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fix special-case recreation of *::
[perl5.git] / gv.c
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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW
20 */
21
ccfc67b7
JH
22/*
23=head1 GV Functions
166f8a29
DM
24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH
32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
6ffcffbd 37#include "overload.inc"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a 41static const char S_autoload[] = "AUTOLOAD";
3c81f0b3 42#define S_autolen (sizeof("AUTOLOAD")-1)
5c7983e5 43
13c59d41
MH
44GV *
45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13c59d41
MH
49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
13be902c 53 && SvTYPE((const SV *)gv) != SVt_PVLV
13c59d41 54 )
13be902c 55 ) {
bb85b28a 56 const char *what;
13c59d41 57 if (type == SVt_PVIO) {
bb85b28a
NC
58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
13c59d41 64 } else if (type == SVt_PVHV) {
bb85b28a
NC
65 what = "hash";
66 } else {
13c59d41 67 what = type == SVt_PVAV ? "array" : "scalar";
bb85b28a 68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896 72
13c59d41
MH
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
13c59d41
MH
83 if (!*where)
84 {
85 *where = newSV_type(type);
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
4c4f3c46 87 && strEQs(GvNAME(gv), "ISA"))
13c59d41 88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
e17aed30 89 }
13c59d41 90 return gv;
79072805
LW
91}
92
93GV *
864dbfa3 94Perl_gv_fetchfile(pTHX_ const char *name)
79072805 95{
7918f24d 96 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC
97 return gv_fetchfile_flags(name, strlen(name), 0);
98}
99
100GV *
101Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
102 const U32 flags)
103{
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW
107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC
110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS
116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS
120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC
122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
c7a622b3 132 if (PERLDB_LINE_OR_SAVESRC && !GvAV(gv))
43e4250a 133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
53d95988
CS
134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW
136 return gv;
137}
138
62d55b22
NC
139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
796b6530 145C<NULL>.
62d55b22
NC
146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d 153 PERL_ARGS_ASSERT_GV_CONST_SV;
23491f1d 154 PERL_UNUSED_CONTEXT;
7918f24d 155
62d55b22
NC
156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
16a6e5a4 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV && SvTYPE(SvRV(gv)) != SVt_PVCV ? SvRV(gv) : NULL;
62d55b22
NC
159}
160
12816592
NC
161GP *
162Perl_newGP(pTHX_ GV *const gv)
163{
164 GP *gp;
19bad673 165 U32 hash;
19bad673
NC
166 const char *file;
167 STRLEN len;
2639089b 168#ifndef USE_ITHREADS
6b352265 169 GV *filegv;
2639089b 170#endif
c2587955 171 dVAR;
19bad673 172
7918f24d 173 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD
174 Newxz(gp, 1, GP);
175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
176#ifndef PERL_DONT_CREATE_GVSV
177 gp->gp_sv = newSV(0);
178#endif
7918f24d 179
c947bc1d
FC
180 /* PL_curcop may be null here. E.g.,
181 INIT { bless {} and exit }
182 frees INIT before looking up DESTROY (and creating *DESTROY)
183 */
2639089b
DD
184 if (PL_curcop) {
185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 186#ifdef USE_ITHREADS
2639089b
DD
187 if (CopFILE(PL_curcop)) {
188 file = CopFILE(PL_curcop);
189 len = strlen(file);
190 }
2639089b 191#else
cb0d3385
FC
192 filegv = CopFILEGV(PL_curcop);
193 if (filegv) {
194 file = GvNAME(filegv)+2;
195 len = GvNAMELEN(filegv)-2;
196 }
6e314d4f 197#endif
cb0d3385
FC
198 else goto no_file;
199 }
200 else {
201 no_file:
19bad673
NC
202 file = "";
203 len = 0;
204 }
f4890806
NC
205
206 PERL_HASH(hash, file, len);
f4890806 207 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC
208 gp->gp_refcnt = 1;
209
210 return gp;
211}
212
803f2748
DM
213/* Assign CvGV(cv) = gv, handling weak references.
214 * See also S_anonymise_cv_maybe */
215
216void
217Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
218{
ae77754a 219 GV * const oldgv = CvNAMED(cv) ? NULL : SvANY(cv)->xcv_gv_u.xcv_gv;
b290562e 220 HEK *hek;
803f2748
DM
221 PERL_ARGS_ASSERT_CVGV_SET;
222
223 if (oldgv == gv)
224 return;
225
226 if (oldgv) {
cfc1e951 227 if (CvCVGV_RC(cv)) {
e7881358 228 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM
229 CvCVGV_RC_off(cv);
230 }
803f2748 231 else {
803f2748
DM
232 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
233 }
234 }
db5cc3ee
FC
235 else if ((hek = CvNAME_HEK(cv))) {
236 unshare_hek(hek);
f3feca7a 237 CvLEXICAL_off(cv);
db5cc3ee 238 }
803f2748 239
5988f306 240 CvNAMED_off(cv);
b290562e 241 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 242 assert(!CvCVGV_RC(cv));
803f2748
DM
243
244 if (!gv)
245 return;
246
c794ca97
DM
247 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
248 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
249 else {
cfc1e951 250 CvCVGV_RC_on(cv);
803f2748
DM
251 SvREFCNT_inc_simple_void_NN(gv);
252 }
803f2748
DM
253}
254
ae77754a
FC
255/* Convert CvSTASH + CvNAME_HEK into a GV. Conceptually, all subs have a
256 GV, but for efficiency that GV may not in fact exist. This function,
257 called by CvGV, reifies it. */
258
259GV *
260Perl_cvgv_from_hek(pTHX_ CV *cv)
261{
262 GV *gv;
2eaf799e 263 SV **svp;
ae77754a
FC
264 PERL_ARGS_ASSERT_CVGV_FROM_HEK;
265 assert(SvTYPE(cv) == SVt_PVCV);
266 if (!CvSTASH(cv)) return NULL;
267 ASSUME(CvNAME_HEK(cv));
2eaf799e
FC
268 svp = hv_fetchhek(CvSTASH(cv), CvNAME_HEK(cv), 0);
269 gv = MUTABLE_GV(svp && *svp ? *svp : newSV(0));
270 if (!isGV(gv))
271 gv_init_pvn(gv, CvSTASH(cv), HEK_KEY(CvNAME_HEK(cv)),
ae77754a
FC
272 HEK_LEN(CvNAME_HEK(cv)),
273 SVf_UTF8 * !!HEK_UTF8(CvNAME_HEK(cv)));
2eaf799e
FC
274 if (!CvNAMED(cv)) { /* gv_init took care of it */
275 assert (SvANY(cv)->xcv_gv_u.xcv_gv == gv);
276 return gv;
277 }
ae77754a
FC
278 unshare_hek(CvNAME_HEK(cv));
279 CvNAMED_off(cv);
280 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
2eaf799e 281 if (svp && *svp) SvREFCNT_inc_simple_void_NN(gv);
ae77754a
FC
282 CvCVGV_RC_on(cv);
283 return gv;
284}
285
c68d9564
Z
286/* Assign CvSTASH(cv) = st, handling weak references. */
287
288void
289Perl_cvstash_set(pTHX_ CV *cv, HV *st)
290{
291 HV *oldst = CvSTASH(cv);
292 PERL_ARGS_ASSERT_CVSTASH_SET;
293 if (oldst == st)
294 return;
295 if (oldst)
296 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
297 SvANY(cv)->xcv_stash = st;
298 if (st)
299 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
300}
803f2748 301
e1104062
FC
302/*
303=for apidoc gv_init_pvn
304
305Converts a scalar into a typeglob. This is an incoercible typeglob;
306assigning a reference to it will assign to one of its slots, instead of
796b6530
KW
307overwriting it as happens with typeglobs created by C<SvSetSV>. Converting
308any scalar that is C<SvOK()> may produce unpredictable results and is reserved
e1104062
FC
309for perl's internal use.
310
311C<gv> is the scalar to be converted.
312
313C<stash> is the parent stash/package, if any.
314
04ec7e59
FC
315C<name> and C<len> give the name. The name must be unqualified;
316that is, it must not include the package name. If C<gv> is a
e1104062
FC
317stash element, it is the caller's responsibility to ensure that the name
318passed to this function matches the name of the element. If it does not
319match, perl's internal bookkeeping will get out of sync.
320
4a4088c4 321C<flags> can be set to C<SVf_UTF8> if C<name> is a UTF-8 string, or
04ec7e59 322the return value of SvUTF8(sv). It can also take the
796b6530 323C<GV_ADDMULTI> flag, which means to pretend that the GV has been
e1104062
FC
324seen before (i.e., suppress "Used once" warnings).
325
326=for apidoc gv_init
327
4a4088c4 328The old form of C<gv_init_pvn()>. It does not work with UTF-8 strings, as it
04ec7e59 329has no flags parameter. If the C<multi> parameter is set, the
796b6530 330C<GV_ADDMULTI> flag will be passed to C<gv_init_pvn()>.
e1104062
FC
331
332=for apidoc gv_init_pv
333
796b6530 334Same as C<gv_init_pvn()>, but takes a nul-terminated string for the name
e1104062
FC
335instead of separate char * and length parameters.
336
337=for apidoc gv_init_sv
338
796b6530 339Same as C<gv_init_pvn()>, but takes an SV * for the name instead of separate
e1104062
FC
340char * and length parameters. C<flags> is currently unused.
341
342=cut
343*/
344
463ee0b2 345void
04ec7e59 346Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF
347{
348 char *namepv;
349 STRLEN namelen;
350 PERL_ARGS_ASSERT_GV_INIT_SV;
351 namepv = SvPV(namesv, namelen);
352 if (SvUTF8(namesv))
353 flags |= SVf_UTF8;
04ec7e59 354 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF
355}
356
357void
04ec7e59 358Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF
359{
360 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 361 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF
362}
363
364void
04ec7e59 365Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 366{
3b6733bf
NC
367 const U32 old_type = SvTYPE(gv);
368 const bool doproto = old_type > SVt_NULL;
f9509170 369 char * const proto = (doproto && SvPOK(gv))
dad95a0a 370 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 371 : NULL;
49a54bbe 372 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 373 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 374 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 375 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 376
e6066781 377 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC
378 assert (!(proto && has_constant));
379
380 if (has_constant) {
2eaf799e 381 /* The constant has to be a scalar, array or subroutine. */
5c1f4d79 382 switch (SvTYPE(has_constant)) {
5c1f4d79 383 case SVt_PVHV:
5c1f4d79
NC
384 case SVt_PVFM:
385 case SVt_PVIO:
386 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
387 sv_reftype(has_constant, 0));
4bbde2f7 388 break;
81d52ecd 389
42d0e0b7 390 default: NOOP;
5c1f4d79 391 }
756cb477
NC
392 SvRV_set(gv, NULL);
393 SvROK_off(gv);
394 }
463ee0b2 395
3b6733bf
NC
396
397 if (old_type < SVt_PVGV) {
398 if (old_type >= SVt_PV)
399 SvCUR_set(gv, 0);
ad64d0ec 400 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 401 }
55d729e4
GS
402 if (SvLEN(gv)) {
403 if (proto) {
f880fe2f 404 SvPV_set(gv, NULL);
b162af07 405 SvLEN_set(gv, 0);
55d729e4
GS
406 SvPOK_off(gv);
407 } else
94010e71 408 Safefree(SvPVX_mutable(gv));
55d729e4 409 }
2e5b91de
NC
410 SvIOK_off(gv);
411 isGV_with_GP_on(gv);
12816592 412
c43ae56f 413 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC
414 GvSTASH(gv) = stash;
415 if (stash)
ad64d0ec 416 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 417 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC
418 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
419 GvMULTI_on(gv); /* _was_ mentioned */
2eaf799e
FC
420 if (has_constant && SvTYPE(has_constant) == SVt_PVCV) {
421 /* Not actually a constant. Just a regular sub. */
422 CV * const cv = (CV *)has_constant;
423 GvCV_set(gv,cv);
424 if (CvSTASH(cv) == stash && (
425 CvNAME_HEK(cv) == GvNAME_HEK(gv)
426 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
427 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
428 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
429 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
430 )
431 ))
432 CvGV_set(cv,gv);
433 }
434 else if (doproto) {
e3d2b9e7 435 CV *cv;
756cb477
NC
436 if (has_constant) {
437 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 438 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC
439 /* In case op.c:S_process_special_blocks stole it: */
440 if (!GvCV(gv))
c43ae56f 441 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 442 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC
443 /* If this reference was a copy of another, then the subroutine
444 must have been "imported", by a Perl space assignment to a GV
445 from a reference to CV. */
446 if (exported_constant)
447 GvIMPORTED_CV_on(gv);
186a5ba8 448 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 449 } else {
186a5ba8 450 cv = newSTUB(gv,1);
756cb477 451 }
55d729e4 452 if (proto) {
e3d2b9e7 453 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 454 SV_HAS_TRAILING_NUL);
e0260a5b 455 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS
456 }
457 }
463ee0b2
LW
458}
459
76e3520e 460STATIC void
e6066781 461S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 462{
13c59d41
MH
463 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
464
465 switch (sv_type) {
466 case SVt_PVIO:
467 (void)GvIOn(gv);
468 break;
469 case SVt_PVAV:
470 (void)GvAVn(gv);
471 break;
472 case SVt_PVHV:
473 (void)GvHVn(gv);
474 break;
c69033f2 475#ifdef PERL_DONT_CREATE_GVSV
13c59d41
MH
476 case SVt_NULL:
477 case SVt_PVCV:
478 case SVt_PVFM:
479 case SVt_PVGV:
480 break;
481 default:
482 if(GvSVn(gv)) {
483 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
484 If we just cast GvSVn(gv) to void, it ignores evaluating it for
485 its side effect */
486 }
c69033f2 487#endif
a0d0e21e
LW
488 }
489}
490
0f8d4b5e
FC
491static void core_xsub(pTHX_ CV* cv);
492
493static GV *
494S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 495 const char * const name, const STRLEN len)
0f8d4b5e
FC
496{
497 const int code = keyword(name, len, 1);
498 static const char file[] = __FILE__;
97021f77 499 CV *cv, *oldcompcv = NULL;
0f8d4b5e 500 int opnum = 0;
0f8d4b5e 501 bool ampable = TRUE; /* &{}-able */
97021f77
FC
502 COP *oldcurcop = NULL;
503 yy_parser *oldparser = NULL;
504 I32 oldsavestack_ix = 0;
0f8d4b5e
FC
505
506 assert(gv || stash);
507 assert(name);
0f8d4b5e 508
88b892d8
FC
509 if (!code) return NULL; /* Not a keyword */
510 switch (code < 0 ? -code : code) {
0f8d4b5e 511 /* no support for \&CORE::infix;
d885f758 512 no support for funcs that do not parse like funcs */
88b892d8 513 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 514 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 515 case KEY_default : case KEY_DESTROY:
88b892d8 516 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 517 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 518 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 519 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC
520 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
521 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
522 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 523 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 524 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 525 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 526 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 527 case KEY_state: case KEY_sub :
46bef06f 528 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC
529 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
530 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC
531 return NULL;
532 case KEY_chdir:
eb31eb35 533 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
73665bc4 534 case KEY_eof : case KEY_exec: case KEY_exists :
0f8d4b5e 535 case KEY_lstat:
bea284c8 536 case KEY_split:
0f8d4b5e
FC
537 case KEY_stat:
538 case KEY_system:
539 case KEY_truncate: case KEY_unlink:
0f8d4b5e
FC
540 ampable = FALSE;
541 }
542 if (!gv) {
543 gv = (GV *)newSV(0);
544 gv_init(gv, stash, name, len, TRUE);
545 }
7e68c38b 546 GvMULTI_on(gv);
0f8d4b5e
FC
547 if (ampable) {
548 ENTER;
549 oldcurcop = PL_curcop;
550 oldparser = PL_parser;
551 lex_start(NULL, NULL, 0);
552 oldcompcv = PL_compcv;
553 PL_compcv = NULL; /* Prevent start_subparse from setting
554 CvOUTSIDE. */
555 oldsavestack_ix = start_subparse(FALSE,0);
556 cv = PL_compcv;
557 }
558 else {
559 /* Avoid calling newXS, as it calls us, and things start to
560 get hairy. */
561 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
562 GvCV_set(gv,cv);
563 GvCVGEN(gv) = 0;
0f8d4b5e
FC
564 CvISXSUB_on(cv);
565 CvXSUB(cv) = core_xsub;
eacbb379 566 PoisonPADLIST(cv);
0f8d4b5e
FC
567 }
568 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
569 from PL_curcop. */
9b669ea1
DD
570 /* XSUBs can't be perl lang/perl5db.pl debugged
571 if (PERLDB_LINE_OR_SAVESRC)
572 (void)gv_fetchfile(file); */
0f8d4b5e
FC
573 CvFILE(cv) = (char *)file;
574 /* XXX This is inefficient, as doing things this order causes
575 a prototype check in newATTRSUB. But we have to do
576 it this order as we need an op number before calling
577 new ATTRSUB. */
578 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 579 if (stash)
73c02f15 580 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 581 if (ampable) {
4428fb0e
TC
582#ifdef DEBUGGING
583 CV *orig_cv = cv;
584#endif
0f8d4b5e 585 CvLVALUE_on(cv);
4428fb0e
TC
586 /* newATTRSUB will free the CV and return NULL if we're still
587 compiling after a syntax error */
e8f91c91 588 if ((cv = newATTRSUB_x(
7e68c38b 589 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC
590 NULL,NULL,
591 coresub_op(
592 opnum
593 ? newSVuv((UV)opnum)
594 : newSVpvn(name,len),
595 code, opnum
7e68c38b 596 ),
e8f91c91 597 TRUE
4428fb0e
TC
598 )) != NULL) {
599 assert(GvCV(gv) == orig_cv);
600 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
cd642408 601 && opnum != OP_UNDEF && opnum != OP_KEYS)
4428fb0e
TC
602 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
603 }
0f8d4b5e
FC
604 LEAVE;
605 PL_parser = oldparser;
606 PL_curcop = oldcurcop;
607 PL_compcv = oldcompcv;
608 }
4428fb0e
TC
609 if (cv) {
610 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
611 cv_set_call_checker(
612 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
613 );
614 SvREFCNT_dec(opnumsv);
615 }
616
0f8d4b5e
FC
617 return gv;
618}
619
954c1994 620/*
6c53d59b
FC
621=for apidoc gv_fetchmeth
622
623Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
624
e6919483
BF
625=for apidoc gv_fetchmeth_sv
626
627Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
628of an SV instead of a string/length pair.
