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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW
20 */
21
ccfc67b7
JH
22/*
23=head1 GV Functions
166f8a29
DM
24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH
32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
6ffcffbd 37#include "overload.inc"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a 41static const char S_autoload[] = "AUTOLOAD";
3c81f0b3 42#define S_autolen (sizeof("AUTOLOAD")-1)
5c7983e5 43
13c59d41
MH
44GV *
45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13c59d41
MH
49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
13be902c 53 && SvTYPE((const SV *)gv) != SVt_PVLV
13c59d41 54 )
13be902c 55 ) {
bb85b28a 56 const char *what;
13c59d41 57 if (type == SVt_PVIO) {
bb85b28a
NC
58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
13c59d41 64 } else if (type == SVt_PVHV) {
bb85b28a
NC
65 what = "hash";
66 } else {
13c59d41 67 what = type == SVt_PVAV ? "array" : "scalar";
bb85b28a 68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896 72
13c59d41
MH
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
13c59d41
MH
83 if (!*where)
84 {
85 *where = newSV_type(type);
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
e17aed30 89 }
13c59d41 90 return gv;
79072805
LW
91}
92
93GV *
864dbfa3 94Perl_gv_fetchfile(pTHX_ const char *name)
79072805 95{
7918f24d 96 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC
97 return gv_fetchfile_flags(name, strlen(name), 0);
98}
99
100GV *
101Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
102 const U32 flags)
103{
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW
107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC
110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS
116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS
120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC
122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
c7a622b3 132 if (PERLDB_LINE_OR_SAVESRC && !GvAV(gv))
43e4250a 133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
53d95988
CS
134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW
136 return gv;
137}
138
62d55b22
NC
139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
796b6530 145C<NULL>.
62d55b22
NC
146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d 153 PERL_ARGS_ASSERT_GV_CONST_SV;
23491f1d 154 PERL_UNUSED_CONTEXT;
7918f24d 155
62d55b22
NC
156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
16a6e5a4 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV && SvTYPE(SvRV(gv)) != SVt_PVCV ? SvRV(gv) : NULL;
62d55b22
NC
159}
160
12816592
NC
161GP *
162Perl_newGP(pTHX_ GV *const gv)
163{
164 GP *gp;
19bad673 165 U32 hash;
19bad673
NC
166 const char *file;
167 STRLEN len;
2639089b 168#ifndef USE_ITHREADS
6b352265 169 GV *filegv;
2639089b 170#endif
c2587955 171 dVAR;
19bad673 172
7918f24d 173 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD
174 Newxz(gp, 1, GP);
175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
176#ifndef PERL_DONT_CREATE_GVSV
177 gp->gp_sv = newSV(0);
178#endif
7918f24d 179
c947bc1d
FC
180 /* PL_curcop may be null here. E.g.,
181 INIT { bless {} and exit }
182 frees INIT before looking up DESTROY (and creating *DESTROY)
183 */
2639089b
DD
184 if (PL_curcop) {
185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 186#ifdef USE_ITHREADS
2639089b
DD
187 if (CopFILE(PL_curcop)) {
188 file = CopFILE(PL_curcop);
189 len = strlen(file);
190 }
2639089b 191#else
cb0d3385
FC
192 filegv = CopFILEGV(PL_curcop);
193 if (filegv) {
194 file = GvNAME(filegv)+2;
195 len = GvNAMELEN(filegv)-2;
196 }
6e314d4f 197#endif
cb0d3385
FC
198 else goto no_file;
199 }
200 else {
201 no_file:
19bad673
NC
202 file = "";
203 len = 0;
204 }
f4890806
NC
205
206 PERL_HASH(hash, file, len);
f4890806 207 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC
208 gp->gp_refcnt = 1;
209
210 return gp;
211}
212
803f2748
DM
213/* Assign CvGV(cv) = gv, handling weak references.
214 * See also S_anonymise_cv_maybe */
215
216void
217Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
218{
ae77754a 219 GV * const oldgv = CvNAMED(cv) ? NULL : SvANY(cv)->xcv_gv_u.xcv_gv;
b290562e 220 HEK *hek;
803f2748
DM
221 PERL_ARGS_ASSERT_CVGV_SET;
222
223 if (oldgv == gv)
224 return;
225
226 if (oldgv) {
cfc1e951 227 if (CvCVGV_RC(cv)) {
e7881358 228 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM
229 CvCVGV_RC_off(cv);
230 }
803f2748 231 else {
803f2748
DM
232 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
233 }
234 }
db5cc3ee
FC
235 else if ((hek = CvNAME_HEK(cv))) {
236 unshare_hek(hek);
f3feca7a 237 CvLEXICAL_off(cv);
db5cc3ee 238 }
803f2748 239
5988f306 240 CvNAMED_off(cv);
b290562e 241 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 242 assert(!CvCVGV_RC(cv));
803f2748
DM
243
244 if (!gv)
245 return;
246
c794ca97
DM
247 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
248 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
249 else {
cfc1e951 250 CvCVGV_RC_on(cv);
803f2748
DM
251 SvREFCNT_inc_simple_void_NN(gv);
252 }
803f2748
DM
253}
254
ae77754a
FC
255/* Convert CvSTASH + CvNAME_HEK into a GV. Conceptually, all subs have a
256 GV, but for efficiency that GV may not in fact exist. This function,
257 called by CvGV, reifies it. */
258
259GV *
260Perl_cvgv_from_hek(pTHX_ CV *cv)
261{
262 GV *gv;
2eaf799e 263 SV **svp;
ae77754a
FC
264 PERL_ARGS_ASSERT_CVGV_FROM_HEK;
265 assert(SvTYPE(cv) == SVt_PVCV);
266 if (!CvSTASH(cv)) return NULL;
267 ASSUME(CvNAME_HEK(cv));
2eaf799e
FC
268 svp = hv_fetchhek(CvSTASH(cv), CvNAME_HEK(cv), 0);
269 gv = MUTABLE_GV(svp && *svp ? *svp : newSV(0));
270 if (!isGV(gv))
271 gv_init_pvn(gv, CvSTASH(cv), HEK_KEY(CvNAME_HEK(cv)),
ae77754a
FC
272 HEK_LEN(CvNAME_HEK(cv)),
273 SVf_UTF8 * !!HEK_UTF8(CvNAME_HEK(cv)));
2eaf799e
FC
274 if (!CvNAMED(cv)) { /* gv_init took care of it */
275 assert (SvANY(cv)->xcv_gv_u.xcv_gv == gv);
276 return gv;
277 }
ae77754a
FC
278 unshare_hek(CvNAME_HEK(cv));
279 CvNAMED_off(cv);
280 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
2eaf799e 281 if (svp && *svp) SvREFCNT_inc_simple_void_NN(gv);
ae77754a
FC
282 CvCVGV_RC_on(cv);
283 return gv;
284}
285
c68d9564
Z
286/* Assign CvSTASH(cv) = st, handling weak references. */
287
288void
289Perl_cvstash_set(pTHX_ CV *cv, HV *st)
290{
291 HV *oldst = CvSTASH(cv);
292 PERL_ARGS_ASSERT_CVSTASH_SET;
293 if (oldst == st)
294 return;
295 if (oldst)
296 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
297 SvANY(cv)->xcv_stash = st;
298 if (st)
299 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
300}
803f2748 301
e1104062
FC
302/*
303=for apidoc gv_init_pvn
304
305Converts a scalar into a typeglob. This is an incoercible typeglob;
306assigning a reference to it will assign to one of its slots, instead of
796b6530
KW
307overwriting it as happens with typeglobs created by C<SvSetSV>. Converting
308any scalar that is C<SvOK()> may produce unpredictable results and is reserved
e1104062
FC
309for perl's internal use.
310
311C<gv> is the scalar to be converted.
312
313C<stash> is the parent stash/package, if any.
314
04ec7e59
FC
315C<name> and C<len> give the name. The name must be unqualified;
316that is, it must not include the package name. If C<gv> is a
e1104062
FC
317stash element, it is the caller's responsibility to ensure that the name
318passed to this function matches the name of the element. If it does not
319match, perl's internal bookkeeping will get out of sync.
320
4a4088c4 321C<flags> can be set to C<SVf_UTF8> if C<name> is a UTF-8 string, or
04ec7e59 322the return value of SvUTF8(sv). It can also take the
796b6530 323C<GV_ADDMULTI> flag, which means to pretend that the GV has been
e1104062
FC
324seen before (i.e., suppress "Used once" warnings).
325
326=for apidoc gv_init
327
4a4088c4 328The old form of C<gv_init_pvn()>. It does not work with UTF-8 strings, as it
04ec7e59 329has no flags parameter. If the C<multi> parameter is set, the
796b6530 330C<GV_ADDMULTI> flag will be passed to C<gv_init_pvn()>.
e1104062
FC
331
332=for apidoc gv_init_pv
333
796b6530 334Same as C<gv_init_pvn()>, but takes a nul-terminated string for the name
e1104062
FC
335instead of separate char * and length parameters.
