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For lexical subs, reify CvGV from CvSTASH and CvNAME_HEK
[perl5.git] / gv.c
CommitLineData
a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW
20 */
21
ccfc67b7
JH
22/*
23=head1 GV Functions
166f8a29
DM
24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH
32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
8261f8eb 37#include "overload.c"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a
AL
41static const char S_autoload[] = "AUTOLOAD";
42static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 43
c69033f2 44GV *
d5713896 45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13be902c
FC
49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
53 && SvTYPE((const SV *)gv) != SVt_PVLV
54 )
55 ) {
bb85b28a
NC
56 const char *what;
57 if (type == SVt_PVIO) {
58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
bb85b28a
NC
64 } else if (type == SVt_PVHV) {
65 what = "hash";
66 } else {
67 what = type == SVt_PVAV ? "array" : "scalar";
68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896
NC
72
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
bb85b28a
NC
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
d5713896
NC
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
d5713896 83 if (!*where)
e17aed30 84 {
d5713896 85 *where = newSV_type(type);
e17aed30
FC
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
89 }
79072805
LW
90 return gv;
91}
92
93GV *
864dbfa3 94Perl_gv_fetchfile(pTHX_ const char *name)
79072805 95{
7918f24d 96 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC
97 return gv_fetchfile_flags(name, strlen(name), 0);
98}
99
100GV *
101Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
102 const U32 flags)
103{
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW
107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC
110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS
116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS
120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC
122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
5a9a79a4 132 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
43e4250a 133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
53d95988
CS
134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW
136 return gv;
137}
138
62d55b22
NC
139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
145NULL.
146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d 153 PERL_ARGS_ASSERT_GV_CONST_SV;
23491f1d 154 PERL_UNUSED_CONTEXT;
7918f24d 155
62d55b22
NC
156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
6f1b3ab0 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
62d55b22
NC
159}
160
12816592
NC
161GP *
162Perl_newGP(pTHX_ GV *const gv)
163{
164 GP *gp;
19bad673 165 U32 hash;
19bad673
NC
166 const char *file;
167 STRLEN len;
2639089b 168#ifndef USE_ITHREADS
6b352265 169 GV *filegv;
2639089b 170#endif
c2587955 171 dVAR;
19bad673 172
7918f24d 173 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD
174 Newxz(gp, 1, GP);
175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
176#ifndef PERL_DONT_CREATE_GVSV
177 gp->gp_sv = newSV(0);
178#endif
7918f24d 179
c947bc1d
FC
180 /* PL_curcop may be null here. E.g.,
181 INIT { bless {} and exit }
182 frees INIT before looking up DESTROY (and creating *DESTROY)
183 */
2639089b
DD
184 if (PL_curcop) {
185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 186#ifdef USE_ITHREADS
2639089b
DD
187 if (CopFILE(PL_curcop)) {
188 file = CopFILE(PL_curcop);
189 len = strlen(file);
190 }
2639089b 191#else
cb0d3385
FC
192 filegv = CopFILEGV(PL_curcop);
193 if (filegv) {
194 file = GvNAME(filegv)+2;
195 len = GvNAMELEN(filegv)-2;
196 }
6e314d4f 197#endif
cb0d3385
FC
198 else goto no_file;
199 }
200 else {
201 no_file:
19bad673
NC
202 file = "";
203 len = 0;
204 }
f4890806
NC
205
206 PERL_HASH(hash, file, len);
f4890806 207 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC
208 gp->gp_refcnt = 1;
209
210 return gp;
211}
212
803f2748
DM
213/* Assign CvGV(cv) = gv, handling weak references.
214 * See also S_anonymise_cv_maybe */
215
216void
217Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
218{
ae77754a 219 GV * const oldgv = CvNAMED(cv) ? NULL : SvANY(cv)->xcv_gv_u.xcv_gv;
b290562e 220 HEK *hek;
803f2748
DM
221 PERL_ARGS_ASSERT_CVGV_SET;
222
223 if (oldgv == gv)
224 return;
225
226 if (oldgv) {
cfc1e951 227 if (CvCVGV_RC(cv)) {
e7881358 228 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM
229 CvCVGV_RC_off(cv);
230 }
803f2748 231 else {
803f2748
DM
232 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
233 }
234 }
db5cc3ee
FC
235 else if ((hek = CvNAME_HEK(cv))) {
236 unshare_hek(hek);
237 CvNAMED_off(cv);
f3feca7a 238 CvLEXICAL_off(cv);
db5cc3ee 239 }
803f2748 240
b290562e 241 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 242 assert(!CvCVGV_RC(cv));
803f2748
DM
243
244 if (!gv)
245 return;
246
c794ca97
DM
247 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
248 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
249 else {
cfc1e951 250 CvCVGV_RC_on(cv);
803f2748
DM
251 SvREFCNT_inc_simple_void_NN(gv);
252 }
803f2748
DM
253}
254
ae77754a
FC
255/* Convert CvSTASH + CvNAME_HEK into a GV. Conceptually, all subs have a
256 GV, but for efficiency that GV may not in fact exist. This function,
257 called by CvGV, reifies it. */
258
259GV *
260Perl_cvgv_from_hek(pTHX_ CV *cv)
261{
262 GV *gv;
263 PERL_ARGS_ASSERT_CVGV_FROM_HEK;
264 assert(SvTYPE(cv) == SVt_PVCV);
265 if (!CvSTASH(cv)) return NULL;
266 ASSUME(CvNAME_HEK(cv));
267 gv = (GV *)newSV(0);
268 gv_init_pvn(gv, CvSTASH(cv), HEK_KEY(CvNAME_HEK(cv)),
269 HEK_LEN(CvNAME_HEK(cv)),
270 SVf_UTF8 * !!HEK_UTF8(CvNAME_HEK(cv)));
271 unshare_hek(CvNAME_HEK(cv));
272 CvNAMED_off(cv);
273 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
274 CvCVGV_RC_on(cv);
275 return gv;
276}
277
c68d9564
Z
278/* Assign CvSTASH(cv) = st, handling weak references. */
279
280void
281Perl_cvstash_set(pTHX_ CV *cv, HV *st)
282{
283 HV *oldst = CvSTASH(cv);
284 PERL_ARGS_ASSERT_CVSTASH_SET;
285 if (oldst == st)
286 return;
287 if (oldst)
288 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
289 SvANY(cv)->xcv_stash = st;
290 if (st)
291 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
292}
803f2748 293
e1104062
FC
294/*
295=for apidoc gv_init_pvn
296
297Converts a scalar into a typeglob. This is an incoercible typeglob;
298assigning a reference to it will assign to one of its slots, instead of
299overwriting it as happens with typeglobs created by SvSetSV. Converting
300any scalar that is SvOK() may produce unpredictable results and is reserved
301for perl's internal use.
302
303C<gv> is the scalar to be converted.
304
305C<stash> is the parent stash/package, if any.
306
04ec7e59
FC
307C<name> and C<len> give the name. The name must be unqualified;
308that is, it must not include the package name. If C<gv> is a
e1104062
FC
309stash element, it is the caller's responsibility to ensure that the name
310passed to this function matches the name of the element. If it does not
311match, perl's internal bookkeeping will get out of sync.
312
04ec7e59
FC
313C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
314the return value of SvUTF8(sv). It can also take the
315GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC
316seen before (i.e., suppress "Used once" warnings).
317
318=for apidoc gv_init
319
320The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC
321has no flags parameter. If the C<multi> parameter is set, the
322GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC
323
324=for apidoc gv_init_pv
325
326Same as gv_init_pvn(), but takes a nul-terminated string for the name
327instead of separate char * and length parameters.
328
329=for apidoc gv_init_sv
330
331Same as gv_init_pvn(), but takes an SV * for the name instead of separate
332char * and length parameters. C<flags> is currently unused.
333
334=cut
335*/
336
463ee0b2 337void
04ec7e59 338Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF
339{
340 char *namepv;
341 STRLEN namelen;
342 PERL_ARGS_ASSERT_GV_INIT_SV;
343 namepv = SvPV(namesv, namelen);
344 if (SvUTF8(namesv))
345 flags |= SVf_UTF8;
04ec7e59 346 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF
347}
348
349void
04ec7e59 350Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF
351{
352 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 353 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF
354}
355
356void
04ec7e59 357Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 358{
3b6733bf
NC
359 const U32 old_type = SvTYPE(gv);
360 const bool doproto = old_type > SVt_NULL;
f9509170 361 char * const proto = (doproto && SvPOK(gv))
dad95a0a 362 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 363 : NULL;
49a54bbe 364 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 365 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 366 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 367 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 368
e6066781 369 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC
370 assert (!(proto && has_constant));
371
372 if (has_constant) {
5c1f4d79
NC
373 /* The constant has to be a simple scalar type. */
374 switch (SvTYPE(has_constant)) {
5c1f4d79
NC
375 case SVt_PVHV:
376 case SVt_PVCV:
377 case SVt_PVFM:
378 case SVt_PVIO:
379 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
380 sv_reftype(has_constant, 0));
81d52ecd 381
42d0e0b7 382 default: NOOP;
5c1f4d79 383 }
756cb477
NC
384 SvRV_set(gv, NULL);
385 SvROK_off(gv);
386 }
463ee0b2 387
3b6733bf
NC
388
389 if (old_type < SVt_PVGV) {
390 if (old_type >= SVt_PV)
391 SvCUR_set(gv, 0);
ad64d0ec 392 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 393 }
55d729e4
GS
394 if (SvLEN(gv)) {
395 if (proto) {
f880fe2f 396 SvPV_set(gv, NULL);
b162af07 397 SvLEN_set(gv, 0);
55d729e4
GS
398 SvPOK_off(gv);
399 } else
94010e71 400 Safefree(SvPVX_mutable(gv));
55d729e4 401 }
2e5b91de
NC
402 SvIOK_off(gv);
403 isGV_with_GP_on(gv);
12816592 404
c43ae56f 405 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC
406 GvSTASH(gv) = stash;
407 if (stash)
ad64d0ec 408 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 409 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC
410 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
411 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 412 if (doproto) {
e3d2b9e7 413 CV *cv;
756cb477
NC
414 if (has_constant) {
415 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 416 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC
417 /* In case op.c:S_process_special_blocks stole it: */
418 if (!GvCV(gv))
c43ae56f 419 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 420 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC
421 /* If this reference was a copy of another, then the subroutine
422 must have been "imported", by a Perl space assignment to a GV
423 from a reference to CV. */
424 if (exported_constant)
425 GvIMPORTED_CV_on(gv);
186a5ba8 426 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 427 } else {
186a5ba8 428 cv = newSTUB(gv,1);
756cb477 429 }
55d729e4 430 if (proto) {
e3d2b9e7 431 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 432 SV_HAS_TRAILING_NUL);
e0260a5b 433 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS
434 }
435 }
463ee0b2
LW
436}
437
76e3520e 438STATIC void
e6066781 439S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 440{
e6066781 441 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 442
a0d0e21e
LW
443 switch (sv_type) {
444 case SVt_PVIO:
445 (void)GvIOn(gv);
446 break;
447 case SVt_PVAV:
448 (void)GvAVn(gv);
449 break;
450 case SVt_PVHV:
451 (void)GvHVn(gv);
452 break;
c69033f2
NC
453#ifdef PERL_DONT_CREATE_GVSV
454 case SVt_NULL:
455 case SVt_PVCV:
456 case SVt_PVFM:
e654831b 457 case SVt_PVGV:
c69033f2
NC
458 break;
459 default:
dbdce04c
NC
460 if(GvSVn(gv)) {
461 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
462 If we just cast GvSVn(gv) to void, it ignores evaluating it for
463 its side effect */
464 }
c69033f2 465#endif
a0d0e21e
LW
466 }
467}
468
0f8d4b5e
FC
469static void core_xsub(pTHX_ CV* cv);
470
471static GV *
472S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 473 const char * const name, const STRLEN len)
0f8d4b5e
FC
474{
475 const int code = keyword(name, len, 1);
476 static const char file[] = __FILE__;
97021f77 477 CV *cv, *oldcompcv = NULL;
0f8d4b5e 478 int opnum = 0;
0f8d4b5e 479 bool ampable = TRUE; /* &{}-able */
97021f77
FC
480 COP *oldcurcop = NULL;
481 yy_parser *oldparser = NULL;
482 I32 oldsavestack_ix = 0;
0f8d4b5e
FC
483
484 assert(gv || stash);
485 assert(name);
0f8d4b5e 486
88b892d8
FC
487 if (!code) return NULL; /* Not a keyword */
488 switch (code < 0 ? -code : code) {
0f8d4b5e 489 /* no support for \&CORE::infix;
d885f758 490 no support for funcs that do not parse like funcs */
88b892d8 491 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 492 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 493 case KEY_default : case KEY_DESTROY:
88b892d8 494 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 495 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 496 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 497 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC
498 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
499 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
500 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 501 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 502 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 503 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 504 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 505 case KEY_state: case KEY_sub :
46bef06f 506 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC
507 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
508 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC
509 return NULL;
510 case KEY_chdir:
eb31eb35 511 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 512 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC
513 case KEY_keys:
514 case KEY_lstat:
515 case KEY_pop:
516 case KEY_push:
517 case KEY_shift:
a99f2ca2 518 case KEY_splice: case KEY_split:
0f8d4b5e
FC
519 case KEY_stat:
520 case KEY_system:
521 case KEY_truncate: case KEY_unlink:
522 case KEY_unshift:
523 case KEY_values:
524 ampable = FALSE;
525 }
526 if (!gv) {
527 gv = (GV *)newSV(0);
528 gv_init(gv, stash, name, len, TRUE);
529 }
7e68c38b 530 GvMULTI_on(gv);
0f8d4b5e
FC
531 if (ampable) {
532 ENTER;
533 oldcurcop = PL_curcop;
534 oldparser = PL_parser;
535 lex_start(NULL, NULL, 0);
536 oldcompcv = PL_compcv;
537 PL_compcv = NULL; /* Prevent start_subparse from setting
538 CvOUTSIDE. */
539 oldsavestack_ix = start_subparse(FALSE,0);
540 cv = PL_compcv;
541 }
542 else {
543 /* Avoid calling newXS, as it calls us, and things start to
544 get hairy. */
545 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
546 GvCV_set(gv,cv);
547 GvCVGEN(gv) = 0;
0f8d4b5e
FC
548 CvISXSUB_on(cv);
549 CvXSUB(cv) = core_xsub;
550 }
551 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
552 from PL_curcop. */
553 (void)gv_fetchfile(file);
554 CvFILE(cv) = (char *)file;
555 /* XXX This is inefficient, as doing things this order causes
556 a prototype check in newATTRSUB. But we have to do
557 it this order as we need an op number before calling
558 new ATTRSUB. */
559 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 560 if (stash)
73c02f15 561 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 562 if (ampable) {
4428fb0e
TC
563#ifdef DEBUGGING
564 CV *orig_cv = cv;
565#endif
0f8d4b5e 566 CvLVALUE_on(cv);
4428fb0e
TC
567 /* newATTRSUB will free the CV and return NULL if we're still
568 compiling after a syntax error */
e8f91c91 569 if ((cv = newATTRSUB_x(
7e68c38b 570 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC
571 NULL,NULL,
572 coresub_op(
573 opnum
574 ? newSVuv((UV)opnum)
575 : newSVpvn(name,len),
576 code, opnum
7e68c38b 577 ),
e8f91c91 578 TRUE
4428fb0e
TC
579 )) != NULL) {
580 assert(GvCV(gv) == orig_cv);
581 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
582 && opnum != OP_UNDEF)
583 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
584 }
0f8d4b5e
FC
585 LEAVE;
586 PL_parser = oldparser;
587 PL_curcop = oldcurcop;
588 PL_compcv = oldcompcv;
589 }
4428fb0e
TC
590 if (cv) {
591 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
592 cv_set_call_checker(
593 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
594 );
595 SvREFCNT_dec(opnumsv);
596 }
597
0f8d4b5e
FC
598 return gv;
599}
600
954c1994 601/*
6c53d59b
FC
602=for apidoc gv_fetchmeth
603
604Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
605
e6919483
BF
606=for apidoc gv_fetchmeth_sv
607
608Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
609of an SV instead of a string/length pair.
