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Fix crash when lex subs are used for overload
[perl5.git] / gv.c
CommitLineData
a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW
20 */
21
ccfc67b7
JH
22/*
23=head1 GV Functions
166f8a29
DM
24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH
32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
8261f8eb 37#include "overload.c"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a
AL
41static const char S_autoload[] = "AUTOLOAD";
42static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 43
c69033f2 44GV *
d5713896 45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13be902c
FC
49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
53 && SvTYPE((const SV *)gv) != SVt_PVLV
54 )
55 ) {
bb85b28a
NC
56 const char *what;
57 if (type == SVt_PVIO) {
58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
bb85b28a
NC
64 } else if (type == SVt_PVHV) {
65 what = "hash";
66 } else {
67 what = type == SVt_PVAV ? "array" : "scalar";
68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896
NC
72
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
bb85b28a
NC
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
d5713896
NC
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
d5713896 83 if (!*where)
e17aed30 84 {
d5713896 85 *where = newSV_type(type);
e17aed30
FC
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
89 }
79072805
LW
90 return gv;
91}
92
93GV *
864dbfa3 94Perl_gv_fetchfile(pTHX_ const char *name)
79072805 95{
7918f24d 96 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC
97 return gv_fetchfile_flags(name, strlen(name), 0);
98}
99
100GV *
101Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
102 const U32 flags)
103{
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW
107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC
110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS
116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS
120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC
122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
5a9a79a4 132 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
43e4250a 133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
53d95988
CS
134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW
136 return gv;
137}
138
62d55b22
NC
139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
145NULL.
146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d 153 PERL_ARGS_ASSERT_GV_CONST_SV;
23491f1d 154 PERL_UNUSED_CONTEXT;
7918f24d 155
62d55b22
NC
156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
6f1b3ab0 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
62d55b22
NC
159}
160
12816592
NC
161GP *
162Perl_newGP(pTHX_ GV *const gv)
163{
164 GP *gp;
19bad673 165 U32 hash;
19bad673
NC
166 const char *file;
167 STRLEN len;
2639089b 168#ifndef USE_ITHREADS
6b352265 169 GV *filegv;
2639089b 170#endif
c2587955 171 dVAR;
19bad673 172
7918f24d 173 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD
174 Newxz(gp, 1, GP);
175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
176#ifndef PERL_DONT_CREATE_GVSV
177 gp->gp_sv = newSV(0);
178#endif
7918f24d 179
c947bc1d
FC
180 /* PL_curcop may be null here. E.g.,
181 INIT { bless {} and exit }
182 frees INIT before looking up DESTROY (and creating *DESTROY)
183 */
2639089b
DD
184 if (PL_curcop) {
185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 186#ifdef USE_ITHREADS
2639089b
DD
187 if (CopFILE(PL_curcop)) {
188 file = CopFILE(PL_curcop);
189 len = strlen(file);
190 }
2639089b 191#else
cb0d3385
FC
192 filegv = CopFILEGV(PL_curcop);
193 if (filegv) {
194 file = GvNAME(filegv)+2;
195 len = GvNAMELEN(filegv)-2;
196 }
6e314d4f 197#endif
cb0d3385
FC
198 else goto no_file;
199 }
200 else {
201 no_file:
19bad673
NC
202 file = "";
203 len = 0;
204 }
f4890806
NC
205
206 PERL_HASH(hash, file, len);
f4890806 207 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC
208 gp->gp_refcnt = 1;
209
210 return gp;
211}
212
803f2748
DM
213/* Assign CvGV(cv) = gv, handling weak references.
214 * See also S_anonymise_cv_maybe */
215
216void
217Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
218{
219 GV * const oldgv = CvGV(cv);
b290562e 220 HEK *hek;
803f2748
DM
221 PERL_ARGS_ASSERT_CVGV_SET;
222
223 if (oldgv == gv)
224 return;
225
226 if (oldgv) {
cfc1e951 227 if (CvCVGV_RC(cv)) {
e7881358 228 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM
229 CvCVGV_RC_off(cv);
230 }
803f2748 231 else {
803f2748
DM
232 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
233 }
234 }
b290562e 235 else if ((hek = CvNAME_HEK(cv))) unshare_hek(hek);
803f2748 236
b290562e 237 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 238 assert(!CvCVGV_RC(cv));
803f2748
DM
239
240 if (!gv)
241 return;
242
c794ca97
DM
243 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
244 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
245 else {
cfc1e951 246 CvCVGV_RC_on(cv);
803f2748
DM
247 SvREFCNT_inc_simple_void_NN(gv);
248 }
803f2748
DM
249}
250
c68d9564
Z
251/* Assign CvSTASH(cv) = st, handling weak references. */
252
253void
254Perl_cvstash_set(pTHX_ CV *cv, HV *st)
255{
256 HV *oldst = CvSTASH(cv);
257 PERL_ARGS_ASSERT_CVSTASH_SET;
258 if (oldst == st)
259 return;
260 if (oldst)
261 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
262 SvANY(cv)->xcv_stash = st;
263 if (st)
264 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
265}
803f2748 266
e1104062
FC
267/*
268=for apidoc gv_init_pvn
269
270Converts a scalar into a typeglob. This is an incoercible typeglob;
271assigning a reference to it will assign to one of its slots, instead of
272overwriting it as happens with typeglobs created by SvSetSV. Converting
273any scalar that is SvOK() may produce unpredictable results and is reserved
274for perl's internal use.
275
276C<gv> is the scalar to be converted.
277
278C<stash> is the parent stash/package, if any.
279
04ec7e59
FC
280C<name> and C<len> give the name. The name must be unqualified;
281that is, it must not include the package name. If C<gv> is a
e1104062
FC
282stash element, it is the caller's responsibility to ensure that the name
283passed to this function matches the name of the element. If it does not
284match, perl's internal bookkeeping will get out of sync.
285
04ec7e59
FC
286C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
287the return value of SvUTF8(sv). It can also take the
288GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC
289seen before (i.e., suppress "Used once" warnings).
290
291=for apidoc gv_init
292
293The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC
294has no flags parameter. If the C<multi> parameter is set, the
295GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC
296
297=for apidoc gv_init_pv
298
299Same as gv_init_pvn(), but takes a nul-terminated string for the name
300instead of separate char * and length parameters.
301
302=for apidoc gv_init_sv
303
304Same as gv_init_pvn(), but takes an SV * for the name instead of separate
305char * and length parameters. C<flags> is currently unused.
306
307=cut
308*/
309
463ee0b2 310void
04ec7e59 311Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF
312{
313 char *namepv;
314 STRLEN namelen;
315 PERL_ARGS_ASSERT_GV_INIT_SV;
316 namepv = SvPV(namesv, namelen);
317 if (SvUTF8(namesv))
318 flags |= SVf_UTF8;
04ec7e59 319 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF
320}
321
322void
04ec7e59 323Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF
324{
325 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 326 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF
327}
328
329void
04ec7e59 330Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 331{
3b6733bf
NC
332 const U32 old_type = SvTYPE(gv);
333 const bool doproto = old_type > SVt_NULL;
f9509170 334 char * const proto = (doproto && SvPOK(gv))
dad95a0a 335 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 336 : NULL;
49a54bbe 337 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 338 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 339 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 340 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 341
e6066781 342 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC
343 assert (!(proto && has_constant));
344
345 if (has_constant) {
5c1f4d79
NC
346 /* The constant has to be a simple scalar type. */
347 switch (SvTYPE(has_constant)) {
5c1f4d79
NC
348 case SVt_PVHV:
349 case SVt_PVCV:
350 case SVt_PVFM:
351 case SVt_PVIO:
352 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
353 sv_reftype(has_constant, 0));
81d52ecd 354
42d0e0b7 355 default: NOOP;
5c1f4d79 356 }
756cb477
NC
357 SvRV_set(gv, NULL);
358 SvROK_off(gv);
359 }
463ee0b2 360
3b6733bf
NC
361
362 if (old_type < SVt_PVGV) {
363 if (old_type >= SVt_PV)
364 SvCUR_set(gv, 0);
ad64d0ec 365 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 366 }
55d729e4
GS
367 if (SvLEN(gv)) {
368 if (proto) {
f880fe2f 369 SvPV_set(gv, NULL);
b162af07 370 SvLEN_set(gv, 0);
55d729e4
GS
371 SvPOK_off(gv);
372 } else
94010e71 373 Safefree(SvPVX_mutable(gv));
55d729e4 374 }
2e5b91de
NC
375 SvIOK_off(gv);
376 isGV_with_GP_on(gv);
12816592 377
c43ae56f 378 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC
379 GvSTASH(gv) = stash;
380 if (stash)
ad64d0ec 381 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 382 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC
383 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
384 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 385 if (doproto) {
e3d2b9e7 386 CV *cv;
756cb477
NC
387 if (has_constant) {
388 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 389 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC
390 /* In case op.c:S_process_special_blocks stole it: */
391 if (!GvCV(gv))
c43ae56f 392 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 393 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC
394 /* If this reference was a copy of another, then the subroutine
395 must have been "imported", by a Perl space assignment to a GV
396 from a reference to CV. */
397 if (exported_constant)
398 GvIMPORTED_CV_on(gv);
186a5ba8 399 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 400 } else {
186a5ba8 401 cv = newSTUB(gv,1);
756cb477 402 }
55d729e4 403 if (proto) {
e3d2b9e7 404 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 405 SV_HAS_TRAILING_NUL);
e0260a5b 406 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS
407 }
408 }
463ee0b2
LW
409}
410
76e3520e 411STATIC void
e6066781 412S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 413{
e6066781 414 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 415
a0d0e21e
LW
416 switch (sv_type) {
417 case SVt_PVIO:
418 (void)GvIOn(gv);
419 break;
420 case SVt_PVAV:
421 (void)GvAVn(gv);
422 break;
423 case SVt_PVHV:
424 (void)GvHVn(gv);
425 break;
c69033f2
NC
426#ifdef PERL_DONT_CREATE_GVSV
427 case SVt_NULL:
428 case SVt_PVCV:
429 case SVt_PVFM:
e654831b 430 case SVt_PVGV:
c69033f2
NC
431 break;
432 default:
dbdce04c
NC
433 if(GvSVn(gv)) {
434 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
435 If we just cast GvSVn(gv) to void, it ignores evaluating it for
436 its side effect */
437 }
c69033f2 438#endif
a0d0e21e
LW
439 }
440}
441
0f8d4b5e
FC
442static void core_xsub(pTHX_ CV* cv);
443
444static GV *
445S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 446 const char * const name, const STRLEN len)
0f8d4b5e
FC
447{
448 const int code = keyword(name, len, 1);
449 static const char file[] = __FILE__;
97021f77 450 CV *cv, *oldcompcv = NULL;
0f8d4b5e 451 int opnum = 0;
0f8d4b5e 452 bool ampable = TRUE; /* &{}-able */
97021f77
FC
453 COP *oldcurcop = NULL;
454 yy_parser *oldparser = NULL;
455 I32 oldsavestack_ix = 0;
0f8d4b5e
FC
456
457 assert(gv || stash);
458 assert(name);
0f8d4b5e 459
88b892d8
FC
460 if (!code) return NULL; /* Not a keyword */
461 switch (code < 0 ? -code : code) {
0f8d4b5e 462 /* no support for \&CORE::infix;
d885f758 463 no support for funcs that do not parse like funcs */
88b892d8 464 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 465 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 466 case KEY_default : case KEY_DESTROY:
88b892d8 467 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 468 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 469 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 470 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC
471 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
472 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
473 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 474 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 475 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 476 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 477 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 478 case KEY_state: case KEY_sub :
46bef06f 479 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC
480 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
481 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC
482 return NULL;
483 case KEY_chdir:
eb31eb35 484 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 485 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC
486 case KEY_keys:
487 case KEY_lstat:
488 case KEY_pop:
489 case KEY_push:
490 case KEY_shift:
a99f2ca2 491 case KEY_splice: case KEY_split:
0f8d4b5e
FC
492 case KEY_stat:
493 case KEY_system:
494 case KEY_truncate: case KEY_unlink:
495 case KEY_unshift:
496 case KEY_values:
497 ampable = FALSE;
498 }
499 if (!gv) {
500 gv = (GV *)newSV(0);
501 gv_init(gv, stash, name, len, TRUE);
502 }
7e68c38b 503 GvMULTI_on(gv);
0f8d4b5e
FC
504 if (ampable) {
505 ENTER;
506 oldcurcop = PL_curcop;
507 oldparser = PL_parser;
508 lex_start(NULL, NULL, 0);
509 oldcompcv = PL_compcv;
510 PL_compcv = NULL; /* Prevent start_subparse from setting
511 CvOUTSIDE. */
512 oldsavestack_ix = start_subparse(FALSE,0);
513 cv = PL_compcv;
514 }
515 else {
516 /* Avoid calling newXS, as it calls us, and things start to
517 get hairy. */
518 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
519 GvCV_set(gv,cv);
520 GvCVGEN(gv) = 0;
0f8d4b5e
FC
521 CvISXSUB_on(cv);
522 CvXSUB(cv) = core_xsub;
523 }
524 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
525 from PL_curcop. */
526 (void)gv_fetchfile(file);
527 CvFILE(cv) = (char *)file;
528 /* XXX This is inefficient, as doing things this order causes
529 a prototype check in newATTRSUB. But we have to do
530 it this order as we need an op number before calling
531 new ATTRSUB. */
532 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 533 if (stash)
73c02f15 534 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 535 if (ampable) {
4428fb0e
TC
536#ifdef DEBUGGING
537 CV *orig_cv = cv;
538#endif
0f8d4b5e 539 CvLVALUE_on(cv);
4428fb0e
TC
540 /* newATTRSUB will free the CV and return NULL if we're still
541 compiling after a syntax error */
e8f91c91 542 if ((cv = newATTRSUB_x(
7e68c38b 543 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC
544 NULL,NULL,
545 coresub_op(
546 opnum
547 ? newSVuv((UV)opnum)
548 : newSVpvn(name,len),
549 code, opnum
7e68c38b 550 ),
e8f91c91 551 TRUE
4428fb0e
TC
552 )) != NULL) {
553 assert(GvCV(gv) == orig_cv);
554 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
555 && opnum != OP_UNDEF)
556 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
557 }
0f8d4b5e
FC
558 LEAVE;
559 PL_parser = oldparser;
560 PL_curcop = oldcurcop;
561 PL_compcv = oldcompcv;
562 }
4428fb0e
TC
563 if (cv) {
564 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
565 cv_set_call_checker(
566 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
567 );
568 SvREFCNT_dec(opnumsv);
569 }
570
0f8d4b5e
FC
571 return gv;
572}
573
954c1994 574/*
6c53d59b
FC
575=for apidoc gv_fetchmeth
576
577Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
578
e6919483
BF
579=for apidoc gv_fetchmeth_sv
580
581Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
582of an SV instead of a string/length pair.
