This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
gv.c, gv_fetchpvn_flags: Split another chunk of magic-checking code.
[perl5.git] / gv.c
CommitLineData
a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW
20 */
21
ccfc67b7
JH
22/*
23=head1 GV Functions
166f8a29
DM
24
25A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
26It is a structure that holds a pointer to a scalar, an array, a hash etc,
27corresponding to $foo, @foo, %foo.
28
29GVs are usually found as values in stashes (symbol table hashes) where
30Perl stores its global variables.
31
32=cut
ccfc67b7
JH
33*/
34
79072805 35#include "EXTERN.h"
864dbfa3 36#define PERL_IN_GV_C
79072805 37#include "perl.h"
8261f8eb 38#include "overload.c"
4aaa4757 39#include "keywords.h"
2846acbf 40#include "feature.h"
79072805 41
f54cb97a
AL
42static const char S_autoload[] = "AUTOLOAD";
43static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 44
c69033f2 45GV *
d5713896 46Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 47{
d5713896 48 SV **where;
7918f24d 49
13be902c
FC
50 if (
51 !gv
52 || (
53 SvTYPE((const SV *)gv) != SVt_PVGV
54 && SvTYPE((const SV *)gv) != SVt_PVLV
55 )
56 ) {
bb85b28a
NC
57 const char *what;
58 if (type == SVt_PVIO) {
59 /*
60 * if it walks like a dirhandle, then let's assume that
61 * this is a dirhandle.
62 */
332c2eac 63 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 64 "dirhandle" : "filehandle";
bb85b28a
NC
65 } else if (type == SVt_PVHV) {
66 what = "hash";
67 } else {
68 what = type == SVt_PVAV ? "array" : "scalar";
69 }
de6f7947 70 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC
71 Perl_croak(aTHX_ "Bad symbol for %s", what);
72 }
d5713896
NC
73
74 if (type == SVt_PVHV) {
75 where = (SV **)&GvHV(gv);
76 } else if (type == SVt_PVAV) {
77 where = (SV **)&GvAV(gv);
bb85b28a
NC
78 } else if (type == SVt_PVIO) {
79 where = (SV **)&GvIOp(gv);
d5713896
NC
80 } else {
81 where = &GvSV(gv);
82 }
7918f24d 83
d5713896
NC
84 if (!*where)
85 *where = newSV_type(type);
986d39ee
FC
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
79072805
LW
89 return gv;
90}
91
92GV *
864dbfa3 93Perl_gv_fetchfile(pTHX_ const char *name)
79072805 94{
7918f24d 95 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC
96 return gv_fetchfile_flags(name, strlen(name), 0);
97}
98
99GV *
100Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
101 const U32 flags)
102{
97aff369 103 dVAR;
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW
107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC
110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS
116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS
120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC
122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
5a9a79a4
FC
132 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
133 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
53d95988
CS
134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW
136 return gv;
137}
138
62d55b22
NC
139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
145NULL.
146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d
NC
153 PERL_ARGS_ASSERT_GV_CONST_SV;
154
62d55b22
NC
155 if (SvTYPE(gv) == SVt_PVGV)
156 return cv_const_sv(GvCVu(gv));
6f1b3ab0 157 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
62d55b22
NC
158}
159
12816592
NC
160GP *
161Perl_newGP(pTHX_ GV *const gv)
162{
163 GP *gp;
19bad673 164 U32 hash;
19bad673
NC
165 const char *file;
166 STRLEN len;
2639089b 167#ifndef USE_ITHREADS
6b352265 168 GV *filegv;
2639089b 169#endif
c2587955 170 dVAR;
19bad673 171
7918f24d 172 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD
173 Newxz(gp, 1, GP);
174 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
175#ifndef PERL_DONT_CREATE_GVSV
176 gp->gp_sv = newSV(0);
177#endif
7918f24d 178
f5d98eaa
FC
179 /* PL_curcop should never be null here. */
180 assert(PL_curcop);
181 /* But for non-debugging builds play it safe */
2639089b
DD
182 if (PL_curcop) {
183 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 184#ifdef USE_ITHREADS
2639089b
DD
185 if (CopFILE(PL_curcop)) {
186 file = CopFILE(PL_curcop);
187 len = strlen(file);
188 }
2639089b 189#else
cb0d3385
FC
190 filegv = CopFILEGV(PL_curcop);
191 if (filegv) {
192 file = GvNAME(filegv)+2;
193 len = GvNAMELEN(filegv)-2;
194 }
6e314d4f 195#endif
cb0d3385
FC
196 else goto no_file;
197 }
198 else {
199 no_file:
19bad673
NC
200 file = "";
201 len = 0;
202 }
f4890806
NC
203
204 PERL_HASH(hash, file, len);
f4890806 205 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC
206 gp->gp_refcnt = 1;
207
208 return gp;
209}
210
803f2748
DM
211/* Assign CvGV(cv) = gv, handling weak references.
212 * See also S_anonymise_cv_maybe */
213
214void
215Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
216{
217 GV * const oldgv = CvGV(cv);
b290562e 218 HEK *hek;
803f2748
DM
219 PERL_ARGS_ASSERT_CVGV_SET;
220
221 if (oldgv == gv)
222 return;
223
224 if (oldgv) {
cfc1e951 225 if (CvCVGV_RC(cv)) {
e7881358 226 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM
227 CvCVGV_RC_off(cv);
228 }
803f2748 229 else {
803f2748
DM
230 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
231 }
232 }
b290562e 233 else if ((hek = CvNAME_HEK(cv))) unshare_hek(hek);
803f2748 234
b290562e 235 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 236 assert(!CvCVGV_RC(cv));
803f2748
DM
237
238 if (!gv)
239 return;
240
c794ca97
DM
241 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
242 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
243 else {
cfc1e951 244 CvCVGV_RC_on(cv);
803f2748
DM
245 SvREFCNT_inc_simple_void_NN(gv);
246 }
803f2748
DM
247}
248
c68d9564
Z
249/* Assign CvSTASH(cv) = st, handling weak references. */
250
251void
252Perl_cvstash_set(pTHX_ CV *cv, HV *st)
253{
254 HV *oldst = CvSTASH(cv);
255 PERL_ARGS_ASSERT_CVSTASH_SET;
256 if (oldst == st)
257 return;
258 if (oldst)
259 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
260 SvANY(cv)->xcv_stash = st;
261 if (st)
262 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
263}
803f2748 264
e1104062
FC
265/*
266=for apidoc gv_init_pvn
267
268Converts a scalar into a typeglob. This is an incoercible typeglob;
269assigning a reference to it will assign to one of its slots, instead of
270overwriting it as happens with typeglobs created by SvSetSV. Converting
271any scalar that is SvOK() may produce unpredictable results and is reserved
272for perl's internal use.
273
274C<gv> is the scalar to be converted.
275
276C<stash> is the parent stash/package, if any.
277
04ec7e59
FC
278C<name> and C<len> give the name. The name must be unqualified;
279that is, it must not include the package name. If C<gv> is a
e1104062
FC
280stash element, it is the caller's responsibility to ensure that the name
281passed to this function matches the name of the element. If it does not
282match, perl's internal bookkeeping will get out of sync.
283
04ec7e59
FC
284C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
285the return value of SvUTF8(sv). It can also take the
286GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC
287seen before (i.e., suppress "Used once" warnings).
288
289=for apidoc gv_init
290
291The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC
292has no flags parameter. If the C<multi> parameter is set, the
293GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC
294
295=for apidoc gv_init_pv
296
297Same as gv_init_pvn(), but takes a nul-terminated string for the name
298instead of separate char * and length parameters.
299
300=for apidoc gv_init_sv
301
302Same as gv_init_pvn(), but takes an SV * for the name instead of separate
303char * and length parameters. C<flags> is currently unused.
304
305=cut
306*/
307
463ee0b2 308void
04ec7e59 309Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF
310{
311 char *namepv;
312 STRLEN namelen;
313 PERL_ARGS_ASSERT_GV_INIT_SV;
314 namepv = SvPV(namesv, namelen);
315 if (SvUTF8(namesv))
316 flags |= SVf_UTF8;
04ec7e59 317 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF
318}
319
320void
04ec7e59 321Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF
322{
323 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 324 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF
325}
326
327void
04ec7e59 328Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 329{
27da23d5 330 dVAR;
3b6733bf
NC
331 const U32 old_type = SvTYPE(gv);
332 const bool doproto = old_type > SVt_NULL;
f9509170 333 char * const proto = (doproto && SvPOK(gv))
dad95a0a 334 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 335 : NULL;
49a54bbe 336 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 337 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 338 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 339 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 340
e6066781 341 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC
342 assert (!(proto && has_constant));
343
344 if (has_constant) {
5c1f4d79
NC
345 /* The constant has to be a simple scalar type. */
346 switch (SvTYPE(has_constant)) {
5c1f4d79
NC
347 case SVt_PVHV:
348 case SVt_PVCV:
349 case SVt_PVFM:
350 case SVt_PVIO:
351 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
352 sv_reftype(has_constant, 0));
42d0e0b7 353 default: NOOP;
5c1f4d79 354 }
756cb477
NC
355 SvRV_set(gv, NULL);
356 SvROK_off(gv);
357 }
463ee0b2 358
3b6733bf
NC
359
360 if (old_type < SVt_PVGV) {
361 if (old_type >= SVt_PV)
362 SvCUR_set(gv, 0);
ad64d0ec 363 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 364 }
55d729e4
GS
365 if (SvLEN(gv)) {
366 if (proto) {
f880fe2f 367 SvPV_set(gv, NULL);
b162af07 368 SvLEN_set(gv, 0);
55d729e4
GS
369 SvPOK_off(gv);
370 } else
94010e71 371 Safefree(SvPVX_mutable(gv));
55d729e4 372 }
2e5b91de
NC
373 SvIOK_off(gv);
374 isGV_with_GP_on(gv);
12816592 375
c43ae56f 376 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC
377 GvSTASH(gv) = stash;
378 if (stash)
ad64d0ec 379 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 380 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC
381 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
382 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 383 if (doproto) {
e3d2b9e7 384 CV *cv;
756cb477
NC
385 if (has_constant) {
386 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 387 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC
388 /* In case op.c:S_process_special_blocks stole it: */
389 if (!GvCV(gv))
c43ae56f 390 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 391 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC
392 /* If this reference was a copy of another, then the subroutine
393 must have been "imported", by a Perl space assignment to a GV
394 from a reference to CV. */
395 if (exported_constant)
396 GvIMPORTED_CV_on(gv);
186a5ba8 397 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 398 } else {
186a5ba8 399 cv = newSTUB(gv,1);
756cb477 400 }
55d729e4 401 if (proto) {
e3d2b9e7 402 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 403 SV_HAS_TRAILING_NUL);
e0260a5b 404 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS
405 }
406 }
463ee0b2
LW
407}
408
76e3520e 409STATIC void
e6066781 410S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 411{
e6066781 412 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 413
a0d0e21e
LW
414 switch (sv_type) {
415 case SVt_PVIO:
416 (void)GvIOn(gv);
417 break;
418 case SVt_PVAV:
419 (void)GvAVn(gv);
420 break;
421 case SVt_PVHV:
422 (void)GvHVn(gv);
423 break;
c69033f2
NC
424#ifdef PERL_DONT_CREATE_GVSV
425 case SVt_NULL:
426 case SVt_PVCV:
427 case SVt_PVFM:
e654831b 428 case SVt_PVGV:
c69033f2
NC
429 break;
430 default:
dbdce04c
NC
431 if(GvSVn(gv)) {
432 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
433 If we just cast GvSVn(gv) to void, it ignores evaluating it for
434 its side effect */
435 }
c69033f2 436#endif
a0d0e21e
LW
437 }
438}
439
0f8d4b5e
FC
440static void core_xsub(pTHX_ CV* cv);
441
442static GV *
443S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 444 const char * const name, const STRLEN len)
0f8d4b5e
FC
445{
446 const int code = keyword(name, len, 1);
447 static const char file[] = __FILE__;
97021f77 448 CV *cv, *oldcompcv = NULL;
0f8d4b5e 449 int opnum = 0;
0f8d4b5e 450 bool ampable = TRUE; /* &{}-able */
97021f77
FC
451 COP *oldcurcop = NULL;
452 yy_parser *oldparser = NULL;
453 I32 oldsavestack_ix = 0;
0f8d4b5e
FC
454
455 assert(gv || stash);
456 assert(name);
0f8d4b5e 457
88b892d8
FC
458 if (!code) return NULL; /* Not a keyword */
459 switch (code < 0 ? -code : code) {
0f8d4b5e 460 /* no support for \&CORE::infix;
d885f758 461 no support for funcs that do not parse like funcs */
88b892d8
FC
462 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
463 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp: case KEY_CORE :
eb31eb35 464 case KEY_default : case KEY_DESTROY:
88b892d8 465 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 466 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 467 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 468 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC
469 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
470 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
471 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 472 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 473 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 474 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 475 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 476 case KEY_state: case KEY_sub :
46bef06f 477 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC
478 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
479 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC
480 return NULL;
481 case KEY_chdir:
eb31eb35 482 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 483 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC
484 case KEY_keys:
485 case KEY_lstat:
486 case KEY_pop:
487 case KEY_push:
488 case KEY_shift:
a99f2ca2 489 case KEY_splice: case KEY_split:
0f8d4b5e
FC
490 case KEY_stat:
491 case KEY_system:
492 case KEY_truncate: case KEY_unlink:
493 case KEY_unshift:
494 case KEY_values:
495 ampable = FALSE;
496 }
497 if (!gv) {
498 gv = (GV *)newSV(0);
499 gv_init(gv, stash, name, len, TRUE);
500 }
7e68c38b 501 GvMULTI_on(gv);
0f8d4b5e
FC
502 if (ampable) {
503 ENTER;
504 oldcurcop = PL_curcop;
505 oldparser = PL_parser;
506 lex_start(NULL, NULL, 0);
507 oldcompcv = PL_compcv;
508 PL_compcv = NULL; /* Prevent start_subparse from setting
509 CvOUTSIDE. */
510 oldsavestack_ix = start_subparse(FALSE,0);
511 cv = PL_compcv;
512 }
513 else {
514 /* Avoid calling newXS, as it calls us, and things start to
515 get hairy. */
516 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
517 GvCV_set(gv,cv);
518 GvCVGEN(gv) = 0;
519 mro_method_changed_in(GvSTASH(gv));
520 CvISXSUB_on(cv);
521 CvXSUB(cv) = core_xsub;
522 }
523 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
524 from PL_curcop. */
525 (void)gv_fetchfile(file);
526 CvFILE(cv) = (char *)file;
527 /* XXX This is inefficient, as doing things this order causes
528 a prototype check in newATTRSUB. But we have to do
529 it this order as we need an op number before calling
530 new ATTRSUB. */
531 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 532 if (stash)
73c02f15 533 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 534 if (ampable) {
4428fb0e
TC
535#ifdef DEBUGGING
536 CV *orig_cv = cv;
537#endif
0f8d4b5e 538 CvLVALUE_on(cv);
4428fb0e
TC
539 /* newATTRSUB will free the CV and return NULL if we're still
540 compiling after a syntax error */
541 if ((cv = newATTRSUB_flags(
7e68c38b 542 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC
543 NULL,NULL,
544 coresub_op(
545 opnum
546 ? newSVuv((UV)opnum)
547 : newSVpvn(name,len),
548 code, opnum
7e68c38b
FC
549 ),
550 1
4428fb0e
TC
551 )) != NULL) {
552 assert(GvCV(gv) == orig_cv);
553 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
554 && opnum != OP_UNDEF)
555 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
556 }
0f8d4b5e
FC
557 LEAVE;
558 PL_parser = oldparser;
559 PL_curcop = oldcurcop;
560 PL_compcv = oldcompcv;
561 }
4428fb0e
TC
562 if (cv) {
563 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
564 cv_set_call_checker(
565 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
566 );
567 SvREFCNT_dec(opnumsv);
568 }
569
0f8d4b5e
FC
570 return gv;
571}
572
954c1994 573/*
6c53d59b
FC
574=for apidoc gv_fetchmeth
575
576Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
577
e6919483
BF
578=for apidoc gv_fetchmeth_sv
579
580Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
581of an SV instead of a string/length pair.