610
611=cut
612*/
613
614GV *
615Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
616{
617 char *namepv;
618 STRLEN namelen;
619 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
620 namepv = SvPV(namesv, namelen);
621 if (SvUTF8(namesv))
622 flags |= SVf_UTF8;
623 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
624}
625
626/*
627=for apidoc gv_fetchmeth_pv
628
629Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
630instead of a string/length pair.
631
632=cut
633*/
634
635GV *
636Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
637{
638 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
639 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
640}
641
642/*
643=for apidoc gv_fetchmeth_pvn
954c1994
GS
644
645Returns the glob with the given C<name> and a defined subroutine or
646C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 647accessible via @ISA and UNIVERSAL::.
954c1994
GS
648
649The argument C<level> should be either 0 or -1. If C<level==0>, as a
650side-effect creates a glob with the given C<name> in the given C<stash>
651which in the case of success contains an alias for the subroutine, and sets
e1a479c5 652up caching info for this glob.
954c1994 653
aae43805
FC
654The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
655
656GV_SUPER indicates that we want to look up the method in the superclasses
657of the C<stash>.
e6919483 658
aae43805 659The
954c1994 660GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 661visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 662the GV directly; instead, you should use the method's CV, which can be
b267980d 663obtained from the GV with the C<GvCV> macro.
954c1994
GS
664
665=cut
666*/
667
e1a479c5
BB
668/* NOTE: No support for tied ISA */
669
79072805 670GV *
e6919483 671Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 672{
463ee0b2 673 GV** gvp;
e1a479c5
BB
674 AV* linear_av;
675 SV** linear_svp;
676 SV* linear_sv;
aae43805 677 HV* cstash, *cachestash;
e1a479c5
BB
678 GV* candidate = NULL;
679 CV* cand_cv = NULL;
e1a479c5 680 GV* topgv = NULL;
bfcb3514 681 const char *hvname;
e1a479c5
BB
682 I32 create = (level >= 0) ? 1 : 0;
683 I32 items;
e1a479c5 684 U32 topgen_cmp;
04f3bf56 685 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 686
e6919483 687 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 688
af09ea45
IK
689 /* UNIVERSAL methods should be callable without a stash */
690 if (!stash) {
e1a479c5 691 create = 0; /* probably appropriate */
da51bb9b 692 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK
693 return 0;
694 }
695
e1a479c5
BB
696 assert(stash);
697
bfcb3514
NC
698 hvname = HvNAME_get(stash);
699 if (!hvname)
e1a479c5 700 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 701
e1a479c5
BB
702 assert(hvname);
703 assert(name);
463ee0b2 704
aae43805
FC
705 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
706 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
44a8e56a 707
dd69841b 708 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 709
aae43805 710 if (flags & GV_SUPER) {
1a33a059
FC
711 if (!HvAUX(stash)->xhv_mro_meta->super)
712 HvAUX(stash)->xhv_mro_meta->super = newHV();
713 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC
714 }
715 else cachestash = stash;
716
e1a479c5 717 /* check locally for a real method or a cache entry */
aae43805
FC
718 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
719 create);
e1a479c5
BB
720 if(gvp) {
721 topgv = *gvp;
0f8d4b5e 722 have_gv:
e1a479c5
BB
723 assert(topgv);
724 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 725 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
726 if ((cand_cv = GvCV(topgv))) {
727 /* If genuine method or valid cache entry, use it */
728 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
729 return topgv;
730 }
731 else {
732 /* stale cache entry, junk it and move on */
e7881358 733 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM
734 GvCV_set(topgv, NULL);
735 cand_cv = NULL;
e1a479c5
BB
736 GvCVGEN(topgv) = 0;
737 }
738 }
739 else if (GvCVGEN(topgv) == topgen_cmp) {
740 /* cache indicates no such method definitively */
741 return 0;
742 }
aae43805
FC
743 else if (stash == cachestash
744 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 745 && strnEQ(hvname, "CORE", 4)
87566176 746 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 747 goto have_gv;
463ee0b2 748 }
79072805 749
aae43805 750 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB
751 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
752 items = AvFILLp(linear_av); /* no +1, to skip over self */
753 while (items--) {
754 linear_sv = *linear_svp++;
755 assert(linear_sv);
756 cstash = gv_stashsv(linear_sv, 0);
757
dd69841b 758 if (!cstash) {
ecad31f0 759 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 760 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 761 SVfARG(linear_sv),
d0c0e7dd 762 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB
763 continue;
764 }
9607fc9c 765
e1a479c5
BB
766 assert(cstash);
767
c60dbbc3 768 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC
769 if (!gvp) {
770 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
771 const char *hvname = HvNAME(cstash); assert(hvname);
772 if (strnEQ(hvname, "CORE", 4)
773 && (candidate =
87566176 774 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC
775 ))
776 goto have_candidate;
777 }
778 continue;
779 }
780 else candidate = *gvp;
781 have_candidate:
e1a479c5 782 assert(candidate);
04f3bf56 783 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 784 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
785 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
786 /*
787 * Found real method, cache method in topgv if:
788 * 1. topgv has no synonyms (else inheritance crosses wires)
789 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
790 */
791 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
792 CV *old_cv = GvCV(topgv);
793 SvREFCNT_dec(old_cv);
e1a479c5 794 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 795 GvCV_set(topgv, cand_cv);
e1a479c5
BB
796 GvCVGEN(topgv) = topgen_cmp;
797 }
798 return candidate;
799 }
800 }
9607fc9c 801
e1a479c5
BB
802 /* Check UNIVERSAL without caching */
803 if(level == 0 || level == -1) {
aae43805 804 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
e1a479c5
BB
805 if(candidate) {
806 cand_cv = GvCV(candidate);
807 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
808 CV *old_cv = GvCV(topgv);
809 SvREFCNT_dec(old_cv);
e1a479c5 810 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 811 GvCV_set(topgv, cand_cv);
e1a479c5
BB
812 GvCVGEN(topgv) = topgen_cmp;
813 }
814 return candidate;
815 }
816 }
817
818 if (topgv && GvREFCNT(topgv) == 1) {
819 /* cache the fact that the method is not defined */
820 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW
821 }
822
79072805
LW
823 return 0;
824}
825
954c1994 826/*
460e5730
FC
827=for apidoc gv_fetchmeth_autoload
828
829This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
830parameter.
831
d21989ed 832=for apidoc gv_fetchmeth_sv_autoload
611c1e95 833
d21989ed
BF
834Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
835of an SV instead of a string/length pair.
836
837=cut
838*/
839
840GV *
841Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
842{
843 char *namepv;
844 STRLEN namelen;
845 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
846 namepv = SvPV(namesv, namelen);
847 if (SvUTF8(namesv))
848 flags |= SVf_UTF8;
849 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
850}
851
852/*
853=for apidoc gv_fetchmeth_pv_autoload
854
855Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
856instead of a string/length pair.
857
858=cut
859*/
860
861GV *
862Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
863{
864 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
865 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
866}
867
868/*
869=for apidoc gv_fetchmeth_pvn_autoload
870
871Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ
872Returns a glob for the subroutine.
873
874For an autoloaded subroutine without a GV, will create a GV even
875if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
876of the result may be zero.
877
d21989ed
BF
878Currently, the only significant value for C<flags> is SVf_UTF8.
879
611c1e95
IZ
880=cut
881*/
882
883GV *
d21989ed 884Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 885{
499321d3 886 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 887
d21989ed 888 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 889
611c1e95 890 if (!gv) {
611c1e95
IZ
891 CV *cv;
892 GV **gvp;
893
894 if (!stash)
6136c704 895 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 896 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 897 return NULL;
d21989ed 898 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 899 return NULL;
611c1e95
IZ
900 cv = GvCV(gv);
901 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 902 return NULL;
611c1e95
IZ
903 /* Have an autoload */
904 if (level < 0) /* Cannot do without a stub */
d21989ed 905 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF
906 gvp = (GV**)hv_fetch(stash, name,
907 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 908 if (!gvp)
6136c704 909 return NULL;
611c1e95
IZ
910 return *gvp;
911 }
912 return gv;
913}
914
915/*
954c1994
GS
916=for apidoc gv_fetchmethod_autoload
917
918Returns the glob which contains the subroutine to call to invoke the method
919on the C<stash>. In fact in the presence of autoloading this may be the
920glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 921already setup.
954c1994
GS
922
923The third parameter of C<gv_fetchmethod_autoload> determines whether
924AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 925means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 926Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 927with a non-zero C<autoload> parameter.
954c1994 928
cec2d7b1
FC
929These functions grant C<"SUPER"> token
930as a prefix of the method name. Note
954c1994
GS
931that if you want to keep the returned glob for a long time, you need to
932check for it being "AUTOLOAD", since at the later time the call may load a
cec2d7b1
FC
933different subroutine due to $AUTOLOAD changing its value. Use the glob
934created as a side effect to do this.
