case gt_amg:
3115 case ge_amg:
3116 case eq_amg:
3117 case ne_amg:
2ab54efd
MB		 3118 off = ncmp_amg;
3119 break;
a0d0e21e
LW		 3120 case slt_amg:
3121 case sle_amg:
3122 case sgt_amg:
3123 case sge_amg:
3124 case seq_amg:
3125 case sne_amg:
2ab54efd
MB		 3126 off = scmp_amg;
3127 break;
a0d0e21e 3128 }
bf5522a1
MB		 3129 if (off != -1) {
3130 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3131 cv = ocvp[off];
3132 lr = -1;
3133 }
3134 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3135 cv = cvp[off];
3136 lr = 1;
3137 }
3138 }
3139 if (cv)
2ab54efd
MB		 3140 postpr = 1;
3141 else
3142 goto not_found;
a0d0e21e 3143 } else {
a6006777 3144 not_found: /* No method found, either report or croak */
b267980d
NIS		 3145 switch (method) {
3146 case to_sv_amg:
3147 case to_av_amg:
3148 case to_hv_amg:
3149 case to_gv_amg:
3150 case to_cv_amg:
3151 /* FAIL safe */
3152 return left; /* Delegate operation to standard mechanisms. */
b267980d 3153 }
a0d0e21e
LW		 3154 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3155 notfound = 1; lr = -1;
3156 } else if (cvp && (cv=cvp[nomethod_amg])) {
3157 notfound = 1; lr = 1;
bf5522a1
MB		 3158 } else if ((use_default_op =
3159 (!ocvp || oamtp->fallback >= AMGfallYES)
3160 && (!cvp || amtp->fallback >= AMGfallYES))
3161 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3162 /* Skip generating the "no method found" message. */
3163 return NULL;
a0d0e21e 3164 } else {
46fc3d4c 3165 SV *msg;
774d564b 3166 if (off==-1) off=method;
b267980d 3167 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3168 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3169 AMG_id2name(method + assignshift),
3170 (flags & AMGf_unary ? " " : "\n\tleft "),
3171 SvAMAGIC(left)?
3172 "in overloaded package ":
3173 "has no overloaded magic",
3174 SvAMAGIC(left)?
3175 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3176 SVfARG(&PL_sv_no),
3177 SvAMAGIC(right)?
3178 ",\n\tright argument in overloaded package ":
3179 (flags & AMGf_unary
3180 ? ""
3181 : ",\n\tright argument has no overloaded magic"),
3182 SvAMAGIC(right)?
3183 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3184 SVfARG(&PL_sv_no)));
bf5522a1 3185 if (use_default_op) {
d66cca07 3186 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3187 } else {
be2597df 3188 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3189 }
3190 return NULL;
3191 }
ee239bfe 3192 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3193 }
3194 }
67288365
JL		 3195
3196 switch (method) {
3197 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3198 * operation. we need this to return a value, so that it can be assigned
3199 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3200 * increment or decrement was itself called in void context */
3201 case inc_amg:
3202 if (off == add_amg)
3203 force_scalar = 1;
3204 break;
3205 case dec_amg:
3206 if (off == subtr_amg)
3207 force_scalar = 1;
3208 break;
3209 /* in these cases, we're calling an assignment variant of an operator
3210 * (+= rather than +, for instance). regardless of whether it's a
3211 * fallback or not, it always has to return a value, which will be
3212 * assigned to the proper variable later */
3213 case add_amg:
3214 case subtr_amg:
3215 case mult_amg:
3216 case div_amg:
3217 case modulo_amg:
3218 case pow_amg:
3219 case lshift_amg:
3220 case rshift_amg:
3221 case repeat_amg:
3222 case concat_amg:
3223 case band_amg:
3224 case bor_amg:
3225 case bxor_amg:
3226 if (assign)
3227 force_scalar = 1;
3228 break;
3229 /* the copy constructor always needs to return a value */
3230 case copy_amg:
3231 force_scalar = 1;
3232 break;
3233 /* because of the way these are implemented (they don't perform the
3234 * dereferencing themselves, they return a reference that perl then
3235 * dereferences later), they always have to be in scalar context */
3236 case to_sv_amg:
3237 case to_av_amg:
3238 case to_hv_amg:
3239 case to_gv_amg:
3240 case to_cv_amg:
3241 force_scalar = 1;
3242 break;
3243 /* these don't have an op of their own; they're triggered by their parent
3244 * op, so the context there isn't meaningful ('$a and foo()' in void
3245 * context still needs to pass scalar context on to $a's bool overload) */
3246 case bool__amg:
3247 case numer_amg:
3248 case string_amg:
3249 force_scalar = 1;
3250 break;
3251 }
3252
497b47a8 3253#ifdef DEBUGGING
a0d0e21e 3254 if (!notfound) {
497b47a8 3255 DEBUG_o(Perl_deb(aTHX_
d66cca07 3256 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3257 AMG_id2name(off),
3258 method+assignshift==off? "" :
a0288114 3259 " (initially \"",
497b47a8
JH		 3260 method+assignshift==off? "" :
3261 AMG_id2name(method+assignshift),
a0288114 3262 method+assignshift==off? "" : "\")",
497b47a8
JH		 3263 flags & AMGf_unary? "" :
3264 lr==1 ? " for right argument": " for left argument",
3265 flags & AMGf_unary? " for argument" : "",
d66cca07 3266 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3267 fl? ",\n\tassignment variant used": "") );
ee239bfe 3268 }
497b47a8 3269#endif
748a9306
LW		 3270 /* Since we use shallow copy during assignment, we need
3271 * to dublicate the contents, probably calling user-supplied
3272 * version of copy operator
3273 */
ee239bfe
IZ		 3274 /* We need to copy in following cases:
3275 * a) Assignment form was called.