582
583=cut
584*/
585
586GV *
587Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
588{
589 char *namepv;
590 STRLEN namelen;
591 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
592 namepv = SvPV(namesv, namelen);
593 if (SvUTF8(namesv))
594 flags |= SVf_UTF8;
595 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
596}
597
598/*
599=for apidoc gv_fetchmeth_pv
600
601Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
602instead of a string/length pair.
603
604=cut
605*/
606
607GV *
608Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
609{
610 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
611 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
612}
613
614/*
615=for apidoc gv_fetchmeth_pvn
954c1994
GS
616
617Returns the glob with the given C<name> and a defined subroutine or
618C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 619accessible via @ISA and UNIVERSAL::.
954c1994
GS
620
621The argument C<level> should be either 0 or -1. If C<level==0>, as a
622side-effect creates a glob with the given C<name> in the given C<stash>
623which in the case of success contains an alias for the subroutine, and sets
e1a479c5 624up caching info for this glob.
954c1994 625
aae43805
FC
626The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
627
628GV_SUPER indicates that we want to look up the method in the superclasses
629of the C<stash>.
e6919483 630
aae43805 631The
954c1994 632GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 633visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 634the GV directly; instead, you should use the method's CV, which can be
b267980d 635obtained from the GV with the C<GvCV> macro.
954c1994
GS
636
637=cut
638*/
639
e1a479c5
BB
640/* NOTE: No support for tied ISA */
641
79072805 642GV *
e6919483 643Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 644{
97aff369 645 dVAR;
463ee0b2 646 GV** gvp;
e1a479c5
BB
647 AV* linear_av;
648 SV** linear_svp;
649 SV* linear_sv;
aae43805 650 HV* cstash, *cachestash;
e1a479c5
BB
651 GV* candidate = NULL;
652 CV* cand_cv = NULL;
e1a479c5 653 GV* topgv = NULL;
bfcb3514 654 const char *hvname;
e1a479c5
BB
655 I32 create = (level >= 0) ? 1 : 0;
656 I32 items;
e1a479c5 657 U32 topgen_cmp;
04f3bf56 658 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 659
e6919483 660 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 661
af09ea45
IK
662 /* UNIVERSAL methods should be callable without a stash */
663 if (!stash) {
e1a479c5 664 create = 0; /* probably appropriate */
da51bb9b 665 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK
666 return 0;
667 }
668
e1a479c5
BB
669 assert(stash);
670
bfcb3514
NC
671 hvname = HvNAME_get(stash);
672 if (!hvname)
e1a479c5 673 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 674
e1a479c5
BB
675 assert(hvname);
676 assert(name);
463ee0b2 677
aae43805
FC
678 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
679 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
44a8e56a 680
dd69841b 681 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 682
aae43805 683 if (flags & GV_SUPER) {
1a33a059
FC
684 if (!HvAUX(stash)->xhv_mro_meta->super)
685 HvAUX(stash)->xhv_mro_meta->super = newHV();
686 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC
687 }
688 else cachestash = stash;
689
e1a479c5 690 /* check locally for a real method or a cache entry */
aae43805
FC
691 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
692 create);
e1a479c5
BB
693 if(gvp) {
694 topgv = *gvp;
0f8d4b5e 695 have_gv:
e1a479c5
BB
696 assert(topgv);
697 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 698 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
699 if ((cand_cv = GvCV(topgv))) {
700 /* If genuine method or valid cache entry, use it */
701 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
702 return topgv;
703 }
704 else {
705 /* stale cache entry, junk it and move on */
e7881358 706 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM
707 GvCV_set(topgv, NULL);
708 cand_cv = NULL;
e1a479c5
BB
709 GvCVGEN(topgv) = 0;
710 }
711 }
712 else if (GvCVGEN(topgv) == topgen_cmp) {
713 /* cache indicates no such method definitively */
714 return 0;
715 }
aae43805
FC
716 else if (stash == cachestash
717 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 718 && strnEQ(hvname, "CORE", 4)
87566176 719 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 720 goto have_gv;
463ee0b2 721 }
79072805 722
aae43805 723 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB
724 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
725 items = AvFILLp(linear_av); /* no +1, to skip over self */
726 while (items--) {
727 linear_sv = *linear_svp++;
728 assert(linear_sv);
729 cstash = gv_stashsv(linear_sv, 0);
730
dd69841b 731 if (!cstash) {
ecad31f0 732 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 733 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 734 SVfARG(linear_sv),
d0c0e7dd 735 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB
736 continue;
737 }
9607fc9c 738
e1a479c5
BB
739 assert(cstash);
740
c60dbbc3 741 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC
742 if (!gvp) {
743 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
744 const char *hvname = HvNAME(cstash); assert(hvname);
745 if (strnEQ(hvname, "CORE", 4)
746 && (candidate =
87566176 747 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC
748 ))
749 goto have_candidate;
750 }
751 continue;
752 }
753 else candidate = *gvp;
754 have_candidate:
e1a479c5 755 assert(candidate);
04f3bf56 756 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 757 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
758 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
759 /*
760 * Found real method, cache method in topgv if:
761 * 1. topgv has no synonyms (else inheritance crosses wires)
762 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
763 */
764 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
765 CV *old_cv = GvCV(topgv);
766 SvREFCNT_dec(old_cv);
e1a479c5 767 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 768 GvCV_set(topgv, cand_cv);
e1a479c5
BB
769 GvCVGEN(topgv) = topgen_cmp;
770 }
771 return candidate;
772 }
773 }
9607fc9c 774
e1a479c5
BB
775 /* Check UNIVERSAL without caching */
776 if(level == 0 || level == -1) {
aae43805 777 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
e1a479c5
BB
778 if(candidate) {
779 cand_cv = GvCV(candidate);
780 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
781 CV *old_cv = GvCV(topgv);
782 SvREFCNT_dec(old_cv);
e1a479c5 783 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 784 GvCV_set(topgv, cand_cv);
e1a479c5
BB
785 GvCVGEN(topgv) = topgen_cmp;
786 }
787 return candidate;
788 }
789 }
790
791 if (topgv && GvREFCNT(topgv) == 1) {
792 /* cache the fact that the method is not defined */
793 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW
794 }
795
79072805
LW
796 return 0;
797}
798
954c1994 799/*
460e5730
FC
800=for apidoc gv_fetchmeth_autoload
801
802This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
803parameter.
804
d21989ed 805=for apidoc gv_fetchmeth_sv_autoload
611c1e95 806
d21989ed
BF
807Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
808of an SV instead of a string/length pair.
809
810=cut
811*/
812
813GV *
814Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
815{
816 char *namepv;
817 STRLEN namelen;
818 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
819 namepv = SvPV(namesv, namelen);
820 if (SvUTF8(namesv))
821 flags |= SVf_UTF8;
822 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
823}
824
825/*
826=for apidoc gv_fetchmeth_pv_autoload
827
828Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
829instead of a string/length pair.
830
831=cut
832*/
833
834GV *
835Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
836{
837 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
838 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
839}
840
841/*
842=for apidoc gv_fetchmeth_pvn_autoload
843
844Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ
845Returns a glob for the subroutine.
846
847For an autoloaded subroutine without a GV, will create a GV even
848if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
849of the result may be zero.
850
d21989ed
BF
851Currently, the only significant value for C<flags> is SVf_UTF8.
852
611c1e95
IZ
853=cut
854*/
855
856GV *
d21989ed 857Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 858{
499321d3 859 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 860
d21989ed 861 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 862
611c1e95 863 if (!gv) {
611c1e95
IZ
864 CV *cv;
865 GV **gvp;
866
867 if (!stash)
6136c704 868 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 869 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 870 return NULL;
d21989ed 871 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 872 return NULL;
611c1e95
IZ
873 cv = GvCV(gv);
874 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 875 return NULL;
611c1e95
IZ
876 /* Have an autoload */
877 if (level < 0) /* Cannot do without a stub */
d21989ed 878 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF
879 gvp = (GV**)hv_fetch(stash, name,
880 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 881 if (!gvp)
6136c704 882 return NULL;
611c1e95
IZ
883 return *gvp;
884 }
885 return gv;
886}
887
888/*
954c1994
GS
889=for apidoc gv_fetchmethod_autoload
890
891Returns the glob which contains the subroutine to call to invoke the method
892on the C<stash>. In fact in the presence of autoloading this may be the
893glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 894already setup.
954c1994
GS
895
896The third parameter of C<gv_fetchmethod_autoload> determines whether
897AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 898means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 899Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 900with a non-zero C<autoload> parameter.
954c1994
GS
901
902These functions grant C<"SUPER"> token as a prefix of the method name. Note
903that if you want to keep the returned glob for a long time, you need to
904check for it being "AUTOLOAD", since at the later time the call may load a
905different subroutine due to $AUTOLOAD changing its value. Use the glob
b267980d 906created via a side effect to do this.
954c1994
GS
907
908These functions have the same side-effects and as C<gv_fetchmeth> with
909C<level==0>. C<name> should be writable if contains C<':'> or C<'
910''>. The warning against passing the GV returned by C<gv_fetchmeth> to
b267980d 911C<call_sv> apply equally to these functions.