954c1994 935
cec2d7b1
FC
936These functions have the same side-effects as C<gv_fetchmeth> with
937C<level==0>. The warning against passing the GV returned by
938C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS
939
940=cut
941*/
942
dc848c6f 943GV *
864dbfa3 944Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 945{
547bb267
NC
946 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
947
256d1bb2
NC
948 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
949}
950
44130a26
BF
951GV *
952Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
953{
954 char *namepv;
955 STRLEN namelen;
956 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
957 namepv = SvPV(namesv, namelen);
958 if (SvUTF8(namesv))
959 flags |= SVf_UTF8;
960 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
961}
962
963GV *
964Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
965{
966 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
967 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
968}
969
256d1bb2
NC
970/* Don't merge this yet, as it's likely to get a len parameter, and possibly
971 even a U32 hash */
972GV *
44130a26 973Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 974{
eb578fdb 975 const char *nend;
c445ea15 976 const char *nsplit = NULL;
a0d0e21e 977 GV* gv;
0dae17bd 978 HV* ostash = stash;
c94593d0 979 const char * const origname = name;
ad64d0ec 980 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
981 const U32 autoload = flags & GV_AUTOLOAD;
982 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 983 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 984
44130a26 985 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 986
eff494dd 987 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 988 stash = NULL;
c9bf4021
NC
989 else {
990 /* The only way stash can become NULL later on is if nsplit is set,
991 which in turn means that there is no need for a SVt_PVHV case
992 the error reporting code. */
993 }
b267980d 994
44130a26 995 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 996 if (*nend == '\'') {
a0d0e21e 997 nsplit = nend;
c94593d0
NC
998 name = nend + 1;
999 }
1000 else if (*nend == ':' && *(nend + 1) == ':') {
1001 nsplit = nend++;
1002 name = nend + 1;
1003 }
a0d0e21e
LW
1004 }
1005 if (nsplit) {
7edbdc6b 1006 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 1007 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC
1008 stash = CopSTASH(PL_curcop);
1009 flags |= GV_SUPER;
cea2e8a9 1010 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1011 origname, HvENAME_get(stash), name) );
4633a7c4 1012 }
aae43805
FC
1013 else if ((nsplit - origname) >= 7 &&
1014 strnEQ(nsplit - 7, "::SUPER", 7)) {
1015 /* don't autovifify if ->NoSuchStash::SUPER::method */
1016 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
1017 if (stash) flags |= GV_SUPER;
1018 }
e189a56d 1019 else {
af09ea45 1020 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1021 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 1022 }
0dae17bd 1023 ostash = stash;
4633a7c4
LW
1024 }
1025
14d1dfbd 1026 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1027 if (!gv) {
2f6e0fe7 1028 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1029 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1030 else if (autoload)
c8416c26
BF
1031 gv = gv_autoload_pvn(
1032 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1033 );
256d1bb2
NC
1034 if (!gv && do_croak) {
1035 /* Right now this is exclusively for the benefit of S_method_common
1036 in pp_hot.c */
1037 if (stash) {
15e6cdd9
DG
1038 /* If we can't find an IO::File method, it might be a call on
1039 * a filehandle. If IO:File has not been loaded, try to
1040 * require it first instead of croaking */
1041 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1042 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1043 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1044 STR_WITH_LEN("IO/File.pm"), 0,
1045 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1046 ) {
31b05a0f 1047 require_pv("IO/File.pm");
14d1dfbd 1048 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG
1049 if (gv)
1050 return gv;
1051 }
256d1bb2 1052 Perl_croak(aTHX_
b17a0679 1053 "Can't locate object method \"%"UTF8f
d0c0e7dd 1054 "\" via package \"%"HEKf"\"",
b17a0679 1055 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1056 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC
1057 }
1058 else {
ecad31f0 1059 SV* packnamesv;
256d1bb2 1060
256d1bb2 1061 if (nsplit) {
ecad31f0
BF
1062 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1063 SVs_TEMP | is_utf8);
256d1bb2 1064 } else {
017c5e4e 1065 packnamesv = error_report;
256d1bb2
NC
1066 }
1067
1068 Perl_croak(aTHX_
b17a0679
FC
1069 "Can't locate object method \"%"UTF8f
1070 "\" via package \"%"SVf"\""
ecad31f0 1071 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1072 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1073 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1074 }
1075 }
463ee0b2 1076 }
dc848c6f 1077 else if (autoload) {
9d4ba2ae 1078 CV* const cv = GvCV(gv);
09280a33
CS
1079 if (!CvROOT(cv) && !CvXSUB(cv)) {
1080 GV* stubgv;
1081 GV* autogv;
1082
8bfda0d7 1083 if (CvANON(cv) || !CvGV(cv))
09280a33
CS
1084 stubgv = gv;
1085 else {
1086 stubgv = CvGV(cv);
1087 if (GvCV(stubgv) != cv) /* orphaned import */
1088 stubgv = gv;
1089 }
c8416c26
BF
1090 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1091 GvNAME(stubgv), GvNAMELEN(stubgv),
1092 GV_AUTOLOAD_ISMETHOD
1093 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1094 if (autogv)
1095 gv = autogv;
1096 }
1097 }
44a8e56a
PP
1098
1099 return gv;
1100}
1101
1102GV*
0eeb01b9 1103Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1104{
1105 char *namepv;
1106 STRLEN namelen;
0fe84f7c 1107 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1108 namepv = SvPV(namesv, namelen);
1109 if (SvUTF8(namesv))
1110 flags |= SVf_UTF8;
0eeb01b9 1111 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1112}
1113
1114GV*
0eeb01b9 1115Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1116{
0fe84f7c 1117 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1118 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1119}
1120
1121GV*
0eeb01b9 1122Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1123{
44a8e56a
PP
1124 GV* gv;
1125 CV* cv;
1126 HV* varstash;
1127 GV* vargv;
1128 SV* varsv;
c8416c26
BF
1129 SV *packname = NULL;
1130 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1131
0fe84f7c 1132 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1133
7edbdc6b 1134 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1135 return NULL;
0dae17bd
GS
1136 if (stash) {
1137 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1138 STRLEN packname_len = 0;
1139 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1140 packname = newSVpvn_flags(packname_ptr, packname_len,
1141 SVs_TEMP | SvUTF8(stash));
5c284bb0 1142 stash = NULL;
0dae17bd 1143 }
c8416c26
BF
1144 else
1145 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1146 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1147 }
257dc59d
FC
1148 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1149 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1150 return NULL;
dc848c6f
PP
1151 cv = GvCV(gv);
1152
adb5a9ae 1153 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1154 return NULL;
ed850460 1155
dc848c6f
PP
1156 /*
1157 * Inheriting AUTOLOAD for non-methods works ... for now.
1158 */
0eeb01b9
FC
1159 if (
1160 !(flags & GV_AUTOLOAD_ISMETHOD)
1161 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1162 )
d1d15184 1163 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC
1164 "Use of inherited AUTOLOAD for non-method %"SVf
1165 "::%"UTF8f"() is deprecated",
ecad31f0 1166 SVfARG(packname),
b17a0679 1167 UTF8fARG(is_utf8, len, name));
44a8e56a 1168
aed2304a 1169 if (CvISXSUB(cv)) {
bb619f37
FC
1170 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1171 * and split that value on the last '::', pass along the same data
1172 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC
1173 *
1174 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1175 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC
1176 * type. Since SvPVX has been documented as returning the sub name
1177 * for a long time, but not as returning the prototype, we have
1178 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1179 * elsewhere.
1180 *
1181 * We put the prototype in the same allocated buffer, but after
1182 * the sub name. The SvPOK flag indicates the presence of a proto-
1183 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1184 * If both flags are on, then SvLEN is used to indicate the end of
1185 * the prototype (artificially lower than what is actually allo-
1186 * cated), at the risk of having to reallocate a few bytes unneces-
1187 * sarily--but that should happen very rarely, if ever.
1188 *
1189 * We use SvUTF8 for both prototypes and sub names, so if one is
1190 * UTF8, the other must be upgraded.
adb5a9ae 1191 */
c68d9564 1192 CvSTASH_set(cv, stash);
8fa6a409 1193 if (SvPOK(cv)) { /* Ouch! */
e7881358 1194 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC
1195 STRLEN ulen;
1196 const char *proto = CvPROTO(cv);
1197 assert(proto);
1198 if (SvUTF8(cv))
1199 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1200 ulen = SvCUR(tmpsv);
1201 SvCUR(tmpsv)++; /* include null in string */
1202 sv_catpvn_flags(
1203 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1204 );
1205 SvTEMP_on(tmpsv); /* Allow theft */
1206 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1207 SvTEMP_off(tmpsv);
e7881358 1208 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC
1209 SvLEN(cv) = SvCUR(cv) + 1;
1210 SvCUR(cv) = ulen;
1211 }
1212 else {
1213 sv_setpvn((SV *)cv, name, len);
1214 SvPOK_off(cv);
1215 if (is_utf8)
c8416c26 1216 SvUTF8_on(cv);
8fa6a409
FC
1217 else SvUTF8_off(cv);
1218 }
1219 CvAUTOLOAD_on(cv);
adb5a9ae 1220 }
adb5a9ae 1221
44a8e56a
PP
1222 /*
1223 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1224 * The subroutine's original name may not be "AUTOLOAD", so we don't
1225 * use that, but for lack of anything better we will use the sub's
1226 * original package to look up $AUTOLOAD.
1227 */
18691622 1228 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1229 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1230 ENTER;
1231
c69033f2 1232 if (!isGV(vargv)) {
04ec7e59 1233 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1234#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1235 GvSV(vargv) = newSV(0);
c69033f2
NC
1236#endif
1237 }
3d35f11b 1238 LEAVE;
e203899d 1239 varsv = GvSVn(vargv);
4bac9ae4
CS
1240 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1241 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1242 sv_setsv(varsv, packname);
396482e1 1243 sv_catpvs(varsv, "::");
d40bf27b
NC
1244 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1245 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC
1246 sv_catpvn_flags(
1247 varsv, name, len,
5bcd1ef4 1248 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1249 );
c8416c26
BF
1250 if (is_utf8)
1251 SvUTF8_on(varsv);
a0d0e21e
LW
1252 return gv;
1253}
1254
44a2ac75
YO
1255
1256/* require_tie_mod() internal routine for requiring a module
486ec47a 1257 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO
1258 *
1259 * The "gv" parameter should be the glob.
45cbc99a
RGS
1260 * "varpv" holds the name of the var, used for error messages.
1261 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1262 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS
1263 * are working reasonably close to as expected.
1264 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1265 * For the protection of $! to work (it is set by this routine)
1266 * the sv slot must already be magicalized.
d2c93421 1267 */
44a2ac75
YO
1268STATIC HV*
1269S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1270{
da51bb9b 1271 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1272
7918f24d
NC
1273 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1274
0ea03996 1275 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS
1276 SV *module = newSVsv(namesv);
1277 char varname = *varpv; /* varpv might be clobbered by load_module,
1278 so save it. For the moment it's always
1279 a single char. */
b82b06b8 1280 const char type = varname == '[' ? '$' : '%';
61bac25c 1281#ifdef DEBUGGING
d2c93421 1282 dSP;
61bac25c 1283#endif
d2c93421 1284 ENTER;
600beb2e 1285 SAVEFREESV(namesv);
44a2ac75 1286 if ( flags & 1 )
45cbc99a
RGS
1287 save_scalar(gv);
1288 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1289 assert(sp == PL_stack_sp);
da51bb9b 1290 stash = gv_stashsv(namesv, 0);
44a2ac75 1291 if (!stash)
b82b06b8
FC
1292 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1293 type, varname, SVfARG(namesv));
45cbc99a 1294 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC
1295 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1296 type, varname, SVfARG(namesv), methpv);
600beb2e 1297 LEAVE;
d2c93421 1298 }
e7881358 1299 else SvREFCNT_dec_NN(namesv);
44a2ac75 1300 return stash;
d2c93421
RH
1301}
1302
954c1994
GS
1303/*
1304=for apidoc gv_stashpv
1305
da51bb9b 1306Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1307determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1308
1309=cut
1310*/
1311
a0d0e21e 1312HV*
864dbfa3 1313Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1314{
7918f24d 1315 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1316 return gv_stashpvn(name, strlen(name), create);
1317}
1318
bc96cb06
SH
1319/*
1320=for apidoc gv_stashpvn
1321
da51bb9b
NC
1322Returns a pointer to the stash for a specified package. The C<namelen>
1323parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1324to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1325created if it does not already exist. If the package does not exist and
1326C<flags> is 0 (or any other setting that does not create packages) then NULL
1327is returned.
1328
566a4718
YO
1329Flags may be one of:
1330
1331 GV_ADD
1332 SVf_UTF8
1333 GV_NOADD_NOINIT
1334 GV_NOINIT
1335 GV_NOEXPAND
1336 GV_ADDMG
1337
1338The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06 1339
808724c8 1340Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1341recommended for performance reasons.
1342
bc96cb06
SH
1343=cut
1344*/
1345
0eadbdad
YO
1346/*
1347gv_stashpvn_internal
1348
1349Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1350as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1351
1352*/
1353
4e7ebec5 1354PERL_STATIC_INLINE HV*
0eadbdad 1355S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1356{
0cea0058 1357 char smallbuf[128];
46fc3d4c 1358 char *tmpbuf;
a0d0e21e
LW
1359 HV *stash;
1360 GV *tmpgv;
add0ecde 1361 U32 tmplen = namelen + 2;
dc437b57 1362
0eadbdad 1363 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1364
add0ecde 1365 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1366 tmpbuf = smallbuf;
1367 else
add0ecde
VP
1368 Newx(tmpbuf, tmplen, char);
1369 Copy(name, tmpbuf, namelen, char);
1370 tmpbuf[namelen] = ':';
1371 tmpbuf[namelen+1] = ':';
1372 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1373 if (tmpbuf != smallbuf)
1374 Safefree(tmpbuf);
a0d0e21e 1375 if (!tmpgv)
da51bb9b 1376 return NULL;
a0d0e21e 1377 stash = GvHV(tmpgv);
1f656fcf 1378 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1379 assert(stash);
1f656fcf 1380 if (!HvNAME_get(stash)) {
0be4d16f 1381 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1382
1383 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1384 /* If the containing stash has multiple effective
1385 names, see that this one gets them, too. */
1386 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1387 mro_package_moved(stash, NULL, tmpgv, 1);
1388 }
a0d0e21e 1389 return stash;
463ee0b2
LW
1390}
1391
808724c8 1392/*
1393gv_stashsvpvn_cached
1394
1395Returns a pointer to the stash for a specified package, possibly
1396cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1397
1398Requires one of either namesv or namepv to be non-null.
1399
1400See C<gv_stashpvn> for details on "flags".
1401
1402Note the sv interface is strongly preferred for performance reasons.
1403
1404*/
1405
1406#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1407 assert(namesv || name)
1408
1409PERL_STATIC_INLINE HV*
1410S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1411{
1412 HV* stash;
808724c8 1413 HE* he;
1414
1415 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1416
1417 he = (HE *)hv_common(
1418 PL_stashcache, namesv, name, namelen,
4e7ebec5 1419 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1420 );
808724c8 1421
4e7ebec5 1422 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1423 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1424
808724c8 1425 if (namesv) {
1426 if (SvOK(namesv)) { /* prevent double uninit warning */
1427 STRLEN len;
1428 name = SvPV_const(namesv, len);
1429 namelen = len;
1430 flags |= SvUTF8(namesv);
1431 } else {
1432 name = ""; namelen = 0;
1433 }
1434 }
0eadbdad
YO
1435 stash = gv_stashpvn_internal(name, namelen, flags);
1436
4e7ebec5 1437 if (stash && namelen) {
1438 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1439 (void)hv_store(PL_stashcache, name,
4e7ebec5 1440 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1441 }
808724c8 1442
4e7ebec5 1443 return stash;
1444}
1445
808724c8 1446HV*
1447Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1448{
1449 PERL_ARGS_ASSERT_GV_STASHPVN;
1450 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1451}
1452
954c1994
GS
1453/*
1454=for apidoc gv_stashsv
1455
da51bb9b 1456Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994 1457
808724c8 1458Note this interface is strongly preferred over C<gv_stashpvn> for performance reasons.