336
337=for apidoc gv_init_sv
338
796b6530 339Same as C<gv_init_pvn()>, but takes an SV * for the name instead of separate
e1104062
FC
340char * and length parameters. C<flags> is currently unused.
341
342=cut
343*/
344
463ee0b2 345void
04ec7e59 346Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF
347{
348 char *namepv;
349 STRLEN namelen;
350 PERL_ARGS_ASSERT_GV_INIT_SV;
351 namepv = SvPV(namesv, namelen);
352 if (SvUTF8(namesv))
353 flags |= SVf_UTF8;
04ec7e59 354 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF
355}
356
357void
04ec7e59 358Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF
359{
360 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 361 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF
362}
363
364void
04ec7e59 365Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 366{
3b6733bf
NC
367 const U32 old_type = SvTYPE(gv);
368 const bool doproto = old_type > SVt_NULL;
f9509170 369 char * const proto = (doproto && SvPOK(gv))
dad95a0a 370 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 371 : NULL;
49a54bbe 372 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 373 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 374 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 375 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 376
e6066781 377 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC
378 assert (!(proto && has_constant));
379
380 if (has_constant) {
2eaf799e 381 /* The constant has to be a scalar, array or subroutine. */
5c1f4d79 382 switch (SvTYPE(has_constant)) {
5c1f4d79 383 case SVt_PVHV:
5c1f4d79
NC
384 case SVt_PVFM:
385 case SVt_PVIO:
386 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
387 sv_reftype(has_constant, 0));
4bbde2f7 388 break;
81d52ecd 389
42d0e0b7 390 default: NOOP;
5c1f4d79 391 }
756cb477
NC
392 SvRV_set(gv, NULL);
393 SvROK_off(gv);
394 }
463ee0b2 395
3b6733bf
NC
396
397 if (old_type < SVt_PVGV) {
398 if (old_type >= SVt_PV)
399 SvCUR_set(gv, 0);
ad64d0ec 400 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 401 }
55d729e4
GS
402 if (SvLEN(gv)) {
403 if (proto) {
f880fe2f 404 SvPV_set(gv, NULL);
b162af07 405 SvLEN_set(gv, 0);
55d729e4
GS
406 SvPOK_off(gv);
407 } else
94010e71 408 Safefree(SvPVX_mutable(gv));
55d729e4 409 }
2e5b91de
NC
410 SvIOK_off(gv);
411 isGV_with_GP_on(gv);
12816592 412
c43ae56f 413 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC
414 GvSTASH(gv) = stash;
415 if (stash)
ad64d0ec 416 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 417 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC
418 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
419 GvMULTI_on(gv); /* _was_ mentioned */
2eaf799e
FC
420 if (has_constant && SvTYPE(has_constant) == SVt_PVCV) {
421 /* Not actually a constant. Just a regular sub. */
422 CV * const cv = (CV *)has_constant;
423 GvCV_set(gv,cv);
424 if (CvSTASH(cv) == stash && (
425 CvNAME_HEK(cv) == GvNAME_HEK(gv)
426 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
427 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
428 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
429 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
430 )
431 ))
432 CvGV_set(cv,gv);
433 }
434 else if (doproto) {
e3d2b9e7 435 CV *cv;
756cb477
NC
436 if (has_constant) {
437 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 438 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC
439 /* In case op.c:S_process_special_blocks stole it: */
440 if (!GvCV(gv))
c43ae56f 441 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 442 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC
443 /* If this reference was a copy of another, then the subroutine
444 must have been "imported", by a Perl space assignment to a GV
445 from a reference to CV. */
446 if (exported_constant)
447 GvIMPORTED_CV_on(gv);
186a5ba8 448 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 449 } else {
186a5ba8 450 cv = newSTUB(gv,1);
756cb477 451 }
55d729e4 452 if (proto) {
e3d2b9e7 453 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 454 SV_HAS_TRAILING_NUL);
e0260a5b 455 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS
456 }
457 }
463ee0b2
LW
458}
459
76e3520e 460STATIC void
e6066781 461S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 462{
13c59d41
MH
463 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
464
465 switch (sv_type) {
466 case SVt_PVIO:
467 (void)GvIOn(gv);
468 break;
469 case SVt_PVAV:
470 (void)GvAVn(gv);
471 break;
472 case SVt_PVHV:
473 (void)GvHVn(gv);
474 break;
c69033f2 475#ifdef PERL_DONT_CREATE_GVSV
13c59d41
MH
476 case SVt_NULL:
477 case SVt_PVCV:
478 case SVt_PVFM:
479 case SVt_PVGV:
480 break;
481 default:
482 if(GvSVn(gv)) {
483 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
484 If we just cast GvSVn(gv) to void, it ignores evaluating it for
485 its side effect */
486 }
c69033f2 487#endif
a0d0e21e
LW
488 }
489}
490
0f8d4b5e
FC
491static void core_xsub(pTHX_ CV* cv);
492
493static GV *
494S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 495 const char * const name, const STRLEN len)
0f8d4b5e
FC
496{
497 const int code = keyword(name, len, 1);
498 static const char file[] = __FILE__;
97021f77 499 CV *cv, *oldcompcv = NULL;
0f8d4b5e 500 int opnum = 0;
0f8d4b5e 501 bool ampable = TRUE; /* &{}-able */
97021f77
FC
502 COP *oldcurcop = NULL;
503 yy_parser *oldparser = NULL;
504 I32 oldsavestack_ix = 0;
0f8d4b5e
FC
505
506 assert(gv || stash);
507 assert(name);
0f8d4b5e 508
88b892d8
FC
509 if (!code) return NULL; /* Not a keyword */
510 switch (code < 0 ? -code : code) {
0f8d4b5e 511 /* no support for \&CORE::infix;
d885f758 512 no support for funcs that do not parse like funcs */
88b892d8 513 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 514 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 515 case KEY_default : case KEY_DESTROY:
88b892d8 516 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 517 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 518 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 519 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC
520 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
521 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
522 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 523 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 524 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 525 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 526 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 527 case KEY_state: case KEY_sub :
46bef06f 528 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC
529 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
530 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC
531 return NULL;
532 case KEY_chdir:
eb31eb35 533 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
73665bc4 534 case KEY_eof : case KEY_exec: case KEY_exists :
0f8d4b5e 535 case KEY_lstat:
bea284c8 536 case KEY_split:
0f8d4b5e
FC
537 case KEY_stat:
538 case KEY_system:
539 case KEY_truncate: case KEY_unlink:
0f8d4b5e
FC
540 ampable = FALSE;
541 }
542 if (!gv) {
543 gv = (GV *)newSV(0);
544 gv_init(gv, stash, name, len, TRUE);
545 }
7e68c38b 546 GvMULTI_on(gv);
0f8d4b5e
FC
547 if (ampable) {
548 ENTER;
549 oldcurcop = PL_curcop;
550 oldparser = PL_parser;
551 lex_start(NULL, NULL, 0);
552 oldcompcv = PL_compcv;
553 PL_compcv = NULL; /* Prevent start_subparse from setting
554 CvOUTSIDE. */
555 oldsavestack_ix = start_subparse(FALSE,0);
556 cv = PL_compcv;
557 }
558 else {
559 /* Avoid calling newXS, as it calls us, and things start to
560 get hairy. */
561 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
562 GvCV_set(gv,cv);
563 GvCVGEN(gv) = 0;
0f8d4b5e
FC
564 CvISXSUB_on(cv);
565 CvXSUB(cv) = core_xsub;
eacbb379 566 PoisonPADLIST(cv);
0f8d4b5e
FC
567 }
568 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
569 from PL_curcop. */
9b669ea1
DD
570 /* XSUBs can't be perl lang/perl5db.pl debugged
571 if (PERLDB_LINE_OR_SAVESRC)
572 (void)gv_fetchfile(file); */
0f8d4b5e
FC
573 CvFILE(cv) = (char *)file;
574 /* XXX This is inefficient, as doing things this order causes
575 a prototype check in newATTRSUB. But we have to do
576 it this order as we need an op number before calling
577 new ATTRSUB. */
578 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 579 if (stash)
73c02f15 580 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 581 if (ampable) {
4428fb0e
TC
582#ifdef DEBUGGING
583 CV *orig_cv = cv;
584#endif
0f8d4b5e 585 CvLVALUE_on(cv);
4428fb0e
TC
586 /* newATTRSUB will free the CV and return NULL if we're still
587 compiling after a syntax error */
e8f91c91 588 if ((cv = newATTRSUB_x(
7e68c38b 589 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC
590 NULL,NULL,
591 coresub_op(
592 opnum
593 ? newSVuv((UV)opnum)
594 : newSVpvn(name,len),
595 code, opnum
7e68c38b 596 ),
e8f91c91 597 TRUE
4428fb0e
TC
598 )) != NULL) {
599 assert(GvCV(gv) == orig_cv);
600 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
cd642408 601 && opnum != OP_UNDEF && opnum != OP_KEYS)
4428fb0e
TC
602 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
603 }
0f8d4b5e
FC
604 LEAVE;
605 PL_parser = oldparser;
606 PL_curcop = oldcurcop;
607 PL_compcv = oldcompcv;
608 }
4428fb0e
TC
609 if (cv) {
610 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
611 cv_set_call_checker(
612 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
613 );
614 SvREFCNT_dec(opnumsv);
615 }
616
0f8d4b5e
FC
617 return gv;
618}
619
954c1994 620/*
6c53d59b
FC
621=for apidoc gv_fetchmeth
622
623Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
624
e6919483
BF
625=for apidoc gv_fetchmeth_sv
626
627Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
628of an SV instead of a string/length pair.