954c1994
GS
912
913=cut
914*/
915
dc848c6f 916GV *
864dbfa3 917Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 918{
547bb267
NC
919 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
920
256d1bb2
NC
921 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
922}
923
44130a26
BF
924GV *
925Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
926{
927 char *namepv;
928 STRLEN namelen;
929 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
930 namepv = SvPV(namesv, namelen);
931 if (SvUTF8(namesv))
932 flags |= SVf_UTF8;
933 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
934}
935
936GV *
937Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
938{
939 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
940 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
941}
942
256d1bb2
NC
943/* Don't merge this yet, as it's likely to get a len parameter, and possibly
944 even a U32 hash */
945GV *
44130a26 946Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 947{
97aff369 948 dVAR;
eb578fdb 949 const char *nend;
c445ea15 950 const char *nsplit = NULL;
a0d0e21e 951 GV* gv;
0dae17bd 952 HV* ostash = stash;
c94593d0 953 const char * const origname = name;
ad64d0ec 954 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
955 const U32 autoload = flags & GV_AUTOLOAD;
956 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 957 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 958
44130a26 959 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 960
eff494dd 961 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 962 stash = NULL;
c9bf4021
NC
963 else {
964 /* The only way stash can become NULL later on is if nsplit is set,
965 which in turn means that there is no need for a SVt_PVHV case
966 the error reporting code. */
967 }
b267980d 968
44130a26 969 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 970 if (*nend == '\'') {
a0d0e21e 971 nsplit = nend;
c94593d0
NC
972 name = nend + 1;
973 }
974 else if (*nend == ':' && *(nend + 1) == ':') {
975 nsplit = nend++;
976 name = nend + 1;
977 }
a0d0e21e
LW
978 }
979 if (nsplit) {
7edbdc6b 980 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 981 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC
982 stash = CopSTASH(PL_curcop);
983 flags |= GV_SUPER;
cea2e8a9 984 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 985 origname, HvENAME_get(stash), name) );
4633a7c4 986 }
aae43805
FC
987 else if ((nsplit - origname) >= 7 &&
988 strnEQ(nsplit - 7, "::SUPER", 7)) {
989 /* don't autovifify if ->NoSuchStash::SUPER::method */
990 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
991 if (stash) flags |= GV_SUPER;
992 }
e189a56d 993 else {
af09ea45 994 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 995 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 996 }
0dae17bd 997 ostash = stash;
4633a7c4
LW
998 }
999
14d1dfbd 1000 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1001 if (!gv) {
2f6e0fe7 1002 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1003 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1004 else if (autoload)
c8416c26
BF
1005 gv = gv_autoload_pvn(
1006 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1007 );
256d1bb2
NC
1008 if (!gv && do_croak) {
1009 /* Right now this is exclusively for the benefit of S_method_common
1010 in pp_hot.c */
1011 if (stash) {
15e6cdd9
DG
1012 /* If we can't find an IO::File method, it might be a call on
1013 * a filehandle. If IO:File has not been loaded, try to
1014 * require it first instead of croaking */
1015 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1016 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1017 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1018 STR_WITH_LEN("IO/File.pm"), 0,
1019 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1020 ) {
31b05a0f 1021 require_pv("IO/File.pm");
14d1dfbd 1022 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG
1023 if (gv)
1024 return gv;
1025 }
256d1bb2 1026 Perl_croak(aTHX_
b17a0679 1027 "Can't locate object method \"%"UTF8f
d0c0e7dd 1028 "\" via package \"%"HEKf"\"",
b17a0679 1029 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1030 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC
1031 }
1032 else {
ecad31f0 1033 SV* packnamesv;
256d1bb2 1034
256d1bb2 1035 if (nsplit) {
ecad31f0
BF
1036 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1037 SVs_TEMP | is_utf8);
256d1bb2 1038 } else {
017c5e4e 1039 packnamesv = error_report;
256d1bb2
NC
1040 }
1041
1042 Perl_croak(aTHX_
b17a0679
FC
1043 "Can't locate object method \"%"UTF8f
1044 "\" via package \"%"SVf"\""
ecad31f0 1045 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1046 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1047 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1048 }
1049 }
463ee0b2 1050 }
dc848c6f 1051 else if (autoload) {
9d4ba2ae 1052 CV* const cv = GvCV(gv);
09280a33
CS
1053 if (!CvROOT(cv) && !CvXSUB(cv)) {
1054 GV* stubgv;
1055 GV* autogv;
1056
1057 if (CvANON(cv))
1058 stubgv = gv;
1059 else {
1060 stubgv = CvGV(cv);
1061 if (GvCV(stubgv) != cv) /* orphaned import */
1062 stubgv = gv;
1063 }
c8416c26
BF
1064 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1065 GvNAME(stubgv), GvNAMELEN(stubgv),
1066 GV_AUTOLOAD_ISMETHOD
1067 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1068 if (autogv)
1069 gv = autogv;
1070 }
1071 }
44a8e56a
PP
1072
1073 return gv;
1074}
1075
1076GV*
0eeb01b9 1077Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1078{
1079 char *namepv;
1080 STRLEN namelen;
0fe84f7c 1081 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1082 namepv = SvPV(namesv, namelen);
1083 if (SvUTF8(namesv))
1084 flags |= SVf_UTF8;
0eeb01b9 1085 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1086}
1087
1088GV*
0eeb01b9 1089Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1090{
0fe84f7c 1091 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1092 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1093}
1094
1095GV*
0eeb01b9 1096Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1097{
27da23d5 1098 dVAR;
44a8e56a
PP
1099 GV* gv;
1100 CV* cv;
1101 HV* varstash;
1102 GV* vargv;
1103 SV* varsv;
c8416c26
BF
1104 SV *packname = NULL;
1105 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1106
0fe84f7c 1107 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1108
7edbdc6b 1109 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1110 return NULL;
0dae17bd
GS
1111 if (stash) {
1112 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1113 STRLEN packname_len = 0;
1114 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1115 packname = newSVpvn_flags(packname_ptr, packname_len,
1116 SVs_TEMP | SvUTF8(stash));
5c284bb0 1117 stash = NULL;
0dae17bd 1118 }
c8416c26
BF
1119 else
1120 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1121 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1122 }
c8416c26 1123 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, is_utf8)))
a0714e2c 1124 return NULL;
dc848c6f
PP
1125 cv = GvCV(gv);
1126
adb5a9ae 1127 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1128 return NULL;
ed850460 1129
dc848c6f
PP
1130 /*
1131 * Inheriting AUTOLOAD for non-methods works ... for now.
1132 */
0eeb01b9
FC
1133 if (
1134 !(flags & GV_AUTOLOAD_ISMETHOD)
1135 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1136 )
d1d15184 1137 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC
1138 "Use of inherited AUTOLOAD for non-method %"SVf
1139 "::%"UTF8f"() is deprecated",
ecad31f0 1140 SVfARG(packname),
b17a0679 1141 UTF8fARG(is_utf8, len, name));
44a8e56a 1142
aed2304a 1143 if (CvISXSUB(cv)) {
bb619f37
FC
1144 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1145 * and split that value on the last '::', pass along the same data
1146 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC
1147 *
1148 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1149 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC
1150 * type. Since SvPVX has been documented as returning the sub name
1151 * for a long time, but not as returning the prototype, we have
1152 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1153 * elsewhere.
1154 *
1155 * We put the prototype in the same allocated buffer, but after
1156 * the sub name. The SvPOK flag indicates the presence of a proto-
1157 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1158 * If both flags are on, then SvLEN is used to indicate the end of
1159 * the prototype (artificially lower than what is actually allo-
1160 * cated), at the risk of having to reallocate a few bytes unneces-
1161 * sarily--but that should happen very rarely, if ever.
1162 *
1163 * We use SvUTF8 for both prototypes and sub names, so if one is
1164 * UTF8, the other must be upgraded.
adb5a9ae 1165 */
c68d9564 1166 CvSTASH_set(cv, stash);
8fa6a409 1167 if (SvPOK(cv)) { /* Ouch! */
e7881358 1168 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC
1169 STRLEN ulen;
1170 const char *proto = CvPROTO(cv);
1171 assert(proto);
1172 if (SvUTF8(cv))
1173 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1174 ulen = SvCUR(tmpsv);
1175 SvCUR(tmpsv)++; /* include null in string */
1176 sv_catpvn_flags(
1177 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1178 );
1179 SvTEMP_on(tmpsv); /* Allow theft */
1180 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1181 SvTEMP_off(tmpsv);
e7881358 1182 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC
1183 SvLEN(cv) = SvCUR(cv) + 1;
1184 SvCUR(cv) = ulen;
1185 }
1186 else {
1187 sv_setpvn((SV *)cv, name, len);
1188 SvPOK_off(cv);
1189 if (is_utf8)
c8416c26 1190 SvUTF8_on(cv);
8fa6a409
FC
1191 else SvUTF8_off(cv);
1192 }
1193 CvAUTOLOAD_on(cv);
adb5a9ae 1194 }
adb5a9ae 1195
44a8e56a
PP
1196 /*
1197 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1198 * The subroutine's original name may not be "AUTOLOAD", so we don't
1199 * use that, but for lack of anything better we will use the sub's
1200 * original package to look up $AUTOLOAD.
1201 */
1202 varstash = GvSTASH(CvGV(cv));
5c7983e5 1203 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1204 ENTER;
1205
c69033f2 1206 if (!isGV(vargv)) {
04ec7e59 1207 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1208#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1209 GvSV(vargv) = newSV(0);
c69033f2
NC
1210#endif
1211 }
3d35f11b 1212 LEAVE;
e203899d 1213 varsv = GvSVn(vargv);
4bac9ae4
CS
1214 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1215 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1216 sv_setsv(varsv, packname);
396482e1 1217 sv_catpvs(varsv, "::");
d40bf27b
NC
1218 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1219 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC
1220 sv_catpvn_flags(
1221 varsv, name, len,
5bcd1ef4 1222 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1223 );
c8416c26
BF
1224 if (is_utf8)
1225 SvUTF8_on(varsv);
a0d0e21e
LW
1226 return gv;
1227}
1228
44a2ac75
YO
1229
1230/* require_tie_mod() internal routine for requiring a module
486ec47a 1231 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO
1232 *
1233 * The "gv" parameter should be the glob.
45cbc99a
RGS
1234 * "varpv" holds the name of the var, used for error messages.
1235 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1236 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS
1237 * are working reasonably close to as expected.
1238 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1239 * For the protection of $! to work (it is set by this routine)
1240 * the sv slot must already be magicalized.
d2c93421 1241 */
44a2ac75
YO
1242STATIC HV*
1243S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1244{
27da23d5 1245 dVAR;
da51bb9b 1246 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1247
7918f24d
NC
1248 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1249
0ea03996 1250 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS
1251 SV *module = newSVsv(namesv);
1252 char varname = *varpv; /* varpv might be clobbered by load_module,
1253 so save it. For the moment it's always
1254 a single char. */
b82b06b8 1255 const char type = varname == '[' ? '$' : '%';
d2c93421 1256 dSP;
d2c93421 1257 ENTER;
600beb2e 1258 SAVEFREESV(namesv);
44a2ac75 1259 if ( flags & 1 )
45cbc99a 1260 save_scalar(gv);
cac54379 1261 PUSHSTACKi(PERLSI_MAGIC);
45cbc99a 1262 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
cac54379 1263 POPSTACK;
da51bb9b 1264 stash = gv_stashsv(namesv, 0);
44a2ac75 1265 if (!stash)
b82b06b8
FC
1266 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1267 type, varname, SVfARG(namesv));
45cbc99a 1268 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC
1269 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1270 type, varname, SVfARG(namesv), methpv);
600beb2e 1271 LEAVE;
d2c93421 1272 }
e7881358 1273 else SvREFCNT_dec_NN(namesv);
44a2ac75 1274 return stash;
d2c93421
RH
1275}
1276
954c1994
GS
1277/*
1278=for apidoc gv_stashpv
1279
da51bb9b 1280Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1281determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1282
1283=cut
1284*/
1285
a0d0e21e 1286HV*
864dbfa3 1287Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1288{
7918f24d 1289 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1290 return gv_stashpvn(name, strlen(name), create);
1291}
1292
bc96cb06
SH
1293/*
1294=for apidoc gv_stashpvn
1295
da51bb9b
NC
1296Returns a pointer to the stash for a specified package. The C<namelen>
1297parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1298to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1299created if it does not already exist. If the package does not exist and
1300C<flags> is 0 (or any other setting that does not create packages) then NULL
1301is returned.