1459
954c1994
GS
1460=cut
1461*/
1462
a0d0e21e 1463HV*
da51bb9b 1464Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1465{
7918f24d 1466 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1467 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW
1468}
1469
1470
463ee0b2 1471GV *
fe9845cc 1472Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1473 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1474 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1475}
1476
1477GV *
fe9845cc 1478Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1479 STRLEN len;
77cb3b01
FC
1480 const char * const nambeg =
1481 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1482 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1483 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1484}
1485
90aeefb4 1486PERL_STATIC_INLINE void
290a1700 1487S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1488{
1489 AV* av;
1490
1491 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1492
1493 av = GvAVn(gv);
1494 GvMULTI_on(gv);
1495 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1496 NULL, 0);
ad7cce9f
FR
1497}
1498
90aeefb4
BF
1499/* This function grabs name and tries to split a stash and glob
1500 * from its contents. TODO better description, comments
1501 *
1502 * If the function returns TRUE and 'name == name_end', then
1503 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1504 */
1505PERL_STATIC_INLINE bool
1506S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1507 STRLEN *len, const char *nambeg, STRLEN full_len,
1508 const U32 is_utf8, const I32 add)
1509{
1510 const char *name_cursor;
1511 const char *const name_end = nambeg + full_len;
1512 const char *const name_em1 = name_end - 1;
1513
1514 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1515
1516 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1517 /* accidental stringify on a GV? */
1518 (*name)++;
1519 }
1520
1521 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1522 if (name_cursor < name_em1 &&
1523 ((*name_cursor == ':' && name_cursor[1] == ':')
1524 || *name_cursor == '\''))
1525 {
1526 if (!*stash)
1527 *stash = PL_defstash;
1528 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1529 return FALSE;
1530
1531 *len = name_cursor - *name;
1532 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1533 const char *key;
1534 GV**gvp;
1535 if (*name_cursor == ':') {
1536 key = *name;
1537 *len += 2;
1538 }
1539 else {
1540 char *tmpbuf;
1541 Newx(tmpbuf, *len+2, char);
1542 Copy(*name, tmpbuf, *len, char);
1543 tmpbuf[(*len)++] = ':';
1544 tmpbuf[(*len)++] = ':';
1545 key = tmpbuf;
1546 }
c161da64 1547 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF
1548 *gv = gvp ? *gvp : NULL;
1549 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1550 if (SvTYPE(*gv) != SVt_PVGV)
1551 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1552 else
1553 GvMULTI_on(*gv);
1554 }
1555 if (key != *name)
1556 Safefree(key);
1557 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1558 return FALSE;
1559
1560 if (!(*stash = GvHV(*gv))) {
1561 *stash = GvHV(*gv) = newHV();
1562 if (!HvNAME_get(*stash)) {
1563 if (GvSTASH(*gv) == PL_defstash && *len == 6
1564 && strnEQ(*name, "CORE", 4))
1565 hv_name_set(*stash, "CORE", 4, 0);
1566 else
1567 hv_name_set(
1568 *stash, nambeg, name_cursor-nambeg, is_utf8
1569 );
1570 /* If the containing stash has multiple effective
1571 names, see that this one gets them, too. */
1572 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1573 mro_package_moved(*stash, NULL, *gv, 1);
1574 }
1575 }
1576 else if (!HvNAME_get(*stash))
1577 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1578 }
1579
1580 if (*name_cursor == ':')
1581 name_cursor++;
1582 *name = name_cursor+1;
1583 if (*name == name_end) {
1584 if (!*gv)
1585 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1586 return TRUE;
1587 }
1588 }
1589 }
1590 *len = name_cursor - *name;
1591 return TRUE;
1592}
1593
536d1a88 1594/* Checks if an unqualified name is in the main stash */
90aeefb4 1595PERL_STATIC_INLINE bool
536d1a88 1596S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1597{
536d1a88 1598 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1599
90aeefb4 1600 /* If it's an alphanumeric variable */
536d1a88 1601 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF
1602 /* Some "normal" variables are always in main::,
1603 * like INC or STDOUT.
1604 */
1605 switch (len) {
1606 case 1:
1607 if (*name == '_')
536d1a88 1608 return TRUE;
90aeefb4
BF
1609 break;
1610 case 3:
1611 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1612 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1613 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1614 return TRUE;
90aeefb4
BF
1615 break;
1616 case 4:
1617 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1618 && name[3] == 'V')
536d1a88 1619 return TRUE;
90aeefb4
BF
1620 break;
1621 case 5:
1622 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1623 && name[3] == 'I' && name[4] == 'N')
536d1a88 1624 return TRUE;
90aeefb4
BF
1625 break;
1626 case 6:
1627 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1628 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1629 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1630 return TRUE;
90aeefb4
BF
1631 break;
1632 case 7:
1633 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1634 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1635 && name[6] == 'T')
536d1a88 1636 return TRUE;
90aeefb4
BF
1637 break;
1638 }
536d1a88
BF
1639 }
1640 /* *{""}, or a special variable like $@ */
1641 else
1642 return TRUE;
1643
1644 return FALSE;
1645}
1646
1647
1648/* This function is called if parse_gv_stash_name() failed to
1649 * find a stash, or if GV_NOTQUAL or an empty name was passed
1650 * to gv_fetchpvn_flags.
1651 *
1652 * It returns FALSE if the default stash can't be found nor created,
1653 * which might happen during global destruction.
1654 */
1655PERL_STATIC_INLINE bool
1656S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1657 const U32 is_utf8, const I32 add,
1658 const svtype sv_type)
1659{
1660 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1661
1662 /* No stash in name, so see how we can default */
90aeefb4 1663
536d1a88
BF
1664 if ( gv_is_in_main(name, len, is_utf8) ) {
1665 *stash = PL_defstash;
1666 }
1667 else {
1668 if (IN_PERL_COMPILETIME) {
90aeefb4
BF
1669 *stash = PL_curstash;
1670 if (add && (PL_hints & HINT_STRICT_VARS) &&
1671 sv_type != SVt_PVCV &&
1672 sv_type != SVt_PVGV &&
1673 sv_type != SVt_PVFM &&
1674 sv_type != SVt_PVIO &&
1675 !(len == 1 && sv_type == SVt_PV &&
1676 (*name == 'a' || *name == 'b')) )
1677 {
c161da64 1678 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF
1679 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1680 SvTYPE(*gvp) != SVt_PVGV)
1681 {
1682 *stash = NULL;
1683 }
1684 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1685 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1686 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1687 {
1688 /* diag_listed_as: Variable "%s" is not imported%s */
1689 Perl_ck_warner_d(
1690 aTHX_ packWARN(WARN_MISC),
1691 "Variable \"%c%"UTF8f"\" is not imported",
1692 sv_type == SVt_PVAV ? '@' :
1693 sv_type == SVt_PVHV ? '%' : '$',
1694 UTF8fARG(is_utf8, len, name));
1695 if (GvCVu(*gvp))
1696 Perl_ck_warner_d(
1697 aTHX_ packWARN(WARN_MISC),
1698 "\t(Did you mean &%"UTF8f" instead?)\n",
1699 UTF8fARG(is_utf8, len, name)
1700 );
1701 *stash = NULL;
1702 }
1703 }
1704 }
1705 else {
1706 /* Use the current op's stash */
1707 *stash = CopSTASH(PL_curcop);
1708 }
1709 }
90aeefb4
BF
1710
1711 if (!*stash) {
1712 if (add && !PL_in_clean_all) {
1713 SV * const err = Perl_mess(aTHX_
1714 "Global symbol \"%s%"UTF8f
1715 "\" requires explicit package name",
1716 (sv_type == SVt_PV ? "$"
1717 : sv_type == SVt_PVAV ? "@"
1718 : sv_type == SVt_PVHV ? "%"
1719 : ""), UTF8fARG(is_utf8, len, name));
1720 GV *gv;
1721 if (is_utf8)
1722 SvUTF8_on(err);
1723 qerror(err);
cd164bf8
BF
1724 /* To maintain the output of errors after the strict exception
1725 * above, and to keep compat with older releases, rather than
1726 * placing the variables in the pad, we place
1727 * them in the <none>:: stash.
1728 */
90aeefb4
BF
1729 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1730 if (!gv) {
1731 /* symbol table under destruction */
1732 return FALSE;
1733 }
1734 *stash = GvHV(gv);
1735 }
1736 else
1737 return FALSE;
1738 }
1739
1740 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1741 return FALSE;
1742
1743 return TRUE;
1744}
1745
930867a8
BF
1746/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1747 * a new GV.
1748 * Note that it does not insert the GV into the stash prior to
1749 * magicalization, which some variables require need in order
1750 * to work (like $[, %+, %-, %!), so callers must take care of
1751 * that beforehand.
1752 *
1753 * The return value has a specific meaning for gv_fetchpvn_flags:
1754 * If it returns true, and the gv is empty, it indicates that its
1755 * refcount should be decreased.
1756 */
1757PERL_STATIC_INLINE bool
1758S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1759 bool addmg, const svtype sv_type)
79072805 1760{
960b831f 1761 SSize_t paren;
79072805 1762
930867a8 1763 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1764
44428a46 1765 if (stash != PL_defstash) { /* not the main stash */
ea238638 1766 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC
1767 and VERSION. All the others apply only to the main stash or to
1768 CORE (which is checked right after this). */
ea238638 1769 if (len) {
b464bac0 1770 const char * const name2 = name + 1;
cc4c2da6 1771 switch (*name) {
cc4c2da6
NC
1772 case 'E':
1773 if (strnEQ(name2, "XPORT", 5))
1774 GvMULTI_on(gv);
1775 break;
1776 case 'I':
44428a46 1777 if (strEQ(name2, "SA"))
290a1700 1778 gv_magicalize_isa(gv);
cc4c2da6 1779 break;
44428a46
FC
1780 case 'V':
1781 if (strEQ(name2, "ERSION"))
1782 GvMULTI_on(gv);
1783 break;
ea238638
FC
1784 case 'a':
1785 case 'b':
1786 if (len == 1 && sv_type == SVt_PV)
1787 GvMULTI_on(gv);
924ba076 1788 /* FALLTHROUGH */
4aaa4757
FC
1789 default:
1790 goto try_core;
1791 }
930867a8 1792 return addmg;
4aaa4757
FC
1793 }
1794 try_core:
1795 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1796 /* Avoid null warning: */
1797 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC
1798 if (strnEQ(stashname, "CORE", 4))
1799 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC
1800 }
1801 }
1802 else if (len > 1) {
1803#ifndef EBCDIC
1804 if (*name > 'V' ) {
1805 NOOP;
1806 /* Nothing else to do.