629
630=cut
631*/
632
633GV *
634Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
635{
c290e187 636 char *namepv;
637 STRLEN namelen;
638 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
639 if (LIKELY(SvPOK_nog(namesv))) /* common case */
640 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, flags);
641 namepv = SvPV(namesv, namelen);
642 if (SvUTF8(namesv)) flags |= SVf_UTF8;
643 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF
644}
645
646/*
647=for apidoc gv_fetchmeth_pv
648
649Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
650instead of a string/length pair.
651
652=cut
653*/
654
655GV *
656Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
657{
658 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 659 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF
660}
661
662/*
663=for apidoc gv_fetchmeth_pvn
954c1994
GS
664
665Returns the glob with the given C<name> and a defined subroutine or
666C<NULL>. The glob lives in the given C<stash>, or in the stashes
796b6530 667accessible via C<@ISA> and C<UNIVERSAL::>.
954c1994
GS
668
669The argument C<level> should be either 0 or -1. If C<level==0>, as a
670side-effect creates a glob with the given C<name> in the given C<stash>
671which in the case of success contains an alias for the subroutine, and sets
e1a479c5 672up caching info for this glob.
954c1994 673
796b6530 674The only significant values for C<flags> are C<GV_SUPER> and C<SVf_UTF8>.
aae43805 675
796b6530 676C<GV_SUPER> indicates that we want to look up the method in the superclasses
aae43805 677of the C<stash>.
e6919483 678
aae43805 679The
954c1994 680GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 681visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 682the GV directly; instead, you should use the method's CV, which can be
b267980d 683obtained from the GV with the C<GvCV> macro.
954c1994
GS
684
685=cut
686*/
687
e1a479c5
BB
688/* NOTE: No support for tied ISA */
689
c6afe666 690PERL_STATIC_INLINE GV*
691S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 692{
463ee0b2 693 GV** gvp;
c6afe666 694 HE* he;
e1a479c5
BB
695 AV* linear_av;
696 SV** linear_svp;
697 SV* linear_sv;
aae43805 698 HV* cstash, *cachestash;
e1a479c5
BB
699 GV* candidate = NULL;
700 CV* cand_cv = NULL;
e1a479c5 701 GV* topgv = NULL;
bfcb3514 702 const char *hvname;
c6afe666 703 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 704 I32 items;
e1a479c5 705 U32 topgen_cmp;
04f3bf56 706 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 707
af09ea45
IK
708 /* UNIVERSAL methods should be callable without a stash */
709 if (!stash) {
e1a479c5 710 create = 0; /* probably appropriate */
da51bb9b 711 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK
712 return 0;
713 }
714
e1a479c5
BB
715 assert(stash);
716
bfcb3514
NC
717 hvname = HvNAME_get(stash);
718 if (!hvname)
e1a479c5 719 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 720
e1a479c5 721 assert(hvname);
55df6700 722 assert(name || meth);
463ee0b2 723
aae43805 724 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC
725 flags & GV_SUPER ? "SUPER " : "",
726 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 727
dd69841b 728 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 729
aae43805 730 if (flags & GV_SUPER) {
1a33a059
FC
731 if (!HvAUX(stash)->xhv_mro_meta->super)
732 HvAUX(stash)->xhv_mro_meta->super = newHV();
733 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC
734 }
735 else cachestash = stash;
736
e1a479c5 737 /* check locally for a real method or a cache entry */
c6afe666 738 he = (HE*)hv_common(
739 cachestash, meth, name, len, (flags & SVf_UTF8) ? HVhek_UTF8 : 0, create, NULL, 0
740 );
741 if (he) gvp = (GV**)&HeVAL(he);
742 else gvp = NULL;
743
e1a479c5
BB
744 if(gvp) {
745 topgv = *gvp;
0f8d4b5e 746 have_gv:
e1a479c5
BB
747 assert(topgv);
748 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC
749 {
750 if (!name)
751 name = SvPV_nomg(meth, len);
04ec7e59 752 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 753 }
e1a479c5
BB
754 if ((cand_cv = GvCV(topgv))) {
755 /* If genuine method or valid cache entry, use it */
756 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
757 return topgv;
758 }
759 else {
760 /* stale cache entry, junk it and move on */
e7881358 761 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM
762 GvCV_set(topgv, NULL);
763 cand_cv = NULL;
e1a479c5
BB
764 GvCVGEN(topgv) = 0;
765 }
766 }
767 else if (GvCVGEN(topgv) == topgen_cmp) {
768 /* cache indicates no such method definitively */
769 return 0;
770 }
aae43805
FC
771 else if (stash == cachestash
772 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 773 && strnEQ(hvname, "CORE", 4)
87566176 774 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 775 goto have_gv;
463ee0b2 776 }
79072805 777
aae43805 778 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB
779 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
780 items = AvFILLp(linear_av); /* no +1, to skip over self */
781 while (items--) {
782 linear_sv = *linear_svp++;
783 assert(linear_sv);
784 cstash = gv_stashsv(linear_sv, 0);
785
dd69841b 786 if (!cstash) {
ecad31f0 787 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 788 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 789 SVfARG(linear_sv),
d0c0e7dd 790 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB
791 continue;
792 }
9607fc9c 793
e1a479c5
BB
794 assert(cstash);
795
c60dbbc3 796 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC
797 if (!gvp) {
798 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
799 const char *hvname = HvNAME(cstash); assert(hvname);
800 if (strnEQ(hvname, "CORE", 4)
801 && (candidate =
87566176 802 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC
803 ))
804 goto have_candidate;
805 }
806 continue;
807 }
808 else candidate = *gvp;
809 have_candidate:
e1a479c5 810 assert(candidate);
04f3bf56 811 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 812 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
813 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
814 /*
815 * Found real method, cache method in topgv if:
816 * 1. topgv has no synonyms (else inheritance crosses wires)
817 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
818 */
819 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
820 CV *old_cv = GvCV(topgv);
821 SvREFCNT_dec(old_cv);
e1a479c5 822 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 823 GvCV_set(topgv, cand_cv);
e1a479c5
BB
824 GvCVGEN(topgv) = topgen_cmp;
825 }
826 return candidate;
827 }
828 }
9607fc9c 829
e1a479c5
BB
830 /* Check UNIVERSAL without caching */
831 if(level == 0 || level == -1) {
55df6700
FC
832 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
833 flags &~GV_SUPER);
e1a479c5
BB
834 if(candidate) {
835 cand_cv = GvCV(candidate);
836 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
837 CV *old_cv = GvCV(topgv);
838 SvREFCNT_dec(old_cv);
e1a479c5 839 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 840 GvCV_set(topgv, cand_cv);
e1a479c5
BB
841 GvCVGEN(topgv) = topgen_cmp;
842 }
843 return candidate;
844 }
845 }
846
847 if (topgv && GvREFCNT(topgv) == 1) {
848 /* cache the fact that the method is not defined */
849 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW
850 }
851
79072805
LW
852 return 0;
853}
854
c6afe666 855GV *
856Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
857{
858 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
859 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
860}
861
954c1994 862/*
460e5730
FC
863=for apidoc gv_fetchmeth_autoload
864
865This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
866parameter.
867
d21989ed 868=for apidoc gv_fetchmeth_sv_autoload
611c1e95 869
d21989ed
BF
870Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
871of an SV instead of a string/length pair.
872
873=cut
874*/
875
876GV *
877Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
878{
879 char *namepv;
880 STRLEN namelen;
881 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
882 namepv = SvPV(namesv, namelen);
883 if (SvUTF8(namesv))
884 flags |= SVf_UTF8;
885 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
886}
887
888/*
889=for apidoc gv_fetchmeth_pv_autoload
890
891Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
892instead of a string/length pair.
893
894=cut
895*/
896
897GV *
898Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
899{
900 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
901 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
902}
903
904/*
905=for apidoc gv_fetchmeth_pvn_autoload
906
796b6530 907Same as C<gv_fetchmeth_pvn()>, but looks for autoloaded subroutines too.
611c1e95
IZ
908Returns a glob for the subroutine.
909
910For an autoloaded subroutine without a GV, will create a GV even
796b6530 911if C<level < 0>. For an autoloaded subroutine without a stub, C<GvCV()>
611c1e95
IZ
912of the result may be zero.