583
584=cut
585*/
586
587GV *
588Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
589{
590 char *namepv;
591 STRLEN namelen;
592 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
593 namepv = SvPV(namesv, namelen);
594 if (SvUTF8(namesv))
595 flags |= SVf_UTF8;
596 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
597}
598
599/*
600=for apidoc gv_fetchmeth_pv
601
602Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
603instead of a string/length pair.
604
605=cut
606*/
607
608GV *
609Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
610{
611 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
612 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
613}
614
615/*
616=for apidoc gv_fetchmeth_pvn
954c1994
GS
617
618Returns the glob with the given C<name> and a defined subroutine or
619C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 620accessible via @ISA and UNIVERSAL::.
954c1994
GS
621
622The argument C<level> should be either 0 or -1. If C<level==0>, as a
623side-effect creates a glob with the given C<name> in the given C<stash>
624which in the case of success contains an alias for the subroutine, and sets
e1a479c5 625up caching info for this glob.
954c1994 626
aae43805
FC
627The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
628
629GV_SUPER indicates that we want to look up the method in the superclasses
630of the C<stash>.
e6919483 631
aae43805 632The
954c1994 633GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 634visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 635the GV directly; instead, you should use the method's CV, which can be
b267980d 636obtained from the GV with the C<GvCV> macro.
954c1994
GS
637
638=cut
639*/
640
e1a479c5
BB
641/* NOTE: No support for tied ISA */
642
79072805 643GV *
e6919483 644Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 645{
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 901
cec2d7b1
FC
902These functions grant C<"SUPER"> token
903as a prefix of the method name. Note
954c1994
GS
904that if you want to keep the returned glob for a long time, you need to
905check for it being "AUTOLOAD", since at the later time the call may load a
cec2d7b1
FC
906different subroutine due to $AUTOLOAD changing its value. Use the glob
907created as a side effect to do this.
954c1994 908
cec2d7b1
FC
909These functions have the same side-effects as C<gv_fetchmeth> with
910C<level==0>. The warning against passing the GV returned by
911C<gv_fetchmeth> to C<call_sv> applies 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{
eb578fdb 948 const char *nend;
c445ea15 949 const char *nsplit = NULL;
a0d0e21e 950 GV* gv;
0dae17bd 951 HV* ostash = stash;
c94593d0 952 const char * const origname = name;
ad64d0ec 953 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
954 const U32 autoload = flags & GV_AUTOLOAD;
955 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 956 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 957
44130a26 958 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 959
eff494dd 960 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 961 stash = NULL;
c9bf4021
NC
962 else {
963 /* The only way stash can become NULL later on is if nsplit is set,
964 which in turn means that there is no need for a SVt_PVHV case
965 the error reporting code. */
966 }
b267980d 967
44130a26 968 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 969 if (*nend == '\'') {
a0d0e21e 970 nsplit = nend;
c94593d0
NC
971 name = nend + 1;
972 }
973 else if (*nend == ':' && *(nend + 1) == ':') {
974 nsplit = nend++;
975 name = nend + 1;
976 }
a0d0e21e
LW
977 }
978 if (nsplit) {
7edbdc6b 979 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 980 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC
981 stash = CopSTASH(PL_curcop);
982 flags |= GV_SUPER;
cea2e8a9 983 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 984 origname, HvENAME_get(stash), name) );
4633a7c4 985 }
aae43805
FC
986 else if ((nsplit - origname) >= 7 &&
987 strnEQ(nsplit - 7, "::SUPER", 7)) {
988 /* don't autovifify if ->NoSuchStash::SUPER::method */
989 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
990 if (stash) flags |= GV_SUPER;
991 }
e189a56d 992 else {
af09ea45 993 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 994 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 995 }
0dae17bd 996 ostash = stash;
4633a7c4
LW
997 }
998
14d1dfbd 999 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1000 if (!gv) {
2f6e0fe7 1001 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1002 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1003 else if (autoload)
c8416c26
BF
1004 gv = gv_autoload_pvn(
1005 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1006 );
256d1bb2
NC
1007 if (!gv && do_croak) {
1008 /* Right now this is exclusively for the benefit of S_method_common
1009 in pp_hot.c */
1010 if (stash) {
15e6cdd9
DG
1011 /* If we can't find an IO::File method, it might be a call on
1012 * a filehandle. If IO:File has not been loaded, try to
1013 * require it first instead of croaking */
1014 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1015 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1016 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1017 STR_WITH_LEN("IO/File.pm"), 0,
1018 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1019 ) {
31b05a0f 1020 require_pv("IO/File.pm");
14d1dfbd 1021 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG
1022 if (gv)
1023 return gv;
1024 }
256d1bb2 1025 Perl_croak(aTHX_
b17a0679 1026 "Can't locate object method \"%"UTF8f
d0c0e7dd 1027 "\" via package \"%"HEKf"\"",
b17a0679 1028 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1029 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC
1030 }
1031 else {
ecad31f0 1032 SV* packnamesv;
256d1bb2 1033
256d1bb2 1034 if (nsplit) {
ecad31f0
BF
1035 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1036 SVs_TEMP | is_utf8);
256d1bb2 1037 } else {
017c5e4e 1038 packnamesv = error_report;
256d1bb2
NC
1039 }
1040
1041 Perl_croak(aTHX_
b17a0679
FC
1042 "Can't locate object method \"%"UTF8f
1043 "\" via package \"%"SVf"\""
ecad31f0 1044 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1045 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1046 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1047 }
1048 }
463ee0b2 1049 }
dc848c6f 1050 else if (autoload) {
9d4ba2ae 1051 CV* const cv = GvCV(gv);
09280a33
CS
1052 if (!CvROOT(cv) && !CvXSUB(cv)) {
1053 GV* stubgv;
1054 GV* autogv;
1055
8bfda0d7 1056 if (CvANON(cv) || !CvGV(cv))
09280a33
CS
1057 stubgv = gv;
1058 else {
1059 stubgv = CvGV(cv);
1060 if (GvCV(stubgv) != cv) /* orphaned import */
1061 stubgv = gv;
1062 }
c8416c26
BF
1063 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1064 GvNAME(stubgv), GvNAMELEN(stubgv),
1065 GV_AUTOLOAD_ISMETHOD
1066 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1067 if (autogv)
1068 gv = autogv;
1069 }
1070 }
44a8e56a
PP
1071
1072 return gv;
1073}
1074
1075GV*
0eeb01b9 1076Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1077{
1078 char *namepv;
1079 STRLEN namelen;
0fe84f7c 1080 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1081 namepv = SvPV(namesv, namelen);
1082 if (SvUTF8(namesv))
1083 flags |= SVf_UTF8;
0eeb01b9 1084 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1085}
1086
1087GV*
0eeb01b9 1088Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1089{
0fe84f7c 1090 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1091 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1092}
1093
1094GV*
0eeb01b9 1095Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1096{
44a8e56a
PP
1097 GV* gv;
1098 CV* cv;
1099 HV* varstash;
1100 GV* vargv;
1101 SV* varsv;
c8416c26
BF
1102 SV *packname = NULL;
1103 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1104
0fe84f7c 1105 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1106
7edbdc6b 1107 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1108 return NULL;
0dae17bd
GS
1109 if (stash) {
1110 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1111 STRLEN packname_len = 0;
1112 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1113 packname = newSVpvn_flags(packname_ptr, packname_len,
1114 SVs_TEMP | SvUTF8(stash));
5c284bb0 1115 stash = NULL;
0dae17bd 1116 }
c8416c26
BF
1117 else
1118 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1119 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1120 }
257dc59d
FC
1121 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1122 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1123 return NULL;
dc848c6f
PP
1124 cv = GvCV(gv);
1125
adb5a9ae 1126 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1127 return NULL;
ed850460 1128
dc848c6f
PP
1129 /*
1130 * Inheriting AUTOLOAD for non-methods works ... for now.
1131 */
0eeb01b9
FC
1132 if (
1133 !(flags & GV_AUTOLOAD_ISMETHOD)
1134 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1135 )
d1d15184 1136 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC
1137 "Use of inherited AUTOLOAD for non-method %"SVf
1138 "::%"UTF8f"() is deprecated",
ecad31f0 1139 SVfARG(packname),
b17a0679 1140 UTF8fARG(is_utf8, len, name));
44a8e56a 1141
aed2304a 1142 if (CvISXSUB(cv)) {
bb619f37
FC
1143 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1144 * and split that value on the last '::', pass along the same data
1145 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC
1146 *
1147 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1148 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC
1149 * type. Since SvPVX has been documented as returning the sub name
1150 * for a long time, but not as returning the prototype, we have
1151 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1152 * elsewhere.
1153 *
1154 * We put the prototype in the same allocated buffer, but after
1155 * the sub name. The SvPOK flag indicates the presence of a proto-
1156 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1157 * If both flags are on, then SvLEN is used to indicate the end of
1158 * the prototype (artificially lower than what is actually allo-
1159 * cated), at the risk of having to reallocate a few bytes unneces-
1160 * sarily--but that should happen very rarely, if ever.
1161 *
1162 * We use SvUTF8 for both prototypes and sub names, so if one is
1163 * UTF8, the other must be upgraded.
adb5a9ae 1164 */
c68d9564 1165 CvSTASH_set(cv, stash);
8fa6a409 1166 if (SvPOK(cv)) { /* Ouch! */
e7881358 1167 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC
1168 STRLEN ulen;
1169 const char *proto = CvPROTO(cv);
1170 assert(proto);
1171 if (SvUTF8(cv))
1172 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1173 ulen = SvCUR(tmpsv);
1174 SvCUR(tmpsv)++; /* include null in string */
1175 sv_catpvn_flags(
1176 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1177 );
1178 SvTEMP_on(tmpsv); /* Allow theft */
1179 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1180 SvTEMP_off(tmpsv);
e7881358 1181 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC
1182 SvLEN(cv) = SvCUR(cv) + 1;
1183 SvCUR(cv) = ulen;
1184 }
1185 else {
1186 sv_setpvn((SV *)cv, name, len);
1187 SvPOK_off(cv);
1188 if (is_utf8)
c8416c26 1189 SvUTF8_on(cv);
8fa6a409
FC
1190 else SvUTF8_off(cv);
1191 }
1192 CvAUTOLOAD_on(cv);
adb5a9ae 1193 }
adb5a9ae 1194
44a8e56a
PP
1195 /*
1196 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1197 * The subroutine's original name may not be "AUTOLOAD", so we don't
1198 * use that, but for lack of anything better we will use the sub's
1199 * original package to look up $AUTOLOAD.