629
630=cut
631*/
632
633GV *
634Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
635{
c290e187 636 char *namepv;
637 STRLEN namelen;
638 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
639 if (LIKELY(SvPOK_nog(namesv))) /* common case */
640 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, flags);
641 namepv = SvPV(namesv, namelen);
642 if (SvUTF8(namesv)) flags |= SVf_UTF8;
643 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF
644}
645
646/*
647=for apidoc gv_fetchmeth_pv
648
649Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
650instead of a string/length pair.
651
652=cut
653*/
654
655GV *
656Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
657{
658 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 659 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF
660}
661
662/*
663=for apidoc gv_fetchmeth_pvn
954c1994
GS
664
665Returns the glob with the given C<name> and a defined subroutine or
666C<NULL>. The glob lives in the given C<stash>, or in the stashes
796b6530 667accessible via C<@ISA> and C<UNIVERSAL::>.
954c1994
GS
668
669The argument C<level> should be either 0 or -1. If C<level==0>, as a
670side-effect creates a glob with the given C<name> in the given C<stash>
671which in the case of success contains an alias for the subroutine, and sets
e1a479c5 672up caching info for this glob.
954c1994 673
796b6530 674The only significant values for C<flags> are C<GV_SUPER> and C<SVf_UTF8>.
aae43805 675
796b6530 676C<GV_SUPER> indicates that we want to look up the method in the superclasses
aae43805 677of the C<stash>.
e6919483 678
aae43805 679The
954c1994 680GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 681visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 682the GV directly; instead, you should use the method's CV, which can be
b267980d 683obtained from the GV with the C<GvCV> macro.
954c1994
GS
684
685=cut
686*/
687
e1a479c5
BB
688/* NOTE: No support for tied ISA */
689
c6afe666 690PERL_STATIC_INLINE GV*
691S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 692{
463ee0b2 693 GV** gvp;
c6afe666 694 HE* he;
e1a479c5
BB
695 AV* linear_av;
696 SV** linear_svp;
697 SV* linear_sv;
aae43805 698 HV* cstash, *cachestash;
e1a479c5
BB
699 GV* candidate = NULL;
700 CV* cand_cv = NULL;
e1a479c5 701 GV* topgv = NULL;
bfcb3514 702 const char *hvname;
c6afe666 703 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 704 I32 items;
e1a479c5 705 U32 topgen_cmp;
04f3bf56 706 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 707
af09ea45
IK
708 /* UNIVERSAL methods should be callable without a stash */
709 if (!stash) {
e1a479c5 710 create = 0; /* probably appropriate */
da51bb9b 711 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK
712 return 0;
713 }
714
e1a479c5
BB
715 assert(stash);
716
bfcb3514
NC
717 hvname = HvNAME_get(stash);
718 if (!hvname)
e1a479c5 719 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 720
e1a479c5 721 assert(hvname);
55df6700 722 assert(name || meth);
463ee0b2 723
aae43805 724 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC
725 flags & GV_SUPER ? "SUPER " : "",
726 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 727
dd69841b 728 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 729
aae43805 730 if (flags & GV_SUPER) {
1a33a059
FC
731 if (!HvAUX(stash)->xhv_mro_meta->super)
732 HvAUX(stash)->xhv_mro_meta->super = newHV();
733 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC
734 }
735 else cachestash = stash;
736
e1a479c5 737 /* check locally for a real method or a cache entry */
c6afe666 738 he = (HE*)hv_common(
739 cachestash, meth, name, len, (flags & SVf_UTF8) ? HVhek_UTF8 : 0, create, NULL, 0
740 );
741 if (he) gvp = (GV**)&HeVAL(he);
742 else gvp = NULL;
743
e1a479c5
BB
744 if(gvp) {
745 topgv = *gvp;
0f8d4b5e 746 have_gv:
e1a479c5
BB
747 assert(topgv);
748 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC
749 {
750 if (!name)
751 name = SvPV_nomg(meth, len);
04ec7e59 752 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 753 }
e1a479c5
BB
754 if ((cand_cv = GvCV(topgv))) {
755 /* If genuine method or valid cache entry, use it */
756 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
757 return topgv;
758 }
759 else {
760 /* stale cache entry, junk it and move on */
e7881358 761 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM
762 GvCV_set(topgv, NULL);
763 cand_cv = NULL;
e1a479c5
BB
764 GvCVGEN(topgv) = 0;
765 }
766 }
767 else if (GvCVGEN(topgv) == topgen_cmp) {
768 /* cache indicates no such method definitively */
769 return 0;
770 }
aae43805
FC
771 else if (stash == cachestash
772 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
4c4f3c46 773 && strEQs(hvname, "CORE")
87566176 774 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 775 goto have_gv;
463ee0b2 776 }
79072805 777
aae43805 778 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB
779 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
780 items = AvFILLp(linear_av); /* no +1, to skip over self */
781 while (items--) {
782 linear_sv = *linear_svp++;
783 assert(linear_sv);
784 cstash = gv_stashsv(linear_sv, 0);
785
dd69841b 786 if (!cstash) {
ecad31f0 787 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
147e3846 788 "Can't locate package %" SVf " for @%" HEKf "::ISA",
ecad31f0 789 SVfARG(linear_sv),
d0c0e7dd 790 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB
791 continue;
792 }
9607fc9c 793
e1a479c5
BB
794 assert(cstash);
795
c60dbbc3 796 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC
797 if (!gvp) {
798 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
799 const char *hvname = HvNAME(cstash); assert(hvname);
4c4f3c46 800 if (strEQs(hvname, "CORE")
0f8d4b5e 801 && (candidate =
87566176 802 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC
803 ))
804 goto have_candidate;
805 }
806 continue;
807 }
808 else candidate = *gvp;
809 have_candidate:
e1a479c5 810 assert(candidate);
04f3bf56 811 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 812 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
813 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
814 /*
815 * Found real method, cache method in topgv if:
816 * 1. topgv has no synonyms (else inheritance crosses wires)
817 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
818 */
819 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
820 CV *old_cv = GvCV(topgv);
821 SvREFCNT_dec(old_cv);
e1a479c5 822 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 823 GvCV_set(topgv, cand_cv);
e1a479c5
BB
824 GvCVGEN(topgv) = topgen_cmp;
825 }
826 return candidate;
827 }
828 }
9607fc9c 829
e1a479c5
BB
830 /* Check UNIVERSAL without caching */
831 if(level == 0 || level == -1) {
55df6700
FC
832 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
833 flags &~GV_SUPER);
e1a479c5
BB
834 if(candidate) {
835 cand_cv = GvCV(candidate);
836 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
837 CV *old_cv = GvCV(topgv);
838 SvREFCNT_dec(old_cv);
e1a479c5 839 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 840 GvCV_set(topgv, cand_cv);
e1a479c5
BB
841 GvCVGEN(topgv) = topgen_cmp;
842 }
843 return candidate;
844 }
845 }
846
847 if (topgv && GvREFCNT(topgv) == 1) {
848 /* cache the fact that the method is not defined */
849 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW
850 }
851
79072805
LW
852 return 0;
853}
854
c6afe666 855GV *
856Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
857{
858 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
859 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
860}
861
954c1994 862/*
460e5730
FC
863=for apidoc gv_fetchmeth_autoload
864
865This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
866parameter.
867
d21989ed 868=for apidoc gv_fetchmeth_sv_autoload
611c1e95 869
d21989ed
BF
870Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
871of an SV instead of a string/length pair.
872
873=cut
874*/
875
876GV *
877Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
878{
879 char *namepv;
880 STRLEN namelen;
881 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
882 namepv = SvPV(namesv, namelen);
883 if (SvUTF8(namesv))
884 flags |= SVf_UTF8;
885 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
886}
887
888/*
889=for apidoc gv_fetchmeth_pv_autoload
890
891Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
892instead of a string/length pair.
893
894=cut
895*/
896
897GV *
898Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
899{
900 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
901 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
902}
903
904/*
905=for apidoc gv_fetchmeth_pvn_autoload
906
796b6530 907Same as C<gv_fetchmeth_pvn()>, but looks for autoloaded subroutines too.
611c1e95
IZ
908Returns a glob for the subroutine.
909
910For an autoloaded subroutine without a GV, will create a GV even
796b6530 911if C<level < 0>. For an autoloaded subroutine without a stub, C<GvCV()>
611c1e95
IZ
912of the result may be zero.
913
796b6530 914Currently, the only significant value for C<flags> is C<SVf_UTF8>.
d21989ed 915
611c1e95
IZ
916=cut
917*/
918
919GV *
d21989ed 920Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 921{
499321d3 922 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 923
d21989ed 924 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 925
611c1e95 926 if (!gv) {
611c1e95
IZ
927 CV *cv;
928 GV **gvp;
929
930 if (!stash)
6136c704 931 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 932 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 933 return NULL;
d21989ed 934 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 935 return NULL;
611c1e95
IZ
936 cv = GvCV(gv);
937 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 938 return NULL;
611c1e95
IZ
939 /* Have an autoload */
940 if (level < 0) /* Cannot do without a stub */
d21989ed 941 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF
942 gvp = (GV**)hv_fetch(stash, name,
943 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 944 if (!gvp)
6136c704 945 return NULL;
611c1e95
IZ
946 return *gvp;
947 }
948 return gv;
949}
950
951/*
954c1994
GS
952=for apidoc gv_fetchmethod_autoload
953
954Returns the glob which contains the subroutine to call to invoke the method
955on the C<stash>. In fact in the presence of autoloading this may be the
796b6530 956glob for "AUTOLOAD". In this case the corresponding variable C<$AUTOLOAD> is
b267980d 957already setup.
954c1994
GS
958
959The third parameter of C<gv_fetchmethod_autoload> determines whether
960AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 961means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 962Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 963with a non-zero C<autoload> parameter.
954c1994 964
cec2d7b1
FC
965These functions grant C<"SUPER"> token
966as a prefix of the method name. Note
954c1994
GS
967that if you want to keep the returned glob for a long time, you need to
968check for it being "AUTOLOAD", since at the later time the call may load a
796b6530 969different subroutine due to C<$AUTOLOAD> changing its value. Use the glob
cec2d7b1 970created as a side effect to do this.
954c1994 971
cec2d7b1
FC
972These functions have the same side-effects as C<gv_fetchmeth> with
973C<level==0>. The warning against passing the GV returned by
974C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS
975
976=cut
977*/
978
dc848c6f 979GV *
864dbfa3 980Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 981{
547bb267
NC
982 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
983
256d1bb2
NC
984 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
985}
986
44130a26
BF
987GV *
988Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
989{
990 char *namepv;
991 STRLEN namelen;
992 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
993 namepv = SvPV(namesv, namelen);
994 if (SvUTF8(namesv))
995 flags |= SVf_UTF8;
996 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
997}
998
999GV *
1000Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1001{
1002 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1003 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1004}
1005
256d1bb2 1006GV *
44130a26 1007Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1008{
65308f87
YO
1009 const char * const origname = name;
1010 const char * const name_end = name + len;
e2cace1e 1011 const char *last_separator = NULL;
a0d0e21e 1012 GV* gv;
0dae17bd 1013 HV* ostash = stash;
ad64d0ec 1014 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
1015 const U32 autoload = flags & GV_AUTOLOAD;
1016 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1017 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1018
44130a26 1019 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1020
eff494dd 1021 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1022 stash = NULL;
c9bf4021 1023 else {
e2cace1e 1024 /* The only way stash can become NULL later on is if last_separator is set,
c9bf4021
NC
1025 which in turn means that there is no need for a SVt_PVHV case
1026 the error reporting code. */
1027 }
b267980d 1028
cfb73676
YO
1029 {
1030 /* check if the method name is fully qualified or
1031 * not, and separate the package name from the actual
1032 * method name.
1033 *
1034 * leaves last_separator pointing to the beginning of the
1035 * last package separator (either ' or ::) or 0
1036 * if none was found.
1037 *
1038 * leaves name pointing at the beginning of the
1039 * method name.