913
796b6530 914Currently, the only significant value for C<flags> is C<SVf_UTF8>.
d21989ed 915
611c1e95
IZ
916=cut
917*/
918
919GV *
d21989ed 920Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 921{
499321d3 922 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 923
d21989ed 924 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 925
611c1e95 926 if (!gv) {
611c1e95
IZ
927 CV *cv;
928 GV **gvp;
929
930 if (!stash)
6136c704 931 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 932 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 933 return NULL;
d21989ed 934 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 935 return NULL;
611c1e95
IZ
936 cv = GvCV(gv);
937 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 938 return NULL;
611c1e95
IZ
939 /* Have an autoload */
940 if (level < 0) /* Cannot do without a stub */
d21989ed 941 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF
942 gvp = (GV**)hv_fetch(stash, name,
943 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 944 if (!gvp)
6136c704 945 return NULL;
611c1e95
IZ
946 return *gvp;
947 }
948 return gv;
949}
950
951/*
954c1994
GS
952=for apidoc gv_fetchmethod_autoload
953
954Returns the glob which contains the subroutine to call to invoke the method
955on the C<stash>. In fact in the presence of autoloading this may be the
796b6530 956glob for "AUTOLOAD". In this case the corresponding variable C<$AUTOLOAD> is
b267980d 957already setup.
954c1994
GS
958
959The third parameter of C<gv_fetchmethod_autoload> determines whether
960AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 961means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 962Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 963with a non-zero C<autoload> parameter.
954c1994 964
cec2d7b1
FC
965These functions grant C<"SUPER"> token
966as a prefix of the method name. Note
954c1994
GS
967that if you want to keep the returned glob for a long time, you need to
968check for it being "AUTOLOAD", since at the later time the call may load a
796b6530 969different subroutine due to C<$AUTOLOAD> changing its value. Use the glob
cec2d7b1 970created as a side effect to do this.
954c1994 971
cec2d7b1
FC
972These functions have the same side-effects as C<gv_fetchmeth> with
973C<level==0>. The warning against passing the GV returned by
974C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS
975
976=cut
977*/
978
dc848c6f 979GV *
864dbfa3 980Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 981{
547bb267
NC
982 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
983
256d1bb2
NC
984 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
985}
986
44130a26
BF
987GV *
988Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
989{
990 char *namepv;
991 STRLEN namelen;
992 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
993 namepv = SvPV(namesv, namelen);
994 if (SvUTF8(namesv))
995 flags |= SVf_UTF8;
996 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
997}
998
999GV *
1000Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1001{
1002 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1003 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1004}
1005
256d1bb2
NC
1006/* Don't merge this yet, as it's likely to get a len parameter, and possibly
1007 even a U32 hash */
1008GV *
44130a26 1009Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1010{
eb578fdb 1011 const char *nend;
c445ea15 1012 const char *nsplit = NULL;
a0d0e21e 1013 GV* gv;
0dae17bd 1014 HV* ostash = stash;
c94593d0 1015 const char * const origname = name;
ad64d0ec 1016 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
1017 const U32 autoload = flags & GV_AUTOLOAD;
1018 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1019 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1020
44130a26 1021 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1022
eff494dd 1023 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1024 stash = NULL;
c9bf4021
NC
1025 else {
1026 /* The only way stash can become NULL later on is if nsplit is set,
1027 which in turn means that there is no need for a SVt_PVHV case
1028 the error reporting code. */
1029 }
b267980d 1030
44130a26 1031 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 1032 if (*nend == '\'') {
a0d0e21e 1033 nsplit = nend;
c94593d0
NC
1034 name = nend + 1;
1035 }
1036 else if (*nend == ':' && *(nend + 1) == ':') {
1037 nsplit = nend++;
1038 name = nend + 1;
1039 }
a0d0e21e
LW
1040 }
1041 if (nsplit) {
7edbdc6b 1042 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 1043 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC
1044 stash = CopSTASH(PL_curcop);
1045 flags |= GV_SUPER;
cea2e8a9 1046 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1047 origname, HvENAME_get(stash), name) );
4633a7c4 1048 }
aae43805
FC
1049 else if ((nsplit - origname) >= 7 &&
1050 strnEQ(nsplit - 7, "::SUPER", 7)) {
1051 /* don't autovifify if ->NoSuchStash::SUPER::method */
1052 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
1053 if (stash) flags |= GV_SUPER;
1054 }
e189a56d 1055 else {
af09ea45 1056 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1057 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 1058 }
0dae17bd 1059 ostash = stash;
4633a7c4
LW
1060 }
1061
14d1dfbd 1062 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1063 if (!gv) {
7da9d78d
AB
1064 /* This is the special case that exempts Foo->import and
1065 Foo->unimport from being an error even if there's no
1066 import/unimport subroutine */
2f6e0fe7 1067 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1068 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1069 else if (autoload)
c8416c26
BF
1070 gv = gv_autoload_pvn(
1071 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1072 );
256d1bb2
NC
1073 if (!gv && do_croak) {
1074 /* Right now this is exclusively for the benefit of S_method_common
1075 in pp_hot.c */
1076 if (stash) {
15e6cdd9
DG
1077 /* If we can't find an IO::File method, it might be a call on
1078 * a filehandle. If IO:File has not been loaded, try to
1079 * require it first instead of croaking */
1080 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1081 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1082 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1083 STR_WITH_LEN("IO/File.pm"), 0,
1084 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1085 ) {
31b05a0f 1086 require_pv("IO/File.pm");
14d1dfbd 1087 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG
1088 if (gv)
1089 return gv;
1090 }
256d1bb2 1091 Perl_croak(aTHX_
b17a0679 1092 "Can't locate object method \"%"UTF8f
d0c0e7dd 1093 "\" via package \"%"HEKf"\"",
b17a0679 1094 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1095 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC
1096 }
1097 else {
ecad31f0 1098 SV* packnamesv;
256d1bb2 1099
256d1bb2 1100 if (nsplit) {
ecad31f0
BF
1101 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1102 SVs_TEMP | is_utf8);
256d1bb2 1103 } else {
017c5e4e 1104 packnamesv = error_report;
256d1bb2
NC
1105 }
1106
1107 Perl_croak(aTHX_
b17a0679
FC
1108 "Can't locate object method \"%"UTF8f
1109 "\" via package \"%"SVf"\""
ecad31f0 1110 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1111 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1112 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1113 }
1114 }
463ee0b2 1115 }
dc848c6f 1116 else if (autoload) {
9d4ba2ae 1117 CV* const cv = GvCV(gv);
09280a33
CS
1118 if (!CvROOT(cv) && !CvXSUB(cv)) {
1119 GV* stubgv;
1120 GV* autogv;
1121
0c028dca 1122 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS
1123 stubgv = gv;
1124 else {
1125 stubgv = CvGV(cv);
1126 if (GvCV(stubgv) != cv) /* orphaned import */
1127 stubgv = gv;
1128 }
c8416c26
BF
1129 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1130 GvNAME(stubgv), GvNAMELEN(stubgv),
1131 GV_AUTOLOAD_ISMETHOD
1132 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1133 if (autogv)
1134 gv = autogv;
1135 }
1136 }
44a8e56a
PP
1137
1138 return gv;
1139}
1140
1141GV*
0eeb01b9 1142Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1143{
1144 char *namepv;
1145 STRLEN namelen;
0fe84f7c 1146 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1147 namepv = SvPV(namesv, namelen);
1148 if (SvUTF8(namesv))
1149 flags |= SVf_UTF8;
0eeb01b9 1150 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1151}
1152
1153GV*
0eeb01b9 1154Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1155{
0fe84f7c 1156 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1157 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1158}
1159
1160GV*
0eeb01b9 1161Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1162{
44a8e56a
PP
1163 GV* gv;
1164 CV* cv;
1165 HV* varstash;
1166 GV* vargv;
1167 SV* varsv;
c8416c26
BF
1168 SV *packname = NULL;
1169 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1170
0fe84f7c 1171 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1172
7edbdc6b 1173 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1174 return NULL;
0dae17bd
GS
1175 if (stash) {
1176 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1177 STRLEN packname_len = 0;
1178 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1179 packname = newSVpvn_flags(packname_ptr, packname_len,
1180 SVs_TEMP | SvUTF8(stash));
5c284bb0 1181 stash = NULL;
0dae17bd 1182 }
c8416c26
BF
1183 else
1184 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1185 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1186 }
257dc59d
FC
1187 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1188 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1189 return NULL;
dc848c6f
PP
1190 cv = GvCV(gv);
1191
adb5a9ae 1192 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1193 return NULL;
ed850460 1194
dc848c6f
PP
1195 /*
1196 * Inheriting AUTOLOAD for non-methods works ... for now.
1197 */
0eeb01b9
FC
1198 if (
1199 !(flags & GV_AUTOLOAD_ISMETHOD)
1200 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1201 )
d1d15184 1202 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC
1203 "Use of inherited AUTOLOAD for non-method %"SVf
1204 "::%"UTF8f"() is deprecated",
ecad31f0 1205 SVfARG(packname),
b17a0679 1206 UTF8fARG(is_utf8, len, name));
44a8e56a 1207
aed2304a 1208 if (CvISXSUB(cv)) {
bb619f37
FC
1209 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1210 * and split that value on the last '::', pass along the same data
1211 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC
1212 *
1213 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1214 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC
1215 * type. Since SvPVX has been documented as returning the sub name
1216 * for a long time, but not as returning the prototype, we have
1217 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1218 * elsewhere.