1200 */
18691622 1201 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1202 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1203 ENTER;
1204
c69033f2 1205 if (!isGV(vargv)) {
04ec7e59 1206 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1207#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1208 GvSV(vargv) = newSV(0);
c69033f2
NC
1209#endif
1210 }
3d35f11b 1211 LEAVE;
e203899d 1212 varsv = GvSVn(vargv);
4bac9ae4
CS
1213 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1214 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1215 sv_setsv(varsv, packname);
396482e1 1216 sv_catpvs(varsv, "::");
d40bf27b
NC
1217 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1218 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC
1219 sv_catpvn_flags(
1220 varsv, name, len,
5bcd1ef4 1221 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1222 );
c8416c26
BF
1223 if (is_utf8)
1224 SvUTF8_on(varsv);
a0d0e21e
LW
1225 return gv;
1226}
1227
44a2ac75
YO
1228
1229/* require_tie_mod() internal routine for requiring a module
486ec47a 1230 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO
1231 *
1232 * The "gv" parameter should be the glob.
45cbc99a
RGS
1233 * "varpv" holds the name of the var, used for error messages.
1234 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1235 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS
1236 * are working reasonably close to as expected.
1237 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1238 * For the protection of $! to work (it is set by this routine)
1239 * the sv slot must already be magicalized.
d2c93421 1240 */
44a2ac75
YO
1241STATIC HV*
1242S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1243{
da51bb9b 1244 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1245
7918f24d
NC
1246 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1247
0ea03996 1248 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS
1249 SV *module = newSVsv(namesv);
1250 char varname = *varpv; /* varpv might be clobbered by load_module,
1251 so save it. For the moment it's always
1252 a single char. */
b82b06b8 1253 const char type = varname == '[' ? '$' : '%';
61bac25c 1254#ifdef DEBUGGING
d2c93421 1255 dSP;
61bac25c 1256#endif
d2c93421 1257 ENTER;
600beb2e 1258 SAVEFREESV(namesv);
44a2ac75 1259 if ( flags & 1 )
45cbc99a
RGS
1260 save_scalar(gv);
1261 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1262 assert(sp == PL_stack_sp);
da51bb9b 1263 stash = gv_stashsv(namesv, 0);
44a2ac75 1264 if (!stash)
b82b06b8
FC
1265 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1266 type, varname, SVfARG(namesv));
45cbc99a 1267 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC
1268 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1269 type, varname, SVfARG(namesv), methpv);
600beb2e 1270 LEAVE;
d2c93421 1271 }
e7881358 1272 else SvREFCNT_dec_NN(namesv);
44a2ac75 1273 return stash;
d2c93421
RH
1274}
1275
954c1994
GS
1276/*
1277=for apidoc gv_stashpv
1278
da51bb9b 1279Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1280determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1281
1282=cut
1283*/
1284
a0d0e21e 1285HV*
864dbfa3 1286Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1287{
7918f24d 1288 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1289 return gv_stashpvn(name, strlen(name), create);
1290}
1291
bc96cb06
SH
1292/*
1293=for apidoc gv_stashpvn
1294
da51bb9b
NC
1295Returns a pointer to the stash for a specified package. The C<namelen>
1296parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1297to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1298created if it does not already exist. If the package does not exist and
1299C<flags> is 0 (or any other setting that does not create packages) then NULL
1300is returned.
1301
566a4718
YO
1302Flags may be one of:
1303
1304 GV_ADD
1305 SVf_UTF8
1306 GV_NOADD_NOINIT
1307 GV_NOINIT
1308 GV_NOEXPAND
1309 GV_ADDMG
1310
1311The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06
SH
1312
1313=cut
1314*/
1315
4e7ebec5 1316PERL_STATIC_INLINE HV*
1317S_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1318{
0cea0058 1319 char smallbuf[128];
46fc3d4c 1320 char *tmpbuf;
a0d0e21e
LW
1321 HV *stash;
1322 GV *tmpgv;
add0ecde 1323 U32 tmplen = namelen + 2;
dc437b57 1324
7918f24d
NC
1325 PERL_ARGS_ASSERT_GV_STASHPVN;
1326
add0ecde 1327 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1328 tmpbuf = smallbuf;
1329 else
add0ecde
VP
1330 Newx(tmpbuf, tmplen, char);
1331 Copy(name, tmpbuf, namelen, char);
1332 tmpbuf[namelen] = ':';
1333 tmpbuf[namelen+1] = ':';
1334 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1335 if (tmpbuf != smallbuf)
1336 Safefree(tmpbuf);
a0d0e21e 1337 if (!tmpgv)
da51bb9b 1338 return NULL;
a0d0e21e 1339 stash = GvHV(tmpgv);
1f656fcf 1340 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1341 assert(stash);
1f656fcf 1342 if (!HvNAME_get(stash)) {
0be4d16f 1343 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1344
1345 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1346 /* If the containing stash has multiple effective
1347 names, see that this one gets them, too. */
1348 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1349 mro_package_moved(stash, NULL, tmpgv, 1);
1350 }
a0d0e21e 1351 return stash;
463ee0b2
LW
1352}
1353
4e7ebec5 1354HV*
1355Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1356{
1357 HV* stash;
1358 const HE* const he = (const HE *)hv_common(
1359 PL_stashcache, NULL, name, namelen,
1360 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1361 );
1362 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1363 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1364
1365 stash = S_stashpvn(aTHX_ name, namelen, flags);
1366 if (stash && namelen) {
1367 SV* const ref = newSViv(PTR2IV(stash));
1368 hv_store(PL_stashcache, name,
1369 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1370 }
1371 return stash;
1372}
1373
954c1994
GS
1374/*
1375=for apidoc gv_stashsv
1376
da51bb9b 1377Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994
GS
1378
1379=cut
1380*/
1381
a0d0e21e 1382HV*
da51bb9b 1383Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1384{
dc437b57 1385 STRLEN len;
9d4ba2ae 1386 const char * const ptr = SvPV_const(sv,len);
7918f24d
NC
1387
1388 PERL_ARGS_ASSERT_GV_STASHSV;
1389
0be4d16f 1390 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
a0d0e21e
LW
1391}
1392
1393
463ee0b2 1394GV *
fe9845cc 1395Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1396 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1397 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1398}
1399
1400GV *
fe9845cc 1401Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1402 STRLEN len;
77cb3b01
FC
1403 const char * const nambeg =
1404 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1405 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1406 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1407}
1408
90aeefb4 1409PERL_STATIC_INLINE void
290a1700 1410S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1411{
1412 AV* av;
1413
1414 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1415
1416 av = GvAVn(gv);
1417 GvMULTI_on(gv);
1418 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1419 NULL, 0);
ad7cce9f
FR
1420}
1421
90aeefb4
BF
1422/* This function grabs name and tries to split a stash and glob
1423 * from its contents. TODO better description, comments
1424 *
1425 * If the function returns TRUE and 'name == name_end', then
1426 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1427 */
1428PERL_STATIC_INLINE bool
1429S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1430 STRLEN *len, const char *nambeg, STRLEN full_len,
1431 const U32 is_utf8, const I32 add)
1432{
1433 const char *name_cursor;
1434 const char *const name_end = nambeg + full_len;
1435 const char *const name_em1 = name_end - 1;
1436
1437 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1438
1439 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1440 /* accidental stringify on a GV? */
1441 (*name)++;
1442 }
1443
1444 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1445 if (name_cursor < name_em1 &&
1446 ((*name_cursor == ':' && name_cursor[1] == ':')
1447 || *name_cursor == '\''))
1448 {
1449 if (!*stash)
1450 *stash = PL_defstash;
1451 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1452 return FALSE;
1453
1454 *len = name_cursor - *name;
1455 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1456 const char *key;
1457 GV**gvp;
1458 if (*name_cursor == ':') {
1459 key = *name;
1460 *len += 2;
1461 }
1462 else {
1463 char *tmpbuf;
1464 Newx(tmpbuf, *len+2, char);
1465 Copy(*name, tmpbuf, *len, char);
1466 tmpbuf[(*len)++] = ':';
1467 tmpbuf[(*len)++] = ':';
1468 key = tmpbuf;
1469 }
c161da64 1470 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF
1471 *gv = gvp ? *gvp : NULL;
1472 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1473 if (SvTYPE(*gv) != SVt_PVGV)
1474 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1475 else
1476 GvMULTI_on(*gv);
1477 }
1478 if (key != *name)
1479 Safefree(key);
1480 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1481 return FALSE;
1482
1483 if (!(*stash = GvHV(*gv))) {
1484 *stash = GvHV(*gv) = newHV();
1485 if (!HvNAME_get(*stash)) {
1486 if (GvSTASH(*gv) == PL_defstash && *len == 6
1487 && strnEQ(*name, "CORE", 4))
1488 hv_name_set(*stash, "CORE", 4, 0);
1489 else
1490 hv_name_set(
1491 *stash, nambeg, name_cursor-nambeg, is_utf8
1492 );
1493 /* If the containing stash has multiple effective
1494 names, see that this one gets them, too. */
1495 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1496 mro_package_moved(*stash, NULL, *gv, 1);
1497 }
1498 }
1499 else if (!HvNAME_get(*stash))
1500 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1501 }
1502
1503 if (*name_cursor == ':')
1504 name_cursor++;
1505 *name = name_cursor+1;
1506 if (*name == name_end) {
1507 if (!*gv)
1508 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1509 return TRUE;
1510 }
1511 }
1512 }
1513 *len = name_cursor - *name;
1514 return TRUE;
1515}
1516
536d1a88 1517/* Checks if an unqualified name is in the main stash */
90aeefb4 1518PERL_STATIC_INLINE bool
536d1a88 1519S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1520{
536d1a88 1521 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1522
90aeefb4 1523 /* If it's an alphanumeric variable */
536d1a88 1524 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF
1525 /* Some "normal" variables are always in main::,
1526 * like INC or STDOUT.
1527 */
1528 switch (len) {
1529 case 1:
1530 if (*name == '_')
536d1a88 1531 return TRUE;
90aeefb4
BF
1532 break;
1533 case 3:
1534 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1535 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1536 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1537 return TRUE;
90aeefb4
BF
1538 break;
1539 case 4:
1540 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1541 && name[3] == 'V')
536d1a88 1542 return TRUE;
90aeefb4
BF
1543 break;
1544 case 5:
1545 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1546 && name[3] == 'I' && name[4] == 'N')
536d1a88 1547 return TRUE;
90aeefb4
BF
1548 break;
1549 case 6:
1550 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1551 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1552 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1553 return TRUE;
90aeefb4
BF
1554 break;
1555 case 7:
1556 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1557 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1558 && name[6] == 'T')
536d1a88 1559 return TRUE;
90aeefb4
BF
1560 break;
1561 }
536d1a88
BF
1562 }
1563 /* *{""}, or a special variable like $@ */
1564 else
1565 return TRUE;
1566
1567 return FALSE;
1568}
1569
1570
1571/* This function is called if parse_gv_stash_name() failed to
1572 * find a stash, or if GV_NOTQUAL or an empty name was passed
1573 * to gv_fetchpvn_flags.
1574 *
1575 * It returns FALSE if the default stash can't be found nor created,
1576 * which might happen during global destruction.