1040 */
1041 const char *name_cursor = name;
1042 const char * const name_em1 = name_end - 1; /* name_end minus 1 */
1043 for (name_cursor = name; name_cursor < name_end ; name_cursor++) {
1044 if (*name_cursor == '\'') {
1045 last_separator = name_cursor;
1046 name = name_cursor + 1;
1047 }
1048 else if (name_cursor < name_em1 && *name_cursor == ':' && name_cursor[1] == ':') {
1049 last_separator = name_cursor++;
1050 name = name_cursor + 1;
1051 }
1052 }
a0d0e21e 1053 }
cfb73676
YO
1054
1055 /* did we find a separator? */
e2cace1e 1056 if (last_separator) {
9b7f107c
YO
1057 STRLEN sep_len= last_separator - origname;
1058 if ( memEQs(origname, sep_len, "SUPER")) {
9607fc9c 1059 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC
1060 stash = CopSTASH(PL_curcop);
1061 flags |= GV_SUPER;
cea2e8a9 1062 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1063 origname, HvENAME_get(stash), name) );
4633a7c4 1064 }
9b7f107c
YO
1065 else if ( sep_len >= 7 &&
1066 strEQs(last_separator - 7, "::SUPER")) {
aae43805 1067 /* don't autovifify if ->NoSuchStash::SUPER::method */
9b7f107c 1068 stash = gv_stashpvn(origname, sep_len - 7, is_utf8);
aae43805
FC
1069 if (stash) flags |= GV_SUPER;
1070 }
e189a56d 1071 else {
af09ea45 1072 /* don't autovifify if ->NoSuchStash::method */
9b7f107c 1073 stash = gv_stashpvn(origname, sep_len, is_utf8);
e189a56d 1074 }
0dae17bd 1075 ostash = stash;
4633a7c4
LW
1076 }
1077
65308f87 1078 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags);
a0d0e21e 1079 if (!gv) {
7da9d78d
AB
1080 /* This is the special case that exempts Foo->import and
1081 Foo->unimport from being an error even if there's no
1082 import/unimport subroutine */
2f6e0fe7 1083 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1084 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1085 else if (autoload)
c8416c26 1086 gv = gv_autoload_pvn(
65308f87 1087 ostash, name, name_end - name, GV_AUTOLOAD_ISMETHOD|flags
c8416c26 1088 );
256d1bb2
NC
1089 if (!gv && do_croak) {
1090 /* Right now this is exclusively for the benefit of S_method_common
1091 in pp_hot.c */
1092 if (stash) {
15e6cdd9
DG
1093 /* If we can't find an IO::File method, it might be a call on
1094 * a filehandle. If IO:File has not been loaded, try to
1095 * require it first instead of croaking */
1096 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1097 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1098 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1099 STR_WITH_LEN("IO/File.pm"), 0,
1100 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1101 ) {
31b05a0f 1102 require_pv("IO/File.pm");
65308f87 1103 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags);
15e6cdd9
DG
1104 if (gv)
1105 return gv;
1106 }
256d1bb2 1107 Perl_croak(aTHX_
147e3846
KW
1108 "Can't locate object method \"%" UTF8f
1109 "\" via package \"%" HEKf "\"",
65308f87 1110 UTF8fARG(is_utf8, name_end - name, name),
d0c0e7dd 1111 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC
1112 }
1113 else {
ecad31f0 1114 SV* packnamesv;
256d1bb2 1115
e2cace1e
YO
1116 if (last_separator) {
1117 packnamesv = newSVpvn_flags(origname, last_separator - origname,
ecad31f0 1118 SVs_TEMP | is_utf8);
256d1bb2 1119 } else {
017c5e4e 1120 packnamesv = error_report;
256d1bb2
NC
1121 }
1122
1123 Perl_croak(aTHX_
147e3846
KW
1124 "Can't locate object method \"%" UTF8f
1125 "\" via package \"%" SVf "\""
1126 " (perhaps you forgot to load \"%" SVf "\"?)",
65308f87 1127 UTF8fARG(is_utf8, name_end - name, name),
ecad31f0 1128 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1129 }
1130 }
463ee0b2 1131 }
dc848c6f 1132 else if (autoload) {
9d4ba2ae 1133 CV* const cv = GvCV(gv);
09280a33
CS
1134 if (!CvROOT(cv) && !CvXSUB(cv)) {
1135 GV* stubgv;
1136 GV* autogv;
1137
0c028dca 1138 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS
1139 stubgv = gv;
1140 else {
1141 stubgv = CvGV(cv);
1142 if (GvCV(stubgv) != cv) /* orphaned import */
1143 stubgv = gv;
1144 }
c8416c26
BF
1145 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1146 GvNAME(stubgv), GvNAMELEN(stubgv),
1147 GV_AUTOLOAD_ISMETHOD
1148 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1149 if (autogv)
1150 gv = autogv;
1151 }
1152 }
44a8e56a
PP
1153
1154 return gv;
1155}
1156
1157GV*
0eeb01b9 1158Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1159{
1160 char *namepv;
1161 STRLEN namelen;
0fe84f7c 1162 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1163 namepv = SvPV(namesv, namelen);
1164 if (SvUTF8(namesv))
1165 flags |= SVf_UTF8;
0eeb01b9 1166 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1167}
1168
1169GV*
0eeb01b9 1170Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1171{
0fe84f7c 1172 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1173 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1174}
1175
1176GV*
0eeb01b9 1177Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1178{
44a8e56a
PP
1179 GV* gv;
1180 CV* cv;
1181 HV* varstash;
1182 GV* vargv;
1183 SV* varsv;
c8416c26
BF
1184 SV *packname = NULL;
1185 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1186
0fe84f7c 1187 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1188
7edbdc6b 1189 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1190 return NULL;
0dae17bd
GS
1191 if (stash) {
1192 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1193 STRLEN packname_len = 0;
1194 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1195 packname = newSVpvn_flags(packname_ptr, packname_len,
1196 SVs_TEMP | SvUTF8(stash));
5c284bb0 1197 stash = NULL;
0dae17bd 1198 }
c8416c26
BF
1199 else
1200 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1201 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1202 }
257dc59d
FC
1203 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1204 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1205 return NULL;
dc848c6f
PP
1206 cv = GvCV(gv);
1207
adb5a9ae 1208 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1209 return NULL;
ed850460 1210
dc848c6f
PP
1211 /*
1212 * Inheriting AUTOLOAD for non-methods works ... for now.
1213 */
0eeb01b9
FC
1214 if (
1215 !(flags & GV_AUTOLOAD_ISMETHOD)
1216 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1217 )
d1d15184 1218 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
147e3846 1219 "Use of inherited AUTOLOAD for non-method %" SVf
d9d53e86
A
1220 "::%" UTF8f "() is deprecated. This will be "
1221 "fatal in Perl 5.28",
ecad31f0 1222 SVfARG(packname),
b17a0679 1223 UTF8fARG(is_utf8, len, name));
44a8e56a 1224
aed2304a 1225 if (CvISXSUB(cv)) {
bb619f37
FC
1226 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1227 * and split that value on the last '::', pass along the same data
1228 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC
1229 *
1230 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1231 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC
1232 * type. Since SvPVX has been documented as returning the sub name
1233 * for a long time, but not as returning the prototype, we have
1234 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1235 * elsewhere.
1236 *
1237 * We put the prototype in the same allocated buffer, but after
1238 * the sub name. The SvPOK flag indicates the presence of a proto-
1239 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1240 * If both flags are on, then SvLEN is used to indicate the end of
1241 * the prototype (artificially lower than what is actually allo-
1242 * cated), at the risk of having to reallocate a few bytes unneces-
1243 * sarily--but that should happen very rarely, if ever.
1244 *
1245 * We use SvUTF8 for both prototypes and sub names, so if one is
1246 * UTF8, the other must be upgraded.
adb5a9ae 1247 */
c68d9564 1248 CvSTASH_set(cv, stash);
8fa6a409 1249 if (SvPOK(cv)) { /* Ouch! */
e7881358 1250 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC
1251 STRLEN ulen;
1252 const char *proto = CvPROTO(cv);
1253 assert(proto);
1254 if (SvUTF8(cv))
1255 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1256 ulen = SvCUR(tmpsv);
1257 SvCUR(tmpsv)++; /* include null in string */
1258 sv_catpvn_flags(
1259 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1260 );
1261 SvTEMP_on(tmpsv); /* Allow theft */
1262 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1263 SvTEMP_off(tmpsv);
e7881358 1264 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC
1265 SvLEN(cv) = SvCUR(cv) + 1;
1266 SvCUR(cv) = ulen;
1267 }
1268 else {
1269 sv_setpvn((SV *)cv, name, len);
1270 SvPOK_off(cv);
1271 if (is_utf8)
c8416c26 1272 SvUTF8_on(cv);
8fa6a409
FC
1273 else SvUTF8_off(cv);
1274 }
1275 CvAUTOLOAD_on(cv);
adb5a9ae 1276 }
adb5a9ae 1277
44a8e56a
PP
1278 /*
1279 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1280 * The subroutine's original name may not be "AUTOLOAD", so we don't
1281 * use that, but for lack of anything better we will use the sub's
1282 * original package to look up $AUTOLOAD.
1283 */
18691622 1284 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1285 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1286 ENTER;
1287
c69033f2 1288 if (!isGV(vargv)) {
04ec7e59 1289 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1290#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1291 GvSV(vargv) = newSV(0);
c69033f2
NC
1292#endif
1293 }
3d35f11b 1294 LEAVE;
e203899d 1295 varsv = GvSVn(vargv);
4bac9ae4
CS
1296 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1297 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1298 sv_setsv(varsv, packname);
396482e1 1299 sv_catpvs(varsv, "::");
d40bf27b
NC
1300 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1301 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC
1302 sv_catpvn_flags(
1303 varsv, name, len,
5bcd1ef4 1304 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1305 );
c8416c26
BF
1306 if (is_utf8)
1307 SvUTF8_on(varsv);
a0d0e21e
LW
1308 return gv;
1309}
1310
44a2ac75
YO
1311
1312/* require_tie_mod() internal routine for requiring a module
486ec47a 1313 * that implements the logic of automatic ties like %! and %-
e94ea821
FC
1314 * It loads the module and then calls the _tie_it subroutine
1315 * with the passed gv as an argument.
44a2ac75
YO
1316 *
1317 * The "gv" parameter should be the glob.
ee33cc1a 1318 * "varname" holds the 1-char name of the var, used for error messages.
45cbc99a 1319 * "namesv" holds the module name. Its refcount will be decremented.
45cbc99a 1320 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1321 * For the protection of $! to work (it is set by this routine)
1322 * the sv slot must already be magicalized.
d2c93421 1323 */
e94ea821 1324STATIC void
ee33cc1a 1325S_require_tie_mod(pTHX_ GV *gv, const char varname, const char * name,
a1683482 1326 STRLEN len, const U32 flags)
d2c93421 1327{
e94ea821 1328 const SV * const target = varname == '[' ? GvSV(gv) : (SV *)GvHV(gv);
45cbc99a 1329
7918f24d
NC
1330 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1331
e94ea821
FC
1332 /* If it is not tied */
1333 if (!target || !SvRMAGICAL(target)
1334 || !mg_find(target,
1335 varname == '[' ? PERL_MAGIC_tiedscalar : PERL_MAGIC_tied))
1336 {
1337 HV *stash;
1338 GV **gvp;
1339 dSP;
1340
1341 ENTER;
e94ea821 1342
4c4f3c46 1343#define HV_FETCH_TIE_FUNC (GV **)hv_fetchs(stash, "_tie_it", 0)
e94ea821
FC
1344
1345 /* Load the module if it is not loaded. */
360cebfd 1346 if (!(stash = gv_stashpvn(name, len, 0))
e94ea821
FC
1347 || !(gvp = HV_FETCH_TIE_FUNC) || !*gvp || !GvCV(*gvp))
1348 {
360cebfd 1349 SV * const module = newSVpvn(name, len);
b82b06b8 1350 const char type = varname == '[' ? '$' : '%';
44a2ac75 1351 if ( flags & 1 )
45cbc99a 1352 save_scalar(gv);
5b2ef88e 1353 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1354 assert(sp == PL_stack_sp);
360cebfd 1355 stash = gv_stashpvn(name, len, 0);
44a2ac75 1356 if (!stash)
360cebfd
FC
1357 Perl_croak(aTHX_ "panic: Can't use %c%c because %s is not available",
1358 type, varname, name);
e94ea821 1359 else if (!(gvp = HV_FETCH_TIE_FUNC) || !*gvp || !GvCV(*gvp))
360cebfd
FC
1360 Perl_croak(aTHX_ "panic: Can't use %c%c because %s does not define _tie_it",
1361 type, varname, name);
e94ea821
FC
1362 }
1363 /* Now call the tie function. It should be in *gvp. */
1364 assert(gvp); assert(*gvp); assert(GvCV(*gvp));
1365 PUSHMARK(SP);
1366 XPUSHs((SV *)gv);
1367 PUTBACK;
1368 call_sv((SV *)*gvp, G_VOID|G_DISCARD);
1369 LEAVE;
d2c93421
RH
1370 }
1371}
1372
7c719134
YO
1373/* add a require_tie_mod_s - the _s suffix is similar to pvs type suffixes,
1374 * IOW it means we do STR_WITH_LEN() ourselves and the user should pass in
1375 * a true string WITHOUT a len.
1376 */
1377#define require_tie_mod_s(gv, varname, name, flags) \
1378 S_require_tie_mod(aTHX_ gv, varname, STR_WITH_LEN(name), flags)
1379
954c1994
GS
1380/*
1381=for apidoc gv_stashpv
1382
da51bb9b 1383Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1384determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1385
1386=cut
1387*/
1388
a0d0e21e 1389HV*
864dbfa3 1390Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1391{
7918f24d 1392 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1393 return gv_stashpvn(name, strlen(name), create);
1394}
1395
bc96cb06
SH
1396/*
1397=for apidoc gv_stashpvn
1398
da51bb9b
NC
1399Returns a pointer to the stash for a specified package. The C<namelen>
1400parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1401to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1402created if it does not already exist. If the package does not exist and
796b6530 1403C<flags> is 0 (or any other setting that does not create packages) then C<NULL>
da51bb9b
NC
1404is returned.
1405
566a4718
YO
1406Flags may be one of:
1407
1408 GV_ADD
1409 SVf_UTF8
1410 GV_NOADD_NOINIT
1411 GV_NOINIT
1412 GV_NOEXPAND
1413 GV_ADDMG
1414
796b6530 1415The most important of which are probably C<GV_ADD> and C<SVf_UTF8>.
bc96cb06 1416
808724c8 1417Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1418recommended for performance reasons.