1302
566a4718
YO
1303Flags may be one of:
1304
1305 GV_ADD
1306 SVf_UTF8
1307 GV_NOADD_NOINIT
1308 GV_NOINIT
1309 GV_NOEXPAND
1310 GV_ADDMG
1311
1312The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06
SH
1313
1314=cut
1315*/
1316
dc437b57 1317HV*
da51bb9b 1318Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1319{
0cea0058 1320 char smallbuf[128];
46fc3d4c 1321 char *tmpbuf;
a0d0e21e
LW
1322 HV *stash;
1323 GV *tmpgv;
add0ecde 1324 U32 tmplen = namelen + 2;
dc437b57 1325
7918f24d
NC
1326 PERL_ARGS_ASSERT_GV_STASHPVN;
1327
add0ecde 1328 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1329 tmpbuf = smallbuf;
1330 else
add0ecde
VP
1331 Newx(tmpbuf, tmplen, char);
1332 Copy(name, tmpbuf, namelen, char);
1333 tmpbuf[namelen] = ':';
1334 tmpbuf[namelen+1] = ':';
1335 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1336 if (tmpbuf != smallbuf)
1337 Safefree(tmpbuf);
a0d0e21e 1338 if (!tmpgv)
da51bb9b 1339 return NULL;
a0d0e21e 1340 stash = GvHV(tmpgv);
1f656fcf 1341 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1342 assert(stash);
1f656fcf 1343 if (!HvNAME_get(stash)) {
0be4d16f 1344 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1345
1346 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1347 /* If the containing stash has multiple effective
1348 names, see that this one gets them, too. */
1349 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1350 mro_package_moved(stash, NULL, tmpgv, 1);
1351 }
a0d0e21e 1352 return stash;
463ee0b2
LW
1353}
1354
954c1994
GS
1355/*
1356=for apidoc gv_stashsv
1357
da51bb9b 1358Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994
GS
1359
1360=cut
1361*/
1362
a0d0e21e 1363HV*
da51bb9b 1364Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1365{
dc437b57 1366 STRLEN len;
9d4ba2ae 1367 const char * const ptr = SvPV_const(sv,len);
7918f24d
NC
1368
1369 PERL_ARGS_ASSERT_GV_STASHSV;
1370
0be4d16f 1371 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
a0d0e21e
LW
1372}
1373
1374
463ee0b2 1375GV *
fe9845cc 1376Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1377 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1378 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1379}
1380
1381GV *
fe9845cc 1382Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1383 STRLEN len;
77cb3b01
FC
1384 const char * const nambeg =
1385 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1386 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1387 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1388}
1389
90aeefb4 1390PERL_STATIC_INLINE void
290a1700 1391S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1392{
1393 AV* av;
1394
1395 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1396
1397 av = GvAVn(gv);
1398 GvMULTI_on(gv);
1399 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1400 NULL, 0);
ad7cce9f
FR
1401}
1402
90aeefb4
BF
1403/* This function grabs name and tries to split a stash and glob
1404 * from its contents. TODO better description, comments
1405 *
1406 * If the function returns TRUE and 'name == name_end', then
1407 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1408 */
1409PERL_STATIC_INLINE bool
1410S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1411 STRLEN *len, const char *nambeg, STRLEN full_len,
1412 const U32 is_utf8, const I32 add)
1413{
1414 const char *name_cursor;
1415 const char *const name_end = nambeg + full_len;
1416 const char *const name_em1 = name_end - 1;
1417
1418 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1419
1420 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1421 /* accidental stringify on a GV? */
1422 (*name)++;
1423 }
1424
1425 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1426 if (name_cursor < name_em1 &&
1427 ((*name_cursor == ':' && name_cursor[1] == ':')
1428 || *name_cursor == '\''))
1429 {
1430 if (!*stash)
1431 *stash = PL_defstash;
1432 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1433 return FALSE;
1434
1435 *len = name_cursor - *name;
1436 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1437 const char *key;
1438 GV**gvp;
1439 if (*name_cursor == ':') {
1440 key = *name;
1441 *len += 2;
1442 }
1443 else {
1444 char *tmpbuf;
1445 Newx(tmpbuf, *len+2, char);
1446 Copy(*name, tmpbuf, *len, char);
1447 tmpbuf[(*len)++] = ':';
1448 tmpbuf[(*len)++] = ':';
1449 key = tmpbuf;
1450 }
1451 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -(*len) : *len, add);
1452 *gv = gvp ? *gvp : NULL;
1453 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1454 if (SvTYPE(*gv) != SVt_PVGV)
1455 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1456 else
1457 GvMULTI_on(*gv);
1458 }
1459 if (key != *name)
1460 Safefree(key);
1461 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1462 return FALSE;
1463
1464 if (!(*stash = GvHV(*gv))) {
1465 *stash = GvHV(*gv) = newHV();
1466 if (!HvNAME_get(*stash)) {
1467 if (GvSTASH(*gv) == PL_defstash && *len == 6
1468 && strnEQ(*name, "CORE", 4))
1469 hv_name_set(*stash, "CORE", 4, 0);
1470 else
1471 hv_name_set(
1472 *stash, nambeg, name_cursor-nambeg, is_utf8
1473 );
1474 /* If the containing stash has multiple effective
1475 names, see that this one gets them, too. */
1476 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1477 mro_package_moved(*stash, NULL, *gv, 1);
1478 }
1479 }
1480 else if (!HvNAME_get(*stash))
1481 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1482 }
1483
1484 if (*name_cursor == ':')
1485 name_cursor++;
1486 *name = name_cursor+1;
1487 if (*name == name_end) {
1488 if (!*gv)
1489 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1490 return TRUE;
1491 }
1492 }
1493 }
1494 *len = name_cursor - *name;
1495 return TRUE;
1496}
1497
1498/* This function is called if parse_gv_stash_name() failed to
1499 * find a stash, or if GV_NOTQUAL or an empty name was passed
1500 * to gv_fetchpvn_flags.
1501 *
1502 * It returns FALSE if the default stash can't be found nor created,
1503 * which might happen during global destruction.
1504 */
1505PERL_STATIC_INLINE bool
1506S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1507 const U32 is_utf8, const I32 add,
1508 const svtype sv_type)
1509{
1510 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1511
1512 /* No stash in name, so see how we can default */
1513
1514 /* If it's an alphanumeric variable */
1515 if (len && isIDFIRST_lazy_if(name, is_utf8)) {
1516 bool global = FALSE;
1517
1518 /* Some "normal" variables are always in main::,
1519 * like INC or STDOUT.
1520 */
1521 switch (len) {
1522 case 1:
1523 if (*name == '_')
1524 global = TRUE;
1525 break;
1526 case 3:
1527 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1528 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1529 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
1530 global = TRUE;
1531 break;
1532 case 4:
1533 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1534 && name[3] == 'V')
1535 global = TRUE;
1536 break;
1537 case 5:
1538 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1539 && name[3] == 'I' && name[4] == 'N')
1540 global = TRUE;
1541 break;
1542 case 6:
1543 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1544 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1545 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1546 global = TRUE;
1547 break;
1548 case 7:
1549 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1550 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1551 && name[6] == 'T')
1552 global = TRUE;
1553 break;
1554 }
1555
1556 if (global)
1557 *stash = PL_defstash;
1558 else if (IN_PERL_COMPILETIME) {
1559 *stash = PL_curstash;
1560 if (add && (PL_hints & HINT_STRICT_VARS) &&
1561 sv_type != SVt_PVCV &&
1562 sv_type != SVt_PVGV &&
1563 sv_type != SVt_PVFM &&
1564 sv_type != SVt_PVIO &&
1565 !(len == 1 && sv_type == SVt_PV &&
1566 (*name == 'a' || *name == 'b')) )
1567 {
1568 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -len : len,0);
1569 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1570 SvTYPE(*gvp) != SVt_PVGV)
1571 {
1572 *stash = NULL;
1573 }
1574 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1575 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1576 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1577 {
1578 /* diag_listed_as: Variable "%s" is not imported%s */
1579 Perl_ck_warner_d(
1580 aTHX_ packWARN(WARN_MISC),
1581 "Variable \"%c%"UTF8f"\" is not imported",
1582 sv_type == SVt_PVAV ? '@' :
1583 sv_type == SVt_PVHV ? '%' : '$',
1584 UTF8fARG(is_utf8, len, name));
1585 if (GvCVu(*gvp))
1586 Perl_ck_warner_d(
1587 aTHX_ packWARN(WARN_MISC),
1588 "\t(Did you mean &%"UTF8f" instead?)\n",
1589 UTF8fARG(is_utf8, len, name)
1590 );
1591 *stash = NULL;
1592 }
1593 }
1594 }
1595 else {
1596 /* Use the current op's stash */
1597 *stash = CopSTASH(PL_curcop);
1598 }
1599 }
1600 /* *{""}, or a special variable like $@ */
1601 else
1602 *stash = PL_defstash;
1603
1604 if (!*stash) {
1605 if (add && !PL_in_clean_all) {
1606 SV * const err = Perl_mess(aTHX_
1607 "Global symbol \"%s%"UTF8f
1608 "\" requires explicit package name",
1609 (sv_type == SVt_PV ? "$"
1610 : sv_type == SVt_PVAV ? "@"
1611 : sv_type == SVt_PVHV ? "%"
1612 : ""), UTF8fARG(is_utf8, len, name));
1613 GV *gv;
1614 if (is_utf8)
1615 SvUTF8_on(err);
1616 qerror(err);
cd164bf8
BF
1617 /* To maintain the output of errors after the strict exception
1618 * above, and to keep compat with older releases, rather than
1619 * placing the variables in the pad, we place
1620 * them in the <none>:: stash.
1621 */
90aeefb4
BF
1622 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1623 if (!gv) {
1624 /* symbol table under destruction */
1625 return FALSE;
1626 }
1627 *stash = GvHV(gv);
1628 }
1629 else
1630 return FALSE;
1631 }
1632
1633 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1634 return FALSE;
1635
1636 return TRUE;
1637}
1638
71c35c05
BF
1639/* magicalize_gv() gets called by gv_fetchpvn_flags when creating a new GV */
1640PERL_STATIC_INLINE GV*
1641S_magicalize_gv(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
1642 bool addmg, const svtype sv_type)
79072805 1643{
960b831f 1644 SSize_t paren;
79072805 1645
71c35c05 1646 PERL_ARGS_ASSERT_MAGICALIZE_GV;
90aeefb4 1647
44428a46 1648 if (stash != PL_defstash) { /* not the main stash */
5fdfd519 1649 /* We only have to check for three names here: EXPORT, ISA
4aaa4757
FC
1650 and VERSION. All the others apply only to the main stash or to
1651 CORE (which is checked right after this). */
f4e68e82 1652 if (len > 2) {
b464bac0 1653 const char * const name2 = name + 1;
cc4c2da6 1654 switch (*name) {
cc4c2da6
NC
1655 case 'E':
1656 if (strnEQ(name2, "XPORT", 5))
1657 GvMULTI_on(gv);
1658 break;
1659 case 'I':
44428a46 1660 if (strEQ(name2, "SA"))
290a1700 1661 gv_magicalize_isa(gv);
cc4c2da6 1662 break;
44428a46
FC
1663 case 'V':
1664 if (strEQ(name2, "ERSION"))
1665 GvMULTI_on(gv);
1666 break;
4aaa4757
FC
1667 default:
1668 goto try_core;
1669 }
23496c6e 1670 goto add_magical_gv;
4aaa4757
FC
1671 }
1672 try_core:
1673 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1674 /* Avoid null warning: */
1675 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC
1676 if (strnEQ(stashname, "CORE", 4))
1677 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC
1678 }
1679 }
1680 else if (len > 1) {
1681#ifndef EBCDIC
1682 if (*name > 'V' ) {
1683 NOOP;
1684 /* Nothing else to do.