1577 */
1578PERL_STATIC_INLINE bool
1579S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1580 const U32 is_utf8, const I32 add,
1581 const svtype sv_type)
1582{
1583 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1584
1585 /* No stash in name, so see how we can default */
90aeefb4 1586
536d1a88
BF
1587 if ( gv_is_in_main(name, len, is_utf8) ) {
1588 *stash = PL_defstash;
1589 }
1590 else {
1591 if (IN_PERL_COMPILETIME) {
90aeefb4
BF
1592 *stash = PL_curstash;
1593 if (add && (PL_hints & HINT_STRICT_VARS) &&
1594 sv_type != SVt_PVCV &&
1595 sv_type != SVt_PVGV &&
1596 sv_type != SVt_PVFM &&
1597 sv_type != SVt_PVIO &&
1598 !(len == 1 && sv_type == SVt_PV &&
1599 (*name == 'a' || *name == 'b')) )
1600 {
c161da64 1601 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF
1602 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1603 SvTYPE(*gvp) != SVt_PVGV)
1604 {
1605 *stash = NULL;
1606 }
1607 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1608 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1609 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1610 {
1611 /* diag_listed_as: Variable "%s" is not imported%s */
1612 Perl_ck_warner_d(
1613 aTHX_ packWARN(WARN_MISC),
1614 "Variable \"%c%"UTF8f"\" is not imported",
1615 sv_type == SVt_PVAV ? '@' :
1616 sv_type == SVt_PVHV ? '%' : '$',
1617 UTF8fARG(is_utf8, len, name));
1618 if (GvCVu(*gvp))
1619 Perl_ck_warner_d(
1620 aTHX_ packWARN(WARN_MISC),
1621 "\t(Did you mean &%"UTF8f" instead?)\n",
1622 UTF8fARG(is_utf8, len, name)
1623 );
1624 *stash = NULL;
1625 }
1626 }
1627 }
1628 else {
1629 /* Use the current op's stash */
1630 *stash = CopSTASH(PL_curcop);
1631 }
1632 }
90aeefb4
BF
1633
1634 if (!*stash) {
1635 if (add && !PL_in_clean_all) {
1636 SV * const err = Perl_mess(aTHX_
1637 "Global symbol \"%s%"UTF8f
1638 "\" requires explicit package name",
1639 (sv_type == SVt_PV ? "$"
1640 : sv_type == SVt_PVAV ? "@"
1641 : sv_type == SVt_PVHV ? "%"
1642 : ""), UTF8fARG(is_utf8, len, name));
1643 GV *gv;
1644 if (is_utf8)
1645 SvUTF8_on(err);
1646 qerror(err);
cd164bf8
BF
1647 /* To maintain the output of errors after the strict exception
1648 * above, and to keep compat with older releases, rather than
1649 * placing the variables in the pad, we place
1650 * them in the <none>:: stash.
1651 */
90aeefb4
BF
1652 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1653 if (!gv) {
1654 /* symbol table under destruction */
1655 return FALSE;
1656 }
1657 *stash = GvHV(gv);
1658 }
1659 else
1660 return FALSE;
1661 }
1662
1663 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1664 return FALSE;
1665
1666 return TRUE;
1667}
1668
930867a8
BF
1669/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1670 * a new GV.
1671 * Note that it does not insert the GV into the stash prior to
1672 * magicalization, which some variables require need in order
1673 * to work (like $[, %+, %-, %!), so callers must take care of
1674 * that beforehand.
1675 *
1676 * The return value has a specific meaning for gv_fetchpvn_flags:
1677 * If it returns true, and the gv is empty, it indicates that its
1678 * refcount should be decreased.
1679 */
1680PERL_STATIC_INLINE bool
1681S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1682 bool addmg, const svtype sv_type)
79072805 1683{
960b831f 1684 SSize_t paren;
79072805 1685
930867a8 1686 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1687
44428a46 1688 if (stash != PL_defstash) { /* not the main stash */
ea238638 1689 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC
1690 and VERSION. All the others apply only to the main stash or to
1691 CORE (which is checked right after this). */
ea238638 1692 if (len) {
b464bac0 1693 const char * const name2 = name + 1;
cc4c2da6 1694 switch (*name) {
cc4c2da6
NC
1695 case 'E':
1696 if (strnEQ(name2, "XPORT", 5))
1697 GvMULTI_on(gv);
1698 break;
1699 case 'I':
44428a46 1700 if (strEQ(name2, "SA"))
290a1700 1701 gv_magicalize_isa(gv);
cc4c2da6 1702 break;
44428a46
FC
1703 case 'V':
1704 if (strEQ(name2, "ERSION"))
1705 GvMULTI_on(gv);
1706 break;
ea238638
FC
1707 case 'a':
1708 case 'b':
1709 if (len == 1 && sv_type == SVt_PV)
1710 GvMULTI_on(gv);
924ba076 1711 /* FALLTHROUGH */
4aaa4757
FC
1712 default:
1713 goto try_core;
1714 }
930867a8 1715 return addmg;
4aaa4757
FC
1716 }
1717 try_core:
1718 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1719 /* Avoid null warning: */
1720 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC
1721 if (strnEQ(stashname, "CORE", 4))
1722 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC
1723 }
1724 }
1725 else if (len > 1) {
1726#ifndef EBCDIC
1727 if (*name > 'V' ) {
1728 NOOP;
1729 /* Nothing else to do.
1730 The compiler will probably turn the switch statement into a
1731 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW
1732 the common case of lower case variable names. (On EBCDIC
1733 platforms, we can't just do:
1734 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1735 because cases like '\027' in the switch statement below are
1736 C1 (non-ASCII) controls on those platforms, so the remapping
1737 would make them larger than 'V')
1738 */
44428a46
FC
1739 } else
1740#endif
1741 {
1742 const char * const name2 = name + 1;
1743 switch (*name) {
1744 case 'A':
1745 if (strEQ(name2, "RGV")) {
1746 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1747 }
1748 else if (strEQ(name2, "RGVOUT")) {
1749 GvMULTI_on(gv);
1750 }
1751 break;
1752 case 'E':
1753 if (strnEQ(name2, "XPORT", 5))
1754 GvMULTI_on(gv);
1755 break;
1756 case 'I':
1757 if (strEQ(name2, "SA")) {
290a1700 1758 gv_magicalize_isa(gv);
44428a46
FC
1759 }
1760 break;
cc4c2da6
NC
1761 case 'S':
1762 if (strEQ(name2, "IG")) {
1763 HV *hv;
1764 I32 i;
d525a7b2
NC
1765 if (!PL_psig_name) {
1766 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1767 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1768 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1769 } else {
1770 /* I think that the only way to get here is to re-use an
1771 embedded perl interpreter, where the previous
1772 use didn't clean up fully because
1773 PL_perl_destruct_level was 0. I'm not sure that we
1774 "support" that, in that I suspect in that scenario
1775 there are sufficient other garbage values left in the
1776 interpreter structure that something else will crash
1777 before we get here. I suspect that this is one of
1778 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1779 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1780 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
1781 }
1782 GvMULTI_on(gv);
1783 hv = GvHVn(gv);
a0714e2c 1784 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1785 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1786 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
1787 if (init)
1788 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
1789 }
1790 }
1791 break;
1792 case 'V':
1793 if (strEQ(name2, "ERSION"))
1794 GvMULTI_on(gv);
1795 break;
e5218da5
GA
1796 case '\003': /* $^CHILD_ERROR_NATIVE */
1797 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1798 goto magicalize;
1799 break;
cc4c2da6
NC
1800 case '\005': /* $^ENCODING */
1801 if (strEQ(name2, "NCODING"))
1802 goto magicalize;
1803 break;
9ebf26ad
FR
1804 case '\007': /* $^GLOBAL_PHASE */
1805 if (strEQ(name2, "LOBAL_PHASE"))
1806 goto ro_magicalize;
1807 break;
8561ea1d
FC
1808 case '\014': /* $^LAST_FH */
1809 if (strEQ(name2, "AST_FH"))
1810 goto ro_magicalize;
1811 break;
cde0cee5 1812 case '\015': /* $^MATCH */
960b831f
NC
1813 if (strEQ(name2, "ATCH")) {
1814 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1815 goto storeparen;
1816 }
66230c86 1817 break;
cc4c2da6
NC
1818 case '\017': /* $^OPEN */
1819 if (strEQ(name2, "PEN"))
1820 goto magicalize;
1821 break;
cde0cee5 1822 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC
1823 if (strEQ(name2, "REMATCH")) {
1824 paren = RX_BUFF_IDX_CARET_PREMATCH;
1825 goto storeparen;
1826 }
1827 if (strEQ(name2, "OSTMATCH")) {
1828 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1829 goto storeparen;
1830 }
9ebf26ad 1831 break;
cc4c2da6
NC
1832 case '\024': /* ${^TAINT} */
1833 if (strEQ(name2, "AINT"))
1834 goto ro_magicalize;
1835 break;
7cebcbc0 1836 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1837 if (strEQ(name2, "NICODE"))
cc4c2da6 1838 goto ro_magicalize;
a0288114 1839 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1840 goto ro_magicalize;
e07ea26a
NC
1841 if (strEQ(name2, "TF8CACHE"))
1842 goto magicalize;
cc4c2da6
NC
1843 break;
1844 case '\027': /* $^WARNING_BITS */
1845 if (strEQ(name2, "ARNING_BITS"))
1846 goto magicalize;
1847 break;
1848 case '1':
1849 case '2':
1850 case '3':
1851 case '4':
1852 case '5':
1853 case '6':
1854 case '7':
1855 case '8':
1856 case '9':
85e6fe83 1857 {
2fdbfb4d
AB
1858 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1859 this test */
1860 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC
1861 const char *end = name + len;
1862 while (--end > name) {
930867a8
BF
1863 if (!isDIGIT(*end))
1864 return addmg;
cc4c2da6 1865 }
99944878 1866 paren = grok_atou(name, NULL);
960b831f 1867 goto storeparen;
1d7c1841 1868 }
dc437b57 1869 }
93a17b20 1870 }
392db708
NC
1871 } else {
1872 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1873 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1874 switch (*name) {
6361f656 1875 case '&': /* $& */
960b831f
NC
1876 paren = RX_BUFF_IDX_FULLMATCH;
1877 goto sawampersand;
6361f656 1878 case '`': /* $` */
960b831f
NC
1879 paren = RX_BUFF_IDX_PREMATCH;
1880 goto sawampersand;
6361f656 1881 case '\'': /* $' */
960b831f
NC
1882 paren = RX_BUFF_IDX_POSTMATCH;
1883 sawampersand:
1a904fc8 1884#ifdef PERL_SAWAMPERSAND
a289ef89 1885 if (!(
cc4c2da6
NC
1886 sv_type == SVt_PVAV ||
1887 sv_type == SVt_PVHV ||
1888 sv_type == SVt_PVCV ||
1889 sv_type == SVt_PVFM ||
1890 sv_type == SVt_PVIO
d3b97530
DM
1891 )) { PL_sawampersand |=
1892 (*name == '`')
1893 ? SAWAMPERSAND_LEFT
1894 : (*name == '&')
1895 ? SAWAMPERSAND_MIDDLE
1896 : SAWAMPERSAND_RIGHT;
1897 }
1a904fc8 1898#endif
960b831f 1899 goto storeparen;
e91d8259
NC
1900 case '1': /* $1 */
1901 case '2': /* $2 */
1902 case '3': /* $3 */
1903 case '4': /* $4 */
1904 case '5': /* $5 */
1905 case '6': /* $6 */
1906 case '7': /* $7 */
1907 case '8': /* $8 */
1908 case '9': /* $9 */
960b831f
NC
1909 paren = *name - '0';
1910
1911 storeparen:
e91d8259
NC
1912 /* Flag the capture variables with a NULL mg_ptr
1913 Use mg_len for the array index to lookup. */
960b831f 1914 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 1915 break;
cc4c2da6 1916
6361f656 1917 case ':': /* $: */
c69033f2 1918 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
1919 goto magicalize;
1920
6361f656 1921 case '?': /* $? */
ff0cee69 1922#ifdef COMPLEX_STATUS
c69033f2 1923 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1924#endif
cc4c2da6 1925 goto magicalize;
ff0cee69 1926
6361f656 1927 case '!': /* $! */
67261566 1928 GvMULTI_on(gv);
44a2ac75 1929 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1930
ad64d0ec 1931 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1932
44a2ac75 1933 /* magicalization must be done before require_tie_mod is called */
67261566 1934 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 1935 {
44a2ac75 1936 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 1937 addmg = FALSE;
ffdb8bcd 1938 }
d2c93421 1939
6cef1e77 1940 break;
6361f656
AB
1941 case '-': /* $- */
1942 case '+': /* $+ */
44a2ac75
YO
1943 GvMULTI_on(gv); /* no used once warnings here */
1944 {
44a2ac75 1945 AV* const av = GvAVn(gv);
ad64d0ec 1946 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 1947
ad64d0ec
NC
1948 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1949 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 1950 if (avc)
44a2ac75 1951 SvREADONLY_on(GvSVn(gv));
44a2ac75 1952 SvREADONLY_on(av);
67261566
YO
1953
1954 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 1955 {
192b9cd1 1956 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 1957 addmg = FALSE;
213084e4 1958 }
67261566 1959
80305961 1960 break;
cc4c2da6 1961 }
6361f656
AB
1962 case '*': /* $* */
1963 case '#': /* $# */
9b387841 1964 if (sv_type == SVt_PV)
4f650b80 1965 /* diag_listed_as: $* is no longer supported */
9b387841 1966 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 1967 "$%c is no longer supported", *name);
8ae1fe26 1968 break;
b3ca2e83
NC
1969 case '\010': /* $^H */
1970 {
1971 HV *const hv = GvHVn(gv);
1972 hv_magic(hv, NULL, PERL_MAGIC_hints);
1973 }
1974 goto magicalize;
b82b06b8 1975 case '[': /* $[ */
7d69d4a6 1976 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 1977 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 1978 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 1979 addmg = FALSE;
b82b06b8 1980 }
7d69d4a6 1981 else goto magicalize;
b82b06b8 1982 break;
cc4c2da6 1983 case '\023': /* $^S */
2fdbfb4d
AB
1984 ro_magicalize:
1985 SvREADONLY_on(GvSVn(gv));
924ba076 1986 /* FALLTHROUGH */
6361f656 1987 case '0': /* $0 */
6361f656
AB
1988 case '^': /* $^ */
1989 case '~': /* $~ */
1990 case '=': /* $= */
1991 case '%': /* $% */
1992 case '.': /* $. */
1993 case '(': /* $( */
1994 case ')': /* $) */
1995 case '<': /* $< */
1996 case '>': /* $> */
1997 case '\\': /* $\ */
1998 case '/': /* $/ */
4505a31f 1999 case '|': /* $| */
9cdac2a2 2000 case '$': /* $$ */
cc4c2da6
NC
2001 case '\001': /* $^A */