3276 * assignshift==1, assign==T, method + 1 == off
3277 * b) Increment or decrement, called directly.
3278 * assignshift==0, assign==0, method + 0 == off
3279 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3280 * assignshift==0, assign==T,
ee239bfe
IZ		 3281 * force_cpy == T
3282 * d) Increment or decrement, translated to nomethod.
b267980d 3283 * assignshift==0, assign==0,
ee239bfe
IZ		 3284 * force_cpy == T
3285 * e) Assignment form translated to nomethod.
3286 * assignshift==1, assign==T, method + 1 != off
3287 * force_cpy == T
3288 */
3289 /* off is method, method+assignshift, or a result of opcode substitution.
3290 * In the latter case assignshift==0, so only notfound case is important.
3291 */
73512201 3292 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3293 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3294 || force_cpy) )
6f1401dc 3295 {
1b38c28e
NC		 3296 /* newSVsv does not behave as advertised, so we copy missing
3297 * information by hand */
3298 SV *tmpRef = SvRV(left);
3299 SV *rv_copy;
31d632c3 3300 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3301 SvRV_set(left, rv_copy);
3302 SvSETMAGIC(left);
e7881358 3303 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3304 }
6f1401dc
DM		 3305 }
3306
a0d0e21e
LW		 3307 {
3308 dSP;
3309 BINOP myop;
3310 SV* res;
b7787f18 3311 const bool oldcatch = CATCH_GET;
67288365
JL		 3312 I32 oldmark, nret;
3313 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3314
54310121 3315 CATCH_SET(TRUE);
a0d0e21e
LW		 3316 Zero(&myop, 1, BINOP);
3317 myop.op_last = (OP *) &myop;
b37c2d43 3318 myop.op_next = NULL;
67288365
JL		 3319 myop.op_flags = OPf_STACKED;
3320
3321 switch (gimme) {
3322 case G_VOID:
3323 myop.op_flags |= OPf_WANT_VOID;
3324 break;
3325 case G_ARRAY:
3326 if (flags & AMGf_want_list) {
3327 myop.op_flags |= OPf_WANT_LIST;
3328 break;
3329 }
3330 /* FALLTHROUGH */
3331 default:
3332 myop.op_flags |= OPf_WANT_SCALAR;
3333 break;
3334 }
a0d0e21e 3335
e788e7d3 3336 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3337 ENTER;
462e5cf6 3338 SAVEOP();
533c011a 3339 PL_op = (OP *) &myop;
3280af22 3340 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3341 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3342 Perl_pp_pushmark(aTHX);
a0d0e21e 3343
924508f0 3344 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3345 PUSHs(lr>0? right: left);
3346 PUSHs(lr>0? left: right);
3280af22 3347 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3348 if (notfound) {
59cd0e26
NC		 3349 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3350 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3351 }
ad64d0ec 3352 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3353 PUTBACK;
67288365 3354 oldmark = TOPMARK;
a0d0e21e 3355
139d0ce6 3356 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3357 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3358 LEAVE;
3359 SPAGAIN;
67288365
JL		 3360 nret = SP - (PL_stack_base + oldmark);
3361
3362 switch (gimme) {
3363 case G_VOID:
3364 /* returning NULL has another meaning, and we check the context
3365 * at the call site too, so this can be differentiated from the
3366 * scalar case */
3367 res = &PL_sv_undef;
3368 SP = PL_stack_base + oldmark;
3369 break;
3370 case G_ARRAY: {
3371 if (flags & AMGf_want_list) {
3372 res = sv_2mortal((SV *)newAV());
3373 av_extend((AV *)res, nret);
3374 while (nret--)
3375 av_store((AV *)res, nret, POPs);
3376 break;
3377 }
3378 /* FALLTHROUGH */
3379 }
3380 default:
3381 res = POPs;
3382 break;
3383 }
a0d0e21e 3384
ebafeae7 3385 PUTBACK;
d3acc0f7 3386 POPSTACK;
54310121 3387 CATCH_SET(oldcatch);
a0d0e21e 3388
a0d0e21e 3389 if (postpr) {
b7787f18 3390 int ans;
a0d0e21e
LW		 3391 switch (method) {
3392 case le_amg:
3393 case sle_amg:
3394 ans=SvIV(res)<=0; break;
3395 case lt_amg:
3396 case slt_amg:
3397 ans=SvIV(res)<0; break;
3398 case ge_amg:
3399 case sge_amg:
3400 ans=SvIV(res)>=0; break;
3401 case gt_amg:
3402 case sgt_amg:
3403 ans=SvIV(res)>0; break;
3404 case eq_amg:
3405 case seq_amg:
3406 ans=SvIV(res)==0; break;
3407 case ne_amg:
3408 case sne_amg:
3409 ans=SvIV(res)!=0; break;
3410 case inc_amg:
3411 case dec_amg:
bbce6d69 3412 SvSetSV(left,res); return left;
dc437b57 3413 case not_amg:
fe7ac86a 3414 ans=!SvTRUE(res); break;
b7787f18
AL		 3415 default:
3416 ans=0; break;
a0d0e21e 3417 }
54310121 3418 return boolSV(ans);
748a9306
LW		 3419 } else if (method==copy_amg) {
3420 if (!SvROK(res)) {
cea2e8a9 3421 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3422 }
3423 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3424 } else {
3425 return res;
3426 }
3427 }
3428}