1685 The compiler will probably turn the switch statement into a
1686 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW
1687 the common case of lower case variable names. (On EBCDIC
1688 platforms, we can't just do:
1689 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1690 because cases like '\027' in the switch statement below are
1691 C1 (non-ASCII) controls on those platforms, so the remapping
1692 would make them larger than 'V')
1693 */
44428a46
FC
1694 } else
1695#endif
1696 {
1697 const char * const name2 = name + 1;
1698 switch (*name) {
1699 case 'A':
1700 if (strEQ(name2, "RGV")) {
1701 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1702 }
1703 else if (strEQ(name2, "RGVOUT")) {
1704 GvMULTI_on(gv);
1705 }
1706 break;
1707 case 'E':
1708 if (strnEQ(name2, "XPORT", 5))
1709 GvMULTI_on(gv);
1710 break;
1711 case 'I':
1712 if (strEQ(name2, "SA")) {
290a1700 1713 gv_magicalize_isa(gv);
44428a46
FC
1714 }
1715 break;
cc4c2da6
NC
1716 case 'S':
1717 if (strEQ(name2, "IG")) {
1718 HV *hv;
1719 I32 i;
d525a7b2
NC
1720 if (!PL_psig_name) {
1721 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1722 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1723 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1724 } else {
1725 /* I think that the only way to get here is to re-use an
1726 embedded perl interpreter, where the previous
1727 use didn't clean up fully because
1728 PL_perl_destruct_level was 0. I'm not sure that we
1729 "support" that, in that I suspect in that scenario
1730 there are sufficient other garbage values left in the
1731 interpreter structure that something else will crash
1732 before we get here. I suspect that this is one of
1733 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1734 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1735 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
1736 }
1737 GvMULTI_on(gv);
1738 hv = GvHVn(gv);
a0714e2c 1739 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1740 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1741 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
1742 if (init)
1743 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
1744 }
1745 }
1746 break;
1747 case 'V':
1748 if (strEQ(name2, "ERSION"))
1749 GvMULTI_on(gv);
1750 break;
e5218da5
GA
1751 case '\003': /* $^CHILD_ERROR_NATIVE */
1752 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1753 goto magicalize;
1754 break;
cc4c2da6
NC
1755 case '\005': /* $^ENCODING */
1756 if (strEQ(name2, "NCODING"))
1757 goto magicalize;
1758 break;
9ebf26ad
FR
1759 case '\007': /* $^GLOBAL_PHASE */
1760 if (strEQ(name2, "LOBAL_PHASE"))
1761 goto ro_magicalize;
1762 break;
8561ea1d
FC
1763 case '\014': /* $^LAST_FH */
1764 if (strEQ(name2, "AST_FH"))
1765 goto ro_magicalize;
1766 break;
cde0cee5 1767 case '\015': /* $^MATCH */
960b831f
NC
1768 if (strEQ(name2, "ATCH")) {
1769 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1770 goto storeparen;
1771 }
66230c86 1772 break;
cc4c2da6
NC
1773 case '\017': /* $^OPEN */
1774 if (strEQ(name2, "PEN"))
1775 goto magicalize;
1776 break;
cde0cee5 1777 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC
1778 if (strEQ(name2, "REMATCH")) {
1779 paren = RX_BUFF_IDX_CARET_PREMATCH;
1780 goto storeparen;
1781 }
1782 if (strEQ(name2, "OSTMATCH")) {
1783 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1784 goto storeparen;
1785 }
9ebf26ad 1786 break;
cc4c2da6
NC
1787 case '\024': /* ${^TAINT} */
1788 if (strEQ(name2, "AINT"))
1789 goto ro_magicalize;
1790 break;
7cebcbc0 1791 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1792 if (strEQ(name2, "NICODE"))
cc4c2da6 1793 goto ro_magicalize;
a0288114 1794 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1795 goto ro_magicalize;
e07ea26a
NC
1796 if (strEQ(name2, "TF8CACHE"))
1797 goto magicalize;
cc4c2da6
NC
1798 break;
1799 case '\027': /* $^WARNING_BITS */
1800 if (strEQ(name2, "ARNING_BITS"))
1801 goto magicalize;
1802 break;
1803 case '1':
1804 case '2':
1805 case '3':
1806 case '4':
1807 case '5':
1808 case '6':
1809 case '7':
1810 case '8':
1811 case '9':
85e6fe83 1812 {
2fdbfb4d
AB
1813 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1814 this test */
1815 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC
1816 const char *end = name + len;
1817 while (--end > name) {
23496c6e 1818 if (!isDIGIT(*end)) goto add_magical_gv;
cc4c2da6 1819 }
960b831f
NC
1820 paren = strtoul(name, NULL, 10);
1821 goto storeparen;
1d7c1841 1822 }
dc437b57 1823 }
93a17b20 1824 }
392db708
NC
1825 } else {
1826 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1827 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1828 switch (*name) {
6361f656 1829 case '&': /* $& */
960b831f
NC
1830 paren = RX_BUFF_IDX_FULLMATCH;
1831 goto sawampersand;
6361f656 1832 case '`': /* $` */
960b831f
NC
1833 paren = RX_BUFF_IDX_PREMATCH;
1834 goto sawampersand;
6361f656 1835 case '\'': /* $' */
960b831f
NC
1836 paren = RX_BUFF_IDX_POSTMATCH;
1837 sawampersand:
1a904fc8 1838#ifdef PERL_SAWAMPERSAND
a289ef89 1839 if (!(
cc4c2da6
NC
1840 sv_type == SVt_PVAV ||
1841 sv_type == SVt_PVHV ||
1842 sv_type == SVt_PVCV ||
1843 sv_type == SVt_PVFM ||
1844 sv_type == SVt_PVIO
d3b97530
DM
1845 )) { PL_sawampersand |=
1846 (*name == '`')
1847 ? SAWAMPERSAND_LEFT
1848 : (*name == '&')
1849 ? SAWAMPERSAND_MIDDLE
1850 : SAWAMPERSAND_RIGHT;
1851 }
1a904fc8 1852#endif
960b831f 1853 goto storeparen;
e91d8259
NC
1854 case '1': /* $1 */
1855 case '2': /* $2 */
1856 case '3': /* $3 */
1857 case '4': /* $4 */
1858 case '5': /* $5 */
1859 case '6': /* $6 */
1860 case '7': /* $7 */
1861 case '8': /* $8 */
1862 case '9': /* $9 */
960b831f
NC
1863 paren = *name - '0';
1864
1865 storeparen:
e91d8259
NC
1866 /* Flag the capture variables with a NULL mg_ptr
1867 Use mg_len for the array index to lookup. */
960b831f 1868 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 1869 break;
cc4c2da6 1870
6361f656 1871 case ':': /* $: */
c69033f2 1872 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
1873 goto magicalize;
1874
6361f656 1875 case '?': /* $? */
ff0cee69 1876#ifdef COMPLEX_STATUS
c69033f2 1877 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1878#endif
cc4c2da6 1879 goto magicalize;
ff0cee69 1880
6361f656 1881 case '!': /* $! */
67261566 1882 GvMULTI_on(gv);
44a2ac75 1883 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1884
ad64d0ec 1885 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1886
44a2ac75 1887 /* magicalization must be done before require_tie_mod is called */
67261566 1888 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd
FC
1889 {
1890 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1891 addmg = 0;
44a2ac75 1892 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
ffdb8bcd 1893 }
d2c93421 1894
6cef1e77 1895 break;
6361f656
AB
1896 case '-': /* $- */
1897 case '+': /* $+ */
44a2ac75
YO
1898 GvMULTI_on(gv); /* no used once warnings here */
1899 {
44a2ac75 1900 AV* const av = GvAVn(gv);
ad64d0ec 1901 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 1902
ad64d0ec
NC
1903 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1904 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 1905 if (avc)
44a2ac75 1906 SvREADONLY_on(GvSVn(gv));
44a2ac75 1907 SvREADONLY_on(av);
67261566
YO
1908
1909 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4
FC
1910 {
1911 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1912 addmg = 0;
192b9cd1 1913 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
213084e4 1914 }
67261566 1915
80305961 1916 break;
cc4c2da6 1917 }
6361f656
AB
1918 case '*': /* $* */
1919 case '#': /* $# */
9b387841 1920 if (sv_type == SVt_PV)
4f650b80 1921 /* diag_listed_as: $* is no longer supported */
9b387841 1922 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 1923 "$%c is no longer supported", *name);
8ae1fe26 1924 break;
b3ca2e83
NC
1925 case '\010': /* $^H */
1926 {
1927 HV *const hv = GvHVn(gv);
1928 hv_magic(hv, NULL, PERL_MAGIC_hints);
1929 }
1930 goto magicalize;
b82b06b8 1931 case '[': /* $[ */
7d69d4a6 1932 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 1933 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8
FC
1934 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1935 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
1936 addmg = 0;
1937 }
7d69d4a6 1938 else goto magicalize;
b82b06b8 1939 break;
cc4c2da6 1940 case '\023': /* $^S */
2fdbfb4d
AB
1941 ro_magicalize:
1942 SvREADONLY_on(GvSVn(gv));
1943 /* FALL THROUGH */
6361f656 1944 case '0': /* $0 */
6361f656
AB
1945 case '^': /* $^ */
1946 case '~': /* $~ */
1947 case '=': /* $= */
1948 case '%': /* $% */
1949 case '.': /* $. */
1950 case '(': /* $( */
1951 case ')': /* $) */
1952 case '<': /* $< */
1953 case '>': /* $> */
1954 case '\\': /* $\ */
1955 case '/': /* $/ */
4505a31f 1956 case '|': /* $| */
9cdac2a2 1957 case '$': /* $$ */
cc4c2da6
NC
1958 case '\001': /* $^A */
1959 case '\003': /* $^C */
1960 case '\004': /* $^D */
1961 case '\005': /* $^E */
1962 case '\006': /* $^F */
cc4c2da6
NC
1963 case '\011': /* $^I, NOT \t in EBCDIC */
1964 case '\016': /* $^N */
1965 case '\017': /* $^O */
1966 case '\020': /* $^P */
1967 case '\024': /* $^T */
1968 case '\027': /* $^W */
1969 magicalize:
ad64d0ec 1970 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 1971 break;
e521374c 1972
cc4c2da6 1973 case '\014': /* $^L */
76f68e9b 1974 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 1975 break;
6361f656 1976 case ';': /* $; */
76f68e9b 1977 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 1978 break;
6361f656 1979 case ']': /* $] */
cc4c2da6 1980 {
3638bf15 1981 SV * const sv = GvSV(gv);
d7aa5382 1982 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 1983 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
1984 GvSV(gv) = vnumify(PL_patchlevel);
1985 SvREADONLY_on(GvSV(gv));
1986 SvREFCNT_dec(sv);
93a17b20
LW
1987 }
1988 break;
cc4c2da6
NC
1989 case '\026': /* $^V */
1990 {
3638bf15 1991 SV * const sv = GvSV(gv);
f9be5ac8
DM
1992 GvSV(gv) = new_version(PL_patchlevel);
1993 SvREADONLY_on(GvSV(gv));
1994 SvREFCNT_dec(sv);
16070b82
GS
1995 }
1996 break;
cc4c2da6 1997 }
79072805 1998 }
23496c6e
FC
1999 add_magical_gv:
2000 if (addmg) {
2001 if (GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv) || (
2002 GvSV(gv) && (SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv)))
2003 ))
0f43181e 2004 (void)hv_store(stash,name,len,(SV *)gv,0);
e7881358 2005 else SvREFCNT_dec_NN(gv), gv = NULL;
23496c6e 2006 }
71c35c05
BF
2007
2008 return gv;
2009}
2010
070dc475
BF
2011/* This function is called when the stash already holds the GV of the magic
2012 * variable we're looking for, but we need to check that it has the correct
2013 * kind of magic. For example, if someone first uses $! and then %!, the
2014 * latter would end up here, and we add the Errno tie to the HASH slot of
2015 * the *! glob.
2016 */
2017PERL_STATIC_INLINE void
2018S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2019{
2020 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2021
2022 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2023 if (*name == '!')
2024 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2025 else if (*name == '-' || *name == '+')
2026 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2027 } else if (sv_type == SVt_PV) {
2028 if (*name == '*' || *name == '#') {
2029 /* diag_listed_as: $* is no longer supported */
2030 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2031 WARN_SYNTAX),
2032 "$%c is no longer supported", *name);
2033 }
2034 }
2035 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2036 switch (*name) {
2037 case '[':
2038 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2039 break;
2040#ifdef PERL_SAWAMPERSAND
2041 case '`':
2042 PL_sawampersand |= SAWAMPERSAND_LEFT;
2043 (void)GvSVn(gv);
2044 break;
2045 case '&':
2046 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2047 (void)GvSVn(gv);
2048 break;
2049 case '\'':
2050 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2051 (void)GvSVn(gv);
2052 break;
2053#endif
2054 }
2055 }
2056}
2057
71c35c05
BF
2058GV *
2059Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2060 const svtype sv_type)
2061{
2062 dVAR;
2063 const char *name = nambeg;
2064 GV *gv = NULL;
2065 GV**gvp;
2066 STRLEN len;
2067 HV *stash = NULL;
2068 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2069 const I32 no_expand = flags & GV_NOEXPAND;
2070 const I32 add = flags & ~GV_NOADD_MASK;
2071 const U32 is_utf8 = flags & SVf_UTF8;
2072 bool addmg = !!(flags & GV_ADDMG);
2073 const char *const name_end = nambeg + full_len;
2074 U32 faking_it;
2075
2076 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2077
2078 /* If we have GV_NOTQUAL, the caller promised that
2079 * there is no stash, so we can skip the check.
2080 * Similarly if full_len is 0, since then we're
2081 * dealing with something like *{""} or ""->foo()
2082 */
2083 if ((flags & GV_NOTQUAL) || !full_len) {
2084 len = full_len;
2085 }
2086 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2087 if (name == name_end) return gv;
2088 }
2089 else {
2090 return NULL;
2091 }
2092
2093 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2094 return NULL;
2095 }
2096
2097 /* By this point we should have a stash and a name */
2098 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,add);
2099 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2100 if (addmg) gv = (GV *)newSV(0);
2101 else return NULL;
2102 }
2103 else gv = *gvp, addmg = 0;
2104 /* From this point on, addmg means gv has not been inserted in the
2105 symtab yet. */
2106
2107 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF
2108 /* The GV already exists, so return it, but check if we need to do
2109 * anything else with it before that.
2110 */
71c35c05 2111 if (add) {
c002ae9a
BF
2112 /* This is the heuristic that handles if a variable triggers the
2113 * 'used only once' warning. If there's already a GV in the stash
2114 * with this name, then we assume that the variable has been used
2115 * before and turn its MULTI flag on.
2116 * It's a heuristic because it can easily be "tricked", like with
2117 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2118 * not warning about $main::foo being used just once
2119 */
71c35c05
BF
2120 GvMULTI_on(gv);
2121 gv_init_svtype(gv, sv_type);
2122 /* You reach this path once the typeglob has already been created,
2123 either by the same or a different sigil. If this path didn't
2124 exist, then (say) referencing $! first, and %! second would
2125 mean that %! was not handled correctly. */
2126 if (len == 1 && stash == PL_defstash) {
070dc475 2127 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF
2128 }
2129 else if (len == 3 && sv_type == SVt_PVAV
2130 && strnEQ(name, "ISA", 3)
2131 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2132 gv_magicalize_isa(gv);
2133 }
2134 return gv;
2135 } else if (no_init) {
2136 assert(!addmg);
2137 return gv;
c002ae9a
BF
2138 }
2139 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2140 * don't expand it to a glob. This is an optimization so that things
2141 * copying constants over, like Exporter, don't have to be rewritten
2142 * to take into account that you can store more than just globs in
2143 * stashes.
2144 */
2145 else if (no_expand && SvROK(gv)) {
71c35c05
BF
2146 assert(!addmg);
2147 return gv;
2148 }
2149
2150 /* Adding a new symbol.
2151 Unless of course there was already something non-GV here, in which case
2152 we want to behave as if there was always a GV here, containing some sort
2153 of subroutine.