2002 case '\003': /* $^C */
2003 case '\004': /* $^D */
2004 case '\005': /* $^E */
2005 case '\006': /* $^F */
cc4c2da6
NC
2006 case '\011': /* $^I, NOT \t in EBCDIC */
2007 case '\016': /* $^N */
2008 case '\017': /* $^O */
2009 case '\020': /* $^P */
2010 case '\024': /* $^T */
2011 case '\027': /* $^W */
2012 magicalize:
ad64d0ec 2013 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2014 break;
e521374c 2015
cc4c2da6 2016 case '\014': /* $^L */
76f68e9b 2017 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2018 break;
6361f656 2019 case ';': /* $; */
76f68e9b 2020 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2021 break;
6361f656 2022 case ']': /* $] */
cc4c2da6 2023 {
3638bf15 2024 SV * const sv = GvSV(gv);
d7aa5382 2025 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2026 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
2027 GvSV(gv) = vnumify(PL_patchlevel);
2028 SvREADONLY_on(GvSV(gv));
2029 SvREFCNT_dec(sv);
93a17b20
LW
2030 }
2031 break;
cc4c2da6
NC
2032 case '\026': /* $^V */
2033 {
3638bf15 2034 SV * const sv = GvSV(gv);
f9be5ac8
DM
2035 GvSV(gv) = new_version(PL_patchlevel);
2036 SvREADONLY_on(GvSV(gv));
2037 SvREFCNT_dec(sv);
16070b82
GS
2038 }
2039 break;
ea238638
FC
2040 case 'a':
2041 case 'b':
dc3e91f6 2042 if (sv_type == SVt_PV)
ea238638 2043 GvMULTI_on(gv);
cc4c2da6 2044 }
79072805 2045 }
930867a8
BF
2046
2047 return addmg;
71c35c05
BF
2048}
2049
070dc475
BF
2050/* This function is called when the stash already holds the GV of the magic
2051 * variable we're looking for, but we need to check that it has the correct
2052 * kind of magic. For example, if someone first uses $! and then %!, the
2053 * latter would end up here, and we add the Errno tie to the HASH slot of
2054 * the *! glob.
2055 */
2056PERL_STATIC_INLINE void
2057S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2058{
2059 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2060
2061 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2062 if (*name == '!')
2063 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2064 else if (*name == '-' || *name == '+')
2065 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2066 } else if (sv_type == SVt_PV) {
2067 if (*name == '*' || *name == '#') {
2068 /* diag_listed_as: $* is no longer supported */
2069 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2070 WARN_SYNTAX),
2071 "$%c is no longer supported", *name);
2072 }
2073 }
2074 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2075 switch (*name) {
2076 case '[':
2077 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2078 break;
2079#ifdef PERL_SAWAMPERSAND
2080 case '`':
2081 PL_sawampersand |= SAWAMPERSAND_LEFT;
2082 (void)GvSVn(gv);
2083 break;
2084 case '&':
2085 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2086 (void)GvSVn(gv);
2087 break;
2088 case '\'':
2089 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2090 (void)GvSVn(gv);
2091 break;
2092#endif
2093 }
2094 }
2095}
2096
71c35c05
BF
2097GV *
2098Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2099 const svtype sv_type)
2100{
71c35c05
BF
2101 const char *name = nambeg;
2102 GV *gv = NULL;
2103 GV**gvp;
2104 STRLEN len;
2105 HV *stash = NULL;
2106 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2107 const I32 no_expand = flags & GV_NOEXPAND;
2108 const I32 add = flags & ~GV_NOADD_MASK;
2109 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2110 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF
2111 const char *const name_end = nambeg + full_len;
2112 U32 faking_it;
2113
2114 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2115
2116 /* If we have GV_NOTQUAL, the caller promised that
2117 * there is no stash, so we can skip the check.
2118 * Similarly if full_len is 0, since then we're
2119 * dealing with something like *{""} or ""->foo()
2120 */
2121 if ((flags & GV_NOTQUAL) || !full_len) {
2122 len = full_len;
2123 }
2124 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2125 if (name == name_end) return gv;
2126 }
2127 else {
2128 return NULL;
2129 }
2130
2131 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2132 return NULL;
2133 }
2134
2135 /* By this point we should have a stash and a name */
c161da64 2136 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF
2137 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2138 if (addmg) gv = (GV *)newSV(0);
2139 else return NULL;
2140 }
2141 else gv = *gvp, addmg = 0;
2142 /* From this point on, addmg means gv has not been inserted in the
2143 symtab yet. */
2144
2145 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF
2146 /* The GV already exists, so return it, but check if we need to do
2147 * anything else with it before that.
2148 */
71c35c05 2149 if (add) {
c002ae9a
BF
2150 /* This is the heuristic that handles if a variable triggers the
2151 * 'used only once' warning. If there's already a GV in the stash
2152 * with this name, then we assume that the variable has been used
2153 * before and turn its MULTI flag on.
2154 * It's a heuristic because it can easily be "tricked", like with
2155 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2156 * not warning about $main::foo being used just once
2157 */
71c35c05
BF
2158 GvMULTI_on(gv);
2159 gv_init_svtype(gv, sv_type);
2160 /* You reach this path once the typeglob has already been created,
2161 either by the same or a different sigil. If this path didn't
2162 exist, then (say) referencing $! first, and %! second would
2163 mean that %! was not handled correctly. */
2164 if (len == 1 && stash == PL_defstash) {
070dc475 2165 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF
2166 }
2167 else if (len == 3 && sv_type == SVt_PVAV
2168 && strnEQ(name, "ISA", 3)
2169 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2170 gv_magicalize_isa(gv);
2171 }
2172 return gv;
2173 } else if (no_init) {
2174 assert(!addmg);
2175 return gv;
c002ae9a
BF
2176 }
2177 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2178 * don't expand it to a glob. This is an optimization so that things
2179 * copying constants over, like Exporter, don't have to be rewritten
2180 * to take into account that you can store more than just globs in
2181 * stashes.
2182 */
2183 else if (no_expand && SvROK(gv)) {
71c35c05
BF
2184 assert(!addmg);
2185 return gv;
2186 }
2187
2188 /* Adding a new symbol.
2189 Unless of course there was already something non-GV here, in which case
2190 we want to behave as if there was always a GV here, containing some sort
2191 of subroutine.
2192 Otherwise we run the risk of creating things like GvIO, which can cause
2193 subtle bugs. eg the one that tripped up SQL::Translator */
2194
2195 faking_it = SvOK(gv);
2196
2197 if (add & GV_ADDWARN)
2198 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2199 "Had to create %"UTF8f" unexpectedly",
2200 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2201 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2202
9e5de6ae 2203 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF
2204 GvMULTI_on(gv) ;
2205
930867a8
BF
2206 /* First, store the gv in the symtab if we're adding magic,
2207 * but only for non-empty GVs
2208 */
2209#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2210 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2211
2212 if ( addmg && !GvEMPTY(gv) ) {
2213 (void)hv_store(stash,name,len,(SV *)gv,0);
2214 }
2215
71c35c05 2216 /* set up magic where warranted */
930867a8
BF
2217 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2218 /* See 23496c6 */
2219 if (GvEMPTY(gv)) {
2220 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2221 /* The GV was and still is "empty", except that now
2222 * it has the magic flags turned on, so we want it
2223 * stored in the symtab.
2224 */
2225 (void)hv_store(stash,name,len,(SV *)gv,0);
2226 }
2227 else {
2228 /* Most likely the temporary GV created above */
2229 SvREFCNT_dec_NN(gv);
2230 gv = NULL;
2231 }
2232 }
2233 }
71c35c05 2234
e6066781 2235 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2236 return gv;
79072805
LW
2237}
2238
2239void
35a4481c 2240Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2241{
ed60a868 2242 const char *name;
35a4481c 2243 const HV * const hv = GvSTASH(gv);
7918f24d
NC
2244
2245 PERL_ARGS_ASSERT_GV_FULLNAME4;
2246
666ea192 2247 sv_setpv(sv, prefix ? prefix : "");
a0288114 2248
52a6327b 2249 if (hv && (name = HvNAME(hv))) {
ed60a868
FC
2250 const STRLEN len = HvNAMELEN(hv);
2251 if (keepmain || strnNE(name, "main", len)) {
2252 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2253 sv_catpvs(sv,"::");
ed60a868 2254 }
43693395 2255 }
ed60a868 2256 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2257 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2258}
2259
2260void
35a4481c 2261Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2262{
099be4f1 2263 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2264
2265 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2266
46c461b5 2267 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2268}
2269
39a65960
DM
2270
2271/* recursively scan a stash and any nested stashes looking for entries
2272 * that need the "only used once" warning raised
2273 */
2274
79072805 2275void
51da40ed 2276Perl_gv_check(pTHX_ HV *stash)
79072805 2277{
eb578fdb 2278 I32 i;
463ee0b2 2279
7918f24d
NC
2280 PERL_ARGS_ASSERT_GV_CHECK;
2281
8990e307
LW
2282 if (!HvARRAY(stash))
2283 return;
90754377
DM
2284
2285 assert(SvOOK(stash));
90754377 2286
a0d0e21e 2287 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2288 const HE *entry;
90754377 2289 /* mark stash is being scanned, to avoid recursing */
339441ef 2290 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2291 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2292 GV *gv;
b7787f18 2293 HV *hv;
dc437b57 2294 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2295 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2296 {
90754377
DM
2297 if (hv != PL_defstash && hv != stash
2298 && !(SvOOK(hv)
2299 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2300 )
a0d0e21e
LW
2301 gv_check(hv); /* nested package */
2302 }
ecad31f0
BF
2303 else if ( *HeKEY(entry) != '_'
2304 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2305 const char *file;
159b6efe 2306 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2307 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2308 continue;
1d7c1841 2309 file = GvFILE(gv);
1d7c1841 2310 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC
2311#ifdef USE_ITHREADS
2312 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2313#else
2314 CopFILEGV(PL_curcop)
2315 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2316#endif
9014280d 2317 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC
2318 "Name \"%"HEKf"::%"HEKf
2319 "\" used only once: possible typo",
2320 HEKfARG(HvNAME_HEK(stash)),
2321 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2322 }
79072805 2323 }
339441ef 2324 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW
2325 }
2326}
2327
2328GV *
9cc50d5b 2329Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2330{
9cc50d5b 2331 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2332 assert(!(flags & ~SVf_UTF8));
7918f24d 2333
b17a0679
FC
2334 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2335 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF
2336 (long)PL_gensym++),
2337 GV_ADD, SVt_PVGV);
79072805
LW
2338}
2339
2340/* hopefully this is only called on local symbol table entries */
2341
2342GP*
864dbfa3 2343Perl_gp_ref(pTHX_ GP *gp)
79072805 2344{
1d7c1841 2345 if (!gp)
d4c19fe8 2346 return NULL;
79072805 2347 gp->gp_refcnt++;
44a8e56a
PP
2348 if (gp->gp_cv) {
2349 if (gp->gp_cvgen) {
e1a479c5
BB
2350 /* If the GP they asked for a reference to contains
2351 a method cache entry, clear it first, so that we
2352 don't infect them with our cached entry */
e7881358 2353 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2354 gp->gp_cv = NULL;
44a8e56a
PP
2355 gp->gp_cvgen = 0;
2356 }
44a8e56a 2357 }
79072805 2358 return gp;
79072805
LW
2359}
2360
2361void
864dbfa3 2362Perl_gp_free(pTHX_ GV *gv)
79072805 2363{
79072805 2364 GP* gp;
b0d55c99 2365 int attempts = 100;
79072805 2366
f7877b28 2367 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2368 return;
f248d071 2369 if (gp->gp_refcnt == 0) {
9b387841
NC
2370 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2371 "Attempt to free unreferenced glob pointers"
2372 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2373 return;
2374 }
4571f4a7 2375 if (gp->gp_refcnt > 1) {
bc81b34d 2376 borrowed:
748a9306
LW
2377 if (gp->gp_egv == gv)
2378 gp->gp_egv = 0;
4571f4a7 2379 gp->gp_refcnt--;
c43ae56f 2380 GvGP_set(gv, NULL);
79072805 2381 return;
748a9306 2382 }
79072805 2383
b0d55c99
FC
2384 while (1) {
2385 /* Copy and null out all the glob slots, so destructors do not see
2386 freed SVs. */
2387 HEK * const file_hek = gp->gp_file_hek;
2388 SV * const sv = gp->gp_sv;
2389 AV * const av = gp->gp_av;
2390 HV * const hv = gp->gp_hv;
2391 IO * const io = gp->gp_io;
2392 CV * const cv = gp->gp_cv;
2393 CV * const form = gp->gp_form;
2394
2395 gp->gp_file_hek = NULL;
2396 gp->gp_sv = NULL;
2397 gp->gp_av = NULL;
2398 gp->gp_hv = NULL;
2399 gp->gp_io = NULL;
2400 gp->gp_cv = NULL;
2401 gp->gp_form = NULL;
2402
2403 if (file_hek)
2404 unshare_hek(file_hek);
2405
2406 SvREFCNT_dec(sv);
2407 SvREFCNT_dec(av);
2408 /* FIXME - another reference loop GV -> symtab -> GV ?