1807 The compiler will probably turn the switch statement into a
1808 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW
1809 the common case of lower case variable names. (On EBCDIC
1810 platforms, we can't just do:
1811 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1812 because cases like '\027' in the switch statement below are
1813 C1 (non-ASCII) controls on those platforms, so the remapping
1814 would make them larger than 'V')
1815 */
44428a46
FC
1816 } else
1817#endif
1818 {
1819 const char * const name2 = name + 1;
1820 switch (*name) {
1821 case 'A':
1822 if (strEQ(name2, "RGV")) {
1823 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1824 }
1825 else if (strEQ(name2, "RGVOUT")) {
1826 GvMULTI_on(gv);
1827 }
1828 break;
1829 case 'E':
1830 if (strnEQ(name2, "XPORT", 5))
1831 GvMULTI_on(gv);
1832 break;
1833 case 'I':
1834 if (strEQ(name2, "SA")) {
290a1700 1835 gv_magicalize_isa(gv);
44428a46
FC
1836 }
1837 break;
cc4c2da6
NC
1838 case 'S':
1839 if (strEQ(name2, "IG")) {
1840 HV *hv;
1841 I32 i;
d525a7b2
NC
1842 if (!PL_psig_name) {
1843 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1844 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1845 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1846 } else {
1847 /* I think that the only way to get here is to re-use an
1848 embedded perl interpreter, where the previous
1849 use didn't clean up fully because
1850 PL_perl_destruct_level was 0. I'm not sure that we
1851 "support" that, in that I suspect in that scenario
1852 there are sufficient other garbage values left in the
1853 interpreter structure that something else will crash
1854 before we get here. I suspect that this is one of
1855 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1856 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1857 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
1858 }
1859 GvMULTI_on(gv);
1860 hv = GvHVn(gv);
a0714e2c 1861 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1862 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1863 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
1864 if (init)
1865 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
1866 }
1867 }
1868 break;
1869 case 'V':
1870 if (strEQ(name2, "ERSION"))
1871 GvMULTI_on(gv);
1872 break;
e5218da5
GA
1873 case '\003': /* $^CHILD_ERROR_NATIVE */
1874 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1875 goto magicalize;
1876 break;
cc4c2da6
NC
1877 case '\005': /* $^ENCODING */
1878 if (strEQ(name2, "NCODING"))
1879 goto magicalize;
1880 break;
9ebf26ad
FR
1881 case '\007': /* $^GLOBAL_PHASE */
1882 if (strEQ(name2, "LOBAL_PHASE"))
1883 goto ro_magicalize;
1884 break;
8561ea1d
FC
1885 case '\014': /* $^LAST_FH */
1886 if (strEQ(name2, "AST_FH"))
1887 goto ro_magicalize;
1888 break;
cde0cee5 1889 case '\015': /* $^MATCH */
960b831f
NC
1890 if (strEQ(name2, "ATCH")) {
1891 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1892 goto storeparen;
1893 }
66230c86 1894 break;
cc4c2da6
NC
1895 case '\017': /* $^OPEN */
1896 if (strEQ(name2, "PEN"))
1897 goto magicalize;
1898 break;
cde0cee5 1899 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC
1900 if (strEQ(name2, "REMATCH")) {
1901 paren = RX_BUFF_IDX_CARET_PREMATCH;
1902 goto storeparen;
1903 }
1904 if (strEQ(name2, "OSTMATCH")) {
1905 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1906 goto storeparen;
1907 }
9ebf26ad 1908 break;
cc4c2da6
NC
1909 case '\024': /* ${^TAINT} */
1910 if (strEQ(name2, "AINT"))
1911 goto ro_magicalize;
1912 break;
7cebcbc0 1913 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1914 if (strEQ(name2, "NICODE"))
cc4c2da6 1915 goto ro_magicalize;
a0288114 1916 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1917 goto ro_magicalize;
e07ea26a
NC
1918 if (strEQ(name2, "TF8CACHE"))
1919 goto magicalize;
cc4c2da6
NC
1920 break;
1921 case '\027': /* $^WARNING_BITS */
1922 if (strEQ(name2, "ARNING_BITS"))
1923 goto magicalize;
1924 break;
1925 case '1':
1926 case '2':
1927 case '3':
1928 case '4':
1929 case '5':
1930 case '6':
1931 case '7':
1932 case '8':
1933 case '9':
85e6fe83 1934 {
2fdbfb4d
AB
1935 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1936 this test */
1937 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC
1938 const char *end = name + len;
1939 while (--end > name) {
930867a8
BF
1940 if (!isDIGIT(*end))
1941 return addmg;
cc4c2da6 1942 }
99944878 1943 paren = grok_atou(name, NULL);
960b831f 1944 goto storeparen;
1d7c1841 1945 }
dc437b57 1946 }
93a17b20 1947 }
392db708
NC
1948 } else {
1949 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1950 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1951 switch (*name) {
6361f656 1952 case '&': /* $& */
960b831f
NC
1953 paren = RX_BUFF_IDX_FULLMATCH;
1954 goto sawampersand;
6361f656 1955 case '`': /* $` */
960b831f
NC
1956 paren = RX_BUFF_IDX_PREMATCH;
1957 goto sawampersand;
6361f656 1958 case '\'': /* $' */
960b831f
NC
1959 paren = RX_BUFF_IDX_POSTMATCH;
1960 sawampersand:
1a904fc8 1961#ifdef PERL_SAWAMPERSAND
a289ef89 1962 if (!(
cc4c2da6
NC
1963 sv_type == SVt_PVAV ||
1964 sv_type == SVt_PVHV ||
1965 sv_type == SVt_PVCV ||
1966 sv_type == SVt_PVFM ||
1967 sv_type == SVt_PVIO
d3b97530
DM
1968 )) { PL_sawampersand |=
1969 (*name == '`')
1970 ? SAWAMPERSAND_LEFT
1971 : (*name == '&')
1972 ? SAWAMPERSAND_MIDDLE
1973 : SAWAMPERSAND_RIGHT;
1974 }
1a904fc8 1975#endif
960b831f 1976 goto storeparen;
e91d8259
NC
1977 case '1': /* $1 */
1978 case '2': /* $2 */
1979 case '3': /* $3 */
1980 case '4': /* $4 */
1981 case '5': /* $5 */
1982 case '6': /* $6 */
1983 case '7': /* $7 */
1984 case '8': /* $8 */
1985 case '9': /* $9 */
960b831f
NC
1986 paren = *name - '0';
1987
1988 storeparen:
e91d8259
NC
1989 /* Flag the capture variables with a NULL mg_ptr
1990 Use mg_len for the array index to lookup. */
960b831f 1991 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 1992 break;
cc4c2da6 1993
6361f656 1994 case ':': /* $: */
c69033f2 1995 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
1996 goto magicalize;
1997
6361f656 1998 case '?': /* $? */
ff0cee69 1999#ifdef COMPLEX_STATUS
c69033f2 2000 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2001#endif
cc4c2da6 2002 goto magicalize;
ff0cee69 2003
6361f656 2004 case '!': /* $! */
67261566 2005 GvMULTI_on(gv);
44a2ac75 2006 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2007
ad64d0ec 2008 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2009
44a2ac75 2010 /* magicalization must be done before require_tie_mod is called */
67261566 2011 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 2012 {
44a2ac75 2013 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 2014 addmg = FALSE;
ffdb8bcd 2015 }
d2c93421 2016
6cef1e77 2017 break;
6361f656
AB
2018 case '-': /* $- */
2019 case '+': /* $+ */
44a2ac75
YO
2020 GvMULTI_on(gv); /* no used once warnings here */
2021 {
44a2ac75 2022 AV* const av = GvAVn(gv);
ad64d0ec 2023 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2024
ad64d0ec
NC
2025 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2026 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2027 if (avc)
44a2ac75 2028 SvREADONLY_on(GvSVn(gv));
44a2ac75 2029 SvREADONLY_on(av);
67261566
YO
2030
2031 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 2032 {
192b9cd1 2033 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 2034 addmg = FALSE;
213084e4 2035 }
67261566 2036
80305961 2037 break;
cc4c2da6 2038 }
6361f656
AB
2039 case '*': /* $* */
2040 case '#': /* $# */
9b387841 2041 if (sv_type == SVt_PV)
4f650b80 2042 /* diag_listed_as: $* is no longer supported */
9b387841 2043 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2044 "$%c is no longer supported", *name);
8ae1fe26 2045 break;
b3ca2e83
NC
2046 case '\010': /* $^H */
2047 {
2048 HV *const hv = GvHVn(gv);
2049 hv_magic(hv, NULL, PERL_MAGIC_hints);
2050 }
2051 goto magicalize;
b82b06b8 2052 case '[': /* $[ */
7d69d4a6 2053 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2054 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 2055 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 2056 addmg = FALSE;
b82b06b8 2057 }
7d69d4a6 2058 else goto magicalize;
b82b06b8 2059 break;
cc4c2da6 2060 case '\023': /* $^S */
2fdbfb4d
AB
2061 ro_magicalize:
2062 SvREADONLY_on(GvSVn(gv));
924ba076 2063 /* FALLTHROUGH */
6361f656 2064 case '0': /* $0 */
6361f656
AB
2065 case '^': /* $^ */
2066 case '~': /* $~ */
2067 case '=': /* $= */
2068 case '%': /* $% */
2069 case '.': /* $. */
2070 case '(': /* $( */
2071 case ')': /* $) */
2072 case '<': /* $< */
2073 case '>': /* $> */
2074 case '\\': /* $\ */
2075 case '/': /* $/ */
4505a31f 2076 case '|': /* $| */
9cdac2a2 2077 case '$': /* $$ */
cc4c2da6
NC
2078 case '\001': /* $^A */
2079 case '\003': /* $^C */
2080 case '\004': /* $^D */
2081 case '\005': /* $^E */
2082 case '\006': /* $^F */
cc4c2da6
NC
2083 case '\011': /* $^I, NOT \t in EBCDIC */
2084 case '\016': /* $^N */
2085 case '\017': /* $^O */
2086 case '\020': /* $^P */
2087 case '\024': /* $^T */
2088 case '\027': /* $^W */
2089 magicalize:
ad64d0ec 2090 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2091 break;
e521374c 2092
cc4c2da6 2093 case '\014': /* $^L */
76f68e9b 2094 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2095 break;
6361f656 2096 case ';': /* $; */
76f68e9b 2097 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2098 break;
6361f656 2099 case ']': /* $] */
cc4c2da6 2100 {
3638bf15 2101 SV * const sv = GvSV(gv);
d7aa5382 2102 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2103 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
2104 GvSV(gv) = vnumify(PL_patchlevel);
2105 SvREADONLY_on(GvSV(gv));
2106 SvREFCNT_dec(sv);
93a17b20
LW
2107 }
2108 break;
cc4c2da6
NC
2109 case '\026': /* $^V */
2110 {
3638bf15 2111 SV * const sv = GvSV(gv);
f9be5ac8
DM
2112 GvSV(gv) = new_version(PL_patchlevel);
2113 SvREADONLY_on(GvSV(gv));
2114 SvREFCNT_dec(sv);
16070b82
GS
2115 }
2116 break;
ea238638
FC
2117 case 'a':
2118 case 'b':
dc3e91f6 2119 if (sv_type == SVt_PV)
ea238638 2120 GvMULTI_on(gv);
cc4c2da6 2121 }
79072805 2122 }
930867a8
BF
2123
2124 return addmg;
71c35c05
BF
2125}
2126
070dc475
BF
2127/* This function is called when the stash already holds the GV of the magic
2128 * variable we're looking for, but we need to check that it has the correct
2129 * kind of magic. For example, if someone first uses $! and then %!, the
2130 * latter would end up here, and we add the Errno tie to the HASH slot of
2131 * the *! glob.
2132 */
2133PERL_STATIC_INLINE void
2134S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2135{
2136 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2137
2138 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2139 if (*name == '!')
2140 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2141 else if (*name == '-' || *name == '+')
2142 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2143 } else if (sv_type == SVt_PV) {
2144 if (*name == '*' || *name == '#') {
2145 /* diag_listed_as: $* is no longer supported */
2146 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2147 WARN_SYNTAX),
2148 "$%c is no longer supported", *name);
2149 }
2150 }
2151 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2152 switch (*name) {
2153 case '[':
2154 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2155 break;
2156#ifdef PERL_SAWAMPERSAND
2157 case '`':
2158 PL_sawampersand |= SAWAMPERSAND_LEFT;
2159 (void)GvSVn(gv);
2160 break;
2161 case '&':
2162 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2163 (void)GvSVn(gv);
2164 break;
2165 case '\'':
2166 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2167 (void)GvSVn(gv);
2168 break;
2169#endif
2170 }
2171 }
2172}
2173
71c35c05
BF
2174GV *
2175Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2176 const svtype sv_type)
2177{
71c35c05
BF
2178 const char *name = nambeg;
2179 GV *gv = NULL;
2180 GV**gvp;
2181 STRLEN len;
2182 HV *stash = NULL;
2183 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2184 const I32 no_expand = flags & GV_NOEXPAND;
2185 const I32 add = flags & ~GV_NOADD_MASK;
2186 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2187 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF
2188 const char *const name_end = nambeg + full_len;
2189 U32 faking_it;
2190
2191 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2192
2193 /* If we have GV_NOTQUAL, the caller promised that
2194 * there is no stash, so we can skip the check.
2195 * Similarly if full_len is 0, since then we're
2196 * dealing with something like *{""} or ""->foo()
2197 */
2198 if ((flags & GV_NOTQUAL) || !full_len) {
2199 len = full_len;
2200 }
2201 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2202 if (name == name_end) return gv;
2203 }
2204 else {
2205 return NULL;
2206 }
2207
2208 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2209 return NULL;
2210 }
2211
2212 /* By this point we should have a stash and a name */
c161da64 2213 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF
2214 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2215 if (addmg) gv = (GV *)newSV(0);
2216 else return NULL;
2217 }
2218 else gv = *gvp, addmg = 0;
2219 /* From this point on, addmg means gv has not been inserted in the
2220 symtab yet. */
2221
2222 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF
2223 /* The GV already exists, so return it, but check if we need to do
2224 * anything else with it before that.
2225 */
71c35c05 2226 if (add) {
c002ae9a
BF
2227 /* This is the heuristic that handles if a variable triggers the
2228 * 'used only once' warning. If there's already a GV in the stash
2229 * with this name, then we assume that the variable has been used
2230 * before and turn its MULTI flag on.
2231 * It's a heuristic because it can easily be "tricked", like with
2232 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2233 * not warning about $main::foo being used just once
2234 */
71c35c05
BF
2235 GvMULTI_on(gv);
2236 gv_init_svtype(gv, sv_type);
2237 /* You reach this path once the typeglob has already been created,
2238 either by the same or a different sigil. If this path didn't
2239 exist, then (say) referencing $! first, and %! second would
2240 mean that %! was not handled correctly. */
2241 if (len == 1 && stash == PL_defstash) {
070dc475 2242 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF
2243 }
2244 else if (len == 3 && sv_type == SVt_PVAV
2245 && strnEQ(name, "ISA", 3)
2246 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2247 gv_magicalize_isa(gv);
2248 }
2249 return gv;
2250 } else if (no_init) {
2251 assert(!addmg);
2252 return gv;
c002ae9a
BF
2253 }
2254 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2255 * don't expand it to a glob. This is an optimization so that things
2256 * copying constants over, like Exporter, don't have to be rewritten
2257 * to take into account that you can store more than just globs in
2258 * stashes.
2259 */
2260 else if (no_expand && SvROK(gv)) {
71c35c05
BF
2261 assert(!addmg);
2262 return gv;
2263 }
2264
2265 /* Adding a new symbol.
2266 Unless of course there was already something non-GV here, in which case
2267 we want to behave as if there was always a GV here, containing some sort
2268 of subroutine.