2154 Otherwise we run the risk of creating things like GvIO, which can cause
2155 subtle bugs. eg the one that tripped up SQL::Translator */
2156
2157 faking_it = SvOK(gv);
2158
2159 if (add & GV_ADDWARN)
2160 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2161 "Had to create %"UTF8f" unexpectedly",
2162 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2163 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2164
9e5de6ae 2165 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF
2166 GvMULTI_on(gv) ;
2167
2168 /* set up magic where warranted */
2169 gv = magicalize_gv(gv, stash, name, len, addmg, sv_type);
2170
e6066781 2171 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2172 return gv;
79072805
LW
2173}
2174
2175void
35a4481c 2176Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2177{
ed60a868 2178 const char *name;
35a4481c 2179 const HV * const hv = GvSTASH(gv);
7918f24d
NC
2180
2181 PERL_ARGS_ASSERT_GV_FULLNAME4;
2182
666ea192 2183 sv_setpv(sv, prefix ? prefix : "");
a0288114 2184
52a6327b 2185 if (hv && (name = HvNAME(hv))) {
ed60a868
FC
2186 const STRLEN len = HvNAMELEN(hv);
2187 if (keepmain || strnNE(name, "main", len)) {
2188 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2189 sv_catpvs(sv,"::");
ed60a868 2190 }
43693395 2191 }
ed60a868 2192 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2193 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2194}
2195
2196void
35a4481c 2197Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2198{
099be4f1 2199 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2200
2201 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2202
46c461b5 2203 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2204}
2205
79072805 2206void
51da40ed 2207Perl_gv_check(pTHX_ HV *stash)
79072805 2208{
97aff369 2209 dVAR;
eb578fdb 2210 I32 i;
463ee0b2 2211
7918f24d
NC
2212 PERL_ARGS_ASSERT_GV_CHECK;
2213
8990e307
LW
2214 if (!HvARRAY(stash))
2215 return;
a0d0e21e 2216 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2217 const HE *entry;
51da40ed
FC
2218 /* SvIsCOW is unused on HVs, so we can use it to mark stashes we
2219 are currently searching through recursively. */
2220 SvIsCOW_on(stash);
dc437b57 2221 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2222 GV *gv;
b7787f18 2223 HV *hv;
dc437b57 2224 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2225 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2226 {
51da40ed 2227 if (hv != PL_defstash && hv != stash && !SvIsCOW(hv))
a0d0e21e
LW
2228 gv_check(hv); /* nested package */
2229 }
ecad31f0
BF
2230 else if ( *HeKEY(entry) != '_'
2231 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2232 const char *file;
159b6efe 2233 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2234 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2235 continue;
1d7c1841 2236 file = GvFILE(gv);
1d7c1841 2237 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC
2238#ifdef USE_ITHREADS
2239 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2240#else
2241 CopFILEGV(PL_curcop)
2242 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2243#endif
9014280d 2244 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC
2245 "Name \"%"HEKf"::%"HEKf
2246 "\" used only once: possible typo",
2247 HEKfARG(HvNAME_HEK(stash)),
2248 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2249 }
79072805 2250 }
51da40ed 2251 SvIsCOW_off(stash);
79072805
LW
2252 }
2253}
2254
2255GV *
9cc50d5b 2256Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2257{
97aff369 2258 dVAR;
9cc50d5b 2259 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2260 assert(!(flags & ~SVf_UTF8));
7918f24d 2261
b17a0679
FC
2262 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2263 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF
2264 (long)PL_gensym++),
2265 GV_ADD, SVt_PVGV);
79072805
LW
2266}
2267
2268/* hopefully this is only called on local symbol table entries */
2269
2270GP*
864dbfa3 2271Perl_gp_ref(pTHX_ GP *gp)
79072805 2272{
97aff369 2273 dVAR;
1d7c1841 2274 if (!gp)
d4c19fe8 2275 return NULL;
79072805 2276 gp->gp_refcnt++;
44a8e56a
PP
2277 if (gp->gp_cv) {
2278 if (gp->gp_cvgen) {
e1a479c5
BB
2279 /* If the GP they asked for a reference to contains
2280 a method cache entry, clear it first, so that we
2281 don't infect them with our cached entry */
e7881358 2282 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2283 gp->gp_cv = NULL;
44a8e56a
PP
2284 gp->gp_cvgen = 0;
2285 }
44a8e56a 2286 }
79072805 2287 return gp;
79072805
LW
2288}
2289
2290void
864dbfa3 2291Perl_gp_free(pTHX_ GV *gv)
79072805 2292{
97aff369 2293 dVAR;
79072805 2294 GP* gp;
b0d55c99 2295 int attempts = 100;
79072805 2296
f7877b28 2297 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2298 return;
f248d071 2299 if (gp->gp_refcnt == 0) {
9b387841
NC
2300 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2301 "Attempt to free unreferenced glob pointers"
2302 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2303 return;
2304 }
748a9306
LW
2305 if (--gp->gp_refcnt > 0) {
2306 if (gp->gp_egv == gv)
2307 gp->gp_egv = 0;
c43ae56f 2308 GvGP_set(gv, NULL);
79072805 2309 return;
748a9306 2310 }
79072805 2311
b0d55c99
FC
2312 while (1) {
2313 /* Copy and null out all the glob slots, so destructors do not see
2314 freed SVs. */
2315 HEK * const file_hek = gp->gp_file_hek;
2316 SV * const sv = gp->gp_sv;
2317 AV * const av = gp->gp_av;
2318 HV * const hv = gp->gp_hv;
2319 IO * const io = gp->gp_io;
2320 CV * const cv = gp->gp_cv;
2321 CV * const form = gp->gp_form;
2322
2323 gp->gp_file_hek = NULL;
2324 gp->gp_sv = NULL;
2325 gp->gp_av = NULL;
2326 gp->gp_hv = NULL;
2327 gp->gp_io = NULL;
2328 gp->gp_cv = NULL;
2329 gp->gp_form = NULL;
2330
2331 if (file_hek)
2332 unshare_hek(file_hek);
2333
2334 SvREFCNT_dec(sv);
2335 SvREFCNT_dec(av);
2336 /* FIXME - another reference loop GV -> symtab -> GV ?
2337 Somehow gp->gp_hv can end up pointing at freed garbage. */
2338 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2339 const HEK *hvname_hek = HvNAME_HEK(hv);
103f5a36 2340 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", hvname_hek));
c2242065
BF
2341 if (PL_stashcache && hvname_hek)
2342 (void)hv_delete(PL_stashcache, HEK_KEY(hvname_hek),
2343 (HEK_UTF8(hvname_hek) ? -HEK_LEN(hvname_hek) : HEK_LEN(hvname_hek)),
2344 G_DISCARD);
b0d55c99
FC
2345 SvREFCNT_dec(hv);
2346 }
2347 SvREFCNT_dec(io);
2348 SvREFCNT_dec(cv);
2349 SvREFCNT_dec(form);
2350
2351 if (!gp->gp_file_hek
2352 && !gp->gp_sv
2353 && !gp->gp_av
2354 && !gp->gp_hv
2355 && !gp->gp_io
2356 && !gp->gp_cv
2357 && !gp->gp_form) break;
2358
2359 if (--attempts == 0) {
2360 Perl_die(aTHX_
2361 "panic: gp_free failed to free glob pointer - "
2362 "something is repeatedly re-creating entries"
2363 );
2364 }
13207a71 2365 }
748a9306 2366
79072805 2367 Safefree(gp);
c43ae56f 2368 GvGP_set(gv, NULL);
79072805
LW
2369}
2370
d460ef45
NIS
2371int
2372Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2373{
53c1dcc0
AL
2374 AMT * const amtp = (AMT*)mg->mg_ptr;
2375 PERL_UNUSED_ARG(sv);
dd374669 2376
7918f24d
NC
2377 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2378
d460ef45
NIS
2379 if (amtp && AMT_AMAGIC(amtp)) {
2380 int i;
2381 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2382 CV * const cv = amtp->table[i];
b37c2d43 2383 if (cv) {
e7881358 2384 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2385 amtp->table[i] = NULL;
d460ef45
NIS
2386 }
2387 }
2388 }
2389 return 0;
2390}
2391
a0d0e21e 2392/* Updates and caches the CV's */
c3a9a790
RGS
2393/* Returns:
2394 * 1 on success and there is some overload
2395 * 0 if there is no overload
2396 * -1 if some error occurred and it couldn't croak
2397 */
a0d0e21e 2398
c3a9a790 2399int
242f8760 2400Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2401{
97aff369 2402 dVAR;
ad64d0ec 2403 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2404 AMT amt;
9b439311 2405 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2406 U32 newgen;
a0d0e21e 2407
7918f24d
NC
2408 PERL_ARGS_ASSERT_GV_AMUPDATE;
2409
9b439311 2410 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2411 if (mg) {
2412 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2413 if (amtp->was_ok_sub == newgen) {
8c34e50d 2414 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2415 }
ad64d0ec 2416 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2417 }
a0d0e21e 2418
bfcb3514 2419 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2420
d460ef45 2421 Zero(&amt,1,AMT);
e1a479c5 2422 amt.was_ok_sub = newgen;
a6006777
PP
2423 amt.fallback = AMGfallNO;
2424 amt.flags = 0;
2425
a6006777 2426 {
8c34e50d
FC
2427 int filled = 0;
2428 int i;
a6006777 2429
3866ea3b 2430 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2431
89ffc314 2432 /* Try to find via inheritance. */
e6919483 2433 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2434 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2435 CV* cv;
89ffc314
IZ
2436
2437 if (!gv)
3866ea3b
FC
2438 {
2439 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2440 goto no_table;
3866ea3b
FC
2441 }
2442#ifdef PERL_DONT_CREATE_GVSV
2443 else if (!sv) {
6f207bd3 2444 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC
2445 }
2446#endif
79c9643d
JL
2447 else if (SvTRUE(sv))
2448 /* don't need to set overloading here because fallback => 1
2449 * is the default setting for classes without overloading */
89ffc314 2450 amt.fallback=AMGfallYES;
79c9643d
JL
2451 else if (SvOK(sv)) {
2452 amt.fallback=AMGfallNEVER;
386a5489 2453 filled = 1;
386a5489 2454 }
79c9643d 2455 else {
386a5489 2456 filled = 1;
386a5489 2457 }
a6006777 2458
8c34e50d 2459 for (i = 1; i < NofAMmeth; i++) {
6136c704 2460 const char * const cooky = PL_AMG_names[i];
32251b26 2461 /* Human-readable form, for debugging: */
8c34e50d 2462 const char * const cp = AMG_id2name(i);
d279ab82 2463 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2464
a0288114 2465 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2466 cp, HvNAME_get(stash)) );
611c1e95
IZ
2467 /* don't fill the cache while looking up!
2468 Creation of inheritance stubs in intermediate packages may
2469 conflict with the logic of runtime method substitution.
2470 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2471 then we could have created stubs for "(+0" in A and C too.
2472 But if B overloads "bool", we may want to use it for
2473 numifying instead of C's "+0". */
8c34e50d 2474 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2475 cv = 0;
89ffc314 2476 if (gv && (cv = GvCV(gv))) {
f0e9f182
FC
2477 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2478 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2479 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2480 && strEQ(hvname, "overload")) {
611c1e95
IZ
2481 /* This is a hack to support autoloading..., while
2482 knowing *which* methods were declared as overloaded. */
44a8e56a 2483 /* GvSV contains the name of the method. */
6136c704 2484 GV *ngv = NULL;
c69033f2 2485 SV *gvsv = GvSV(gv);
a0288114
AL
2486
2487 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2488 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2489 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2490 if (!gvsv || !SvPOK(gvsv)
7f415459 2491 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2492 {
a0288114 2493 /* Can be an import stub (created by "can"). */
242f8760 2494 if (destructing) {
c3a9a790 2495 return -1;
242f8760
RGS
2496 }
2497 else {
d66cca07
BF
2498 const SV * const name = (gvsv && SvPOK(gvsv))
2499 ? gvsv
2500 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2501 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF
2502 Perl_croak(aTHX_ "%s method \"%"SVf256
2503 "\" overloading \"%s\" "\
d0c0e7dd 2504 "in package \"%"HEKf256"\"",
242f8760
RGS
2505 (GvCVGEN(gv) ? "Stub found while resolving"
2506 : "Can't resolve"),
d66cca07 2507 SVfARG(name), cp,
d0c0e7dd 2508 HEKfARG(
d66cca07 2509 HvNAME_HEK(stash)
d0c0e7dd 2510 ));
242f8760 2511 }
44a8e56a 2512 }
dc848c6f 2513 cv = GvCV(gv = ngv);
f0e9f182 2514 }
44a8e56a 2515 }
b464bac0 2516 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2517 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2518 GvNAME(CvGV(cv))) );
2519 filled = 1;
611c1e95 2520 } else if (gv) { /* Autoloaded... */
ea726b52 2521 cv = MUTABLE_CV(gv);
611c1e95 2522 filled = 1;
44a8e56a 2523 }
ea726b52 2524 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
a0d0e21e 2525 }
a0d0e21e 2526 if (filled) {
a6006777 2527 AMT_AMAGIC_on(&amt);
ad64d0ec 2528 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2529 (char*)&amt, sizeof(AMT));
8c34e50d 2530 return TRUE;
a0d0e21e
LW
2531 }
2532 }
a6006777 2533 /* Here we have no table: */
8c34e50d 2534 no_table:
a6006777 2535 AMT_AMAGIC_off(&amt);
ad64d0ec 2536 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2537 (char*)&amt, sizeof(AMTS));
c3a9a790 2538 return 0;
a0d0e21e
LW
2539}
2540
32251b26
IZ
2541
2542CV*
2543Perl_gv_handler(pTHX_ HV *stash, I32 id)
2544{
97aff369 2545 dVAR;
3f8f4626 2546 MAGIC *mg;
32251b26 2547 AMT *amtp;
e1a479c5 2548 U32 newgen;
9b439311 2549 struct mro_meta* stash_meta;
32251b26 2550
bfcb3514 2551 if (!stash || !HvNAME_get(stash))
601f1833 2552 return NULL;
e1a479c5 2553
9b439311
BB
2554 stash_meta = HvMROMETA(stash);
2555 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2556
ad64d0ec 2557 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2558 if (!mg) {
2559 do_update:
8c34e50d 2560 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2561 return NULL;
ad64d0ec 2562 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2563 }
a9fd4e40 2564 assert(mg);
32251b26 2565 amtp = (AMT*)mg->mg_ptr;
66978156 2566 if ( amtp->was_ok_sub != newgen )
32251b26 2567 goto do_update;
3ad83ce7 2568 if (AMT_AMAGIC(amtp)) {
b7787f18 2569 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2570 if (ret && isGV(ret)) { /* Autoloading stab */
2571 /* Passing it through may have resulted in a warning
2572 "Inherited AUTOLOAD for a non-method deprecated", since
2573 our caller is going through a function call, not a method call.