2409 Somehow gp->gp_hv can end up pointing at freed garbage. */
2410 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2411 const HEK *hvname_hek = HvNAME_HEK(hv);
10bafe90 2412 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", HEKfARG(hvname_hek)));
c2242065 2413 if (PL_stashcache && hvname_hek)
0ca9877d 2414 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
b0d55c99
FC
2415 SvREFCNT_dec(hv);
2416 }
2417 SvREFCNT_dec(io);
2418 SvREFCNT_dec(cv);
2419 SvREFCNT_dec(form);
2420
bc81b34d
FC
2421 /* Possibly reallocated by a destructor */
2422 gp = GvGP(gv);
2423
b0d55c99
FC
2424 if (!gp->gp_file_hek
2425 && !gp->gp_sv
2426 && !gp->gp_av
2427 && !gp->gp_hv
2428 && !gp->gp_io
2429 && !gp->gp_cv
2430 && !gp->gp_form) break;
2431
2432 if (--attempts == 0) {
2433 Perl_die(aTHX_
2434 "panic: gp_free failed to free glob pointer - "
2435 "something is repeatedly re-creating entries"
2436 );
2437 }
13207a71 2438 }
748a9306 2439
bc81b34d
FC
2440 /* Possibly incremented by a destructor doing glob assignment */
2441 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2442 Safefree(gp);
c43ae56f 2443 GvGP_set(gv, NULL);
79072805
LW
2444}
2445
d460ef45
NIS
2446int
2447Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2448{
53c1dcc0
AL
2449 AMT * const amtp = (AMT*)mg->mg_ptr;
2450 PERL_UNUSED_ARG(sv);
dd374669 2451
7918f24d
NC
2452 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2453
d460ef45
NIS
2454 if (amtp && AMT_AMAGIC(amtp)) {
2455 int i;
2456 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2457 CV * const cv = amtp->table[i];
b37c2d43 2458 if (cv) {
e7881358 2459 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2460 amtp->table[i] = NULL;
d460ef45
NIS
2461 }
2462 }
2463 }
2464 return 0;
2465}
2466
a0d0e21e 2467/* Updates and caches the CV's */
c3a9a790
RGS
2468/* Returns:
2469 * 1 on success and there is some overload
2470 * 0 if there is no overload
2471 * -1 if some error occurred and it couldn't croak
2472 */
a0d0e21e 2473
c3a9a790 2474int
242f8760 2475Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2476{
ad64d0ec 2477 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2478 AMT amt;
9b439311 2479 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2480 U32 newgen;
a0d0e21e 2481
7918f24d
NC
2482 PERL_ARGS_ASSERT_GV_AMUPDATE;
2483
9b439311 2484 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2485 if (mg) {
2486 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2487 if (amtp->was_ok_sub == newgen) {
8c34e50d 2488 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2489 }
ad64d0ec 2490 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2491 }
a0d0e21e 2492
bfcb3514 2493 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2494
d460ef45 2495 Zero(&amt,1,AMT);
e1a479c5 2496 amt.was_ok_sub = newgen;
a6006777
PP
2497 amt.fallback = AMGfallNO;
2498 amt.flags = 0;
2499
a6006777 2500 {
8c34e50d
FC
2501 int filled = 0;
2502 int i;
3d147ac2
DM
2503 bool deref_seen = 0;
2504
a6006777 2505
3866ea3b 2506 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2507
89ffc314 2508 /* Try to find via inheritance. */
e6919483 2509 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2510 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2511 CV* cv;
89ffc314
IZ
2512
2513 if (!gv)
3866ea3b
FC
2514 {
2515 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2516 goto no_table;
3866ea3b
FC
2517 }
2518#ifdef PERL_DONT_CREATE_GVSV
2519 else if (!sv) {
6f207bd3 2520 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC
2521 }
2522#endif
79c9643d
JL
2523 else if (SvTRUE(sv))
2524 /* don't need to set overloading here because fallback => 1
2525 * is the default setting for classes without overloading */
89ffc314 2526 amt.fallback=AMGfallYES;
79c9643d
JL
2527 else if (SvOK(sv)) {
2528 amt.fallback=AMGfallNEVER;
386a5489 2529 filled = 1;
386a5489 2530 }
79c9643d 2531 else {
386a5489 2532 filled = 1;
386a5489 2533 }
a6006777 2534
3d147ac2 2535 assert(SvOOK(stash));
3d147ac2 2536 /* initially assume the worst */
339441ef 2537 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2538
8c34e50d 2539 for (i = 1; i < NofAMmeth; i++) {
6136c704 2540 const char * const cooky = PL_AMG_names[i];
32251b26 2541 /* Human-readable form, for debugging: */
8c34e50d 2542 const char * const cp = AMG_id2name(i);
d279ab82 2543 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2544
a0288114 2545 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2546 cp, HvNAME_get(stash)) );
611c1e95
IZ
2547 /* don't fill the cache while looking up!
2548 Creation of inheritance stubs in intermediate packages may
2549 conflict with the logic of runtime method substitution.
2550 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2551 then we could have created stubs for "(+0" in A and C too.
2552 But if B overloads "bool", we may want to use it for
2553 numifying instead of C's "+0". */
8c34e50d 2554 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2555 cv = 0;
56117e3e 2556 if (gv && (cv = GvCV(gv)) && CvGV(cv)) {
f0e9f182
FC
2557 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2558 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2559 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2560 && strEQ(hvname, "overload")) {
611c1e95
IZ
2561 /* This is a hack to support autoloading..., while
2562 knowing *which* methods were declared as overloaded. */
44a8e56a 2563 /* GvSV contains the name of the method. */
6136c704 2564 GV *ngv = NULL;
c69033f2 2565 SV *gvsv = GvSV(gv);
a0288114
AL
2566
2567 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2568 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2569 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2570 if (!gvsv || !SvPOK(gvsv)
7f415459 2571 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2572 {
a0288114 2573 /* Can be an import stub (created by "can"). */
242f8760 2574 if (destructing) {
c3a9a790 2575 return -1;
242f8760
RGS
2576 }
2577 else {
d66cca07
BF
2578 const SV * const name = (gvsv && SvPOK(gvsv))
2579 ? gvsv
2580 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2581 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF
2582 Perl_croak(aTHX_ "%s method \"%"SVf256
2583 "\" overloading \"%s\" "\
d0c0e7dd 2584 "in package \"%"HEKf256"\"",
242f8760
RGS
2585 (GvCVGEN(gv) ? "Stub found while resolving"
2586 : "Can't resolve"),
d66cca07 2587 SVfARG(name), cp,
d0c0e7dd 2588 HEKfARG(
d66cca07 2589 HvNAME_HEK(stash)
d0c0e7dd 2590 ));
242f8760 2591 }
44a8e56a 2592 }
dc848c6f 2593 cv = GvCV(gv = ngv);
f0e9f182 2594 }
44a8e56a 2595 }
b464bac0 2596 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2597 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2598 GvNAME(CvGV(cv))) );
2599 filled = 1;
611c1e95 2600 } else if (gv) { /* Autoloaded... */
ea726b52 2601 cv = MUTABLE_CV(gv);
611c1e95 2602 filled = 1;
44a8e56a 2603 }
ea726b52 2604 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM
2605
2606 if (gv) {
2607 switch (i) {
2608 case to_sv_amg:
2609 case to_av_amg:
2610 case to_hv_amg:
2611 case to_gv_amg:
2612 case to_cv_amg:
2613 case nomethod_amg:
2614 deref_seen = 1;
2615 break;
2616 }
2617 }
a0d0e21e 2618 }
3d147ac2 2619 if (!deref_seen)
45479970
DM
2620 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2621 * NB - aux var invalid here, HvARRAY() could have been
2622 * reallocated since it was assigned to */
2623 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2624
a0d0e21e 2625 if (filled) {
a6006777 2626 AMT_AMAGIC_on(&amt);
ad64d0ec 2627 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2628 (char*)&amt, sizeof(AMT));
8c34e50d 2629 return TRUE;
a0d0e21e
LW
2630 }
2631 }
a6006777 2632 /* Here we have no table: */
8c34e50d 2633 no_table:
a6006777 2634 AMT_AMAGIC_off(&amt);
ad64d0ec 2635 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2636 (char*)&amt, sizeof(AMTS));
c3a9a790 2637 return 0;
a0d0e21e
LW
2638}
2639
32251b26
IZ
2640
2641CV*
2642Perl_gv_handler(pTHX_ HV *stash, I32 id)
2643{
3f8f4626 2644 MAGIC *mg;
32251b26 2645 AMT *amtp;
e1a479c5 2646 U32 newgen;
9b439311 2647 struct mro_meta* stash_meta;
32251b26 2648
bfcb3514 2649 if (!stash || !HvNAME_get(stash))
601f1833 2650 return NULL;
e1a479c5 2651
9b439311
BB
2652 stash_meta = HvMROMETA(stash);
2653 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2654
ad64d0ec 2655 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2656 if (!mg) {
2657 do_update:
8c34e50d 2658 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2659 return NULL;
ad64d0ec 2660 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2661 }
a9fd4e40 2662 assert(mg);
32251b26 2663 amtp = (AMT*)mg->mg_ptr;
66978156 2664 if ( amtp->was_ok_sub != newgen )
32251b26 2665 goto do_update;
3ad83ce7 2666 if (AMT_AMAGIC(amtp)) {
b7787f18 2667 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2668 if (ret && isGV(ret)) { /* Autoloading stab */
2669 /* Passing it through may have resulted in a warning
2670 "Inherited AUTOLOAD for a non-method deprecated", since
2671 our caller is going through a function call, not a method call.
2672 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2673 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2674
2675 if (gv && GvCV(gv))
2676 return GvCV(gv);
2677 }
2678 return ret;
2679 }
a0288114 2680
601f1833 2681 return NULL;
32251b26
IZ
2682}
2683
2684
6f1401dc
DM
2685/* Implement tryAMAGICun_MG macro.