1219 *
1220 * We put the prototype in the same allocated buffer, but after
1221 * the sub name. The SvPOK flag indicates the presence of a proto-
1222 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1223 * If both flags are on, then SvLEN is used to indicate the end of
1224 * the prototype (artificially lower than what is actually allo-
1225 * cated), at the risk of having to reallocate a few bytes unneces-
1226 * sarily--but that should happen very rarely, if ever.
1227 *
1228 * We use SvUTF8 for both prototypes and sub names, so if one is
1229 * UTF8, the other must be upgraded.
adb5a9ae 1230 */
c68d9564 1231 CvSTASH_set(cv, stash);
8fa6a409 1232 if (SvPOK(cv)) { /* Ouch! */
e7881358 1233 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC
1234 STRLEN ulen;
1235 const char *proto = CvPROTO(cv);
1236 assert(proto);
1237 if (SvUTF8(cv))
1238 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1239 ulen = SvCUR(tmpsv);
1240 SvCUR(tmpsv)++; /* include null in string */
1241 sv_catpvn_flags(
1242 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1243 );
1244 SvTEMP_on(tmpsv); /* Allow theft */
1245 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1246 SvTEMP_off(tmpsv);
e7881358 1247 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC
1248 SvLEN(cv) = SvCUR(cv) + 1;
1249 SvCUR(cv) = ulen;
1250 }
1251 else {
1252 sv_setpvn((SV *)cv, name, len);
1253 SvPOK_off(cv);
1254 if (is_utf8)
c8416c26 1255 SvUTF8_on(cv);
8fa6a409
FC
1256 else SvUTF8_off(cv);
1257 }
1258 CvAUTOLOAD_on(cv);
adb5a9ae 1259 }
adb5a9ae 1260
44a8e56a
PP
1261 /*
1262 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1263 * The subroutine's original name may not be "AUTOLOAD", so we don't
1264 * use that, but for lack of anything better we will use the sub's
1265 * original package to look up $AUTOLOAD.
1266 */
18691622 1267 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1268 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1269 ENTER;
1270
c69033f2 1271 if (!isGV(vargv)) {
04ec7e59 1272 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1273#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1274 GvSV(vargv) = newSV(0);
c69033f2
NC
1275#endif
1276 }
3d35f11b 1277 LEAVE;
e203899d 1278 varsv = GvSVn(vargv);
4bac9ae4
CS
1279 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1280 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1281 sv_setsv(varsv, packname);
396482e1 1282 sv_catpvs(varsv, "::");
d40bf27b
NC
1283 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1284 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC
1285 sv_catpvn_flags(
1286 varsv, name, len,
5bcd1ef4 1287 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1288 );
c8416c26
BF
1289 if (is_utf8)
1290 SvUTF8_on(varsv);
a0d0e21e
LW
1291 return gv;
1292}
1293
44a2ac75
YO
1294
1295/* require_tie_mod() internal routine for requiring a module
486ec47a 1296 * that implements the logic of automatic ties like %! and %-
e94ea821
FC
1297 * It loads the module and then calls the _tie_it subroutine
1298 * with the passed gv as an argument.
44a2ac75
YO
1299 *
1300 * The "gv" parameter should be the glob.
45cbc99a
RGS
1301 * "varpv" holds the name of the var, used for error messages.
1302 * "namesv" holds the module name. Its refcount will be decremented.
45cbc99a 1303 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1304 * For the protection of $! to work (it is set by this routine)
1305 * the sv slot must already be magicalized.
d2c93421 1306 */
e94ea821
FC
1307STATIC void
1308S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const U32 flags)
d2c93421 1309{
e94ea821
FC
1310 const char varname = *varpv; /* varpv might be clobbered by
1311 load_module, so save it. For the
1312 moment it’s always a single char. */
1313 const SV * const target = varname == '[' ? GvSV(gv) : (SV *)GvHV(gv);
45cbc99a 1314
7918f24d
NC
1315 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1316
e94ea821
FC
1317 /* If it is not tied */
1318 if (!target || !SvRMAGICAL(target)
1319 || !mg_find(target,
1320 varname == '[' ? PERL_MAGIC_tiedscalar : PERL_MAGIC_tied))
1321 {
1322 HV *stash;
1323 GV **gvp;
1324 dSP;
1325
1326 ENTER;
1327 SAVEFREESV(namesv);
1328
1329#define HV_FETCH_TIE_FUNC (GV **)hv_fetch(stash, "_tie_it", 7, 0)
1330
1331 /* Load the module if it is not loaded. */
1332 if (!(stash = gv_stashsv(namesv, 0))
1333 || !(gvp = HV_FETCH_TIE_FUNC) || !*gvp || !GvCV(*gvp))
1334 {
45cbc99a 1335 SV *module = newSVsv(namesv);
b82b06b8 1336 const char type = varname == '[' ? '$' : '%';
44a2ac75 1337 if ( flags & 1 )
45cbc99a
RGS
1338 save_scalar(gv);
1339 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1340 assert(sp == PL_stack_sp);
da51bb9b 1341 stash = gv_stashsv(namesv, 0);
44a2ac75 1342 if (!stash)
b82b06b8
FC
1343 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1344 type, varname, SVfARG(namesv));
e94ea821
FC
1345 else if (!(gvp = HV_FETCH_TIE_FUNC) || !*gvp || !GvCV(*gvp))
1346 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not define _tie_it",
1347 type, varname, SVfARG(namesv));
1348 }
1349 /* Now call the tie function. It should be in *gvp. */
1350 assert(gvp); assert(*gvp); assert(GvCV(*gvp));
1351 PUSHMARK(SP);
1352 XPUSHs((SV *)gv);
1353 PUTBACK;
1354 call_sv((SV *)*gvp, G_VOID|G_DISCARD);
1355 LEAVE;
d2c93421 1356 }
e7881358 1357 else SvREFCNT_dec_NN(namesv);
d2c93421
RH
1358}
1359
954c1994
GS
1360/*
1361=for apidoc gv_stashpv
1362
da51bb9b 1363Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1364determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1365
1366=cut
1367*/
1368
a0d0e21e 1369HV*
864dbfa3 1370Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1371{
7918f24d 1372 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1373 return gv_stashpvn(name, strlen(name), create);
1374}
1375
bc96cb06
SH
1376/*
1377=for apidoc gv_stashpvn
1378
da51bb9b
NC
1379Returns a pointer to the stash for a specified package. The C<namelen>
1380parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1381to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1382created if it does not already exist. If the package does not exist and
796b6530 1383C<flags> is 0 (or any other setting that does not create packages) then C<NULL>
da51bb9b
NC
1384is returned.
1385
566a4718
YO
1386Flags may be one of:
1387
1388 GV_ADD
1389 SVf_UTF8
1390 GV_NOADD_NOINIT
1391 GV_NOINIT
1392 GV_NOEXPAND
1393 GV_ADDMG
1394
796b6530 1395The most important of which are probably C<GV_ADD> and C<SVf_UTF8>.
bc96cb06 1396
808724c8 1397Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1398recommended for performance reasons.
1399
bc96cb06
SH
1400=cut
1401*/
1402
0eadbdad
YO
1403/*
1404gv_stashpvn_internal
1405
1406Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1407as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1408
1409*/
1410
4e7ebec5 1411PERL_STATIC_INLINE HV*
0eadbdad 1412S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1413{
0cea0058 1414 char smallbuf[128];
46fc3d4c 1415 char *tmpbuf;
a0d0e21e
LW
1416 HV *stash;
1417 GV *tmpgv;
add0ecde 1418 U32 tmplen = namelen + 2;
dc437b57 1419
0eadbdad 1420 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1421
add0ecde 1422 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1423 tmpbuf = smallbuf;
1424 else
add0ecde
VP
1425 Newx(tmpbuf, tmplen, char);
1426 Copy(name, tmpbuf, namelen, char);
1427 tmpbuf[namelen] = ':';
1428 tmpbuf[namelen+1] = ':';
1429 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1430 if (tmpbuf != smallbuf)
1431 Safefree(tmpbuf);
d2fcb1d6 1432 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1433 return NULL;
a0d0e21e 1434 stash = GvHV(tmpgv);
1f656fcf 1435 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1436 assert(stash);
1f656fcf 1437 if (!HvNAME_get(stash)) {
0be4d16f 1438 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1439
1440 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1441 /* If the containing stash has multiple effective
1442 names, see that this one gets them, too. */
1443 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1444 mro_package_moved(stash, NULL, tmpgv, 1);
1445 }
a0d0e21e 1446 return stash;
463ee0b2
LW
1447}
1448
808724c8 1449/*
1450gv_stashsvpvn_cached
1451
1452Returns a pointer to the stash for a specified package, possibly
1453cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1454
1455Requires one of either namesv or namepv to be non-null.