2574 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2575 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2576
2577 if (gv && GvCV(gv))
2578 return GvCV(gv);
2579 }
2580 return ret;
2581 }
a0288114 2582
601f1833 2583 return NULL;
32251b26
IZ
2584}
2585
2586
6f1401dc
DM
2587/* Implement tryAMAGICun_MG macro.
2588 Do get magic, then see if the stack arg is overloaded and if so call it.
2589 Flags:
2590 AMGf_set return the arg using SETs rather than assigning to
2591 the targ
2592 AMGf_numeric apply sv_2num to the stack arg.
2593*/
2594
2595bool
2596Perl_try_amagic_un(pTHX_ int method, int flags) {
2597 dVAR;
2598 dSP;
2599 SV* tmpsv;
2600 SV* const arg = TOPs;
2601
2602 SvGETMAGIC(arg);
2603
9f8bf298
NC
2604 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2605 AMGf_noright | AMGf_unary))) {
6f1401dc
DM
2606 if (flags & AMGf_set) {
2607 SETs(tmpsv);
2608 }
2609 else {
2610 dTARGET;
2611 if (SvPADMY(TARG)) {
2612 sv_setsv(TARG, tmpsv);
2613 SETTARG;
2614 }
2615 else
2616 SETs(tmpsv);
2617 }
2618 PUTBACK;
2619 return TRUE;
2620 }
2621
2622 if ((flags & AMGf_numeric) && SvROK(arg))
2623 *sp = sv_2num(arg);
2624 return FALSE;
2625}
2626
2627
2628/* Implement tryAMAGICbin_MG macro.
2629 Do get magic, then see if the two stack args are overloaded and if so
2630 call it.
2631 Flags:
2632 AMGf_set return the arg using SETs rather than assigning to
2633 the targ
2634 AMGf_assign op may be called as mutator (eg +=)
2635 AMGf_numeric apply sv_2num to the stack arg.
2636*/
2637
2638bool
2639Perl_try_amagic_bin(pTHX_ int method, int flags) {
2640 dVAR;
2641 dSP;
2642 SV* const left = TOPm1s;
2643 SV* const right = TOPs;
2644
2645 SvGETMAGIC(left);
2646 if (left != right)
2647 SvGETMAGIC(right);
2648
2649 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2650 SV * const tmpsv = amagic_call(left, right, method,
2651 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2652 if (tmpsv) {
2653 if (flags & AMGf_set) {
2654 (void)POPs;
2655 SETs(tmpsv);
2656 }
2657 else {
2658 dATARGET;
2659 (void)POPs;
2660 if (opASSIGN || SvPADMY(TARG)) {
2661 sv_setsv(TARG, tmpsv);
2662 SETTARG;
2663 }
2664 else
2665 SETs(tmpsv);
2666 }
2667 PUTBACK;
2668 return TRUE;
2669 }
2670 }
75ea7a12
FC
2671 if(left==right && SvGMAGICAL(left)) {
2672 SV * const left = sv_newmortal();
2673 *(sp-1) = left;
2674 /* Print the uninitialized warning now, so it includes the vari-
2675 able name. */
2676 if (!SvOK(right)) {
2677 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2678 sv_setsv_flags(left, &PL_sv_no, 0);
2679 }
2680 else sv_setsv_flags(left, right, 0);
2681 SvGETMAGIC(right);
2682 }
6f1401dc 2683 if (flags & AMGf_numeric) {
75ea7a12
FC
2684 if (SvROK(TOPm1s))
2685 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
2686 if (SvROK(right))
2687 *sp = sv_2num(right);
2688 }
2689 return FALSE;
2690}
2691
25a9ffce
NC
2692SV *
2693Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2694 SV *tmpsv = NULL;
2695
2696 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2697
2698 while (SvAMAGIC(ref) &&
2699 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2700 AMGf_noright | AMGf_unary))) {
2701 if (!SvROK(tmpsv))
2702 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2703 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2704 /* Bail out if it returns us the same reference. */
2705 return tmpsv;
2706 }
2707 ref = tmpsv;
2708 }
2709 return tmpsv ? tmpsv : ref;
2710}
6f1401dc 2711
8d569291
FC
2712bool
2713Perl_amagic_is_enabled(pTHX_ int method)
2714{
2715 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2716
2717 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2718
2719 if ( !lex_mask || !SvOK(lex_mask) )
2720 /* overloading lexically disabled */
2721 return FALSE;
2722 else if ( lex_mask && SvPOK(lex_mask) ) {
2723 /* we have an entry in the hints hash, check if method has been
2724 * masked by overloading.pm */
2725 STRLEN len;
2726 const int offset = method / 8;
2727 const int bit = method % 8;
2728 char *pv = SvPV(lex_mask, len);
2729
2730 /* Bit set, so this overloading operator is disabled */
2731 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2732 return FALSE;
2733 }
2734 return TRUE;
2735}
2736
a0d0e21e 2737SV*
864dbfa3 2738Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2739{
27da23d5 2740 dVAR;
b267980d 2741 MAGIC *mg;
9c5ffd7c 2742 CV *cv=NULL;
a0d0e21e 2743 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2744 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
2745 int off = 0, off1, lr = 0, notfound = 0;
2746 int postpr = 0, force_cpy = 0;
2747 int assign = AMGf_assign & flags;
2748 const int assignshift = assign ? 1 : 0;
bf5522a1 2749 int use_default_op = 0;
67288365 2750 int force_scalar = 0;
497b47a8
JH
2751#ifdef DEBUGGING
2752 int fl=0;
497b47a8 2753#endif
25716404 2754 HV* stash=NULL;
7918f24d
NC
2755
2756 PERL_ARGS_ASSERT_AMAGIC_CALL;
2757
e46c382e 2758 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2759 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK
2760 }
2761
a0d0e21e 2762 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2763 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2764 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2765 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2766 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2767 : NULL))
b267980d 2768 && ((cv = cvp[off=method+assignshift])
748a9306
LW
2769 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2770 * usual method */
497b47a8
JH
2771 (
2772#ifdef DEBUGGING
2773 fl = 1,
a0288114 2774#endif
497b47a8 2775 cv = cvp[off=method])))) {
a0d0e21e
LW
2776 lr = -1; /* Call method for left argument */
2777 } else {
2778 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2779 int logic;
2780
2781 /* look for substituted methods */
ee239bfe 2782 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
2783 switch (method) {
2784 case inc_amg:
ee239bfe
IZ
2785 force_cpy = 1;
2786 if ((cv = cvp[off=add_ass_amg])
2787 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2788 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2789 }
2790 break;
2791 case dec_amg:
ee239bfe
IZ
2792 force_cpy = 1;
2793 if ((cv = cvp[off = subtr_ass_amg])
2794 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2795 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2796 }
2797 break;
2798 case bool__amg:
2799 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2800 break;
2801 case numer_amg:
2802 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2803 break;
2804 case string_amg:
2805 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2806 break;
b7787f18
AL
2807 case not_amg:
2808 (void)((cv = cvp[off=bool__amg])
2809 || (cv = cvp[off=numer_amg])
2810 || (cv = cvp[off=string_amg]));
2ab54efd
MB
2811 if (cv)
2812 postpr = 1;
b7787f18 2813 break;
748a9306
LW
2814 case copy_amg:
2815 {
76e3520e
GS
2816 /*
2817 * SV* ref causes confusion with the interpreter variable of
2818 * the same name
2819 */
890ce7af 2820 SV* const tmpRef=SvRV(left);
76e3520e 2821 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
2822 /*
2823 * Just to be extra cautious. Maybe in some
2824 * additional cases sv_setsv is safe, too.
2825 */
890ce7af 2826 SV* const newref = newSVsv(tmpRef);
748a9306 2827 SvOBJECT_on(newref);
a1cd65be
FC
2828 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2829 delegate to the stash. */
85fbaab2 2830 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
2831 return newref;
2832 }
2833 }
2834 break;
a0d0e21e 2835 case abs_amg:
b267980d 2836 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2837 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2838 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2839 if (off1==lt_amg) {
890ce7af 2840 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
2841 lt_amg,AMGf_noright);
2842 logic = SvTRUE(lessp);
2843 } else {
890ce7af 2844 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
2845 ncmp_amg,AMGf_noright);
2846 logic = (SvNV(lessp) < 0);
2847 }
2848 if (logic) {
2849 if (off==subtr_amg) {
2850 right = left;
748a9306 2851 left = nullsv;
a0d0e21e
LW
2852 lr = 1;
2853 }
2854 } else {
2855 return left;
2856 }
2857 }
2858 break;
2859 case neg_amg:
155aba94 2860 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW
2861 right = left;
2862 left = sv_2mortal(newSViv(0));
2863 lr = 1;
2864 }
2865 break;
f216259d 2866 case int_amg:
f5284f61 2867 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 2868 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 2869 case regexp_amg:
b267980d
NIS
2870 /* FAIL safe */
2871 return NULL; /* Delegate operation to standard mechanisms. */
2872 break;
f5284f61
IZ
2873 case to_sv_amg:
2874 case to_av_amg:
2875 case to_hv_amg:
2876 case to_gv_amg:
2877 case to_cv_amg:
2878 /* FAIL safe */
b267980d 2879 return left; /* Delegate operation to standard mechanisms. */
f5284f61 2880 break;
a0d0e21e
LW
2881 default:
2882 goto not_found;
2883 }
2884 if (!cv) goto not_found;
2885 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 2886 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 2887 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2888 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2889 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2890 : NULL))
69815d08
RS
2891 && (cv = cvp[off=method])) { /* Method for right
2892 * argument found */
2893 lr=1;
bf5522a1
MB
2894 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2895 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
2896 && !(flags & AMGf_unary)) {
2897 /* We look for substitution for
2898 * comparison operations and
fc36a67e 2899 * concatenation */
a0d0e21e
LW
2900 if (method==concat_amg || method==concat_ass_amg
2901 || method==repeat_amg || method==repeat_ass_amg) {
2902 return NULL; /* Delegate operation to string conversion */
2903 }
2904 off = -1;
2905 switch (method) {
2906 case lt_amg:
2907 case le_amg:
2908 case gt_amg:
2909 case ge_amg:
2910 case eq_amg:
2911 case ne_amg:
2ab54efd
MB
2912 off = ncmp_amg;
2913 break;
a0d0e21e
LW
2914 case slt_amg:
2915 case sle_amg:
2916 case sgt_amg:
2917 case sge_amg:
2918 case seq_amg:
2919 case sne_amg:
2ab54efd
MB
2920 off = scmp_amg;
2921 break;
a0d0e21e 2922 }
bf5522a1
MB
2923 if (off != -1) {
2924 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2925 cv = ocvp[off];
2926 lr = -1;
2927 }
2928 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2929 cv = cvp[off];
2930 lr = 1;
2931 }
2932 }
2933 if (cv)
2ab54efd
MB
2934 postpr = 1;
2935 else
2936 goto not_found;
a0d0e21e 2937 } else {
a6006777 2938 not_found: /* No method found, either report or croak */
b267980d
NIS
2939 switch (method) {
2940 case to_sv_amg:
2941 case to_av_amg:
2942 case to_hv_amg:
2943 case to_gv_amg:
2944 case to_cv_amg:
2945 /* FAIL safe */
2946 return left; /* Delegate operation to standard mechanisms. */
2947 break;
2948 }
a0d0e21e
LW
2949 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2950 notfound = 1; lr = -1;
2951 } else if (cvp && (cv=cvp[nomethod_amg])) {
2952 notfound = 1; lr = 1;
bf5522a1
MB
2953 } else if ((use_default_op =
2954 (!ocvp || oamtp->fallback >= AMGfallYES)
2955 && (!cvp || amtp->fallback >= AMGfallYES))
2956 && !DEBUG_o_TEST) {
4cc0ca18
NC
2957 /* Skip generating the "no method found" message. */
2958 return NULL;
a0d0e21e 2959 } else {
46fc3d4c 2960 SV *msg;
774d564b 2961 if (off==-1) off=method;