2686 Do get magic, then see if the stack arg is overloaded and if so call it.
2687 Flags:
2688 AMGf_set return the arg using SETs rather than assigning to
2689 the targ
2690 AMGf_numeric apply sv_2num to the stack arg.
2691*/
2692
2693bool
2694Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM
2695 dSP;
2696 SV* tmpsv;
2697 SV* const arg = TOPs;
2698
2699 SvGETMAGIC(arg);
2700
9f8bf298
NC
2701 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2702 AMGf_noright | AMGf_unary))) {
6f1401dc
DM
2703 if (flags & AMGf_set) {
2704 SETs(tmpsv);
2705 }
2706 else {
2707 dTARGET;
2708 if (SvPADMY(TARG)) {
2709 sv_setsv(TARG, tmpsv);
2710 SETTARG;
2711 }
2712 else
2713 SETs(tmpsv);
2714 }
2715 PUTBACK;
2716 return TRUE;
2717 }
2718
2719 if ((flags & AMGf_numeric) && SvROK(arg))
2720 *sp = sv_2num(arg);
2721 return FALSE;
2722}
2723
2724
2725/* Implement tryAMAGICbin_MG macro.
2726 Do get magic, then see if the two stack args are overloaded and if so
2727 call it.
2728 Flags:
2729 AMGf_set return the arg using SETs rather than assigning to
2730 the targ
2731 AMGf_assign op may be called as mutator (eg +=)
2732 AMGf_numeric apply sv_2num to the stack arg.
2733*/
2734
2735bool
2736Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM
2737 dSP;
2738 SV* const left = TOPm1s;
2739 SV* const right = TOPs;
2740
2741 SvGETMAGIC(left);
2742 if (left != right)
2743 SvGETMAGIC(right);
2744
2745 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2746 SV * const tmpsv = amagic_call(left, right, method,
2747 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2748 if (tmpsv) {
2749 if (flags & AMGf_set) {
2750 (void)POPs;
2751 SETs(tmpsv);
2752 }
2753 else {
2754 dATARGET;
2755 (void)POPs;
2756 if (opASSIGN || SvPADMY(TARG)) {
2757 sv_setsv(TARG, tmpsv);
2758 SETTARG;
2759 }
2760 else
2761 SETs(tmpsv);
2762 }
2763 PUTBACK;
2764 return TRUE;
2765 }
2766 }
75ea7a12
FC
2767 if(left==right && SvGMAGICAL(left)) {
2768 SV * const left = sv_newmortal();
2769 *(sp-1) = left;
2770 /* Print the uninitialized warning now, so it includes the vari-
2771 able name. */
2772 if (!SvOK(right)) {
2773 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2774 sv_setsv_flags(left, &PL_sv_no, 0);
2775 }
2776 else sv_setsv_flags(left, right, 0);
2777 SvGETMAGIC(right);
2778 }
6f1401dc 2779 if (flags & AMGf_numeric) {
75ea7a12
FC
2780 if (SvROK(TOPm1s))
2781 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
2782 if (SvROK(right))
2783 *sp = sv_2num(right);
2784 }
2785 return FALSE;
2786}
2787
25a9ffce
NC
2788SV *
2789Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2790 SV *tmpsv = NULL;
3d147ac2 2791 HV *stash;
25a9ffce
NC
2792
2793 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2794
3d147ac2
DM
2795 if (!SvAMAGIC(ref))
2796 return ref;
2797 /* return quickly if none of the deref ops are overloaded */
2798 stash = SvSTASH(SvRV(ref));
2799 assert(SvOOK(stash));
2800 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2801 return ref;
2802
2803 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC
2804 AMGf_noright | AMGf_unary))) {
2805 if (!SvROK(tmpsv))
2806 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2807 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2808 /* Bail out if it returns us the same reference. */
2809 return tmpsv;
2810 }
2811 ref = tmpsv;
3d147ac2
DM
2812 if (!SvAMAGIC(ref))
2813 break;
25a9ffce
NC
2814 }
2815 return tmpsv ? tmpsv : ref;
2816}
6f1401dc 2817
8d569291
FC
2818bool
2819Perl_amagic_is_enabled(pTHX_ int method)
2820{
2821 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2822
2823 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2824
2825 if ( !lex_mask || !SvOK(lex_mask) )
2826 /* overloading lexically disabled */
2827 return FALSE;
2828 else if ( lex_mask && SvPOK(lex_mask) ) {
2829 /* we have an entry in the hints hash, check if method has been
2830 * masked by overloading.pm */
2831 STRLEN len;
2832 const int offset = method / 8;
2833 const int bit = method % 8;
2834 char *pv = SvPV(lex_mask, len);
2835
2836 /* Bit set, so this overloading operator is disabled */
2837 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2838 return FALSE;
2839 }
2840 return TRUE;
2841}
2842
a0d0e21e 2843SV*
864dbfa3 2844Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2845{
27da23d5 2846 dVAR;
b267980d 2847 MAGIC *mg;
9c5ffd7c 2848 CV *cv=NULL;
a0d0e21e 2849 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2850 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
2851 int off = 0, off1, lr = 0, notfound = 0;
2852 int postpr = 0, force_cpy = 0;
2853 int assign = AMGf_assign & flags;
2854 const int assignshift = assign ? 1 : 0;
bf5522a1 2855 int use_default_op = 0;
67288365 2856 int force_scalar = 0;
497b47a8
JH
2857#ifdef DEBUGGING
2858 int fl=0;
497b47a8 2859#endif
25716404 2860 HV* stash=NULL;
7918f24d
NC
2861
2862 PERL_ARGS_ASSERT_AMAGIC_CALL;
2863
e46c382e 2864 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2865 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK
2866 }
2867
a0d0e21e 2868 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2869 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2870 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2871 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2872 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2873 : NULL))
b267980d 2874 && ((cv = cvp[off=method+assignshift])
748a9306
LW
2875 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2876 * usual method */
497b47a8
JH
2877 (
2878#ifdef DEBUGGING
2879 fl = 1,
a0288114 2880#endif
497b47a8 2881 cv = cvp[off=method])))) {
a0d0e21e
LW
2882 lr = -1; /* Call method for left argument */
2883 } else {
2884 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2885 int logic;
2886
2887 /* look for substituted methods */
ee239bfe 2888 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
2889 switch (method) {
2890 case inc_amg:
ee239bfe
IZ
2891 force_cpy = 1;
2892 if ((cv = cvp[off=add_ass_amg])
2893 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2894 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2895 }
2896 break;
2897 case dec_amg:
ee239bfe
IZ
2898 force_cpy = 1;
2899 if ((cv = cvp[off = subtr_ass_amg])
2900 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2901 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2902 }
2903 break;
2904 case bool__amg:
2905 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2906 break;
2907 case numer_amg:
2908 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2909 break;
2910 case string_amg:
2911 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2912 break;
b7787f18
AL
2913 case not_amg:
2914 (void)((cv = cvp[off=bool__amg])
2915 || (cv = cvp[off=numer_amg])
2916 || (cv = cvp[off=string_amg]));
2ab54efd
MB
2917 if (cv)
2918 postpr = 1;
b7787f18 2919 break;
748a9306
LW
2920 case copy_amg:
2921 {
76e3520e
GS
2922 /*
2923 * SV* ref causes confusion with the interpreter variable of
2924 * the same name
2925 */
890ce7af 2926 SV* const tmpRef=SvRV(left);
76e3520e 2927 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
2928 /*
2929 * Just to be extra cautious. Maybe in some
2930 * additional cases sv_setsv is safe, too.
2931 */
890ce7af 2932 SV* const newref = newSVsv(tmpRef);
748a9306 2933 SvOBJECT_on(newref);
a1cd65be
FC
2934 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2935 delegate to the stash. */
85fbaab2 2936 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
2937 return newref;
2938 }
2939 }
2940 break;
a0d0e21e 2941 case abs_amg:
b267980d 2942 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2943 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2944 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2945 if (off1==lt_amg) {
890ce7af 2946 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
2947 lt_amg,AMGf_noright);
2948 logic = SvTRUE(lessp);
2949 } else {
890ce7af 2950 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
2951 ncmp_amg,AMGf_noright);
2952 logic = (SvNV(lessp) < 0);
2953 }
2954 if (logic) {
2955 if (off==subtr_amg) {
2956 right = left;
748a9306 2957 left = nullsv;
a0d0e21e
LW
2958 lr = 1;
2959 }
2960 } else {
2961 return left;
2962 }
2963 }
2964 break;
2965 case neg_amg:
155aba94 2966 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW
2967 right = left;
2968 left = sv_2mortal(newSViv(0));
2969 lr = 1;
2970 }
2971 break;
f216259d 2972 case int_amg:
f5284f61 2973 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 2974 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 2975 case regexp_amg:
b267980d
NIS
2976 /* FAIL safe */
2977 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 2978
f5284f61
IZ
2979 case to_sv_amg:
2980 case to_av_amg:
2981 case to_hv_amg:
2982 case to_gv_amg:
2983 case to_cv_amg:
2984 /* FAIL safe */
b267980d 2985 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 2986
a0d0e21e
LW
2987 default:
2988 goto not_found;
2989 }
2990 if (!cv) goto not_found;
2991 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 2992 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 2993 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2994 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2995 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2996 : NULL))
69815d08
RS
2997 && (cv = cvp[off=method])) { /* Method for right
2998 * argument found */
2999 lr=1;
bf5522a1
MB
3000 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3001 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
3002 && !(flags & AMGf_unary)) {
3003 /* We look for substitution for
3004 * comparison operations and
fc36a67e 3005 * concatenation */
a0d0e21e
LW
3006 if (method==concat_amg || method==concat_ass_amg
3007 || method==repeat_amg || method==repeat_ass_amg) {
3008 return NULL; /* Delegate operation to string conversion */
3009 }
3010 off = -1;
3011 switch (method) {
3012 case lt_amg:
3013 case le_amg:
3014 case gt_amg:
3015 case ge_amg:
3016 case eq_amg:
3017 case ne_amg:
2ab54efd
MB
3018 off = ncmp_amg;
3019 break;
a0d0e21e
LW
3020 case slt_amg:
3021 case sle_amg:
3022 case sgt_amg:
3023 case sge_amg:
3024 case seq_amg:
3025 case sne_amg:
2ab54efd
MB
3026 off = scmp_amg;
3027 break;
a0d0e21e 3028 }
bf5522a1
MB
3029 if (off != -1) {
3030 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3031 cv = ocvp[off];
3032 lr = -1;
3033 }
3034 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3035 cv = cvp[off];
3036 lr = 1;
3037 }
3038 }
3039 if (cv)
2ab54efd
MB
3040 postpr = 1;
3041 else
3042 goto not_found;
a0d0e21e 3043 } else {
a6006777 3044 not_found: /* No method found, either report or croak */
b267980d
NIS
3045 switch (method) {
3046 case to_sv_amg:
3047 case to_av_amg:
3048 case to_hv_amg:
3049 case to_gv_amg:
3050 case to_cv_amg:
3051 /* FAIL safe */
3052 return left; /* Delegate operation to standard mechanisms. */
b267980d 3053 }
a0d0e21e
LW
3054 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3055 notfound = 1; lr = -1;
3056 } else if (cvp && (cv=cvp[nomethod_amg])) {
3057 notfound = 1; lr = 1;
bf5522a1
MB
3058 } else if ((use_default_op =
3059 (!ocvp || oamtp->fallback >= AMGfallYES)
3060 && (!cvp || amtp->fallback >= AMGfallYES))
3061 && !DEBUG_o_TEST) {
4cc0ca18
NC
3062 /* Skip generating the "no method found" message. */
3063 return NULL;
a0d0e21e 3064 } else {
46fc3d4c 3065 SV *msg;
774d564b 3066 if (off==-1) off=method;
b267980d 3067 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF
3068 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3069 AMG_id2name(method + assignshift),
3070 (flags & AMGf_unary ? " " : "\n\tleft "),
3071 SvAMAGIC(left)?
3072 "in overloaded package ":
3073 "has no overloaded magic",
3074 SvAMAGIC(left)?
3075 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3076 SVfARG(&PL_sv_no),
3077 SvAMAGIC(right)?
3078 ",\n\tright argument in overloaded package ":
3079 (flags & AMGf_unary
3080 ? ""