1456
fbe13c60 1457See C<L</gv_stashpvn>> for details on "flags".
808724c8 1458
1459Note the sv interface is strongly preferred for performance reasons.
1460
1461*/
1462
1463#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1464 assert(namesv || name)
1465
1466PERL_STATIC_INLINE HV*
1467S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1468{
1469 HV* stash;
808724c8 1470 HE* he;
1471
1472 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1473
1474 he = (HE *)hv_common(
1475 PL_stashcache, namesv, name, namelen,
4e7ebec5 1476 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1477 );
808724c8 1478
4e7ebec5 1479 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1480 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1481
808724c8 1482 if (namesv) {
1483 if (SvOK(namesv)) { /* prevent double uninit warning */
1484 STRLEN len;
1485 name = SvPV_const(namesv, len);
1486 namelen = len;
1487 flags |= SvUTF8(namesv);
1488 } else {
1489 name = ""; namelen = 0;
1490 }
1491 }
0eadbdad
YO
1492 stash = gv_stashpvn_internal(name, namelen, flags);
1493
4e7ebec5 1494 if (stash && namelen) {
1495 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1496 (void)hv_store(PL_stashcache, name,
4e7ebec5 1497 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1498 }
808724c8 1499
4e7ebec5 1500 return stash;
1501}
1502
808724c8 1503HV*
1504Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1505{
1506 PERL_ARGS_ASSERT_GV_STASHPVN;
1507 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1508}
1509
954c1994
GS
1510/*
1511=for apidoc gv_stashsv
1512
fbe13c60
KW
1513Returns a pointer to the stash for a specified package. See
1514C<L</gv_stashpvn>>.
954c1994 1515
fbe13c60
KW
1516Note this interface is strongly preferred over C<gv_stashpvn> for performance
1517reasons.
808724c8 1518
954c1994
GS
1519=cut
1520*/
1521
a0d0e21e 1522HV*
da51bb9b 1523Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1524{
7918f24d 1525 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1526 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW
1527}
1528
1529
463ee0b2 1530GV *
fe9845cc 1531Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1532 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1533 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1534}
1535
1536GV *
fe9845cc 1537Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1538 STRLEN len;
77cb3b01
FC
1539 const char * const nambeg =
1540 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1541 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1542 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1543}
1544
90aeefb4 1545PERL_STATIC_INLINE void
290a1700 1546S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1547{
1548 AV* av;
1549
1550 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1551
1552 av = GvAVn(gv);
1553 GvMULTI_on(gv);
1554 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1555 NULL, 0);
ad7cce9f
FR
1556}
1557
90aeefb4
BF
1558/* This function grabs name and tries to split a stash and glob
1559 * from its contents. TODO better description, comments
1560 *
1561 * If the function returns TRUE and 'name == name_end', then
1562 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1563 */
1564PERL_STATIC_INLINE bool
1565S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1566 STRLEN *len, const char *nambeg, STRLEN full_len,
1567 const U32 is_utf8, const I32 add)
1568{
1569 const char *name_cursor;
1570 const char *const name_end = nambeg + full_len;
1571 const char *const name_em1 = name_end - 1;
1572
1573 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1574
1575 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1576 /* accidental stringify on a GV? */
1577 (*name)++;
1578 }
1579
1580 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1581 if (name_cursor < name_em1 &&
1582 ((*name_cursor == ':' && name_cursor[1] == ':')
1583 || *name_cursor == '\''))
1584 {
1585 if (!*stash)
1586 *stash = PL_defstash;
1587 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1588 return FALSE;
1589
1590 *len = name_cursor - *name;
1591 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1592 const char *key;
1593 GV**gvp;
1594 if (*name_cursor == ':') {
1595 key = *name;
1596 *len += 2;
1597 }
1598 else {
1599 char *tmpbuf;
1600 Newx(tmpbuf, *len+2, char);
1601 Copy(*name, tmpbuf, *len, char);
1602 tmpbuf[(*len)++] = ':';
1603 tmpbuf[(*len)++] = ':';
1604 key = tmpbuf;
1605 }
c161da64 1606 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF
1607 *gv = gvp ? *gvp : NULL;
1608 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1609 if (SvTYPE(*gv) != SVt_PVGV)
1610 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1611 else
1612 GvMULTI_on(*gv);
1613 }
1614 if (key != *name)
1615 Safefree(key);
1616 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1617 return FALSE;
1618
1619 if (!(*stash = GvHV(*gv))) {
1620 *stash = GvHV(*gv) = newHV();
1621 if (!HvNAME_get(*stash)) {
1622 if (GvSTASH(*gv) == PL_defstash && *len == 6
1623 && strnEQ(*name, "CORE", 4))
1624 hv_name_set(*stash, "CORE", 4, 0);
1625 else
1626 hv_name_set(
1627 *stash, nambeg, name_cursor-nambeg, is_utf8
1628 );
1629 /* If the containing stash has multiple effective
1630 names, see that this one gets them, too. */
1631 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1632 mro_package_moved(*stash, NULL, *gv, 1);
1633 }
1634 }
1635 else if (!HvNAME_get(*stash))
1636 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1637 }
1638
1639 if (*name_cursor == ':')
1640 name_cursor++;
1641 *name = name_cursor+1;
1642 if (*name == name_end) {
1643 if (!*gv)
1644 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1645 return TRUE;
1646 }
1647 }
1648 }
1649 *len = name_cursor - *name;
1650 return TRUE;
1651}
1652
536d1a88 1653/* Checks if an unqualified name is in the main stash */
90aeefb4 1654PERL_STATIC_INLINE bool
536d1a88 1655S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1656{
536d1a88 1657 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1658
90aeefb4 1659 /* If it's an alphanumeric variable */
536d1a88 1660 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF
1661 /* Some "normal" variables are always in main::,
1662 * like INC or STDOUT.
1663 */
1664 switch (len) {
1665 case 1:
1666 if (*name == '_')
536d1a88 1667 return TRUE;
90aeefb4
BF
1668 break;
1669 case 3:
1670 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1671 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1672 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1673 return TRUE;
90aeefb4
BF
1674 break;
1675 case 4:
1676 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1677 && name[3] == 'V')
536d1a88 1678 return TRUE;
90aeefb4
BF
1679 break;
1680 case 5:
1681 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1682 && name[3] == 'I' && name[4] == 'N')
536d1a88 1683 return TRUE;
90aeefb4
BF
1684 break;
1685 case 6:
1686 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1687 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1688 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1689 return TRUE;
90aeefb4
BF
1690 break;
1691 case 7:
1692 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1693 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1694 && name[6] == 'T')
536d1a88 1695 return TRUE;
90aeefb4
BF
1696 break;
1697 }
536d1a88
BF
1698 }
1699 /* *{""}, or a special variable like $@ */
1700 else
1701 return TRUE;
1702
1703 return FALSE;
1704}
1705
1706
1707/* This function is called if parse_gv_stash_name() failed to
1708 * find a stash, or if GV_NOTQUAL or an empty name was passed
1709 * to gv_fetchpvn_flags.
1710 *
1711 * It returns FALSE if the default stash can't be found nor created,
1712 * which might happen during global destruction.
1713 */
1714PERL_STATIC_INLINE bool
1715S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1716 const U32 is_utf8, const I32 add,
1717 const svtype sv_type)
1718{
1719 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1720
1721 /* No stash in name, so see how we can default */
90aeefb4 1722
536d1a88
BF
1723 if ( gv_is_in_main(name, len, is_utf8) ) {
1724 *stash = PL_defstash;
1725 }
1726 else {
1727 if (IN_PERL_COMPILETIME) {
90aeefb4
BF
1728 *stash = PL_curstash;
1729 if (add && (PL_hints & HINT_STRICT_VARS) &&
1730 sv_type != SVt_PVCV &&
1731 sv_type != SVt_PVGV &&
1732 sv_type != SVt_PVFM &&
1733 sv_type != SVt_PVIO &&
1734 !(len == 1 && sv_type == SVt_PV &&
1735 (*name == 'a' || *name == 'b')) )
1736 {
c161da64 1737 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF
1738 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1739 SvTYPE(*gvp) != SVt_PVGV)
1740 {
1741 *stash = NULL;
1742 }
1743 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1744 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1745 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1746 {
1747 /* diag_listed_as: Variable "%s" is not imported%s */
1748 Perl_ck_warner_d(
1749 aTHX_ packWARN(WARN_MISC),
1750 "Variable \"%c%"UTF8f"\" is not imported",
1751 sv_type == SVt_PVAV ? '@' :
1752 sv_type == SVt_PVHV ? '%' : '$',
1753 UTF8fARG(is_utf8, len, name));
1754 if (GvCVu(*gvp))
1755 Perl_ck_warner_d(
1756 aTHX_ packWARN(WARN_MISC),
1757 "\t(Did you mean &%"UTF8f" instead?)\n",
1758 UTF8fARG(is_utf8, len, name)
1759 );
1760 *stash = NULL;
1761 }
1762 }
1763 }
1764 else {
1765 /* Use the current op's stash */
1766 *stash = CopSTASH(PL_curcop);
1767 }
1768 }
90aeefb4
BF
1769
1770 if (!*stash) {
1771 if (add && !PL_in_clean_all) {
10860bf4
FC
1772 GV *gv;
1773 qerror(Perl_mess(aTHX_
90aeefb4 1774 "Global symbol \"%s%"UTF8f
d8c6310a
FC
1775 "\" requires explicit package name (did you forget to "
1776 "declare \"my %s%"UTF8f"\"?)",
1777 (sv_type == SVt_PV ? "$"
1778 : sv_type == SVt_PVAV ? "@"
1779 : sv_type == SVt_PVHV ? "%"
1780 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF
1781 (sv_type == SVt_PV ? "$"
1782 : sv_type == SVt_PVAV ? "@"
1783 : sv_type == SVt_PVHV ? "%"
10860bf4 1784 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF
1785 /* To maintain the output of errors after the strict exception
1786 * above, and to keep compat with older releases, rather than
1787 * placing the variables in the pad, we place
1788 * them in the <none>:: stash.