2269 Otherwise we run the risk of creating things like GvIO, which can cause
2270 subtle bugs. eg the one that tripped up SQL::Translator */
2271
2272 faking_it = SvOK(gv);
2273
2274 if (add & GV_ADDWARN)
2275 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2276 "Had to create %"UTF8f" unexpectedly",
2277 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2278 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2279
9e5de6ae 2280 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF
2281 GvMULTI_on(gv) ;
2282
930867a8
BF
2283 /* First, store the gv in the symtab if we're adding magic,
2284 * but only for non-empty GVs
2285 */
2286#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2287 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2288
2289 if ( addmg && !GvEMPTY(gv) ) {
2290 (void)hv_store(stash,name,len,(SV *)gv,0);
2291 }
2292
71c35c05 2293 /* set up magic where warranted */
930867a8
BF
2294 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2295 /* See 23496c6 */
2296 if (GvEMPTY(gv)) {
2297 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2298 /* The GV was and still is "empty", except that now
2299 * it has the magic flags turned on, so we want it
2300 * stored in the symtab.
2301 */
2302 (void)hv_store(stash,name,len,(SV *)gv,0);
2303 }
2304 else {
2305 /* Most likely the temporary GV created above */
2306 SvREFCNT_dec_NN(gv);
2307 gv = NULL;
2308 }
2309 }
2310 }
71c35c05 2311
e6066781 2312 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2313 return gv;
79072805
LW
2314}
2315
2316void
35a4481c 2317Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2318{
ed60a868 2319 const char *name;
35a4481c 2320 const HV * const hv = GvSTASH(gv);
7918f24d
NC
2321
2322 PERL_ARGS_ASSERT_GV_FULLNAME4;
2323
666ea192 2324 sv_setpv(sv, prefix ? prefix : "");
a0288114 2325
52a6327b 2326 if (hv && (name = HvNAME(hv))) {
ed60a868
FC
2327 const STRLEN len = HvNAMELEN(hv);
2328 if (keepmain || strnNE(name, "main", len)) {
2329 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2330 sv_catpvs(sv,"::");
ed60a868 2331 }
43693395 2332 }
ed60a868 2333 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2334 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2335}
2336
2337void
35a4481c 2338Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2339{
099be4f1 2340 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2341
2342 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2343
46c461b5 2344 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2345}
2346
39a65960
DM
2347
2348/* recursively scan a stash and any nested stashes looking for entries
2349 * that need the "only used once" warning raised
2350 */
2351
79072805 2352void
51da40ed 2353Perl_gv_check(pTHX_ HV *stash)
79072805 2354{
eb578fdb 2355 I32 i;
463ee0b2 2356
7918f24d
NC
2357 PERL_ARGS_ASSERT_GV_CHECK;
2358
8990e307
LW
2359 if (!HvARRAY(stash))
2360 return;
90754377
DM
2361
2362 assert(SvOOK(stash));
90754377 2363
a0d0e21e 2364 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2365 const HE *entry;
90754377 2366 /* mark stash is being scanned, to avoid recursing */
339441ef 2367 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2368 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2369 GV *gv;
b7787f18 2370 HV *hv;
dc437b57 2371 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2372 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2373 {
90754377
DM
2374 if (hv != PL_defstash && hv != stash
2375 && !(SvOOK(hv)
2376 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2377 )
a0d0e21e
LW
2378 gv_check(hv); /* nested package */
2379 }
ecad31f0
BF
2380 else if ( *HeKEY(entry) != '_'
2381 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2382 const char *file;
159b6efe 2383 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2384 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2385 continue;
1d7c1841 2386 file = GvFILE(gv);
1d7c1841 2387 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC
2388#ifdef USE_ITHREADS
2389 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2390#else
2391 CopFILEGV(PL_curcop)
2392 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2393#endif
9014280d 2394 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC
2395 "Name \"%"HEKf"::%"HEKf
2396 "\" used only once: possible typo",
2397 HEKfARG(HvNAME_HEK(stash)),
2398 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2399 }
79072805 2400 }
339441ef 2401 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW
2402 }
2403}
2404
2405GV *
9cc50d5b 2406Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2407{
9cc50d5b 2408 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2409 assert(!(flags & ~SVf_UTF8));
7918f24d 2410
b17a0679
FC
2411 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2412 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF
2413 (long)PL_gensym++),
2414 GV_ADD, SVt_PVGV);
79072805
LW
2415}
2416
2417/* hopefully this is only called on local symbol table entries */
2418
2419GP*
864dbfa3 2420Perl_gp_ref(pTHX_ GP *gp)
79072805 2421{
1d7c1841 2422 if (!gp)
d4c19fe8 2423 return NULL;
79072805 2424 gp->gp_refcnt++;
44a8e56a
PP
2425 if (gp->gp_cv) {
2426 if (gp->gp_cvgen) {
e1a479c5
BB
2427 /* If the GP they asked for a reference to contains
2428 a method cache entry, clear it first, so that we
2429 don't infect them with our cached entry */
e7881358 2430 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2431 gp->gp_cv = NULL;
44a8e56a
PP
2432 gp->gp_cvgen = 0;
2433 }
44a8e56a 2434 }
79072805 2435 return gp;
79072805
LW
2436}
2437
2438void
864dbfa3 2439Perl_gp_free(pTHX_ GV *gv)
79072805 2440{
79072805 2441 GP* gp;
b0d55c99 2442 int attempts = 100;
79072805 2443
f7877b28 2444 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2445 return;
f248d071 2446 if (gp->gp_refcnt == 0) {
9b387841
NC
2447 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2448 "Attempt to free unreferenced glob pointers"
2449 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2450 return;
2451 }
4571f4a7 2452 if (gp->gp_refcnt > 1) {
bc81b34d 2453 borrowed:
748a9306
LW
2454 if (gp->gp_egv == gv)
2455 gp->gp_egv = 0;
4571f4a7 2456 gp->gp_refcnt--;
c43ae56f 2457 GvGP_set(gv, NULL);
79072805 2458 return;
748a9306 2459 }
79072805 2460
b0d55c99
FC
2461 while (1) {
2462 /* Copy and null out all the glob slots, so destructors do not see
2463 freed SVs. */
2464 HEK * const file_hek = gp->gp_file_hek;
2465 SV * const sv = gp->gp_sv;
2466 AV * const av = gp->gp_av;
2467 HV * const hv = gp->gp_hv;
2468 IO * const io = gp->gp_io;
2469 CV * const cv = gp->gp_cv;
2470 CV * const form = gp->gp_form;
2471
2472 gp->gp_file_hek = NULL;
2473 gp->gp_sv = NULL;
2474 gp->gp_av = NULL;
2475 gp->gp_hv = NULL;
2476 gp->gp_io = NULL;
2477 gp->gp_cv = NULL;
2478 gp->gp_form = NULL;
2479
2480 if (file_hek)
2481 unshare_hek(file_hek);
2482
2483 SvREFCNT_dec(sv);
2484 SvREFCNT_dec(av);
2485 /* FIXME - another reference loop GV -> symtab -> GV ?
2486 Somehow gp->gp_hv can end up pointing at freed garbage. */
2487 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2488 const HEK *hvname_hek = HvNAME_HEK(hv);
10bafe90 2489 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", HEKfARG(hvname_hek)));
c2242065 2490 if (PL_stashcache && hvname_hek)
0ca9877d 2491 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
b0d55c99
FC
2492 SvREFCNT_dec(hv);
2493 }
2494 SvREFCNT_dec(io);
2495 SvREFCNT_dec(cv);
2496 SvREFCNT_dec(form);
2497
bc81b34d
FC
2498 /* Possibly reallocated by a destructor */
2499 gp = GvGP(gv);
2500
b0d55c99
FC
2501 if (!gp->gp_file_hek
2502 && !gp->gp_sv
2503 && !gp->gp_av
2504 && !gp->gp_hv
2505 && !gp->gp_io
2506 && !gp->gp_cv
2507 && !gp->gp_form) break;
2508
2509 if (--attempts == 0) {
2510 Perl_die(aTHX_
2511 "panic: gp_free failed to free glob pointer - "
2512 "something is repeatedly re-creating entries"
2513 );
2514 }
13207a71 2515 }
748a9306 2516
bc81b34d
FC
2517 /* Possibly incremented by a destructor doing glob assignment */
2518 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2519 Safefree(gp);
c43ae56f 2520 GvGP_set(gv, NULL);
79072805
LW
2521}
2522
d460ef45
NIS
2523int
2524Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2525{
53c1dcc0
AL
2526 AMT * const amtp = (AMT*)mg->mg_ptr;
2527 PERL_UNUSED_ARG(sv);
dd374669 2528
7918f24d
NC
2529 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2530
d460ef45
NIS
2531 if (amtp && AMT_AMAGIC(amtp)) {
2532 int i;
2533 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2534 CV * const cv = amtp->table[i];
b37c2d43 2535 if (cv) {
e7881358 2536 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2537 amtp->table[i] = NULL;
d460ef45
NIS
2538 }
2539 }
2540 }
2541 return 0;
2542}
2543
a0d0e21e 2544/* Updates and caches the CV's */
c3a9a790
RGS
2545/* Returns:
2546 * 1 on success and there is some overload
2547 * 0 if there is no overload
2548 * -1 if some error occurred and it couldn't croak
2549 */
a0d0e21e 2550
c3a9a790 2551int
242f8760 2552Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2553{
ad64d0ec 2554 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2555 AMT amt;
9b439311 2556 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2557 U32 newgen;
a0d0e21e 2558
7918f24d
NC
2559 PERL_ARGS_ASSERT_GV_AMUPDATE;
2560
9b439311 2561 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2562 if (mg) {
2563 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2564 if (amtp->was_ok_sub == newgen) {
8c34e50d 2565 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2566 }
ad64d0ec 2567 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2568 }
a0d0e21e 2569
bfcb3514 2570 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2571
d460ef45 2572 Zero(&amt,1,AMT);
e1a479c5 2573 amt.was_ok_sub = newgen;
a6006777
PP
2574 amt.fallback = AMGfallNO;
2575 amt.flags = 0;
2576
a6006777 2577 {
8c34e50d
FC
2578 int filled = 0;
2579 int i;
3d147ac2
DM
2580 bool deref_seen = 0;
2581
a6006777 2582
3866ea3b 2583 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2584
89ffc314 2585 /* Try to find via inheritance. */
e6919483 2586 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2587 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2588 CV* cv;
89ffc314
IZ
2589
2590 if (!gv)
3866ea3b
FC
2591 {
2592 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2593 goto no_table;
3866ea3b
FC
2594 }
2595#ifdef PERL_DONT_CREATE_GVSV
2596 else if (!sv) {
6f207bd3 2597 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC
2598 }
2599#endif
79c9643d
JL
2600 else if (SvTRUE(sv))
2601 /* don't need to set overloading here because fallback => 1
2602 * is the default setting for classes without overloading */
89ffc314 2603 amt.fallback=AMGfallYES;
79c9643d
JL
2604 else if (SvOK(sv)) {
2605 amt.fallback=AMGfallNEVER;
386a5489 2606 filled = 1;
386a5489 2607 }
79c9643d 2608 else {
386a5489 2609 filled = 1;
386a5489 2610 }
a6006777 2611
3d147ac2 2612 assert(SvOOK(stash));
3d147ac2 2613 /* initially assume the worst */
339441ef 2614 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2615
8c34e50d 2616 for (i = 1; i < NofAMmeth; i++) {
6136c704 2617 const char * const cooky = PL_AMG_names[i];
32251b26 2618 /* Human-readable form, for debugging: */
8c34e50d 2619 const char * const cp = AMG_id2name(i);
d279ab82 2620 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2621
a0288114 2622 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2623 cp, HvNAME_get(stash)) );
611c1e95
IZ
2624 /* don't fill the cache while looking up!
2625 Creation of inheritance stubs in intermediate packages may
2626 conflict with the logic of runtime method substitution.
2627 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2628 then we could have created stubs for "(+0" in A and C too.