3081 : ",\n\tright argument has no overloaded magic"),
3082 SvAMAGIC(right)?
3083 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3084 SVfARG(&PL_sv_no)));
bf5522a1 3085 if (use_default_op) {
d66cca07 3086 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3087 } else {
be2597df 3088 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW
3089 }
3090 return NULL;
3091 }
ee239bfe 3092 force_cpy = force_cpy || assign;
a0d0e21e
LW
3093 }
3094 }
67288365
JL
3095
3096 switch (method) {
3097 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3098 * operation. we need this to return a value, so that it can be assigned
3099 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3100 * increment or decrement was itself called in void context */
3101 case inc_amg:
3102 if (off == add_amg)
3103 force_scalar = 1;
3104 break;
3105 case dec_amg:
3106 if (off == subtr_amg)
3107 force_scalar = 1;
3108 break;
3109 /* in these cases, we're calling an assignment variant of an operator
3110 * (+= rather than +, for instance). regardless of whether it's a
3111 * fallback or not, it always has to return a value, which will be
3112 * assigned to the proper variable later */
3113 case add_amg:
3114 case subtr_amg:
3115 case mult_amg:
3116 case div_amg:
3117 case modulo_amg:
3118 case pow_amg:
3119 case lshift_amg:
3120 case rshift_amg:
3121 case repeat_amg:
3122 case concat_amg:
3123 case band_amg:
3124 case bor_amg:
3125 case bxor_amg:
3126 if (assign)
3127 force_scalar = 1;
3128 break;
3129 /* the copy constructor always needs to return a value */
3130 case copy_amg:
3131 force_scalar = 1;
3132 break;
3133 /* because of the way these are implemented (they don't perform the
3134 * dereferencing themselves, they return a reference that perl then
3135 * dereferences later), they always have to be in scalar context */
3136 case to_sv_amg:
3137 case to_av_amg:
3138 case to_hv_amg:
3139 case to_gv_amg:
3140 case to_cv_amg:
3141 force_scalar = 1;
3142 break;
3143 /* these don't have an op of their own; they're triggered by their parent
3144 * op, so the context there isn't meaningful ('$a and foo()' in void
3145 * context still needs to pass scalar context on to $a's bool overload) */
3146 case bool__amg:
3147 case numer_amg:
3148 case string_amg:
3149 force_scalar = 1;
3150 break;
3151 }
3152
497b47a8 3153#ifdef DEBUGGING
a0d0e21e 3154 if (!notfound) {
497b47a8 3155 DEBUG_o(Perl_deb(aTHX_
d66cca07 3156 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH
3157 AMG_id2name(off),
3158 method+assignshift==off? "" :
a0288114 3159 " (initially \"",
497b47a8
JH
3160 method+assignshift==off? "" :
3161 AMG_id2name(method+assignshift),
a0288114 3162 method+assignshift==off? "" : "\")",
497b47a8
JH
3163 flags & AMGf_unary? "" :
3164 lr==1 ? " for right argument": " for left argument",
3165 flags & AMGf_unary? " for argument" : "",
d66cca07 3166 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3167 fl? ",\n\tassignment variant used": "") );
ee239bfe 3168 }
497b47a8 3169#endif
748a9306
LW
3170 /* Since we use shallow copy during assignment, we need
3171 * to dublicate the contents, probably calling user-supplied
3172 * version of copy operator
3173 */
ee239bfe
IZ
3174 /* We need to copy in following cases:
3175 * a) Assignment form was called.
3176 * assignshift==1, assign==T, method + 1 == off
3177 * b) Increment or decrement, called directly.
3178 * assignshift==0, assign==0, method + 0 == off
3179 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3180 * assignshift==0, assign==T,
ee239bfe
IZ
3181 * force_cpy == T
3182 * d) Increment or decrement, translated to nomethod.
b267980d 3183 * assignshift==0, assign==0,
ee239bfe
IZ
3184 * force_cpy == T
3185 * e) Assignment form translated to nomethod.
3186 * assignshift==1, assign==T, method + 1 != off
3187 * force_cpy == T
3188 */
3189 /* off is method, method+assignshift, or a result of opcode substitution.
3190 * In the latter case assignshift==0, so only notfound case is important.
3191 */
73512201 3192 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3193 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3194 || force_cpy) )
6f1401dc 3195 {
1b38c28e
NC
3196 /* newSVsv does not behave as advertised, so we copy missing
3197 * information by hand */
3198 SV *tmpRef = SvRV(left);
3199 SV *rv_copy;
31d632c3 3200 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
3201 SvRV_set(left, rv_copy);
3202 SvSETMAGIC(left);
e7881358 3203 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3204 }
6f1401dc
DM
3205 }
3206
a0d0e21e
LW
3207 {
3208 dSP;
3209 BINOP myop;
3210 SV* res;
b7787f18 3211 const bool oldcatch = CATCH_GET;
67288365
JL
3212 I32 oldmark, nret;
3213 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3214
54310121 3215 CATCH_SET(TRUE);
a0d0e21e
LW
3216 Zero(&myop, 1, BINOP);
3217 myop.op_last = (OP *) &myop;
b37c2d43 3218 myop.op_next = NULL;
67288365
JL
3219 myop.op_flags = OPf_STACKED;
3220
3221 switch (gimme) {
3222 case G_VOID:
3223 myop.op_flags |= OPf_WANT_VOID;
3224 break;
3225 case G_ARRAY:
3226 if (flags & AMGf_want_list) {
3227 myop.op_flags |= OPf_WANT_LIST;
3228 break;
3229 }
3230 /* FALLTHROUGH */
3231 default:
3232 myop.op_flags |= OPf_WANT_SCALAR;
3233 break;
3234 }
a0d0e21e 3235
e788e7d3 3236 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3237 ENTER;
462e5cf6 3238 SAVEOP();
533c011a 3239 PL_op = (OP *) &myop;
3280af22 3240 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3241 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3242 Perl_pp_pushmark(aTHX);
a0d0e21e 3243
924508f0 3244 EXTEND(SP, notfound + 5);
a0d0e21e
LW
3245 PUSHs(lr>0? right: left);
3246 PUSHs(lr>0? left: right);
3280af22 3247 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3248 if (notfound) {
59cd0e26
NC
3249 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3250 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3251 }
ad64d0ec 3252 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3253 PUTBACK;
67288365 3254 oldmark = TOPMARK;
a0d0e21e 3255
139d0ce6 3256 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3257 CALLRUNOPS(aTHX);
a0d0e21e
LW
3258 LEAVE;
3259 SPAGAIN;
67288365
JL
3260 nret = SP - (PL_stack_base + oldmark);
3261
3262 switch (gimme) {
3263 case G_VOID:
3264 /* returning NULL has another meaning, and we check the context
3265 * at the call site too, so this can be differentiated from the
3266 * scalar case */
3267 res = &PL_sv_undef;
3268 SP = PL_stack_base + oldmark;
3269 break;
3270 case G_ARRAY: {
3271 if (flags & AMGf_want_list) {
3272 res = sv_2mortal((SV *)newAV());
3273 av_extend((AV *)res, nret);
3274 while (nret--)
3275 av_store((AV *)res, nret, POPs);
3276 break;
3277 }
3278 /* FALLTHROUGH */
3279 }
3280 default:
3281 res = POPs;
3282 break;
3283 }
a0d0e21e 3284
ebafeae7 3285 PUTBACK;
d3acc0f7 3286 POPSTACK;
54310121 3287 CATCH_SET(oldcatch);
a0d0e21e 3288
a0d0e21e 3289 if (postpr) {
b7787f18 3290 int ans;
a0d0e21e
LW
3291 switch (method) {
3292 case le_amg:
3293 case sle_amg:
3294 ans=SvIV(res)<=0; break;
3295 case lt_amg:
3296 case slt_amg:
3297 ans=SvIV(res)<0; break;
3298 case ge_amg:
3299 case sge_amg:
3300 ans=SvIV(res)>=0; break;
3301 case gt_amg:
3302 case sgt_amg:
3303 ans=SvIV(res)>0; break;
3304 case eq_amg:
3305 case seq_amg:
3306 ans=SvIV(res)==0; break;
3307 case ne_amg:
3308 case sne_amg:
3309 ans=SvIV(res)!=0; break;
3310 case inc_amg:
3311 case dec_amg:
bbce6d69 3312 SvSetSV(left,res); return left;
dc437b57 3313 case not_amg:
fe7ac86a 3314 ans=!SvTRUE(res); break;
b7787f18
AL
3315 default:
3316 ans=0; break;
a0d0e21e 3317 }
54310121 3318 return boolSV(ans);
748a9306
LW
3319 } else if (method==copy_amg) {
3320 if (!SvROK(res)) {
cea2e8a9 3321 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
3322 }
3323 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
3324 } else {
3325 return res;
3326 }
3327 }
3328}
c9d5ac95 3329
f5c1e807
NC
3330void
3331Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3332{
3333 dVAR;
acda4c6a 3334 U32 hash;
f5c1e807 3335
7918f24d 3336 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3337
acda4c6a
NC
3338 if (len > I32_MAX)
3339 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3340
ae8cc45f
NC
3341 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3342 unshare_hek(GvNAME_HEK(gv));
3343 }
3344
acda4c6a 3345 PERL_HASH(hash, name, len);
c60dbbc3 3346 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC
3347}
3348
66610fdd 3349/*
f7461760
Z
3350=for apidoc gv_try_downgrade
3351
2867cdbc
Z
3352If the typeglob C<gv> can be expressed more succinctly, by having
3353something other than a real GV in its place in the stash, replace it
3354with the optimised form. Basic requirements for this are that C<gv>
3355is a real typeglob, is sufficiently ordinary, and is only referenced
3356from its package. This function is meant to be used when a GV has been
3357looked up in part to see what was there, causing upgrading, but based
3358on what was found it turns out that the real GV isn't required after all.
3359
3360If C<gv> is a completely empty typeglob, it is deleted from the stash.
3361
3362If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3363sub, the typeglob is replaced with a scalar-reference placeholder that
3364more compactly represents the same thing.
f7461760
Z
3365
3366=cut
3367*/
3368
3369void
3370Perl_gv_try_downgrade(pTHX_ GV *gv)
3371{
3372 HV *stash;
3373 CV *cv;
3374 HEK *namehek;
3375 SV **gvp;
3376 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC
3377
3378 /* XXX Why and where does this leave dangling pointers during global
3379 destruction? */
627364f1 3380 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3381
2867cdbc 3382 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3383 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3384 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3385 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3386 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3387 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3388 return;
2be08ad1
FC
3389 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3390 return;
803f2748
DM
3391 if (SvMAGICAL(gv)) {
3392 MAGIC *mg;
3393 /* only backref magic is allowed */
3394 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3395 return;
3396 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3397 if (mg->mg_type != PERL_MAGIC_backref)
3398 return;
3399 }
3400 }
2867cdbc
Z
3401 cv = GvCV(gv);
3402 if (!cv) {
3403 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3404 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3405 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760
Z
3406 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3407 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3408 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3409 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3410 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3411 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z
3412 *gvp == (SV*)gv) {
3413 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3414 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z
3415 SvREFCNT(gv) = 0;
3416 sv_clear((SV*)gv);
3417 SvREFCNT(gv) = 1;
70e5f2b5 3418 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
f7461760
Z
3419 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3420 STRUCT_OFFSET(XPVIV, xiv_iv));
3421 SvRV_set(gv, value);
3422 }
3423}
3424
9e3fb20c
FC
3425GV *
3426Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3427{
3428 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3429 GV * const *gvp;
3430 PERL_ARGS_ASSERT_GV_OVERRIDE;
3431 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3432 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3433 gv = gvp ? *gvp : NULL;
3434 if (gv && !isGV(gv)) {
3435 if (!SvPCS_IMPORTED(gv)) return NULL;
3436 gv_init(gv, PL_globalstash, name, len, 0);
3437 return gv;
3438 }
3439 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3440}
3441
4aaa4757
FC
3442#include "XSUB.h"
3443
3444static void
3445core_xsub(pTHX_ CV* cv)
3446{
3447 Perl_croak(aTHX_
3448 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3449 );
3450}
3451
f7461760 3452/*
66610fdd
RGS
3453 * Local variables:
3454 * c-indentation-style: bsd
3455 * c-basic-offset: 4
14d04a33 3456 * indent-tabs-mode: nil
66610fdd
RGS
3457 * End:
3458 *
14d04a33 3459 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3460 */