1789 */
90aeefb4
BF
1790 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1791 if (!gv) {
1792 /* symbol table under destruction */
1793 return FALSE;
1794 }
1795 *stash = GvHV(gv);
1796 }
1797 else
1798 return FALSE;
1799 }
1800
1801 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1802 return FALSE;
1803
1804 return TRUE;
1805}
1806
8c995aba
FC
1807/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1808 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1809 this file. */
1810#undef SvREADONLY_on
1811#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1812
930867a8
BF
1813/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1814 * a new GV.
1815 * Note that it does not insert the GV into the stash prior to
1816 * magicalization, which some variables require need in order
1817 * to work (like $[, %+, %-, %!), so callers must take care of
1818 * that beforehand.
1819 *
1820 * The return value has a specific meaning for gv_fetchpvn_flags:
1821 * If it returns true, and the gv is empty, it indicates that its
1822 * refcount should be decreased.
1823 */
1824PERL_STATIC_INLINE bool
1825S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1826 bool addmg, const svtype sv_type)
79072805 1827{
960b831f 1828 SSize_t paren;
79072805 1829
930867a8 1830 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1831
44428a46 1832 if (stash != PL_defstash) { /* not the main stash */
ea238638 1833 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC
1834 and VERSION. All the others apply only to the main stash or to
1835 CORE (which is checked right after this). */
ea238638 1836 if (len) {
b464bac0 1837 const char * const name2 = name + 1;
cc4c2da6 1838 switch (*name) {
cc4c2da6
NC
1839 case 'E':
1840 if (strnEQ(name2, "XPORT", 5))
1841 GvMULTI_on(gv);
1842 break;
1843 case 'I':
44428a46 1844 if (strEQ(name2, "SA"))
290a1700 1845 gv_magicalize_isa(gv);
cc4c2da6 1846 break;
44428a46
FC
1847 case 'V':
1848 if (strEQ(name2, "ERSION"))
1849 GvMULTI_on(gv);
1850 break;
ea238638 1851 case 'a':
7bb33634
FC
1852 if (stash == PL_debstash && len==4 && strEQ(name2,"rgs")) {
1853 GvMULTI_on(gv_AVadd(gv));
1854 break;
1855 }
ea238638
FC
1856 case 'b':
1857 if (len == 1 && sv_type == SVt_PV)
1858 GvMULTI_on(gv);
924ba076 1859 /* FALLTHROUGH */
4aaa4757
FC
1860 default:
1861 goto try_core;
1862 }
930867a8 1863 return addmg;
4aaa4757
FC
1864 }
1865 try_core:
1866 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1867 /* Avoid null warning: */
1868 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC
1869 if (strnEQ(stashname, "CORE", 4))
1870 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC
1871 }
1872 }
1873 else if (len > 1) {
1874#ifndef EBCDIC
1875 if (*name > 'V' ) {
1876 NOOP;
1877 /* Nothing else to do.
1878 The compiler will probably turn the switch statement into a
1879 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW
1880 the common case of lower case variable names. (On EBCDIC
1881 platforms, we can't just do:
1882 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1883 because cases like '\027' in the switch statement below are
1884 C1 (non-ASCII) controls on those platforms, so the remapping
1885 would make them larger than 'V')
1886 */
44428a46
FC
1887 } else
1888#endif
1889 {
3e669301 1890 const char * name2 = name + 1;
44428a46
FC
1891 switch (*name) {
1892 case 'A':
1893 if (strEQ(name2, "RGV")) {
1894 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1895 }
1896 else if (strEQ(name2, "RGVOUT")) {
1897 GvMULTI_on(gv);
1898 }
1899 break;
1900 case 'E':
1901 if (strnEQ(name2, "XPORT", 5))
1902 GvMULTI_on(gv);
1903 break;
1904 case 'I':
1905 if (strEQ(name2, "SA")) {
290a1700 1906 gv_magicalize_isa(gv);
44428a46
FC
1907 }
1908 break;
cc4c2da6
NC
1909 case 'S':
1910 if (strEQ(name2, "IG")) {
1911 HV *hv;
1912 I32 i;
d525a7b2
NC
1913 if (!PL_psig_name) {
1914 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1915 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1916 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1917 } else {
1918 /* I think that the only way to get here is to re-use an
1919 embedded perl interpreter, where the previous
1920 use didn't clean up fully because
1921 PL_perl_destruct_level was 0. I'm not sure that we
1922 "support" that, in that I suspect in that scenario
1923 there are sufficient other garbage values left in the
1924 interpreter structure that something else will crash
1925 before we get here. I suspect that this is one of
1926 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1927 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1928 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
1929 }
1930 GvMULTI_on(gv);
1931 hv = GvHVn(gv);
a0714e2c 1932 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1933 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1934 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
1935 if (init)
1936 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
1937 }
1938 }
1939 break;
1940 case 'V':
1941 if (strEQ(name2, "ERSION"))
1942 GvMULTI_on(gv);
1943 break;
e5218da5
GA
1944 case '\003': /* $^CHILD_ERROR_NATIVE */
1945 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1946 goto magicalize;
1947 break;
cc4c2da6
NC
1948 case '\005': /* $^ENCODING */
1949 if (strEQ(name2, "NCODING"))
1950 goto magicalize;
1951 break;
9ebf26ad
FR
1952 case '\007': /* $^GLOBAL_PHASE */
1953 if (strEQ(name2, "LOBAL_PHASE"))
1954 goto ro_magicalize;
1955 break;
8561ea1d
FC
1956 case '\014': /* $^LAST_FH */
1957 if (strEQ(name2, "AST_FH"))
1958 goto ro_magicalize;
1959 break;
cde0cee5 1960 case '\015': /* $^MATCH */
960b831f
NC
1961 if (strEQ(name2, "ATCH")) {
1962 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1963 goto storeparen;
1964 }
66230c86 1965 break;
cc4c2da6
NC
1966 case '\017': /* $^OPEN */
1967 if (strEQ(name2, "PEN"))
1968 goto magicalize;
1969 break;
cde0cee5 1970 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC
1971 if (strEQ(name2, "REMATCH")) {
1972 paren = RX_BUFF_IDX_CARET_PREMATCH;
1973 goto storeparen;
1974 }
1975 if (strEQ(name2, "OSTMATCH")) {
1976 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1977 goto storeparen;
1978 }
9ebf26ad 1979 break;
cc4c2da6
NC
1980 case '\024': /* ${^TAINT} */
1981 if (strEQ(name2, "AINT"))
1982 goto ro_magicalize;
1983 break;
7cebcbc0 1984 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1985 if (strEQ(name2, "NICODE"))
cc4c2da6 1986 goto ro_magicalize;
a0288114 1987 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1988 goto ro_magicalize;
e07ea26a
NC
1989 if (strEQ(name2, "TF8CACHE"))
1990 goto magicalize;
cc4c2da6
NC
1991 break;
1992 case '\027': /* $^WARNING_BITS */
1993 if (strEQ(name2, "ARNING_BITS"))
1994 goto magicalize;
8ca2a5d6
DD
1995#ifdef WIN32
1996 else if (strEQ(name2, "IN32_SLOPPY_STAT"))
1997 goto magicalize;
1998#endif
cc4c2da6
NC
1999 break;
2000 case '1':
2001 case '2':
2002 case '3':
2003 case '4':
2004 case '5':
2005 case '6':
2006 case '7':
2007 case '8':
2008 case '9':
85e6fe83 2009 {
2fdbfb4d
AB
2010 /* Ensures that we have an all-digit variable, ${"1foo"} fails
2011 this test */
22ff3130
HS
2012 UV uv;
2013 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
2014 return addmg;
2015 /* XXX why are we using a SSize_t? */
2016 paren = (SSize_t)(I32)uv;
960b831f 2017 goto storeparen;
1d7c1841 2018 }
dc437b57 2019 }
93a17b20 2020 }
392db708
NC
2021 } else {
2022 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2023 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2024 switch (*name) {