1419
bc96cb06
SH
1420=cut
1421*/
1422
0eadbdad
YO
1423/*
1424gv_stashpvn_internal
1425
1426Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1427as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1428
1429*/
1430
4e7ebec5 1431PERL_STATIC_INLINE HV*
0eadbdad 1432S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1433{
0cea0058 1434 char smallbuf[128];
46fc3d4c 1435 char *tmpbuf;
a0d0e21e
LW
1436 HV *stash;
1437 GV *tmpgv;
add0ecde 1438 U32 tmplen = namelen + 2;
dc437b57 1439
0eadbdad 1440 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1441
add0ecde 1442 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1443 tmpbuf = smallbuf;
1444 else
add0ecde
VP
1445 Newx(tmpbuf, tmplen, char);
1446 Copy(name, tmpbuf, namelen, char);
1447 tmpbuf[namelen] = ':';
1448 tmpbuf[namelen+1] = ':';
1449 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1450 if (tmpbuf != smallbuf)
1451 Safefree(tmpbuf);
d2fcb1d6 1452 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1453 return NULL;
a0d0e21e 1454 stash = GvHV(tmpgv);
1f656fcf 1455 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1456 assert(stash);
1f656fcf 1457 if (!HvNAME_get(stash)) {
0be4d16f 1458 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1459
1460 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1461 /* If the containing stash has multiple effective
1462 names, see that this one gets them, too. */
1463 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1464 mro_package_moved(stash, NULL, tmpgv, 1);
1465 }
a0d0e21e 1466 return stash;
463ee0b2
LW
1467}
1468
808724c8 1469/*
1470gv_stashsvpvn_cached
1471
1472Returns a pointer to the stash for a specified package, possibly
48a81373 1473cached. Implements both C<gv_stashpvn> and C<gv_stashsv>.
808724c8 1474
1475Requires one of either namesv or namepv to be non-null.
1476
fbe13c60 1477See C<L</gv_stashpvn>> for details on "flags".
808724c8 1478
1479Note the sv interface is strongly preferred for performance reasons.
1480
1481*/
1482
1483#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1484 assert(namesv || name)
1485
1486PERL_STATIC_INLINE HV*
1487S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1488{
1489 HV* stash;
808724c8 1490 HE* he;
1491
1492 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1493
1494 he = (HE *)hv_common(
1495 PL_stashcache, namesv, name, namelen,
4e7ebec5 1496 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1497 );
808724c8 1498
4e7ebec5 1499 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1500 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1501
808724c8 1502 if (namesv) {
1503 if (SvOK(namesv)) { /* prevent double uninit warning */
1504 STRLEN len;
1505 name = SvPV_const(namesv, len);
1506 namelen = len;
1507 flags |= SvUTF8(namesv);
1508 } else {
1509 name = ""; namelen = 0;
1510 }
1511 }
0eadbdad
YO
1512 stash = gv_stashpvn_internal(name, namelen, flags);
1513
4e7ebec5 1514 if (stash && namelen) {
1515 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1516 (void)hv_store(PL_stashcache, name,
4e7ebec5 1517 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1518 }
808724c8 1519
4e7ebec5 1520 return stash;
1521}
1522
808724c8 1523HV*
1524Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1525{
1526 PERL_ARGS_ASSERT_GV_STASHPVN;
1527 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1528}
1529
954c1994
GS
1530/*
1531=for apidoc gv_stashsv
1532
fbe13c60
KW
1533Returns a pointer to the stash for a specified package. See
1534C<L</gv_stashpvn>>.
954c1994 1535
fbe13c60
KW
1536Note this interface is strongly preferred over C<gv_stashpvn> for performance
1537reasons.
808724c8 1538
954c1994
GS
1539=cut
1540*/
1541
a0d0e21e 1542HV*
da51bb9b 1543Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1544{
7918f24d 1545 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1546 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW
1547}
1548
1549
463ee0b2 1550GV *
fe9845cc 1551Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1552 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1553 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1554}
1555
1556GV *
fe9845cc 1557Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1558 STRLEN len;
77cb3b01
FC
1559 const char * const nambeg =
1560 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1561 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1562 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1563}
1564
90aeefb4 1565PERL_STATIC_INLINE void
290a1700 1566S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1567{
1568 AV* av;
1569
1570 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1571
1572 av = GvAVn(gv);
1573 GvMULTI_on(gv);
1574 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1575 NULL, 0);
ad7cce9f
FR
1576}
1577
90aeefb4
BF
1578/* This function grabs name and tries to split a stash and glob
1579 * from its contents. TODO better description, comments
1580 *
1581 * If the function returns TRUE and 'name == name_end', then
1582 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1583 */
1584PERL_STATIC_INLINE bool
1585S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1586 STRLEN *len, const char *nambeg, STRLEN full_len,
1587 const U32 is_utf8, const I32 add)
1588{
1589 const char *name_cursor;
1590 const char *const name_end = nambeg + full_len;
1591 const char *const name_em1 = name_end - 1;
1592
1593 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1594
7a207065
KW
1595 if ( full_len > 2
1596 && **name == '*'
1597 && isIDFIRST_lazy_if_safe(*name + 1, name_end, is_utf8))
1598 {
90aeefb4
BF
1599 /* accidental stringify on a GV? */
1600 (*name)++;
1601 }
1602
1603 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1604 if (name_cursor < name_em1 &&
1605 ((*name_cursor == ':' && name_cursor[1] == ':')
1606 || *name_cursor == '\''))
1607 {
1608 if (!*stash)
1609 *stash = PL_defstash;
1610 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1611 return FALSE;
1612
1613 *len = name_cursor - *name;
1614 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1615 const char *key;
1616 GV**gvp;
1617 if (*name_cursor == ':') {
1618 key = *name;
1619 *len += 2;
1620 }
1621 else {
1622 char *tmpbuf;
1623 Newx(tmpbuf, *len+2, char);
1624 Copy(*name, tmpbuf, *len, char);
1625 tmpbuf[(*len)++] = ':';
1626 tmpbuf[(*len)++] = ':';
1627 key = tmpbuf;
1628 }
c161da64 1629 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF
1630 *gv = gvp ? *gvp : NULL;
1631 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1632 if (SvTYPE(*gv) != SVt_PVGV)
1633 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1634 else
1635 GvMULTI_on(*gv);
1636 }
1637 if (key != *name)
1638 Safefree(key);
1639 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1640 return FALSE;
1641
1642 if (!(*stash = GvHV(*gv))) {
1643 *stash = GvHV(*gv) = newHV();
1644 if (!HvNAME_get(*stash)) {
1645 if (GvSTASH(*gv) == PL_defstash && *len == 6
4c4f3c46
YO
1646 && strEQs(*name, "CORE"))
1647 hv_name_sets(*stash, "CORE", 0);
90aeefb4
BF
1648 else
1649 hv_name_set(
1650 *stash, nambeg, name_cursor-nambeg, is_utf8
1651 );
1652 /* If the containing stash has multiple effective
1653 names, see that this one gets them, too. */
1654 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1655 mro_package_moved(*stash, NULL, *gv, 1);
1656 }
1657 }
1658 else if (!HvNAME_get(*stash))
1659 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1660 }
1661
1662 if (*name_cursor == ':')
1663 name_cursor++;
1664 *name = name_cursor+1;
1665 if (*name == name_end) {
120921ac
Z
1666 if (!*gv) {
1667 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1668 if (SvTYPE(*gv) != SVt_PVGV) {
1669 gv_init_pvn(*gv, PL_defstash, "main::", 6,
1670 GV_ADDMULTI);
1671 GvHV(*gv) =
1672 MUTABLE_HV(SvREFCNT_inc_simple(PL_defstash));
1673 }
1674 }
90aeefb4
BF
1675 return TRUE;
1676 }
1677 }
1678 }
1679 *len = name_cursor - *name;
1680 return TRUE;
1681}
1682
536d1a88 1683/* Checks if an unqualified name is in the main stash */
90aeefb4 1684PERL_STATIC_INLINE bool
536d1a88 1685S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1686{
536d1a88 1687 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1688
90aeefb4 1689 /* If it's an alphanumeric variable */
7a207065 1690 if ( len && isIDFIRST_lazy_if_safe(name, name + len, is_utf8) ) {
90aeefb4
BF
1691 /* Some "normal" variables are always in main::,
1692 * like INC or STDOUT.
1693 */
1694 switch (len) {
1695 case 1:
1696 if (*name == '_')
536d1a88 1697 return TRUE;
90aeefb4
BF
1698 break;
1699 case 3:
1700 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1701 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1702 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1703 return TRUE;
90aeefb4
BF
1704 break;
1705 case 4:
1706 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1707 && name[3] == 'V')
536d1a88 1708 return TRUE;
90aeefb4
BF
1709 break;
1710 case 5:
1711 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1712 && name[3] == 'I' && name[4] == 'N')
536d1a88 1713 return TRUE;
90aeefb4
BF
1714 break;
1715 case 6:
1716 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1717 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1718 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1719 return TRUE;
90aeefb4
BF
1720 break;
1721 case 7:
1722 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1723 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1724 && name[6] == 'T')
536d1a88 1725 return TRUE;
90aeefb4
BF
1726 break;
1727 }
536d1a88
BF
1728 }
1729 /* *{""}, or a special variable like $@ */
1730 else
1731 return TRUE;
1732
1733 return FALSE;
1734}
1735
1736
1737/* This function is called if parse_gv_stash_name() failed to
1738 * find a stash, or if GV_NOTQUAL or an empty name was passed
1739 * to gv_fetchpvn_flags.
1740 *
1741 * It returns FALSE if the default stash can't be found nor created,
1742 * which might happen during global destruction.
1743 */
1744PERL_STATIC_INLINE bool
1745S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1746 const U32 is_utf8, const I32 add,
1747 const svtype sv_type)
1748{
1749 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1750
1751 /* No stash in name, so see how we can default */
90aeefb4 1752
536d1a88
BF
1753 if ( gv_is_in_main(name, len, is_utf8) ) {
1754 *stash = PL_defstash;
1755 }
1756 else {
1757 if (IN_PERL_COMPILETIME) {
90aeefb4
BF
1758 *stash = PL_curstash;
1759 if (add && (PL_hints & HINT_STRICT_VARS) &&
1760 sv_type != SVt_PVCV &&
1761 sv_type != SVt_PVGV &&
1762 sv_type != SVt_PVFM &&
1763 sv_type != SVt_PVIO &&
1764 !(len == 1 && sv_type == SVt_PV &&
1765 (*name == 'a' || *name == 'b')) )
1766 {
c161da64 1767 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF
1768 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1769 SvTYPE(*gvp) != SVt_PVGV)
1770 {
1771 *stash = NULL;
1772 }
1773 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1774 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1775 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1776 {
1777 /* diag_listed_as: Variable "%s" is not imported%s */
1778 Perl_ck_warner_d(
1779 aTHX_ packWARN(WARN_MISC),
147e3846 1780 "Variable \"%c%" UTF8f "\" is not imported",
90aeefb4
BF
1781 sv_type == SVt_PVAV ? '@' :
1782 sv_type == SVt_PVHV ? '%' : '$',
1783 UTF8fARG(is_utf8, len, name));
1784 if (GvCVu(*gvp))
1785 Perl_ck_warner_d(
1786 aTHX_ packWARN(WARN_MISC),
147e3846 1787 "\t(Did you mean &%" UTF8f " instead?)\n",
90aeefb4
BF
1788 UTF8fARG(is_utf8, len, name)
1789 );
1790 *stash = NULL;
1791 }
1792 }
1793 }
1794 else {
1795 /* Use the current op's stash */
1796 *stash = CopSTASH(PL_curcop);
1797 }
1798 }
90aeefb4
BF
1799
1800 if (!*stash) {
1801 if (add && !PL_in_clean_all) {
10860bf4
FC
1802 GV *gv;
1803 qerror(Perl_mess(aTHX_
147e3846 1804 "Global symbol \"%s%" UTF8f
d8c6310a 1805 "\" requires explicit package name (did you forget to "
147e3846 1806 "declare \"my %s%" UTF8f "\"?)",
d8c6310a
FC
1807 (sv_type == SVt_PV ? "$"
1808 : sv_type == SVt_PVAV ? "@"
1809 : sv_type == SVt_PVHV ? "%"
1810 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF
1811 (sv_type == SVt_PV ? "$"
1812 : sv_type == SVt_PVAV ? "@"
1813 : sv_type == SVt_PVHV ? "%"
10860bf4 1814 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF
1815 /* To maintain the output of errors after the strict exception
1816 * above, and to keep compat with older releases, rather than
1817 * placing the variables in the pad, we place
1818 * them in the <none>:: stash.
1819 */
90aeefb4
BF
1820 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1821 if (!gv) {
1822 /* symbol table under destruction */
1823 return FALSE;
1824 }
1825 *stash = GvHV(gv);
1826 }
1827 else
1828 return FALSE;
1829 }
1830
1831 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1832 return FALSE;
1833
1834 return TRUE;
1835}
1836
8c995aba
FC
1837/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1838 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1839 this file. */
1840#undef SvREADONLY_on
1841#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1842
930867a8
BF
1843/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1844 * a new GV.
1845 * Note that it does not insert the GV into the stash prior to
1846 * magicalization, which some variables require need in order
1847 * to work (like $[, %+, %-, %!), so callers must take care of
1321bbe3 1848 * that.
930867a8 1849 *
1321bbe3
FC
1850 * It returns true if the gv did turn out to be magical one; i.e.,
1851 * if gv_magicalize actually did something.
930867a8
BF
1852 */
1853PERL_STATIC_INLINE bool
1854S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
1321bbe3 1855 const svtype sv_type)
79072805 1856{
960b831f 1857 SSize_t paren;
79072805 1858
930867a8 1859 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1860
44428a46 1861 if (stash != PL_defstash) { /* not the main stash */
ea238638 1862 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC
1863 and VERSION. All the others apply only to the main stash or to
1864 CORE (which is checked right after this). */
ea238638 1865 if (len) {
cc4c2da6 1866 switch (*name) {
cc4c2da6 1867 case 'E':
3092ee0c
YO
1868 if (
1869 len >= 6 && name[1] == 'X' &&
1870 (memEQs(name, len, "EXPORT")
eafd371c
YO
1871 ||memEQs(name, len, "EXPORT_OK")
1872 ||memEQs(name, len, "EXPORT_FAIL")
3092ee0c 1873 ||memEQs(name, len, "EXPORT_TAGS"))
eafd371c 1874 )
cc4c2da6
NC
1875 GvMULTI_on(gv);
1876 break;
1877 case 'I':
eafd371c 1878 if (memEQs(name, len, "ISA"))
290a1700 1879 gv_magicalize_isa(gv);
cc4c2da6 1880 break;
44428a46 1881 case 'V':
eafd371c 1882 if (memEQs(name, len, "VERSION"))
44428a46
FC
1883 GvMULTI_on(gv);
1884 break;
ea238638 1885 case 'a':
eafd371c 1886 if (stash == PL_debstash && memEQs(name, len, "args")) {
7bb33634
FC
1887 GvMULTI_on(gv_AVadd(gv));
1888 break;
eafd371c
YO
1889 }
1890 /* FALLTHROUGH */
ea238638
FC
1891 case 'b':
1892 if (len == 1 && sv_type == SVt_PV)
1893 GvMULTI_on(gv);
924ba076 1894 /* FALLTHROUGH */
4aaa4757
FC
1895 default:
1896 goto try_core;
1897 }
1321bbe3 1898 goto ret;
4aaa4757
FC
1899 }
1900 try_core:
1901 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1902 /* Avoid null warning: */
1903 const char * const stashname = HvNAME(stash); assert(stashname);
4c4f3c46 1904 if (strEQs(stashname, "CORE"))
87566176 1905 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC
1906 }
1907 }
1908 else if (len > 1) {
1909#ifndef EBCDIC
1910 if (*name > 'V' ) {
1911 NOOP;
1912 /* Nothing else to do.