2629 But if B overloads "bool", we may want to use it for
2630 numifying instead of C's "+0". */
8c34e50d 2631 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2632 cv = 0;
56117e3e 2633 if (gv && (cv = GvCV(gv)) && CvGV(cv)) {
f0e9f182
FC
2634 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2635 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2636 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2637 && strEQ(hvname, "overload")) {
611c1e95
IZ
2638 /* This is a hack to support autoloading..., while
2639 knowing *which* methods were declared as overloaded. */
44a8e56a 2640 /* GvSV contains the name of the method. */
6136c704 2641 GV *ngv = NULL;
c69033f2 2642 SV *gvsv = GvSV(gv);
a0288114
AL
2643
2644 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2645 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2646 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2647 if (!gvsv || !SvPOK(gvsv)
7f415459 2648 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2649 {
a0288114 2650 /* Can be an import stub (created by "can"). */
242f8760 2651 if (destructing) {
c3a9a790 2652 return -1;
242f8760
RGS
2653 }
2654 else {
d66cca07
BF
2655 const SV * const name = (gvsv && SvPOK(gvsv))
2656 ? gvsv
2657 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2658 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF
2659 Perl_croak(aTHX_ "%s method \"%"SVf256
2660 "\" overloading \"%s\" "\
d0c0e7dd 2661 "in package \"%"HEKf256"\"",
242f8760
RGS
2662 (GvCVGEN(gv) ? "Stub found while resolving"
2663 : "Can't resolve"),
d66cca07 2664 SVfARG(name), cp,
d0c0e7dd 2665 HEKfARG(
d66cca07 2666 HvNAME_HEK(stash)
d0c0e7dd 2667 ));
242f8760 2668 }
44a8e56a 2669 }
dc848c6f 2670 cv = GvCV(gv = ngv);
f0e9f182 2671 }
44a8e56a 2672 }
b464bac0 2673 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2674 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2675 GvNAME(CvGV(cv))) );
2676 filled = 1;
611c1e95 2677 } else if (gv) { /* Autoloaded... */
ea726b52 2678 cv = MUTABLE_CV(gv);
611c1e95 2679 filled = 1;
44a8e56a 2680 }
ea726b52 2681 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM
2682
2683 if (gv) {
2684 switch (i) {
2685 case to_sv_amg:
2686 case to_av_amg:
2687 case to_hv_amg:
2688 case to_gv_amg:
2689 case to_cv_amg:
2690 case nomethod_amg:
2691 deref_seen = 1;
2692 break;
2693 }
2694 }
a0d0e21e 2695 }
3d147ac2 2696 if (!deref_seen)
45479970
DM
2697 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2698 * NB - aux var invalid here, HvARRAY() could have been
2699 * reallocated since it was assigned to */
2700 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2701
a0d0e21e 2702 if (filled) {
a6006777 2703 AMT_AMAGIC_on(&amt);
ad64d0ec 2704 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2705 (char*)&amt, sizeof(AMT));
8c34e50d 2706 return TRUE;
a0d0e21e
LW
2707 }
2708 }
a6006777 2709 /* Here we have no table: */
8c34e50d 2710 no_table:
a6006777 2711 AMT_AMAGIC_off(&amt);
ad64d0ec 2712 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2713 (char*)&amt, sizeof(AMTS));
c3a9a790 2714 return 0;
a0d0e21e
LW
2715}
2716
32251b26
IZ
2717
2718CV*
2719Perl_gv_handler(pTHX_ HV *stash, I32 id)
2720{
3f8f4626 2721 MAGIC *mg;
32251b26 2722 AMT *amtp;
e1a479c5 2723 U32 newgen;
9b439311 2724 struct mro_meta* stash_meta;
32251b26 2725
bfcb3514 2726 if (!stash || !HvNAME_get(stash))
601f1833 2727 return NULL;
e1a479c5 2728
9b439311
BB
2729 stash_meta = HvMROMETA(stash);
2730 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2731
ad64d0ec 2732 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2733 if (!mg) {
2734 do_update:
8c34e50d 2735 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2736 return NULL;
ad64d0ec 2737 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2738 }
a9fd4e40 2739 assert(mg);
32251b26 2740 amtp = (AMT*)mg->mg_ptr;
66978156 2741 if ( amtp->was_ok_sub != newgen )
32251b26 2742 goto do_update;
3ad83ce7 2743 if (AMT_AMAGIC(amtp)) {
b7787f18 2744 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2745 if (ret && isGV(ret)) { /* Autoloading stab */
2746 /* Passing it through may have resulted in a warning
2747 "Inherited AUTOLOAD for a non-method deprecated", since
2748 our caller is going through a function call, not a method call.
2749 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2750 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2751
2752 if (gv && GvCV(gv))
2753 return GvCV(gv);
2754 }
2755 return ret;
2756 }
a0288114 2757
601f1833 2758 return NULL;
32251b26
IZ
2759}
2760
2761
6f1401dc
DM
2762/* Implement tryAMAGICun_MG macro.
2763 Do get magic, then see if the stack arg is overloaded and if so call it.
2764 Flags:
2765 AMGf_set return the arg using SETs rather than assigning to
2766 the targ
2767 AMGf_numeric apply sv_2num to the stack arg.
2768*/
2769
2770bool
2771Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM
2772 dSP;
2773 SV* tmpsv;
2774 SV* const arg = TOPs;
2775
2776 SvGETMAGIC(arg);
2777
9f8bf298
NC
2778 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2779 AMGf_noright | AMGf_unary))) {
6f1401dc
DM
2780 if (flags & AMGf_set) {
2781 SETs(tmpsv);
2782 }
2783 else {
2784 dTARGET;
2785 if (SvPADMY(TARG)) {
2786 sv_setsv(TARG, tmpsv);
2787 SETTARG;
2788 }
2789 else
2790 SETs(tmpsv);
2791 }
2792 PUTBACK;
2793 return TRUE;
2794 }
2795
2796 if ((flags & AMGf_numeric) && SvROK(arg))
2797 *sp = sv_2num(arg);
2798 return FALSE;
2799}
2800
2801
2802/* Implement tryAMAGICbin_MG macro.
2803 Do get magic, then see if the two stack args are overloaded and if so
2804 call it.
2805 Flags:
2806 AMGf_set return the arg using SETs rather than assigning to
2807 the targ
2808 AMGf_assign op may be called as mutator (eg +=)
2809 AMGf_numeric apply sv_2num to the stack arg.
2810*/
2811
2812bool
2813Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM
2814 dSP;
2815 SV* const left = TOPm1s;
2816 SV* const right = TOPs;
2817
2818 SvGETMAGIC(left);
2819 if (left != right)
2820 SvGETMAGIC(right);
2821
2822 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2823 SV * const tmpsv = amagic_call(left, right, method,
2824 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2825 if (tmpsv) {
2826 if (flags & AMGf_set) {
2827 (void)POPs;
2828 SETs(tmpsv);
2829 }
2830 else {
2831 dATARGET;
2832 (void)POPs;
2833 if (opASSIGN || SvPADMY(TARG)) {
2834 sv_setsv(TARG, tmpsv);
2835 SETTARG;
2836 }
2837 else
2838 SETs(tmpsv);
2839 }
2840 PUTBACK;
2841 return TRUE;
2842 }
2843 }
75ea7a12
FC
2844 if(left==right && SvGMAGICAL(left)) {
2845 SV * const left = sv_newmortal();
2846 *(sp-1) = left;
2847 /* Print the uninitialized warning now, so it includes the vari-
2848 able name. */
2849 if (!SvOK(right)) {
2850 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2851 sv_setsv_flags(left, &PL_sv_no, 0);
2852 }
2853 else sv_setsv_flags(left, right, 0);
2854 SvGETMAGIC(right);
2855 }
6f1401dc 2856 if (flags & AMGf_numeric) {
75ea7a12
FC
2857 if (SvROK(TOPm1s))
2858 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
2859 if (SvROK(right))
2860 *sp = sv_2num(right);
2861 }
2862 return FALSE;
2863}
2864
25a9ffce
NC
2865SV *
2866Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2867 SV *tmpsv = NULL;
3d147ac2 2868 HV *stash;
25a9ffce
NC
2869
2870 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2871
3d147ac2
DM
2872 if (!SvAMAGIC(ref))
2873 return ref;
2874 /* return quickly if none of the deref ops are overloaded */
2875 stash = SvSTASH(SvRV(ref));
2876 assert(SvOOK(stash));
2877 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2878 return ref;
2879
2880 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC
2881 AMGf_noright | AMGf_unary))) {
2882 if (!SvROK(tmpsv))
2883 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2884 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2885 /* Bail out if it returns us the same reference. */
2886 return tmpsv;
2887 }
2888 ref = tmpsv;
3d147ac2
DM
2889 if (!SvAMAGIC(ref))
2890 break;
25a9ffce
NC
2891 }
2892 return tmpsv ? tmpsv : ref;
2893}
6f1401dc 2894
8d569291
FC
2895bool
2896Perl_amagic_is_enabled(pTHX_ int method)
2897{
2898 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2899
2900 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2901
2902 if ( !lex_mask || !SvOK(lex_mask) )
2903 /* overloading lexically disabled */
2904 return FALSE;
2905 else if ( lex_mask && SvPOK(lex_mask) ) {
2906 /* we have an entry in the hints hash, check if method has been
2907 * masked by overloading.pm */
2908 STRLEN len;
2909 const int offset = method / 8;
2910 const int bit = method % 8;
2911 char *pv = SvPV(lex_mask, len);
2912
2913 /* Bit set, so this overloading operator is disabled */
2914 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2915 return FALSE;
2916 }
2917 return TRUE;
2918}
2919
a0d0e21e 2920SV*
864dbfa3 2921Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2922{
27da23d5 2923 dVAR;
b267980d 2924 MAGIC *mg;
9c5ffd7c 2925 CV *cv=NULL;
a0d0e21e 2926 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2927 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
2928 int off = 0, off1, lr = 0, notfound = 0;
2929 int postpr = 0, force_cpy = 0;
2930 int assign = AMGf_assign & flags;
2931 const int assignshift = assign ? 1 : 0;
bf5522a1 2932 int use_default_op = 0;
67288365 2933 int force_scalar = 0;
497b47a8
JH
2934#ifdef DEBUGGING
2935 int fl=0;
497b47a8 2936#endif
25716404 2937 HV* stash=NULL;
7918f24d
NC
2938
2939 PERL_ARGS_ASSERT_AMAGIC_CALL;
2940
e46c382e 2941 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2942 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK
2943 }
2944
a0d0e21e 2945 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2946 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2947 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2948 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2949 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2950 : NULL))
b267980d 2951 && ((cv = cvp[off=method+assignshift])
748a9306
LW
2952 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2953 * usual method */
497b47a8
JH
2954 (
2955#ifdef DEBUGGING
2956 fl = 1,
a0288114 2957#endif
497b47a8 2958 cv = cvp[off=method])))) {
a0d0e21e
LW
2959 lr = -1; /* Call method for left argument */
2960 } else {
2961 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2962 int logic;
2963
2964 /* look for substituted methods */
ee239bfe 2965 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
2966 switch (method) {
2967 case inc_amg:
ee239bfe
IZ
2968 force_cpy = 1;
2969 if ((cv = cvp[off=add_ass_amg])
2970 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2971 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2972 }
2973 break;
2974 case dec_amg:
ee239bfe
IZ
2975 force_cpy = 1;
2976 if ((cv = cvp[off = subtr_ass_amg])
2977 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2978 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2979 }
2980 break;
2981 case bool__amg:
2982 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2983 break;
2984 case numer_amg:
2985 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2986 break;
2987 case string_amg:
2988 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2989 break;
b7787f18
AL
2990 case not_amg:
2991 (void)((cv = cvp[off=bool__amg])
2992 || (cv = cvp[off=numer_amg])
2993 || (cv = cvp[off=string_amg]));
2ab54efd
MB
2994 if (cv)
2995 postpr = 1;
b7787f18 2996 break;
748a9306
LW
2997 case copy_amg:
2998 {
76e3520e
GS
2999 /*
3000 * SV* ref causes confusion with the interpreter variable of
3001 * the same name
3002 */
890ce7af 3003 SV* const tmpRef=SvRV(left);
76e3520e 3004 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
3005 /*
3006 * Just to be extra cautious. Maybe in some
3007 * additional cases sv_setsv is safe, too.
3008 */
890ce7af 3009 SV* const newref = newSVsv(tmpRef);
748a9306 3010 SvOBJECT_on(newref);
a1cd65be
FC
3011 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3012 delegate to the stash. */
85fbaab2 3013 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
3014 return newref;
3015 }
3016 }
3017 break;
a0d0e21e 3018 case abs_amg:
b267980d 3019 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3020 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3021 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3022 if (off1==lt_amg) {
890ce7af 3023 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3024 lt_amg,AMGf_noright);
3025 logic = SvTRUE(lessp);
3026 } else {
890ce7af 3027 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3028 ncmp_amg,AMGf_noright);
3029 logic = (SvNV(lessp) < 0);
3030 }
3031 if (logic) {
3032 if (off==subtr_amg) {
3033 right = left;
748a9306 3034 left = nullsv;
a0d0e21e
LW
3035 lr = 1;
3036 }
3037 } else {
3038 return left;
3039 }
3040 }
3041 break;
3042 case neg_amg:
155aba94 3043 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW
3044 right = left;
3045 left = sv_2mortal(newSViv(0));
3046 lr = 1;
3047 }
3048 break;
f216259d 3049 case int_amg:
f5284f61 3050 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3051 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3052 case regexp_amg:
b267980d
NIS
3053 /* FAIL safe */
3054 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3055
f5284f61
IZ
3056 case to_sv_amg:
3057 case to_av_amg:
3058 case to_hv_amg:
3059 case to_gv_amg:
3060 case to_cv_amg:
3061 /* FAIL safe */
b267980d 3062 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3063
a0d0e21e
LW
3064 default:
3065 goto not_found;
3066 }
3067 if (!cv) goto not_found;
3068 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3069 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3070 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3071 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3072 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3073 : NULL))
69815d08
RS
3074 && (cv = cvp[off=method])) { /* Method for right
3075 * argument found */
3076 lr=1;
bf5522a1
MB
3077 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3078 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
3079 && !(flags & AMGf_unary)) {
3080 /* We look for substitution for
3081 * comparison operations and
fc36a67e 3082 * concatenation */
a0d0e21e
LW
3083 if (method==concat_amg || method==concat_ass_amg
3084 || method==repeat_amg || method==repeat_ass_amg) {
3085 return NULL; /* Delegate operation to string conversion */
3086 }
3087 off = -1;
3088 switch (method) {
3089 case lt_amg:
3090 case le_amg:
3091 case gt_amg:
3092 case ge_amg:
3093 case eq_amg:
3094 case ne_amg:
2ab54efd
MB
3095 off = ncmp_amg;
3096 break;
a0d0e21e
LW
3097 case slt_amg:
3098 case sle_amg:
3099 case sgt_amg:
3100 case sge_amg:
3101 case seq_amg:
3102 case sne_amg:
2ab54efd
MB
3103 off = scmp_amg;
3104 break;
a0d0e21e 3105 }
bf5522a1
MB
3106 if (off != -1) {
3107 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3108 cv = ocvp[off];
3109 lr = -1;
3110 }
3111 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3112 cv = cvp[off];
3113 lr = 1;
3114 }
3115 }
3116 if (cv)
2ab54efd
MB
3117 postpr = 1;
3118 else
3119 goto not_found;
a0d0e21e 3120 } else {
a6006777 3121 not_found: /* No method found, either report or croak */
b267980d
NIS
3122 switch (method) {
3123 case to_sv_amg:
3124 case to_av_amg:
3125 case to_hv_amg:
3126 case to_gv_amg:
3127 case to_cv_amg:
3128 /* FAIL safe */
3129 return left; /* Delegate operation to standard mechanisms. */
b267980d 3130 }
a0d0e21e
LW
3131 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3132 notfound = 1; lr = -1;
3133 } else if (cvp && (cv=cvp[nomethod_amg])) {
3134 notfound = 1; lr = 1;
bf5522a1
MB
3135 } else if ((use_default_op =
3136 (!ocvp || oamtp->fallback >= AMGfallYES)
3137 && (!cvp || amtp->fallback >= AMGfallYES))
3138 && !DEBUG_o_TEST) {
4cc0ca18
NC
3139 /* Skip generating the "no method found" message. */
3140 return NULL;
a0d0e21e 3141 } else {
46fc3d4c 3142 SV *msg;
774d564b 3143 if (off==-1) off=method;
b267980d 3144 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF
3145 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3146 AMG_id2name(method + assignshift),