c9d5ac95 3429
f5c1e807
NC		 3430void
3431Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3432{
3433 dVAR;
acda4c6a 3434 U32 hash;
f5c1e807 3435
7918f24d 3436 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3437
acda4c6a
NC		 3438 if (len > I32_MAX)
3439 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3440
ae8cc45f
NC		 3441 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3442 unshare_hek(GvNAME_HEK(gv));
3443 }
3444
acda4c6a 3445 PERL_HASH(hash, name, len);
c60dbbc3 3446 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3447}
3448
66610fdd 3449/*
f7461760
Z		 3450=for apidoc gv_try_downgrade
3451
2867cdbc
Z		 3452If the typeglob C<gv> can be expressed more succinctly, by having
3453something other than a real GV in its place in the stash, replace it
3454with the optimised form. Basic requirements for this are that C<gv>
3455is a real typeglob, is sufficiently ordinary, and is only referenced
3456from its package. This function is meant to be used when a GV has been
3457looked up in part to see what was there, causing upgrading, but based
3458on what was found it turns out that the real GV isn't required after all.
3459
3460If C<gv> is a completely empty typeglob, it is deleted from the stash.
3461
3462If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3463sub, the typeglob is replaced with a scalar-reference placeholder that
3464more compactly represents the same thing.
f7461760
Z		 3465
3466=cut
3467*/
3468
3469void
3470Perl_gv_try_downgrade(pTHX_ GV *gv)
3471{
3472 HV *stash;
3473 CV *cv;
3474 HEK *namehek;
3475 SV **gvp;
3476 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3477
3478 /* XXX Why and where does this leave dangling pointers during global
3479 destruction? */
627364f1 3480 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3481
2867cdbc 3482 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3483 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3484 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3485 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3486 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3487 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3488 return;
2be08ad1
FC		 3489 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3490 return;
803f2748
DM		 3491 if (SvMAGICAL(gv)) {
3492 MAGIC *mg;
3493 /* only backref magic is allowed */
3494 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3495 return;
3496 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3497 if (mg->mg_type != PERL_MAGIC_backref)
3498 return;
3499 }
3500 }
2867cdbc
Z		 3501 cv = GvCV(gv);
3502 if (!cv) {
3503 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3504 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3505 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3506 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3507 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z		 3508 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3509 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3510 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3511 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3512 *gvp == (SV*)gv) {
3513 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3514 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3515 SvREFCNT(gv) = 0;
3516 sv_clear((SV*)gv);
3517 SvREFCNT(gv) = 1;
70e5f2b5 3518 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
f7461760
Z		 3519 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3520 STRUCT_OFFSET(XPVIV, xiv_iv));
3521 SvRV_set(gv, value);
3522 }
3523}
3524
9e3fb20c
FC		 3525GV *
3526Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3527{
3528 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3529 GV * const *gvp;
3530 PERL_ARGS_ASSERT_GV_OVERRIDE;
3531 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3532 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3533 gv = gvp ? *gvp : NULL;
3534 if (gv && !isGV(gv)) {
3535 if (!SvPCS_IMPORTED(gv)) return NULL;
3536 gv_init(gv, PL_globalstash, name, len, 0);
3537 return gv;
3538 }
3539 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3540}
3541
4aaa4757
FC		 3542#include "XSUB.h"
3543
3544static void
3545core_xsub(pTHX_ CV* cv)
3546{
3547 Perl_croak(aTHX_
3548 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3549 );
3550}
3551
f7461760 3552/*
66610fdd
RGS		 3553 * Local variables:
3554 * c-indentation-style: bsd
3555 * c-basic-offset: 4
14d04a33 3556 * indent-tabs-mode: nil
66610fdd
RGS		 3557 * End:
3558 *
14d04a33 3559 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3560 */
Unnamed repository; edit this file 'description' to name the repository.