1913 The compiler will probably turn the switch statement into a
1914 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW
1915 the common case of lower case variable names. (On EBCDIC
1916 platforms, we can't just do:
1917 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1918 because cases like '\027' in the switch statement below are
1919 C1 (non-ASCII) controls on those platforms, so the remapping
1920 would make them larger than 'V')
1921 */
44428a46
FC
1922 } else
1923#endif
1924 {
44428a46
FC
1925 switch (*name) {
1926 case 'A':
eafd371c 1927 if (memEQs(name, len, "ARGV")) {
44428a46
FC
1928 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1929 }
eafd371c 1930 else if (memEQs(name, len, "ARGVOUT")) {
44428a46
FC
1931 GvMULTI_on(gv);
1932 }
1933 break;
1934 case 'E':
3092ee0c
YO
1935 if (
1936 len >= 6 && name[1] == 'X' &&
1937 (memEQs(name, len, "EXPORT")
055ae706
YO
1938 ||memEQs(name, len, "EXPORT_OK")
1939 ||memEQs(name, len, "EXPORT_FAIL")
3092ee0c 1940 ||memEQs(name, len, "EXPORT_TAGS"))
055ae706 1941 )
44428a46
FC
1942 GvMULTI_on(gv);
1943 break;
1944 case 'I':
eafd371c 1945 if (memEQs(name, len, "ISA")) {
290a1700 1946 gv_magicalize_isa(gv);
44428a46
FC
1947 }
1948 break;
cc4c2da6 1949 case 'S':
eafd371c 1950 if (memEQs(name, len, "SIG")) {
cc4c2da6
NC
1951 HV *hv;
1952 I32 i;
d525a7b2
NC
1953 if (!PL_psig_name) {
1954 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1955 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1956 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1957 } else {
1958 /* I think that the only way to get here is to re-use an
1959 embedded perl interpreter, where the previous
1960 use didn't clean up fully because
1961 PL_perl_destruct_level was 0. I'm not sure that we
1962 "support" that, in that I suspect in that scenario
1963 there are sufficient other garbage values left in the
1964 interpreter structure that something else will crash
1965 before we get here. I suspect that this is one of
1966 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1967 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1968 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
1969 }
1970 GvMULTI_on(gv);
1971 hv = GvHVn(gv);
a0714e2c 1972 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1973 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1974 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
1975 if (init)
1976 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
1977 }
1978 }
1979 break;
1980 case 'V':
eafd371c 1981 if (memEQs(name, len, "VERSION"))
cc4c2da6
NC
1982 GvMULTI_on(gv);
1983 break;
e5218da5 1984 case '\003': /* $^CHILD_ERROR_NATIVE */
eafd371c 1985 if (memEQs(name, len, "\003HILD_ERROR_NATIVE"))
e5218da5 1986 goto magicalize;
27deb0cf
YO
1987 /* @{^CAPTURE} %{^CAPTURE} */
1988 if (memEQs(name, len, "\003APTURE")) {
1989 AV* const av = GvAVn(gv);
1990 UV uv= *name;
1991
1992 sv_magic(MUTABLE_SV(av), (SV*)uv, PERL_MAGIC_regdata, NULL, 0);
1993 SvREADONLY_on(av);
1994
1995 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1996 require_tie_mod_s(gv, '-', "Tie::Hash::NamedCapture",0);
1997
1998 } else /* %{^CAPTURE_ALL} */
1999 if (memEQs(name, len, "\003APTURE_ALL")) {
2000 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
2001 require_tie_mod_s(gv, '+', "Tie::Hash::NamedCapture",0);
2002 }
e5218da5 2003 break;
cc4c2da6 2004 case '\005': /* $^ENCODING */
eafd371c 2005 if (memEQs(name, len, "\005NCODING"))
cc4c2da6
NC
2006 goto magicalize;
2007 break;
9ebf26ad 2008 case '\007': /* $^GLOBAL_PHASE */
eafd371c 2009 if (memEQs(name, len, "\007LOBAL_PHASE"))
9ebf26ad
FR
2010 goto ro_magicalize;
2011 break;
8561ea1d 2012 case '\014': /* $^LAST_FH */
eafd371c 2013 if (memEQs(name, len, "\014AST_FH"))
8561ea1d
FC
2014 goto ro_magicalize;
2015 break;
cde0cee5 2016 case '\015': /* $^MATCH */
eafd371c 2017 if (memEQs(name, len, "\015ATCH")) {
960b831f
NC
2018 paren = RX_BUFF_IDX_CARET_FULLMATCH;
2019 goto storeparen;
2020 }
66230c86 2021 break;
cc4c2da6 2022 case '\017': /* $^OPEN */
eafd371c 2023 if (memEQs(name, len, "\017PEN"))
cc4c2da6
NC
2024 goto magicalize;
2025 break;
cde0cee5 2026 case '\020': /* $^PREMATCH $^POSTMATCH */
eafd371c 2027 if (memEQs(name, len, "\020REMATCH")) {
960b831f
NC
2028 paren = RX_BUFF_IDX_CARET_PREMATCH;
2029 goto storeparen;
2030 }
eafd371c 2031 if (memEQs(name, len, "\020OSTMATCH")) {
960b831f
NC
2032 paren = RX_BUFF_IDX_CARET_POSTMATCH;
2033 goto storeparen;
2034 }
9ebf26ad 2035 break;
cc4c2da6 2036 case '\024': /* ${^TAINT} */
eafd371c 2037 if (memEQs(name, len, "\024AINT"))
cc4c2da6
NC
2038 goto ro_magicalize;
2039 break;
7cebcbc0 2040 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
eafd371c 2041 if (memEQs(name, len, "\025NICODE"))
cc4c2da6 2042 goto ro_magicalize;
eafd371c 2043 if (memEQs(name, len, "\025TF8LOCALE"))
7cebcbc0 2044 goto ro_magicalize;
eafd371c 2045 if (memEQs(name, len, "\025TF8CACHE"))
e07ea26a 2046 goto magicalize;
cc4c2da6
NC
2047 break;
2048 case '\027': /* $^WARNING_BITS */
eafd371c 2049 if (memEQs(name, len, "\027ARNING_BITS"))
cc4c2da6 2050 goto magicalize;
8ca2a5d6 2051#ifdef WIN32
eafd371c 2052 else if (memEQs(name, len, "\027IN32_SLOPPY_STAT"))
8ca2a5d6
DD
2053 goto magicalize;
2054#endif
cc4c2da6
NC
2055 break;
2056 case '1':
2057 case '2':
2058 case '3':
2059 case '4':
2060 case '5':
2061 case '6':
2062 case '7':
2063 case '8':
2064 case '9':
85e6fe83 2065 {
2fdbfb4d
AB
2066 /* Ensures that we have an all-digit variable, ${"1foo"} fails
2067 this test */
22ff3130
HS
2068 UV uv;
2069 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1321bbe3 2070 goto ret;
22ff3130
HS
2071 /* XXX why are we using a SSize_t? */
2072 paren = (SSize_t)(I32)uv;
960b831f 2073 goto storeparen;
1d7c1841 2074 }
dc437b57 2075 }
93a17b20 2076 }
392db708
NC
2077 } else {
2078 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2079 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2080 switch (*name) {
6361f656 2081 case '&': /* $& */
960b831f
NC
2082 paren = RX_BUFF_IDX_FULLMATCH;
2083 goto sawampersand;
6361f656 2084 case '`': /* $` */
960b831f
NC
2085 paren = RX_BUFF_IDX_PREMATCH;
2086 goto sawampersand;
6361f656 2087 case '\'': /* $' */
960b831f
NC
2088 paren = RX_BUFF_IDX_POSTMATCH;
2089 sawampersand:
1a904fc8 2090#ifdef PERL_SAWAMPERSAND
a289ef89 2091 if (!(
cc4c2da6
NC
2092 sv_type == SVt_PVAV ||
2093 sv_type == SVt_PVHV ||
2094 sv_type == SVt_PVCV ||
2095 sv_type == SVt_PVFM ||
2096 sv_type == SVt_PVIO
d3b97530
DM
2097 )) { PL_sawampersand |=
2098 (*name == '`')
2099 ? SAWAMPERSAND_LEFT
2100 : (*name == '&')
2101 ? SAWAMPERSAND_MIDDLE
2102 : SAWAMPERSAND_RIGHT;
2103 }
1a904fc8 2104#endif
960b831f 2105 goto storeparen;
e91d8259
NC
2106 case '1': /* $1 */
2107 case '2': /* $2 */
2108 case '3': /* $3 */
2109 case '4': /* $4 */
2110 case '5': /* $5 */
2111 case '6': /* $6 */
2112 case '7': /* $7 */
2113 case '8': /* $8 */
2114 case '9': /* $9 */
960b831f
NC
2115 paren = *name - '0';
2116
2117 storeparen:
e91d8259
NC
2118 /* Flag the capture variables with a NULL mg_ptr
2119 Use mg_len for the array index to lookup. */
960b831f 2120 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2121 break;
cc4c2da6 2122
6361f656 2123 case ':': /* $: */
c69033f2 2124 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
2125 goto magicalize;
2126
6361f656 2127 case '?': /* $? */
ff0cee69 2128#ifdef COMPLEX_STATUS
c69033f2 2129 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2130#endif
cc4c2da6 2131 goto magicalize;
ff0cee69 2132
6361f656 2133 case '!': /* $! */
67261566 2134 GvMULTI_on(gv);
44a2ac75 2135 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2136
ad64d0ec 2137 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2138
7c719134 2139 /* magicalization must be done before require_tie_mod_s is called */
67261566 2140 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
7c719134 2141 require_tie_mod_s(gv, '!', "Errno", 1);
d2c93421 2142
6cef1e77 2143 break;
754f85ad
YO
2144 case '-': /* $-, %-, @- */
2145 case '+': /* $+, %+, @+ */
27deb0cf
YO
2146 GvMULTI_on(gv); /* no used once warnings here */
2147 { /* $- $+ */
2148 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
2149 if (*name == '+')
2150 SvREADONLY_on(GvSVn(gv));
2151 }
2152 { /* %- %+ */
2153 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
2154 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture",0);
2155 }
2156 { /* @- @+ */
2157 AV* const av = GvAVn(gv);
2158 const UV uv = (UV)*name;
67261566 2159
27deb0cf
YO
2160 sv_magic(MUTABLE_SV(av), (SV*)uv, PERL_MAGIC_regdata, NULL, 0);
2161 SvREADONLY_on(av);
2162 }
80305961 2163 break;
a678626e
A
2164 case '*': /* $* */
2165 case '#': /* $# */
2166 if (sv_type == SVt_PV)
37398dc1 2167 /* diag_listed_as: $* is no longer supported. Its use will be fatal in Perl 5.30 */
a678626e 2168 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
37398dc1
A
2169 "$%c is no longer supported. Its use "
2170 "will be fatal in Perl 5.30", *name);
a678626e 2171 break;
b3ca2e83
NC
2172 case '\010': /* $^H */
2173 {
2174 HV *const hv = GvHVn(gv);
2175 hv_magic(hv, NULL, PERL_MAGIC_hints);
2176 }
2177 goto magicalize;
b82b06b8 2178 case '[': /* $[ */
7d69d4a6 2179 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2180 && FEATURE_ARYBASE_IS_ENABLED) {
7c719134 2181 require_tie_mod_s(gv,'[',"arybase",0);
b82b06b8 2182 }
7d69d4a6 2183 else goto magicalize;
b82b06b8 2184 break;
cc4c2da6 2185 case '\023': /* $^S */
2fdbfb4d
AB
2186 ro_magicalize:
2187 SvREADONLY_on(GvSVn(gv));
924ba076 2188 /* FALLTHROUGH */
6361f656 2189 case '0': /* $0 */
6361f656
AB
2190 case '^': /* $^ */
2191 case '~': /* $~ */
2192 case '=': /* $= */
2193 case '%': /* $% */
2194 case '.': /* $. */
2195 case '(': /* $( */
2196 case ')': /* $) */
2197 case '<': /* $< */
2198 case '>': /* $> */
2199 case '\\': /* $\ */
2200 case '/': /* $/ */
4505a31f 2201 case '|': /* $| */
9cdac2a2 2202 case '$': /* $$ */
cc4c2da6
NC
2203 case '\001': /* $^A */
2204 case '\003': /* $^C */
2205 case '\004': /* $^D */
2206 case '\005': /* $^E */
2207 case '\006': /* $^F */
cc4c2da6
NC
2208 case '\011': /* $^I, NOT \t in EBCDIC */
2209 case '\016': /* $^N */
2210 case '\017': /* $^O */
2211 case '\020': /* $^P */
2212 case '\024': /* $^T */
2213 case '\027': /* $^W */
2214 magicalize:
ad64d0ec 2215 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2216 break;
e521374c 2217
cc4c2da6 2218 case '\014': /* $^L */
76f68e9b 2219 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2220 break;
6361f656 2221 case ';': /* $; */
76f68e9b 2222 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2223 break;
6361f656 2224 case ']': /* $] */
cc4c2da6 2225 {
3638bf15 2226 SV * const sv = GvSV(gv);
d7aa5382 2227 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2228 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
2229 GvSV(gv) = vnumify(PL_patchlevel);
2230 SvREADONLY_on(GvSV(gv));
2231 SvREFCNT_dec(sv);
93a17b20
LW
2232 }
2233 break;
cc4c2da6
NC
2234 case '\026': /* $^V */
2235 {
3638bf15 2236 SV * const sv = GvSV(gv);
f9be5ac8
DM
2237 GvSV(gv) = new_version(PL_patchlevel);
2238 SvREADONLY_on(GvSV(gv));
2239 SvREFCNT_dec(sv);
16070b82
GS
2240 }
2241 break;
ea238638
FC
2242 case 'a':
2243 case 'b':
dc3e91f6 2244 if (sv_type == SVt_PV)
ea238638 2245 GvMULTI_on(gv);
cc4c2da6 2246 }
79072805 2247 }
930867a8 2248
1321bbe3
FC
2249 ret:
2250 /* Return true if we actually did something. */
2251 return GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv)
2252 || ( GvSV(gv) && (
2253 SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv))
2254 )
2255 );
71c35c05
BF
2256}
2257
8c995aba
FC
2258/* If we do ever start using this later on in the file, we need to make
2259 sure we don’t accidentally use the wrong definition. */
2260#undef SvREADONLY_on
2261
070dc475
BF
2262/* This function is called when the stash already holds the GV of the magic
2263 * variable we're looking for, but we need to check that it has the correct
2264 * kind of magic. For example, if someone first uses $! and then %!, the
2265 * latter would end up here, and we add the Errno tie to the HASH slot of
2266 * the *! glob.
2267 */
2268PERL_STATIC_INLINE void
2269S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2270{
2271 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2272
2273 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2274 if (*name == '!')