3147 (flags & AMGf_unary ? " " : "\n\tleft "),
3148 SvAMAGIC(left)?
3149 "in overloaded package ":
3150 "has no overloaded magic",
3151 SvAMAGIC(left)?
3152 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3153 SVfARG(&PL_sv_no),
3154 SvAMAGIC(right)?
3155 ",\n\tright argument in overloaded package ":
3156 (flags & AMGf_unary
3157 ? ""
3158 : ",\n\tright argument has no overloaded magic"),
3159 SvAMAGIC(right)?
3160 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3161 SVfARG(&PL_sv_no)));
bf5522a1 3162 if (use_default_op) {
d66cca07 3163 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3164 } else {
be2597df 3165 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW
3166 }
3167 return NULL;
3168 }
ee239bfe 3169 force_cpy = force_cpy || assign;
a0d0e21e
LW
3170 }
3171 }
67288365
JL
3172
3173 switch (method) {
3174 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3175 * operation. we need this to return a value, so that it can be assigned
3176 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3177 * increment or decrement was itself called in void context */
3178 case inc_amg:
3179 if (off == add_amg)
3180 force_scalar = 1;
3181 break;
3182 case dec_amg:
3183 if (off == subtr_amg)
3184 force_scalar = 1;
3185 break;
3186 /* in these cases, we're calling an assignment variant of an operator
3187 * (+= rather than +, for instance). regardless of whether it's a
3188 * fallback or not, it always has to return a value, which will be
3189 * assigned to the proper variable later */
3190 case add_amg:
3191 case subtr_amg:
3192 case mult_amg:
3193 case div_amg:
3194 case modulo_amg:
3195 case pow_amg:
3196 case lshift_amg:
3197 case rshift_amg:
3198 case repeat_amg:
3199 case concat_amg:
3200 case band_amg:
3201 case bor_amg:
3202 case bxor_amg:
3203 if (assign)
3204 force_scalar = 1;
3205 break;
3206 /* the copy constructor always needs to return a value */
3207 case copy_amg:
3208 force_scalar = 1;
3209 break;
3210 /* because of the way these are implemented (they don't perform the
3211 * dereferencing themselves, they return a reference that perl then
3212 * dereferences later), they always have to be in scalar context */
3213 case to_sv_amg:
3214 case to_av_amg:
3215 case to_hv_amg:
3216 case to_gv_amg:
3217 case to_cv_amg:
3218 force_scalar = 1;
3219 break;
3220 /* these don't have an op of their own; they're triggered by their parent
3221 * op, so the context there isn't meaningful ('$a and foo()' in void
3222 * context still needs to pass scalar context on to $a's bool overload) */
3223 case bool__amg:
3224 case numer_amg:
3225 case string_amg:
3226 force_scalar = 1;
3227 break;
3228 }
3229
497b47a8 3230#ifdef DEBUGGING
a0d0e21e 3231 if (!notfound) {
497b47a8 3232 DEBUG_o(Perl_deb(aTHX_
d66cca07 3233 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH
3234 AMG_id2name(off),
3235 method+assignshift==off? "" :
a0288114 3236 " (initially \"",
497b47a8
JH
3237 method+assignshift==off? "" :
3238 AMG_id2name(method+assignshift),
a0288114 3239 method+assignshift==off? "" : "\")",
497b47a8
JH
3240 flags & AMGf_unary? "" :
3241 lr==1 ? " for right argument": " for left argument",
3242 flags & AMGf_unary? " for argument" : "",
d66cca07 3243 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3244 fl? ",\n\tassignment variant used": "") );
ee239bfe 3245 }
497b47a8 3246#endif
748a9306
LW
3247 /* Since we use shallow copy during assignment, we need
3248 * to dublicate the contents, probably calling user-supplied
3249 * version of copy operator
3250 */
ee239bfe
IZ
3251 /* We need to copy in following cases:
3252 * a) Assignment form was called.
3253 * assignshift==1, assign==T, method + 1 == off
3254 * b) Increment or decrement, called directly.
3255 * assignshift==0, assign==0, method + 0 == off
3256 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3257 * assignshift==0, assign==T,
ee239bfe
IZ
3258 * force_cpy == T
3259 * d) Increment or decrement, translated to nomethod.
b267980d 3260 * assignshift==0, assign==0,
ee239bfe
IZ
3261 * force_cpy == T
3262 * e) Assignment form translated to nomethod.
3263 * assignshift==1, assign==T, method + 1 != off
3264 * force_cpy == T
3265 */
3266 /* off is method, method+assignshift, or a result of opcode substitution.
3267 * In the latter case assignshift==0, so only notfound case is important.
3268 */
73512201 3269 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3270 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3271 || force_cpy) )
6f1401dc 3272 {
1b38c28e
NC
3273 /* newSVsv does not behave as advertised, so we copy missing
3274 * information by hand */
3275 SV *tmpRef = SvRV(left);
3276 SV *rv_copy;
31d632c3 3277 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
3278 SvRV_set(left, rv_copy);
3279 SvSETMAGIC(left);
e7881358 3280 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3281 }
6f1401dc
DM
3282 }
3283
a0d0e21e
LW
3284 {
3285 dSP;
3286 BINOP myop;
3287 SV* res;
b7787f18 3288 const bool oldcatch = CATCH_GET;
67288365
JL
3289 I32 oldmark, nret;
3290 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3291
54310121 3292 CATCH_SET(TRUE);
a0d0e21e
LW
3293 Zero(&myop, 1, BINOP);
3294 myop.op_last = (OP *) &myop;
b37c2d43 3295 myop.op_next = NULL;
67288365
JL
3296 myop.op_flags = OPf_STACKED;
3297
3298 switch (gimme) {
3299 case G_VOID:
3300 myop.op_flags |= OPf_WANT_VOID;
3301 break;
3302 case G_ARRAY:
3303 if (flags & AMGf_want_list) {
3304 myop.op_flags |= OPf_WANT_LIST;
3305 break;
3306 }
3307 /* FALLTHROUGH */
3308 default:
3309 myop.op_flags |= OPf_WANT_SCALAR;
3310 break;
3311 }
a0d0e21e 3312
e788e7d3 3313 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3314 ENTER;
462e5cf6 3315 SAVEOP();
533c011a 3316 PL_op = (OP *) &myop;
3280af22 3317 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3318 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3319 Perl_pp_pushmark(aTHX);
a0d0e21e 3320
924508f0 3321 EXTEND(SP, notfound + 5);
a0d0e21e
LW
3322 PUSHs(lr>0? right: left);
3323 PUSHs(lr>0? left: right);
3280af22 3324 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3325 if (notfound) {
59cd0e26
NC
3326 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3327 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3328 }
ad64d0ec 3329 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3330 PUTBACK;
67288365 3331 oldmark = TOPMARK;
a0d0e21e 3332
139d0ce6 3333 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3334 CALLRUNOPS(aTHX);
a0d0e21e
LW
3335 LEAVE;
3336 SPAGAIN;
67288365
JL
3337 nret = SP - (PL_stack_base + oldmark);
3338
3339 switch (gimme) {
3340 case G_VOID:
3341 /* returning NULL has another meaning, and we check the context
3342 * at the call site too, so this can be differentiated from the
3343 * scalar case */
3344 res = &PL_sv_undef;
3345 SP = PL_stack_base + oldmark;
3346 break;
3347 case G_ARRAY: {
3348 if (flags & AMGf_want_list) {
3349 res = sv_2mortal((SV *)newAV());
3350 av_extend((AV *)res, nret);
3351 while (nret--)
3352 av_store((AV *)res, nret, POPs);
3353 break;
3354 }
3355 /* FALLTHROUGH */
3356 }
3357 default:
3358 res = POPs;
3359 break;
3360 }
a0d0e21e 3361
ebafeae7 3362 PUTBACK;
d3acc0f7 3363 POPSTACK;
54310121 3364 CATCH_SET(oldcatch);
a0d0e21e 3365
a0d0e21e 3366 if (postpr) {
b7787f18 3367 int ans;
a0d0e21e
LW
3368 switch (method) {
3369 case le_amg:
3370 case sle_amg:
3371 ans=SvIV(res)<=0; break;
3372 case lt_amg:
3373 case slt_amg:
3374 ans=SvIV(res)<0; break;
3375 case ge_amg:
3376 case sge_amg:
3377 ans=SvIV(res)>=0; break;
3378 case gt_amg:
3379 case sgt_amg:
3380 ans=SvIV(res)>0; break;
3381 case eq_amg:
3382 case seq_amg:
3383 ans=SvIV(res)==0; break;
3384 case ne_amg:
3385 case sne_amg:
3386 ans=SvIV(res)!=0; break;
3387 case inc_amg:
3388 case dec_amg:
bbce6d69 3389 SvSetSV(left,res); return left;
dc437b57 3390 case not_amg:
fe7ac86a 3391 ans=!SvTRUE(res); break;
b7787f18
AL
3392 default:
3393 ans=0; break;
a0d0e21e 3394 }
54310121 3395 return boolSV(ans);
748a9306
LW
3396 } else if (method==copy_amg) {
3397 if (!SvROK(res)) {
cea2e8a9 3398 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
3399 }
3400 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
3401 } else {
3402 return res;
3403 }
3404 }
3405}
c9d5ac95 3406
f5c1e807
NC
3407void
3408Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3409{
3410 dVAR;
acda4c6a 3411 U32 hash;
f5c1e807 3412
7918f24d 3413 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3414
acda4c6a
NC
3415 if (len > I32_MAX)
3416 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3417
ae8cc45f
NC
3418 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3419 unshare_hek(GvNAME_HEK(gv));
3420 }
3421
acda4c6a 3422 PERL_HASH(hash, name, len);
c60dbbc3 3423 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC
3424}
3425
66610fdd 3426/*
f7461760
Z
3427=for apidoc gv_try_downgrade
3428
2867cdbc
Z
3429If the typeglob C<gv> can be expressed more succinctly, by having
3430something other than a real GV in its place in the stash, replace it
3431with the optimised form. Basic requirements for this are that C<gv>
3432is a real typeglob, is sufficiently ordinary, and is only referenced
3433from its package. This function is meant to be used when a GV has been
3434looked up in part to see what was there, causing upgrading, but based
3435on what was found it turns out that the real GV isn't required after all.
3436
3437If C<gv> is a completely empty typeglob, it is deleted from the stash.
3438
3439If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3440sub, the typeglob is replaced with a scalar-reference placeholder that
3441more compactly represents the same thing.
f7461760
Z
3442
3443=cut
3444*/
3445
3446void
3447Perl_gv_try_downgrade(pTHX_ GV *gv)
3448{
3449 HV *stash;
3450 CV *cv;
3451 HEK *namehek;
3452 SV **gvp;
3453 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC
3454
3455 /* XXX Why and where does this leave dangling pointers during global
3456 destruction? */
627364f1 3457 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3458
2867cdbc 3459 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3460 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3461 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3462 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3463 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3464 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3465 return;
2be08ad1
FC
3466 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3467 return;
803f2748
DM
3468 if (SvMAGICAL(gv)) {
3469 MAGIC *mg;
3470 /* only backref magic is allowed */
3471 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3472 return;
3473 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3474 if (mg->mg_type != PERL_MAGIC_backref)
3475 return;
3476 }
3477 }
2867cdbc
Z
3478 cv = GvCV(gv);
3479 if (!cv) {
3480 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3481 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3482 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760
Z
3483 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3484 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3485 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3486 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3487 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3488 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z
3489 *gvp == (SV*)gv) {
3490 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3491 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z
3492 SvREFCNT(gv) = 0;
3493 sv_clear((SV*)gv);
3494 SvREFCNT(gv) = 1;
70e5f2b5 3495 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
f7461760
Z
3496 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3497 STRUCT_OFFSET(XPVIV, xiv_iv));
3498 SvRV_set(gv, value);
3499 }
3500}
3501
9e3fb20c
FC
3502GV *
3503Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3504{
3505 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3506 GV * const *gvp;
3507 PERL_ARGS_ASSERT_GV_OVERRIDE;
3508 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3509 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3510 gv = gvp ? *gvp : NULL;
3511 if (gv && !isGV(gv)) {
3512 if (!SvPCS_IMPORTED(gv)) return NULL;
3513 gv_init(gv, PL_globalstash, name, len, 0);
3514 return gv;
3515 }
3516 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3517}
3518
4aaa4757
FC
3519#include "XSUB.h"
3520
3521static void
3522core_xsub(pTHX_ CV* cv)
3523{
3524 Perl_croak(aTHX_
3525 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3526 );
3527}
3528
f7461760 3529/*
66610fdd
RGS
3530 * Local variables:
3531 * c-indentation-style: bsd
3532 * c-basic-offset: 4
14d04a33 3533 * indent-tabs-mode: nil
66610fdd
RGS
3534 * End:
3535 *
14d04a33 3536 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3537 */