b267980d 2962 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF
2963 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
2964 AMG_id2name(method + assignshift),
2965 (flags & AMGf_unary ? " " : "\n\tleft "),
2966 SvAMAGIC(left)?
2967 "in overloaded package ":
2968 "has no overloaded magic",
2969 SvAMAGIC(left)?
2970 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
2971 SVfARG(&PL_sv_no),
2972 SvAMAGIC(right)?
2973 ",\n\tright argument in overloaded package ":
2974 (flags & AMGf_unary
2975 ? ""
2976 : ",\n\tright argument has no overloaded magic"),
2977 SvAMAGIC(right)?
2978 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
2979 SVfARG(&PL_sv_no)));
bf5522a1 2980 if (use_default_op) {
d66cca07 2981 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 2982 } else {
be2597df 2983 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW
2984 }
2985 return NULL;
2986 }
ee239bfe 2987 force_cpy = force_cpy || assign;
a0d0e21e
LW
2988 }
2989 }
67288365
JL
2990
2991 switch (method) {
2992 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
2993 * operation. we need this to return a value, so that it can be assigned
2994 * later on, in the postpr block (case inc_amg/dec_amg), even if the
2995 * increment or decrement was itself called in void context */
2996 case inc_amg:
2997 if (off == add_amg)
2998 force_scalar = 1;
2999 break;
3000 case dec_amg:
3001 if (off == subtr_amg)
3002 force_scalar = 1;
3003 break;
3004 /* in these cases, we're calling an assignment variant of an operator
3005 * (+= rather than +, for instance). regardless of whether it's a
3006 * fallback or not, it always has to return a value, which will be
3007 * assigned to the proper variable later */
3008 case add_amg:
3009 case subtr_amg:
3010 case mult_amg:
3011 case div_amg:
3012 case modulo_amg:
3013 case pow_amg:
3014 case lshift_amg:
3015 case rshift_amg:
3016 case repeat_amg:
3017 case concat_amg:
3018 case band_amg:
3019 case bor_amg:
3020 case bxor_amg:
3021 if (assign)
3022 force_scalar = 1;
3023 break;
3024 /* the copy constructor always needs to return a value */
3025 case copy_amg:
3026 force_scalar = 1;
3027 break;
3028 /* because of the way these are implemented (they don't perform the
3029 * dereferencing themselves, they return a reference that perl then
3030 * dereferences later), they always have to be in scalar context */
3031 case to_sv_amg:
3032 case to_av_amg:
3033 case to_hv_amg:
3034 case to_gv_amg:
3035 case to_cv_amg:
3036 force_scalar = 1;
3037 break;
3038 /* these don't have an op of their own; they're triggered by their parent
3039 * op, so the context there isn't meaningful ('$a and foo()' in void
3040 * context still needs to pass scalar context on to $a's bool overload) */
3041 case bool__amg:
3042 case numer_amg:
3043 case string_amg:
3044 force_scalar = 1;
3045 break;
3046 }
3047
497b47a8 3048#ifdef DEBUGGING
a0d0e21e 3049 if (!notfound) {
497b47a8 3050 DEBUG_o(Perl_deb(aTHX_
d66cca07 3051 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH
3052 AMG_id2name(off),
3053 method+assignshift==off? "" :
a0288114 3054 " (initially \"",
497b47a8
JH
3055 method+assignshift==off? "" :
3056 AMG_id2name(method+assignshift),
a0288114 3057 method+assignshift==off? "" : "\")",
497b47a8
JH
3058 flags & AMGf_unary? "" :
3059 lr==1 ? " for right argument": " for left argument",
3060 flags & AMGf_unary? " for argument" : "",
d66cca07 3061 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3062 fl? ",\n\tassignment variant used": "") );
ee239bfe 3063 }
497b47a8 3064#endif
748a9306
LW
3065 /* Since we use shallow copy during assignment, we need
3066 * to dublicate the contents, probably calling user-supplied
3067 * version of copy operator
3068 */
ee239bfe
IZ
3069 /* We need to copy in following cases:
3070 * a) Assignment form was called.
3071 * assignshift==1, assign==T, method + 1 == off
3072 * b) Increment or decrement, called directly.
3073 * assignshift==0, assign==0, method + 0 == off
3074 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3075 * assignshift==0, assign==T,
ee239bfe
IZ
3076 * force_cpy == T
3077 * d) Increment or decrement, translated to nomethod.
b267980d 3078 * assignshift==0, assign==0,
ee239bfe
IZ
3079 * force_cpy == T
3080 * e) Assignment form translated to nomethod.
3081 * assignshift==1, assign==T, method + 1 != off
3082 * force_cpy == T
3083 */
3084 /* off is method, method+assignshift, or a result of opcode substitution.
3085 * In the latter case assignshift==0, so only notfound case is important.
3086 */
73512201 3087 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3088 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3089 || force_cpy) )
6f1401dc 3090 {
1b38c28e
NC
3091 /* newSVsv does not behave as advertised, so we copy missing
3092 * information by hand */
3093 SV *tmpRef = SvRV(left);
3094 SV *rv_copy;
31d632c3 3095 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
3096 SvRV_set(left, rv_copy);
3097 SvSETMAGIC(left);
e7881358 3098 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3099 }
6f1401dc
DM
3100 }
3101
a0d0e21e
LW
3102 {
3103 dSP;
3104 BINOP myop;
3105 SV* res;
b7787f18 3106 const bool oldcatch = CATCH_GET;
67288365
JL
3107 I32 oldmark, nret;
3108 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3109
54310121 3110 CATCH_SET(TRUE);
a0d0e21e
LW
3111 Zero(&myop, 1, BINOP);
3112 myop.op_last = (OP *) &myop;
b37c2d43 3113 myop.op_next = NULL;
67288365
JL
3114 myop.op_flags = OPf_STACKED;
3115
3116 switch (gimme) {
3117 case G_VOID:
3118 myop.op_flags |= OPf_WANT_VOID;
3119 break;
3120 case G_ARRAY:
3121 if (flags & AMGf_want_list) {
3122 myop.op_flags |= OPf_WANT_LIST;
3123 break;
3124 }
3125 /* FALLTHROUGH */
3126 default:
3127 myop.op_flags |= OPf_WANT_SCALAR;
3128 break;
3129 }
a0d0e21e 3130
e788e7d3 3131 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3132 ENTER;
462e5cf6 3133 SAVEOP();
533c011a 3134 PL_op = (OP *) &myop;
3280af22 3135 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3136 PL_op->op_private |= OPpENTERSUB_DB;
a0d0e21e 3137 PUTBACK;
897d3989 3138 Perl_pp_pushmark(aTHX);
a0d0e21e 3139
924508f0 3140 EXTEND(SP, notfound + 5);
a0d0e21e
LW
3141 PUSHs(lr>0? right: left);
3142 PUSHs(lr>0? left: right);
3280af22 3143 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3144 if (notfound) {
59cd0e26
NC
3145 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3146 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3147 }
ad64d0ec 3148 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3149 PUTBACK;
67288365 3150 oldmark = TOPMARK;
a0d0e21e 3151
139d0ce6 3152 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3153 CALLRUNOPS(aTHX);
a0d0e21e
LW
3154 LEAVE;
3155 SPAGAIN;
67288365
JL
3156 nret = SP - (PL_stack_base + oldmark);
3157
3158 switch (gimme) {
3159 case G_VOID:
3160 /* returning NULL has another meaning, and we check the context
3161 * at the call site too, so this can be differentiated from the
3162 * scalar case */
3163 res = &PL_sv_undef;
3164 SP = PL_stack_base + oldmark;
3165 break;
3166 case G_ARRAY: {
3167 if (flags & AMGf_want_list) {
3168 res = sv_2mortal((SV *)newAV());
3169 av_extend((AV *)res, nret);
3170 while (nret--)
3171 av_store((AV *)res, nret, POPs);
3172 break;
3173 }
3174 /* FALLTHROUGH */
3175 }
3176 default:
3177 res = POPs;
3178 break;
3179 }
a0d0e21e 3180
ebafeae7 3181 PUTBACK;
d3acc0f7 3182 POPSTACK;
54310121 3183 CATCH_SET(oldcatch);
a0d0e21e 3184
a0d0e21e 3185 if (postpr) {
b7787f18 3186 int ans;
a0d0e21e
LW
3187 switch (method) {
3188 case le_amg:
3189 case sle_amg:
3190 ans=SvIV(res)<=0; break;
3191 case lt_amg:
3192 case slt_amg:
3193 ans=SvIV(res)<0; break;
3194 case ge_amg:
3195 case sge_amg:
3196 ans=SvIV(res)>=0; break;
3197 case gt_amg:
3198 case sgt_amg:
3199 ans=SvIV(res)>0; break;
3200 case eq_amg:
3201 case seq_amg:
3202 ans=SvIV(res)==0; break;
3203 case ne_amg:
3204 case sne_amg:
3205 ans=SvIV(res)!=0; break;
3206 case inc_amg:
3207 case dec_amg:
bbce6d69 3208 SvSetSV(left,res); return left;
dc437b57 3209 case not_amg:
fe7ac86a 3210 ans=!SvTRUE(res); break;
b7787f18
AL
3211 default:
3212 ans=0; break;
a0d0e21e 3213 }
54310121 3214 return boolSV(ans);
748a9306
LW
3215 } else if (method==copy_amg) {
3216 if (!SvROK(res)) {
cea2e8a9 3217 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
3218 }
3219 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
3220 } else {
3221 return res;
3222 }
3223 }
3224}
c9d5ac95 3225
f5c1e807
NC
3226void
3227Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3228{
3229 dVAR;
acda4c6a 3230 U32 hash;
f5c1e807 3231
7918f24d 3232 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3233
acda4c6a
NC
3234 if (len > I32_MAX)
3235 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3236
ae8cc45f
NC
3237 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3238 unshare_hek(GvNAME_HEK(gv));
3239 }
3240
acda4c6a 3241 PERL_HASH(hash, name, len);
c60dbbc3 3242 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC
3243}
3244
66610fdd 3245/*
f7461760
Z
3246=for apidoc gv_try_downgrade
3247
2867cdbc
Z
3248If the typeglob C<gv> can be expressed more succinctly, by having
3249something other than a real GV in its place in the stash, replace it
3250with the optimised form. Basic requirements for this are that C<gv>
3251is a real typeglob, is sufficiently ordinary, and is only referenced
3252from its package. This function is meant to be used when a GV has been
3253looked up in part to see what was there, causing upgrading, but based
3254on what was found it turns out that the real GV isn't required after all.
3255
3256If C<gv> is a completely empty typeglob, it is deleted from the stash.
3257
3258If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3259sub, the typeglob is replaced with a scalar-reference placeholder that
3260more compactly represents the same thing.
f7461760
Z
3261
3262=cut
3263*/
3264
3265void
3266Perl_gv_try_downgrade(pTHX_ GV *gv)
3267{
3268 HV *stash;
3269 CV *cv;
3270 HEK *namehek;
3271 SV **gvp;
3272 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC
3273
3274 /* XXX Why and where does this leave dangling pointers during global
3275 destruction? */
627364f1 3276 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3277
2867cdbc 3278 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3279 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3280 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3281 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3282 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3283 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3284 return;
803f2748
DM
3285 if (SvMAGICAL(gv)) {
3286 MAGIC *mg;
3287 /* only backref magic is allowed */
3288 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3289 return;
3290 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3291 if (mg->mg_type != PERL_MAGIC_backref)
3292 return;
3293 }
3294 }
2867cdbc
Z
3295 cv = GvCV(gv);
3296 if (!cv) {
3297 HEK *gvnhek = GvNAME_HEK(gv);
3298 (void)hv_delete(stash, HEK_KEY(gvnhek),
3299 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
3300 } else if (GvMULTI(gv) && cv &&
f7461760
Z
3301 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3302 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3303 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3304 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3305 (namehek = GvNAME_HEK(gv)) &&
3306 (gvp = hv_fetch(stash, HEK_KEY(namehek),
3307 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
3308 *gvp == (SV*)gv) {
3309 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3310 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z
3311 SvREFCNT(gv) = 0;
3312 sv_clear((SV*)gv);
3313 SvREFCNT(gv) = 1;
70e5f2b5 3314 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
f7461760
Z
3315 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3316 STRUCT_OFFSET(XPVIV, xiv_iv));
3317 SvRV_set(gv, value);
3318 }
3319}
3320
4aaa4757
FC
3321#include "XSUB.h"
3322
3323static void
3324core_xsub(pTHX_ CV* cv)
3325{
3326 Perl_croak(aTHX_
3327 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3328 );
3329}
3330
f7461760 3331/*
66610fdd
RGS
3332 * Local variables:
3333 * c-indentation-style: bsd
3334 * c-basic-offset: 4
14d04a33 3335 * indent-tabs-mode: nil
66610fdd
RGS
3336 * End:
3337 *
14d04a33 3338 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3339 */