7c719134 2275 require_tie_mod_s(gv, '!', "Errno", 1);
070dc475 2276 else if (*name == '-' || *name == '+')
7c719134 2277 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture", 0);
a678626e
A
2278 } else if (sv_type == SVt_PV) {
2279 if (*name == '*' || *name == '#') {
37398dc1 2280 /* diag_listed_as: $# is no longer supported. Its use will be fatal in Perl 5.30 */
a678626e
A
2281 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2282 WARN_SYNTAX),
37398dc1
A
2283 "$%c is no longer supported. Its use "
2284 "will be fatal in Perl 5.30", *name);
a678626e 2285 }
070dc475
BF
2286 }
2287 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2288 switch (*name) {
2289 case '[':
7c719134 2290 require_tie_mod_s(gv,'[',"arybase",0);
070dc475
BF
2291 break;
2292#ifdef PERL_SAWAMPERSAND
2293 case '`':
2294 PL_sawampersand |= SAWAMPERSAND_LEFT;
2295 (void)GvSVn(gv);
2296 break;
2297 case '&':
2298 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2299 (void)GvSVn(gv);
2300 break;
2301 case '\'':
2302 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2303 (void)GvSVn(gv);
2304 break;
2305#endif
2306 }
2307 }
2308}
2309
71c35c05
BF
2310GV *
2311Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2312 const svtype sv_type)
2313{
71c35c05
BF
2314 const char *name = nambeg;
2315 GV *gv = NULL;
2316 GV**gvp;
2317 STRLEN len;
2318 HV *stash = NULL;
2319 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2320 const I32 no_expand = flags & GV_NOEXPAND;
2321 const I32 add = flags & ~GV_NOADD_MASK;
2322 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2323 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF
2324 const char *const name_end = nambeg + full_len;
2325 U32 faking_it;
2326
2327 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2328
2329 /* If we have GV_NOTQUAL, the caller promised that
2330 * there is no stash, so we can skip the check.
2331 * Similarly if full_len is 0, since then we're
2332 * dealing with something like *{""} or ""->foo()
2333 */
2334 if ((flags & GV_NOTQUAL) || !full_len) {
2335 len = full_len;
2336 }
2337 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2338 if (name == name_end) return gv;
2339 }
2340 else {
2341 return NULL;
2342 }
2343
2344 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2345 return NULL;
2346 }
2347
2348 /* By this point we should have a stash and a name */
c161da64 2349 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF
2350 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2351 if (addmg) gv = (GV *)newSV(0);
2352 else return NULL;
2353 }
2354 else gv = *gvp, addmg = 0;
2355 /* From this point on, addmg means gv has not been inserted in the
2356 symtab yet. */
2357
2358 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF
2359 /* The GV already exists, so return it, but check if we need to do
2360 * anything else with it before that.
2361 */
71c35c05 2362 if (add) {
c002ae9a
BF
2363 /* This is the heuristic that handles if a variable triggers the
2364 * 'used only once' warning. If there's already a GV in the stash
2365 * with this name, then we assume that the variable has been used
2366 * before and turn its MULTI flag on.
2367 * It's a heuristic because it can easily be "tricked", like with
2368 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2369 * not warning about $main::foo being used just once
2370 */
71c35c05
BF
2371 GvMULTI_on(gv);
2372 gv_init_svtype(gv, sv_type);
2373 /* You reach this path once the typeglob has already been created,
2374 either by the same or a different sigil. If this path didn't
2375 exist, then (say) referencing $! first, and %! second would
2376 mean that %! was not handled correctly. */
2377 if (len == 1 && stash == PL_defstash) {
070dc475 2378 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF
2379 }
2380 else if (len == 3 && sv_type == SVt_PVAV
eafd371c 2381 && strEQs(name, "ISA")
71c35c05
BF
2382 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2383 gv_magicalize_isa(gv);
2384 }
2385 return gv;
2386 } else if (no_init) {
2387 assert(!addmg);
2388 return gv;
c002ae9a
BF
2389 }
2390 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2391 * don't expand it to a glob. This is an optimization so that things
2392 * copying constants over, like Exporter, don't have to be rewritten
2393 * to take into account that you can store more than just globs in
2394 * stashes.
2395 */
2396 else if (no_expand && SvROK(gv)) {
71c35c05
BF
2397 assert(!addmg);
2398 return gv;
2399 }
2400
2401 /* Adding a new symbol.
2402 Unless of course there was already something non-GV here, in which case
2403 we want to behave as if there was always a GV here, containing some sort
2404 of subroutine.
2405 Otherwise we run the risk of creating things like GvIO, which can cause
2406 subtle bugs. eg the one that tripped up SQL::Translator */
2407
2408 faking_it = SvOK(gv);
2409
2410 if (add & GV_ADDWARN)
2411 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
147e3846 2412 "Had to create %" UTF8f " unexpectedly",
71c35c05
BF
2413 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2414 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2415
7a207065
KW
2416 if ( full_len != 0
2417 && isIDFIRST_lazy_if_safe(name, name + full_len, is_utf8)
2418 && !ckWARN(WARN_ONCE) )
2419 {
71c35c05 2420 GvMULTI_on(gv) ;
7a207065 2421 }
71c35c05
BF
2422
2423 /* set up magic where warranted */
1321bbe3 2424 if ( gv_magicalize(gv, stash, name, len, sv_type) ) {
930867a8 2425 /* See 23496c6 */
1321bbe3
FC
2426 if (addmg) {
2427 /* gv_magicalize magicalised this gv, so we want it
930867a8 2428 * stored in the symtab.
1321bbe3
FC
2429 * Effectively the caller is asking, ‘Does this gv exist?’
2430 * And we respond, ‘Er, *now* it does!’
930867a8
BF
2431 */
2432 (void)hv_store(stash,name,len,(SV *)gv,0);
1321bbe3
FC
2433 }
2434 }
2435 else if (addmg) {
2436 /* The temporary GV created above */
930867a8
BF
2437 SvREFCNT_dec_NN(gv);
2438 gv = NULL;
930867a8 2439 }
71c35c05 2440
e6066781 2441 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2442 return gv;
79072805
LW
2443}
2444
2445void
35a4481c 2446Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2447{
ed60a868 2448 const char *name;
35a4481c 2449 const HV * const hv = GvSTASH(gv);
7918f24d
NC
2450
2451 PERL_ARGS_ASSERT_GV_FULLNAME4;
2452
666ea192 2453 sv_setpv(sv, prefix ? prefix : "");
a0288114 2454
52a6327b 2455 if (hv && (name = HvNAME(hv))) {
ed60a868
FC
2456 const STRLEN len = HvNAMELEN(hv);
2457 if (keepmain || strnNE(name, "main", len)) {
2458 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2459 sv_catpvs(sv,"::");
ed60a868 2460 }
43693395 2461 }
ed60a868 2462 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2463 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2464}
2465
2466void
35a4481c 2467Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2468{
099be4f1 2469 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2470
2471 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2472
46c461b5 2473 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2474}
2475
39a65960
DM
2476
2477/* recursively scan a stash and any nested stashes looking for entries
2478 * that need the "only used once" warning raised
2479 */
2480
79072805 2481void
51da40ed 2482Perl_gv_check(pTHX_ HV *stash)
79072805 2483{
eb578fdb 2484 I32 i;
463ee0b2 2485
7918f24d
NC
2486 PERL_ARGS_ASSERT_GV_CHECK;
2487
9e5cda6b 2488 if (!SvOOK(stash))
8990e307 2489 return;
90754377 2490
9e5cda6b 2491 assert(HvARRAY(stash));
90754377 2492
a0d0e21e 2493 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2494 const HE *entry;
90754377 2495 /* mark stash is being scanned, to avoid recursing */
339441ef 2496 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2497 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2498 GV *gv;
b7787f18 2499 HV *hv;
e7acdfe9
DM
2500 STRLEN keylen = HeKLEN(entry);
2501 const char * const key = HeKEY(entry);
2502
2503 if (keylen >= 2 && key[keylen-2] == ':' && key[keylen-1] == ':' &&
159b6efe 2504 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2505 {
90754377
DM
2506 if (hv != PL_defstash && hv != stash
2507 && !(SvOOK(hv)
2508 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2509 )
a0d0e21e
LW
2510 gv_check(hv); /* nested package */
2511 }
7a207065
KW
2512 else if ( HeKLEN(entry) != 0
2513 && *HeKEY(entry) != '_'
2514 && isIDFIRST_lazy_if_safe(HeKEY(entry),
2515 HeKEY(entry) + HeKLEN(entry),
2516 HeUTF8(entry)) )
2517 {
e1ec3a88 2518 const char *file;
159b6efe 2519 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2520 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2521 continue;
1d7c1841 2522 file = GvFILE(gv);
1d7c1841 2523 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC
2524#ifdef USE_ITHREADS
2525 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2526#else
2527 CopFILEGV(PL_curcop)
2528 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2529#endif
9014280d 2530 Perl_warner(aTHX_ packWARN(WARN_ONCE),
147e3846 2531 "Name \"%" HEKf "::%" HEKf
d0c0e7dd
FC
2532 "\" used only once: possible typo",
2533 HEKfARG(HvNAME_HEK(stash)),
2534 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2535 }
79072805 2536 }
339441ef 2537 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW
2538 }
2539}
2540
2541GV *
9cc50d5b 2542Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2543{
9cc50d5b 2544 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2545 assert(!(flags & ~SVf_UTF8));
7918f24d 2546
147e3846 2547 return gv_fetchpv(Perl_form(aTHX_ "%" UTF8f "::_GEN_%ld",
b17a0679 2548 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF
2549 (long)PL_gensym++),
2550 GV_ADD, SVt_PVGV);
79072805
LW
2551}
2552
2553/* hopefully this is only called on local symbol table entries */
2554
2555GP*
864dbfa3 2556Perl_gp_ref(pTHX_ GP *gp)
79072805 2557{
1d7c1841 2558 if (!gp)
d4c19fe8 2559 return NULL;
79072805 2560 gp->gp_refcnt++;
44a8e56a
PP
2561 if (gp->gp_cv) {
2562 if (gp->gp_cvgen) {
e1a479c5
BB
2563 /* If the GP they asked for a reference to contains
2564 a method cache entry, clear it first, so that we
2565 don't infect them with our cached entry */
e7881358 2566 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2567 gp->gp_cv = NULL;
44a8e56a
PP
2568 gp->gp_cvgen = 0;
2569 }
44a8e56a 2570 }
79072805 2571 return gp;
79072805
LW
2572}
2573
2574void
864dbfa3 2575Perl_gp_free(pTHX_ GV *gv)
79072805 2576{
79072805 2577 GP* gp;
b0d55c99 2578 int attempts = 100;
79072805 2579
f7877b28 2580 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2581 return;
f248d071 2582 if (gp->gp_refcnt == 0) {
9b387841
NC
2583 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2584 "Attempt to free unreferenced glob pointers"
2585 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2586 return;
2587 }
4571f4a7 2588 if (gp->gp_refcnt > 1) {
bc81b34d 2589 borrowed:
748a9306
LW
2590 if (gp->gp_egv == gv)
2591 gp->gp_egv = 0;
4571f4a7 2592 gp->gp_refcnt--;
c43ae56f 2593 GvGP_set(gv, NULL);
79072805 2594 return;
748a9306 2595 }
79072805 2596
b0d55c99
FC
2597 while (1) {
2598 /* Copy and null out all the glob slots, so destructors do not see
2599 freed SVs. */
2600 HEK * const file_hek = gp->gp_file_hek;
2601 SV * const sv = gp->gp_sv;
2602 AV * const av = gp->gp_av;
2603 HV * const hv = gp->gp_hv;
2604 IO * const io = gp->gp_io;
2605 CV * const cv = gp->gp_cv;
2606 CV * const form = gp->gp_form;
2607
2608 gp->gp_file_hek = NULL;
2609 gp->gp_sv = NULL;
2610 gp->gp_av = NULL;
2611 gp->gp_hv = NULL;
2612 gp->gp_io = NULL;
2613 gp->gp_cv = NULL;
2614 gp->gp_form = NULL;
2615
2616 if (file_hek)
2617 unshare_hek(file_hek);
2618
2619 SvREFCNT_dec(sv);
2620 SvREFCNT_dec(av);
2621 /* FIXME - another reference loop GV -> symtab -> GV ?
2622 Somehow gp->gp_hv can end up pointing at freed garbage. */
2623 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2624 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC
2625 if (PL_stashcache && hvname_hek) {
2626 DEBUG_o(Perl_deb(aTHX_
147e3846 2627 "gp_free clearing PL_stashcache for '%" HEKf "'\n",
923ed580 2628 HEKfARG(hvname_hek)));
0ca9877d 2629 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2630 }
b0d55c99
FC
2631 SvREFCNT_dec(hv);
2632 }
96d7c888
FC
2633 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2634 && (IoTYPE(io) == IoTYPE_WRONLY ||
2635 IoTYPE(io) == IoTYPE_RDWR ||
2636 IoTYPE(io) == IoTYPE_APPEND)
2637 && ckWARN_d(WARN_IO)
2638 && IoIFP(io) != PerlIO_stdin()
2639 && IoIFP(io) != PerlIO_stdout()
2640 && IoIFP(io) != PerlIO_stderr()
2641 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2642 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC
2643 SvREFCNT_dec(io);
2644 SvREFCNT_dec(cv);
2645 SvREFCNT_dec(form);
2646
bc81b34d
FC
2647 /* Possibly reallocated by a destructor */
2648 gp = GvGP(gv);
2649
b0d55c99
FC
2650 if (!gp->gp_file_hek
2651 && !gp->gp_sv
2652 && !gp->gp_av
2653 && !gp->gp_hv
2654 && !gp->gp_io
2655 && !gp->gp_cv
2656 && !gp->gp_form) break;
2657
2658 if (--attempts == 0) {
2659 Perl_die(aTHX_
2660 "panic: gp_free failed to free glob pointer - "
2661 "something is repeatedly re-creating entries"
2662 );
2663 }
13207a71 2664 }
748a9306 2665
bc81b34d
FC
2666 /* Possibly incremented by a destructor doing glob assignment */
2667 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2668 Safefree(gp);
c43ae56f 2669 GvGP_set(gv, NULL);
79072805
LW
2670}
2671
d460ef45
NIS
2672int
2673Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2674{
53c1dcc0
AL
2675 AMT * const amtp = (AMT*)mg->mg_ptr;
2676 PERL_UNUSED_ARG(sv);
dd374669 2677
7918f24d
NC
2678 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2679
d460ef45
NIS
2680 if (amtp && AMT_AMAGIC(amtp)) {
2681 int i;
2682 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2683 CV * const cv = amtp->table[i];
b37c2d43 2684 if (cv) {
e7881358 2685 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2686 amtp->table[i] = NULL;
d460ef45
NIS
2687 }
2688 }
2689 }
2690 return 0;
2691}
2692
a0d0e21e 2693/* Updates and caches the CV's */
c3a9a790
RGS
2694/* Returns:
2695 * 1 on success and there is some overload
2696 * 0 if there is no overload
2697 * -1 if some error occurred and it couldn't croak
2698 */
a0d0e21e 2699
c3a9a790 2700int
242f8760 2701Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2702{
ad64d0ec 2703 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2704 AMT amt;
9b439311 2705 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2706 U32 newgen;
a0d0e21e 2707
7918f24d
NC
2708 PERL_ARGS_ASSERT_GV_AMUPDATE;
2709
9b439311 2710 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2711 if (mg) {
2712 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2713 if (amtp->was_ok_sub == newgen) {
8c34e50d 2714 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2715 }
ad64d0ec 2716 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2717 }
a0d0e21e 2718
bfcb3514 2719 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2720
d460ef45 2721 Zero(&amt,1,AMT);
e1a479c5 2722 amt.was_ok_sub = newgen;
a6006777
PP
2723 amt.fallback = AMGfallNO;
2724 amt.flags = 0;
2725
a6006777 2726 {
8c34e50d
FC
2727 int filled = 0;
2728 int i;
3d147ac2
DM
2729 bool deref_seen = 0;
2730
a6006777 2731
3866ea3b 2732 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2733
89ffc314 2734 /* Try to find via inheritance. */
e6919483 2735 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2736 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2737 CV* cv;
89ffc314
IZ
2738
2739 if (!gv)
3866ea3b
FC
2740 {
2741 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2742 goto no_table;
3866ea3b
FC
2743 }
2744#ifdef PERL_DONT_CREATE_GVSV
2745 else if (!sv) {
6f207bd3 2746 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC
2747 }
2748#endif
79c9643d
JL
2749 else if (SvTRUE(sv))
2750 /* don't need to set overloading here because fallback => 1
2751 * is the default setting for classes without overloading */
89ffc314 2752 amt.fallback=AMGfallYES;
79c9643d
JL
2753 else if (SvOK(sv)) {
2754 amt.fallback=AMGfallNEVER;
386a5489 2755 filled = 1;
386a5489 2756 }
79c9643d 2757 else {
386a5489 2758 filled = 1;
386a5489 2759 }
a6006777 2760
3d147ac2 2761 assert(SvOOK(stash));
3d147ac2 2762 /* initially assume the worst */
339441ef 2763 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2764
8c34e50d 2765 for (i = 1; i < NofAMmeth; i++) {
6136c704 2766 const char * const cooky = PL_AMG_names[i];
32251b26 2767 /* Human-readable form, for debugging: */
8c34e50d 2768 const char * const cp = AMG_id2name(i);
d279ab82 2769 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2770
a0288114 2771 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2772 cp, HvNAME_get(stash)) );
611c1e95
IZ
2773 /* don't fill the cache while looking up!
2774 Creation of inheritance stubs in intermediate packages may
2775 conflict with the logic of runtime method substitution.
2776 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2777 then we could have created stubs for "(+0" in A and C too.
2778 But if B overloads "bool", we may want to use it for
2779 numifying instead of C's "+0". */
8c34e50d 2780 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2781 cv = 0;
c3ad4e54
FC
2782 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2783 const HEK * const gvhek =
2784 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2785 const HEK * const stashek =
2786 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2787 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2788 && stashek && HEK_LEN(stashek) == 8
2789 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ
2790 /* This is a hack to support autoloading..., while
2791 knowing *which* methods were declared as overloaded. */
44a8e56a 2792 /* GvSV contains the name of the method. */
6136c704 2793 GV *ngv = NULL;
c69033f2 2794 SV *gvsv = GvSV(gv);
a0288114 2795
147e3846 2796 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%" SVf256\
a0288114 2797 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2798 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2799 if (!gvsv || !SvPOK(gvsv)
7f415459 2800 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2801 {
a0288114 2802 /* Can be an import stub (created by "can"). */
242f8760 2803 if (destructing) {
c3a9a790 2804 return -1;
242f8760
RGS
2805 }
2806 else {
d66cca07
BF
2807 const SV * const name = (gvsv && SvPOK(gvsv))
2808 ? gvsv
2809 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2810 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
147e3846 2811 Perl_croak(aTHX_ "%s method \"%" SVf256
d66cca07 2812 "\" overloading \"%s\" "\
147e3846 2813 "in package \"%" HEKf256 "\"",
242f8760
RGS
2814 (GvCVGEN(gv) ? "Stub found while resolving"
2815 : "Can't resolve"),
d66cca07 2816 SVfARG(name), cp,
d0c0e7dd 2817 HEKfARG(
d66cca07 2818 HvNAME_HEK(stash)
d0c0e7dd 2819 ));
242f8760 2820 }
44a8e56a 2821 }
dc848c6f 2822 cv = GvCV(gv = ngv);
44a8e56a 2823 }
b464bac0 2824 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2825 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2826 GvNAME(CvGV(cv))) );
2827 filled = 1;
611c1e95 2828 } else if (gv) { /* Autoloaded... */
ea726b52 2829 cv = MUTABLE_CV(gv);
611c1e95 2830 filled = 1;
44a8e56a 2831 }
ea726b52 2832 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM
2833
2834 if (gv) {
2835 switch (i) {
2836 case to_sv_amg:
2837 case to_av_amg:
2838 case to_hv_amg:
2839 case to_gv_amg:
2840 case to_cv_amg:
2841 case nomethod_amg:
2842 deref_seen = 1;
2843 break;
2844 }
2845 }
a0d0e21e 2846 }
3d147ac2 2847 if (!deref_seen)
45479970
DM
2848 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2849 * NB - aux var invalid here, HvARRAY() could have been
2850 * reallocated since it was assigned to */
2851 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2852
a0d0e21e 2853 if (filled) {
a6006777 2854 AMT_AMAGIC_on(&amt);
ad64d0ec 2855 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2856 (char*)&amt, sizeof(AMT));
8c34e50d 2857 return TRUE;
a0d0e21e
LW
2858 }
2859 }
a6006777 2860 /* Here we have no table: */
8c34e50d 2861 no_table:
a6006777 2862 AMT_AMAGIC_off(&amt);
ad64d0ec 2863 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2864 (char*)&amt, sizeof(AMTS));
c3a9a790 2865 return 0;
a0d0e21e
LW
2866}
2867
32251b26
IZ
2868
2869CV*
2870Perl_gv_handler(pTHX_ HV *stash, I32 id)
2871{
3f8f4626 2872 MAGIC *mg;
32251b26 2873 AMT *amtp;
e1a479c5 2874 U32 newgen;
9b439311 2875 struct mro_meta* stash_meta;
32251b26 2876
bfcb3514 2877 if (!stash || !HvNAME_get(stash))
601f1833 2878 return NULL;
e1a479c5 2879
9b439311
BB
2880 stash_meta = HvMROMETA(stash);
2881 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2882
ad64d0ec 2883 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2884 if (!mg) {
2885 do_update:
8c34e50d 2886 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2887 return NULL;
ad64d0ec 2888 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2889 }
a9fd4e40 2890 assert(mg);
32251b26 2891 amtp = (AMT*)mg->mg_ptr;
66978156 2892 if ( amtp->was_ok_sub != newgen )
32251b26 2893 goto do_update;
3ad83ce7 2894 if (AMT_AMAGIC(amtp)) {
b7787f18 2895 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2896 if (ret && isGV(ret)) { /* Autoloading stab */
2897 /* Passing it through may have resulted in a warning
2898 "Inherited AUTOLOAD for a non-method deprecated", since
2899 our caller is going through a function call, not a method call.
2900 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2901 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2902
2903 if (gv && GvCV(gv))
2904 return GvCV(gv);
2905 }
2906 return ret;
2907 }
a0288114 2908
601f1833 2909 return NULL;
32251b26
IZ
2910}
2911
2912
6f1401dc
DM
2913/* Implement tryAMAGICun_MG macro.
2914 Do get magic, then see if the stack arg is overloaded and if so call it.
2915 Flags:
2916 AMGf_set return the arg using SETs rather than assigning to
2917 the targ
2918 AMGf_numeric apply sv_2num to the stack arg.
2919*/
2920
2921bool
2922Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM
2923 dSP;
2924 SV* tmpsv;
2925 SV* const arg = TOPs;
2926
2927 SvGETMAGIC(arg);
2928
9f8bf298 2929 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC
2930 AMGf_noright | AMGf_unary
2931 | (flags & AMGf_numarg))))
2932 {
6f1401dc
DM
2933 if (flags & AMGf_set) {
2934 SETs(tmpsv);
2935 }
2936 else {
2937 dTARGET;
2938 if (SvPADMY(TARG)) {
2939 sv_setsv(TARG, tmpsv);
2940 SETTARG;
2941 }
2942 else
2943 SETs(tmpsv);
2944 }
2945 PUTBACK;
2946 return TRUE;
2947 }
2948
2949 if ((flags & AMGf_numeric) && SvROK(arg))
2950 *sp = sv_2num(arg);
2951 return FALSE;
2952}
2953
2954
2955/* Implement tryAMAGICbin_MG macro.
2956 Do get magic, then see if the two stack args are overloaded and if so
2957 call it.
2958 Flags:
2959 AMGf_set return the arg using SETs rather than assigning to
2960 the targ
2961 AMGf_assign op may be called as mutator (eg +=)
2962 AMGf_numeric apply sv_2num to the stack arg.
2963*/
2964
2965bool
2966Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM
2967 dSP;
2968 SV* const left = TOPm1s;
2969 SV* const right = TOPs;
2970
2971 SvGETMAGIC(left);
2972 if (left != right)
2973 SvGETMAGIC(right);
2974
2975 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2976 SV * const tmpsv = amagic_call(left, right, method,
636ac8fc
FC
2977 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0)
2978 | (flags & AMGf_numarg));
6f1401dc
DM
2979 if (tmpsv) {
2980 if (flags & AMGf_set) {
2981 (void)POPs;
2982 SETs(tmpsv);
2983 }
2984 else {
2985 dATARGET;
2986 (void)POPs;
2987 if (opASSIGN || SvPADMY(TARG)) {
2988 sv_setsv(TARG, tmpsv);
2989 SETTARG;
2990 }
2991 else
2992 SETs(tmpsv);
2993 }
2994 PUTBACK;
2995 return TRUE;
2996 }
2997 }
75ea7a12
FC
2998 if(left==right && SvGMAGICAL(left)) {
2999 SV * const left = sv_newmortal();
3000 *(sp-1) = left;
3001 /* Print the uninitialized warning now, so it includes the vari-
3002 able name. */
3003 if (!SvOK(right)) {
3004 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
3005 sv_setsv_flags(left, &PL_sv_no, 0);
3006 }
3007 else sv_setsv_flags(left, right, 0);
3008 SvGETMAGIC(right);
3009 }
6f1401dc 3010 if (flags & AMGf_numeric) {
75ea7a12
FC
3011 if (SvROK(TOPm1s))
3012 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
3013 if (SvROK(right))
3014 *sp = sv_2num(right);
3015 }
3016 return FALSE;
3017}
3018
25a9ffce
NC
3019SV *
3020Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
3021 SV *tmpsv = NULL;
3d147ac2 3022 HV *stash;
25a9ffce
NC
3023
3024 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
3025
3d147ac2
DM
3026 if (!SvAMAGIC(ref))
3027 return ref;
3028 /* return quickly if none of the deref ops are overloaded */
3029 stash = SvSTASH(SvRV(ref));
3030 assert(SvOOK(stash));
3031 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
3032 return ref;
3033
3034 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC
3035 AMGf_noright | AMGf_unary))) {
3036 if (!SvROK(tmpsv))
3037 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
3038 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
3039 /* Bail out if it returns us the same reference. */
3040 return tmpsv;
3041 }
3042 ref = tmpsv;
3d147ac2
DM
3043 if (!SvAMAGIC(ref))
3044 break;
25a9ffce
NC
3045 }
3046 return tmpsv ? tmpsv : ref;
3047}
6f1401dc 3048
8d569291
FC
3049bool
3050Perl_amagic_is_enabled(pTHX_ int method)
3051{
3052 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
3053
3054 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
3055
3056 if ( !lex_mask || !SvOK(lex_mask) )
3057 /* overloading lexically disabled */
3058 return FALSE;
3059 else if ( lex_mask && SvPOK(lex_mask) ) {
3060 /* we have an entry in the hints hash, check if method has been
3061 * masked by overloading.pm */
3062 STRLEN len;
3063 const int offset = method / 8;
3064 const int bit = method % 8;
3065 char *pv = SvPV(lex_mask, len);
3066
3067 /* Bit set, so this overloading operator is disabled */
3068 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
3069 return FALSE;
3070 }
3071 return TRUE;
3072}
3073
a0d0e21e 3074SV*
864dbfa3 3075Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 3076{
27da23d5 3077 dVAR;
b267980d 3078 MAGIC *mg;
9c5ffd7c 3079 CV *cv=NULL;
a0d0e21e 3080 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3081 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
3082 int off = 0, off1, lr = 0, notfound = 0;
3083 int postpr = 0, force_cpy = 0;
3084 int assign = AMGf_assign & flags;
3085 const int assignshift = assign ? 1 : 0;
bf5522a1 3086 int use_default_op = 0;
67288365 3087 int force_scalar = 0;
497b47a8
JH
3088#ifdef DEBUGGING
3089 int fl=0;
497b47a8 3090#endif
25716404 3091 HV* stash=NULL;
7918f24d
NC
3092
3093 PERL_ARGS_ASSERT_AMAGIC_CALL;
3094
e46c382e 3095 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3096 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK
3097 }
3098
a0d0e21e 3099 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3100 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3101 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3102 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3103 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3104 : NULL))
b267980d 3105 && ((cv = cvp[off=method+assignshift])
748a9306
LW
3106 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3107 * usual method */
497b47a8
JH
3108 (
3109#ifdef DEBUGGING
3110 fl = 1,
a0288114 3111#endif
497b47a8 3112 cv = cvp[off=method])))) {
a0d0e21e
LW
3113 lr = -1; /* Call method for left argument */
3114 } else {
3115 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3116 int logic;
3117
3118 /* look for substituted methods */
ee239bfe 3119 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
3120 switch (method) {
3121 case inc_amg:
ee239bfe
IZ
3122 force_cpy = 1;
3123 if ((cv = cvp[off=add_ass_amg])
3124 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3125 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
3126 }
3127 break;
3128 case dec_amg:
ee239bfe
IZ
3129 force_cpy = 1;
3130 if ((cv = cvp[off = subtr_ass_amg])
3131 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3132 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
3133 }
3134 break;
3135 case bool__amg:
3136 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3137 break;
3138 case numer_amg:
3139 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3140 break;
3141 case string_amg:
3142 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3143 break;
b7787f18
AL
3144 case not_amg:
3145 (void)((cv = cvp[off=bool__amg])
3146 || (cv = cvp[off=numer_amg])
3147 || (cv = cvp[off=string_amg]));
2ab54efd
MB
3148 if (cv)
3149 postpr = 1;
b7787f18 3150 break;
748a9306
LW
3151 case copy_amg:
3152 {
76e3520e
GS
3153 /*
3154 * SV* ref causes confusion with the interpreter variable of
3155 * the same name
3156 */
890ce7af 3157 SV* const tmpRef=SvRV(left);
76e3520e 3158 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
3159 /*
3160 * Just to be extra cautious. Maybe in some
3161 * additional cases sv_setsv is safe, too.
3162 */
890ce7af 3163 SV* const newref = newSVsv(tmpRef);
748a9306 3164 SvOBJECT_on(newref);
a1cd65be
FC
3165 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3166 delegate to the stash. */
85fbaab2 3167 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
3168 return newref;
3169 }
3170 }
3171 break;
a0d0e21e 3172 case abs_amg:
b267980d 3173 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3174 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3175 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3176 if (off1==lt_amg) {
890ce7af 3177 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3178 lt_amg,AMGf_noright);
3179 logic = SvTRUE(lessp);
3180 } else {
890ce7af 3181 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3182 ncmp_amg,AMGf_noright);
3183 logic = (SvNV(lessp) < 0);
3184 }
3185 if (logic) {
3186 if (off==subtr_amg) {
3187 right = left;
748a9306 3188 left = nullsv;
a0d0e21e
LW
3189 lr = 1;
3190 }
3191 } else {
3192 return left;
3193 }
3194 }
3195 break;
3196 case neg_amg:
155aba94 3197 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW
3198 right = left;
3199 left = sv_2mortal(newSViv(0));
3200 lr = 1;
3201 }
3202 break;
f216259d 3203 case int_amg:
f5284f61 3204 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3205 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3206 case regexp_amg:
b267980d
NIS
3207 /* FAIL safe */
3208 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3209
f5284f61
IZ
3210 case to_sv_amg:
3211 case to_av_amg:
3212 case to_hv_amg:
3213 case to_gv_amg:
3214 case to_cv_amg:
3215 /* FAIL safe */
b267980d 3216 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3217
a0d0e21e
LW
3218 default:
3219 goto not_found;
3220 }
3221 if (!cv) goto not_found;
3222 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3223 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3224 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3225 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3226 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3227 : NULL))
69815d08
RS
3228 && (cv = cvp[off=method])) { /* Method for right
3229 * argument found */
3230 lr=1;
bf5522a1
MB
3231 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3232 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
3233 && !(flags & AMGf_unary)) {
3234 /* We look for substitution for
3235 * comparison operations and
fc36a67e 3236 * concatenation */
a0d0e21e
LW
3237 if (method==concat_amg || method==concat_ass_amg
3238 || method==repeat_amg || method==repeat_ass_amg) {
3239 return NULL; /* Delegate operation to string conversion */
3240 }
3241 off = -1;
3242 switch (method) {
3243 case lt_amg:
3244 case le_amg:
3245 case gt_amg:
3246 case ge_amg:
3247 case eq_amg:
3248 case ne_amg:
2ab54efd
MB
3249 off = ncmp_amg;
3250 break;
a0d0e21e
LW
3251 case slt_amg:
3252 case sle_amg:
3253 case sgt_amg:
3254 case sge_amg:
3255 case seq_amg:
3256 case sne_amg:
2ab54efd
MB
3257 off = scmp_amg;
3258 break;
a0d0e21e 3259 }
bf5522a1
MB
3260 if (off != -1) {
3261 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3262 cv = ocvp[off];
3263 lr = -1;
3264 }
3265 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3266 cv = cvp[off];
3267 lr = 1;
3268 }
3269 }
3270 if (cv)
2ab54efd
MB
3271 postpr = 1;
3272 else
3273 goto not_found;
a0d0e21e 3274 } else {
a6006777 3275 not_found: /* No method found, either report or croak */
b267980d
NIS
3276 switch (method) {
3277 case to_sv_amg:
3278 case to_av_amg:
3279 case to_hv_amg:
3280 case to_gv_amg:
3281 case to_cv_amg:
3282 /* FAIL safe */
3283 return left; /* Delegate operation to standard mechanisms. */
b267980d 3284 }
a0d0e21e
LW
3285 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3286 notfound = 1; lr = -1;
3287 } else if (cvp && (cv=cvp[nomethod_amg])) {
3288 notfound = 1; lr = 1;
bf5522a1
MB
3289 } else if ((use_default_op =
3290 (!ocvp || oamtp->fallback >= AMGfallYES)
3291 && (!cvp || amtp->fallback >= AMGfallYES))
3292 && !DEBUG_o_TEST) {
4cc0ca18
NC
3293 /* Skip generating the "no method found" message. */
3294 return NULL;
a0d0e21e 3295 } else {
46fc3d4c 3296 SV *msg;
774d564b 3297 if (off==-1) off=method;
b267980d 3298 msg = sv_2mortal(Perl_newSVpvf(aTHX_
147e3846 3299 "Operation \"%s\": no method found,%sargument %s%" SVf "%s%" SVf,
d66cca07
BF
3300 AMG_id2name(method + assignshift),
3301 (flags & AMGf_unary ? " " : "\n\tleft "),
3302 SvAMAGIC(left)?
3303 "in overloaded package ":
3304 "has no overloaded magic",
3305 SvAMAGIC(left)?
3306 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3307 SVfARG(&PL_sv_no),
3308 SvAMAGIC(right)?
3309 ",\n\tright argument in overloaded package ":
3310 (flags & AMGf_unary
3311 ? ""
3312 : ",\n\tright argument has no overloaded magic"),
3313 SvAMAGIC(right)?
3314 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3315 SVfARG(&PL_sv_no)));
bf5522a1 3316 if (use_default_op) {
147e3846 3317 DEBUG_o( Perl_deb(aTHX_ "%" SVf, SVfARG(msg)) );
a0d0e21e 3318 } else {
147e3846 3319 Perl_croak(aTHX_ "%" SVf, SVfARG(msg));
a0d0e21e
LW
3320 }
3321 return NULL;
3322 }
ee239bfe 3323 force_cpy = force_cpy || assign;
a0d0e21e
LW
3324 }
3325 }
67288365
JL
3326
3327 switch (method) {
3328 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3329 * operation. we need this to return a value, so that it can be assigned
3330 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3331 * increment or decrement was itself called in void context */
3332 case inc_amg:
3333 if (off == add_amg)
3334 force_scalar = 1;
3335 break;
3336 case dec_amg:
3337 if (off == subtr_amg)
3338 force_scalar = 1;
3339 break;
3340 /* in these cases, we're calling an assignment variant of an operator
3341 * (+= rather than +, for instance). regardless of whether it's a
3342 * fallback or not, it always has to return a value, which will be
3343 * assigned to the proper variable later */
3344 case add_amg:
3345 case subtr_amg:
3346 case mult_amg:
3347 case div_amg:
3348 case modulo_amg:
3349 case pow_amg:
3350 case lshift_amg:
3351 case rshift_amg:
3352 case repeat_amg:
3353 case concat_amg:
3354 case band_amg:
3355 case bor_amg:
3356 case bxor_amg:
6d06ecce
FC
3357 case sband_amg:
3358 case sbor_amg:
3359 case sbxor_amg:
67288365
JL
3360 if (assign)
3361 force_scalar = 1;
3362 break;
3363 /* the copy constructor always needs to return a value */
3364 case copy_amg:
3365 force_scalar = 1;
3366 break;
3367 /* because of the way these are implemented (they don't perform the
3368 * dereferencing themselves, they return a reference that perl then
3369 * dereferences later), they always have to be in scalar context */
3370 case to_sv_amg:
3371 case to_av_amg:
3372 case to_hv_amg:
3373 case to_gv_amg:
3374 case to_cv_amg:
3375 force_scalar = 1;
3376 break;
3377 /* these don't have an op of their own; they're triggered by their parent
3378 * op, so the context there isn't meaningful ('$a and foo()' in void
3379 * context still needs to pass scalar context on to $a's bool overload) */
3380 case bool__amg:
3381 case numer_amg:
3382 case string_amg:
3383 force_scalar = 1;
3384 break;
3385 }
3386
497b47a8 3387#ifdef DEBUGGING
a0d0e21e 3388 if (!notfound) {
497b47a8 3389 DEBUG_o(Perl_deb(aTHX_
147e3846 3390 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %" SVf "%s\n",
497b47a8
JH
3391 AMG_id2name(off),
3392 method+assignshift==off? "" :
a0288114 3393 " (initially \"",
497b47a8
JH
3394 method+assignshift==off? "" :
3395 AMG_id2name(method+assignshift),
a0288114 3396 method+assignshift==off? "" : "\")",
497b47a8
JH
3397 flags & AMGf_unary? "" :
3398 lr==1 ? " for right argument": " for left argument",
3399 flags & AMGf_unary? " for argument" : "",
d66cca07 3400 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3401 fl? ",\n\tassignment variant used": "") );
ee239bfe 3402 }
497b47a8 3403#endif
748a9306
LW
3404 /* Since we use shallow copy during assignment, we need
3405 * to dublicate the contents, probably calling user-supplied
3406 * version of copy operator
3407 */
ee239bfe
IZ
3408 /* We need to copy in following cases:
3409 * a) Assignment form was called.
3410 * assignshift==1, assign==T, method + 1 == off
3411 * b) Increment or decrement, called directly.
3412 * assignshift==0, assign==0, method + 0 == off
3413 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3414 * assignshift==0, assign==T,
ee239bfe
IZ
3415 * force_cpy == T
3416 * d) Increment or decrement, translated to nomethod.
b267980d 3417 * assignshift==0, assign==0,
ee239bfe
IZ
3418 * force_cpy == T
3419 * e) Assignment form translated to nomethod.
3420 * assignshift==1, assign==T, method + 1 != off
3421 * force_cpy == T
3422 */
3423 /* off is method, method+assignshift, or a result of opcode substitution.
3424 * In the latter case assignshift==0, so only notfound case is important.
3425 */
73512201 3426 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3427 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3428 || force_cpy) )
6f1401dc 3429 {
1b38c28e
NC
3430 /* newSVsv does not behave as advertised, so we copy missing
3431 * information by hand */
3432 SV *tmpRef = SvRV(left);
3433 SV *rv_copy;
31d632c3 3434 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
3435 SvRV_set(left, rv_copy);
3436 SvSETMAGIC(left);
e7881358 3437 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3438 }
6f1401dc
DM
3439 }
3440
a0d0e21e
LW
3441 {
3442 dSP;
3443 BINOP myop;
3444 SV* res;
b7787f18 3445 const bool oldcatch = CATCH_GET;
67288365 3446 I32 oldmark, nret;
1c23e2bd 3447 U8 gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3448
54310121 3449 CATCH_SET(TRUE);
a0d0e21e
LW
3450 Zero(&myop, 1, BINOP);
3451 myop.op_last = (OP *) &myop;
b37c2d43 3452 myop.op_next = NULL;
67288365
JL
3453 myop.op_flags = OPf_STACKED;
3454
3455 switch (gimme) {
3456 case G_VOID:
3457 myop.op_flags |= OPf_WANT_VOID;
3458 break;
3459 case G_ARRAY:
3460 if (flags & AMGf_want_list) {
3461 myop.op_flags |= OPf_WANT_LIST;
3462 break;
3463 }
3464 /* FALLTHROUGH */
3465 default:
3466 myop.op_flags |= OPf_WANT_SCALAR;
3467 break;
3468 }
a0d0e21e 3469
e788e7d3 3470 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3471 ENTER;
462e5cf6 3472 SAVEOP();
533c011a 3473 PL_op = (OP *) &myop;
3280af22 3474 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3475 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3476 Perl_pp_pushmark(aTHX);
a0d0e21e 3477
924508f0 3478 EXTEND(SP, notfound + 5);
a0d0e21e
LW
3479 PUSHs(lr>0? right: left);
3480 PUSHs(lr>0? left: right);
3280af22 3481 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3482 if (notfound) {
59cd0e26
NC
3483 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3484 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3485 }
636ac8fc
FC
3486 else if (flags & AMGf_numarg)
3487 PUSHs(&PL_sv_undef);
3488 if (flags & AMGf_numarg)
3489 PUSHs(&PL_sv_yes);
ad64d0ec 3490 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3491 PUTBACK;
67288365 3492 oldmark = TOPMARK;
a0d0e21e 3493
139d0ce6 3494 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3495 CALLRUNOPS(aTHX);
a0d0e21e
LW
3496 LEAVE;
3497 SPAGAIN;
67288365
JL
3498 nret = SP - (PL_stack_base + oldmark);
3499
3500 switch (gimme) {
3501 case G_VOID:
3502 /* returning NULL has another meaning, and we check the context
3503 * at the call site too, so this can be differentiated from the
3504 * scalar case */
3505 res = &PL_sv_undef;
3506 SP = PL_stack_base + oldmark;
3507 break;
3508 case G_ARRAY: {
3509 if (flags & AMGf_want_list) {
3510 res = sv_2mortal((SV *)newAV());
3511 av_extend((AV *)res, nret);
3512 while (nret--)
3513 av_store((AV *)res, nret, POPs);
3514 break;
3515 }
3516 /* FALLTHROUGH */
3517 }
3518 default:
3519 res = POPs;
3520 break;
3521 }
a0d0e21e 3522
ebafeae7 3523 PUTBACK;
d3acc0f7 3524 POPSTACK;
54310121 3525 CATCH_SET(oldcatch);
a0d0e21e 3526
a0d0e21e 3527 if (postpr) {
b7787f18 3528 int ans;
a0d0e21e
LW
3529 switch (method) {
3530 case le_amg:
3531 case sle_amg:
3532 ans=SvIV(res)<=0; break;
3533 case lt_amg:
3534 case slt_amg:
3535 ans=SvIV(res)<0; break;
3536 case ge_amg:
3537 case sge_amg:
3538 ans=SvIV(res)>=0; break;
3539 case gt_amg:
3540 case sgt_amg:
3541 ans=SvIV(res)>0; break;
3542 case eq_amg:
3543 case seq_amg:
3544 ans=SvIV(res)==0; break;
3545 case ne_amg:
3546 case sne_amg:
3547 ans=SvIV(res)!=0; break;
3548 case inc_amg:
3549 case dec_amg:
bbce6d69 3550 SvSetSV(left,res); return left;
dc437b57 3551 case not_amg:
fe7ac86a 3552 ans=!SvTRUE(res); break;
b7787f18
AL
3553 default:
3554 ans=0; break;
a0d0e21e 3555 }
54310121 3556 return boolSV(ans);
748a9306
LW
3557 } else if (method==copy_amg) {
3558 if (!SvROK(res)) {
cea2e8a9 3559 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
3560 }
3561 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
3562 } else {
3563 return res;
3564 }
3565 }
3566}
c9d5ac95 3567
f5c1e807
NC
3568void
3569Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3570{
3571 dVAR;
acda4c6a 3572 U32 hash;
f5c1e807 3573
7918f24d 3574 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3575
acda4c6a 3576 if (len > I32_MAX)
147e3846 3577 Perl_croak(aTHX_ "panic: gv name too long (%" UVuf ")", (UV) len);
acda4c6a 3578
ae8cc45f
NC
3579 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3580 unshare_hek(GvNAME_HEK(gv));
3581 }
3582
acda4c6a 3583 PERL_HASH(hash, name, len);
c60dbbc3 3584 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC
3585}
3586
66610fdd 3587/*
f7461760
Z
3588=for apidoc gv_try_downgrade
3589
2867cdbc
Z
3590If the typeglob C<gv> can be expressed more succinctly, by having
3591something other than a real GV in its place in the stash, replace it
3592with the optimised form. Basic requirements for this are that C<gv>
3593is a real typeglob, is sufficiently ordinary, and is only referenced
3594from its package. This function is meant to be used when a GV has been
3595looked up in part to see what was there, causing upgrading, but based
3596on what was found it turns out that the real GV isn't required after all.
3597
3598If C<gv> is a completely empty typeglob, it is deleted from the stash.
3599
3600If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3601sub, the typeglob is replaced with a scalar-reference placeholder that
3602more compactly represents the same thing.
f7461760
Z
3603
3604=cut
3605*/
3606
3607void
3608Perl_gv_try_downgrade(pTHX_ GV *gv)
3609{
3610 HV *stash;
3611 CV *cv;
3612 HEK *namehek;
3613 SV **gvp;
3614 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC
3615
3616 /* XXX Why and where does this leave dangling pointers during global
3617 destruction? */
627364f1 3618 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3619
2867cdbc 3620 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3621 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3622 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3623 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3624 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3625 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3626 return;
2be08ad1
FC
3627 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3628 return;
803f2748
DM
3629 if (SvMAGICAL(gv)) {
3630 MAGIC *mg;
3631 /* only backref magic is allowed */
3632 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))