6361f656 2025 case '&': /* $& */
960b831f
NC
2026 paren = RX_BUFF_IDX_FULLMATCH;
2027 goto sawampersand;
6361f656 2028 case '`': /* $` */
960b831f
NC
2029 paren = RX_BUFF_IDX_PREMATCH;
2030 goto sawampersand;
6361f656 2031 case '\'': /* $' */
960b831f
NC
2032 paren = RX_BUFF_IDX_POSTMATCH;
2033 sawampersand:
1a904fc8 2034#ifdef PERL_SAWAMPERSAND
a289ef89 2035 if (!(
cc4c2da6
NC
2036 sv_type == SVt_PVAV ||
2037 sv_type == SVt_PVHV ||
2038 sv_type == SVt_PVCV ||
2039 sv_type == SVt_PVFM ||
2040 sv_type == SVt_PVIO
d3b97530
DM
2041 )) { PL_sawampersand |=
2042 (*name == '`')
2043 ? SAWAMPERSAND_LEFT
2044 : (*name == '&')
2045 ? SAWAMPERSAND_MIDDLE
2046 : SAWAMPERSAND_RIGHT;
2047 }
1a904fc8 2048#endif
960b831f 2049 goto storeparen;
e91d8259
NC
2050 case '1': /* $1 */
2051 case '2': /* $2 */
2052 case '3': /* $3 */
2053 case '4': /* $4 */
2054 case '5': /* $5 */
2055 case '6': /* $6 */
2056 case '7': /* $7 */
2057 case '8': /* $8 */
2058 case '9': /* $9 */
960b831f
NC
2059 paren = *name - '0';
2060
2061 storeparen:
e91d8259
NC
2062 /* Flag the capture variables with a NULL mg_ptr
2063 Use mg_len for the array index to lookup. */
960b831f 2064 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2065 break;
cc4c2da6 2066
6361f656 2067 case ':': /* $: */
c69033f2 2068 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
2069 goto magicalize;
2070
6361f656 2071 case '?': /* $? */
ff0cee69 2072#ifdef COMPLEX_STATUS
c69033f2 2073 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2074#endif
cc4c2da6 2075 goto magicalize;
ff0cee69 2076
6361f656 2077 case '!': /* $! */
67261566 2078 GvMULTI_on(gv);
44a2ac75 2079 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2080
ad64d0ec 2081 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2082
44a2ac75 2083 /* magicalization must be done before require_tie_mod is called */
67261566 2084 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
e94ea821 2085 require_tie_mod(gv, "!", newSVpvs("Errno"), 1);
d2c93421 2086
6cef1e77 2087 break;
6361f656
AB
2088 case '-': /* $- */
2089 case '+': /* $+ */
44a2ac75
YO
2090 GvMULTI_on(gv); /* no used once warnings here */
2091 {
44a2ac75 2092 AV* const av = GvAVn(gv);
ad64d0ec 2093 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2094
ad64d0ec
NC
2095 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2096 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2097 if (avc)
44a2ac75 2098 SvREADONLY_on(GvSVn(gv));
44a2ac75 2099 SvREADONLY_on(av);
67261566
YO
2100
2101 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
e94ea821 2102 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), 0);
67261566 2103
80305961 2104 break;
cc4c2da6 2105 }
6361f656
AB
2106 case '*': /* $* */
2107 case '#': /* $# */
9b387841 2108 if (sv_type == SVt_PV)
4f650b80 2109 /* diag_listed_as: $* is no longer supported */
9b387841 2110 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2111 "$%c is no longer supported", *name);
8ae1fe26 2112 break;
b3ca2e83
NC
2113 case '\010': /* $^H */
2114 {
2115 HV *const hv = GvHVn(gv);
2116 hv_magic(hv, NULL, PERL_MAGIC_hints);
2117 }
2118 goto magicalize;
b82b06b8 2119 case '[': /* $[ */
7d69d4a6 2120 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2121 && FEATURE_ARYBASE_IS_ENABLED) {
e94ea821 2122 require_tie_mod(gv,name,newSVpvs("arybase"),0);
b82b06b8 2123 }
7d69d4a6 2124 else goto magicalize;
b82b06b8 2125 break;
cc4c2da6 2126 case '\023': /* $^S */
2fdbfb4d
AB
2127 ro_magicalize:
2128 SvREADONLY_on(GvSVn(gv));
924ba076 2129 /* FALLTHROUGH */
6361f656 2130 case '0': /* $0 */
6361f656
AB
2131 case '^': /* $^ */
2132 case '~': /* $~ */
2133 case '=': /* $= */
2134 case '%': /* $% */
2135 case '.': /* $. */
2136 case '(': /* $( */
2137 case ')': /* $) */
2138 case '<': /* $< */
2139 case '>': /* $> */
2140 case '\\': /* $\ */
2141 case '/': /* $/ */
4505a31f 2142 case '|': /* $| */
9cdac2a2 2143 case '$': /* $$ */
cc4c2da6
NC
2144 case '\001': /* $^A */
2145 case '\003': /* $^C */
2146 case '\004': /* $^D */
2147 case '\005': /* $^E */
2148 case '\006': /* $^F */
cc4c2da6
NC
2149 case '\011': /* $^I, NOT \t in EBCDIC */
2150 case '\016': /* $^N */
2151 case '\017': /* $^O */
2152 case '\020': /* $^P */
2153 case '\024': /* $^T */
2154 case '\027': /* $^W */
2155 magicalize:
ad64d0ec 2156 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2157 break;
e521374c 2158
cc4c2da6 2159 case '\014': /* $^L */
76f68e9b 2160 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2161 break;
6361f656 2162 case ';': /* $; */
76f68e9b 2163 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2164 break;
6361f656 2165 case ']': /* $] */
cc4c2da6 2166 {
3638bf15 2167 SV * const sv = GvSV(gv);
d7aa5382 2168 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2169 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
2170 GvSV(gv) = vnumify(PL_patchlevel);
2171 SvREADONLY_on(GvSV(gv));
2172 SvREFCNT_dec(sv);
93a17b20
LW
2173 }
2174 break;
cc4c2da6
NC
2175 case '\026': /* $^V */
2176 {
3638bf15 2177 SV * const sv = GvSV(gv);
f9be5ac8
DM
2178 GvSV(gv) = new_version(PL_patchlevel);
2179 SvREADONLY_on(GvSV(gv));
2180 SvREFCNT_dec(sv);
16070b82
GS
2181 }
2182 break;
ea238638
FC
2183 case 'a':
2184 case 'b':
dc3e91f6 2185 if (sv_type == SVt_PV)
ea238638 2186 GvMULTI_on(gv);
cc4c2da6 2187 }
79072805 2188 }
930867a8
BF
2189
2190 return addmg;
71c35c05
BF
2191}
2192
8c995aba
FC
2193/* If we do ever start using this later on in the file, we need to make
2194 sure we don’t accidentally use the wrong definition. */
2195#undef SvREADONLY_on
2196
070dc475
BF
2197/* This function is called when the stash already holds the GV of the magic
2198 * variable we're looking for, but we need to check that it has the correct
2199 * kind of magic. For example, if someone first uses $! and then %!, the
2200 * latter would end up here, and we add the Errno tie to the HASH slot of
2201 * the *! glob.
2202 */
2203PERL_STATIC_INLINE void
2204S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2205{
2206 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2207
2208 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2209 if (*name == '!')
e94ea821 2210 require_tie_mod(gv, "!", newSVpvs("Errno"), 1);
070dc475 2211 else if (*name == '-' || *name == '+')
e94ea821 2212 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), 0);
070dc475
BF
2213 } else if (sv_type == SVt_PV) {
2214 if (*name == '*' || *name == '#') {
2215 /* diag_listed_as: $* is no longer supported */
2216 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2217 WARN_SYNTAX),
2218 "$%c is no longer supported", *name);
2219 }
2220 }
2221 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2222 switch (*name) {
2223 case '[':
e94ea821 2224 require_tie_mod(gv,name,newSVpvs("arybase"),0);
070dc475
BF
2225 break;
2226#ifdef PERL_SAWAMPERSAND
2227 case '`':
2228 PL_sawampersand |= SAWAMPERSAND_LEFT;
2229 (void)GvSVn(gv);
2230 break;
2231 case '&':
2232 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2233 (void)GvSVn(gv);
2234 break;
2235 case '\'':
2236 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2237 (void)GvSVn(gv);
2238 break;
2239#endif
2240 }
2241 }
2242}
2243
71c35c05
BF
2244GV *
2245Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2246 const svtype sv_type)
2247{
71c35c05
BF
2248 const char *name = nambeg;
2249 GV *gv = NULL;
2250 GV**gvp;
2251 STRLEN len;
2252 HV *stash = NULL;
2253 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2254 const I32 no_expand = flags & GV_NOEXPAND;
2255 const I32 add = flags & ~GV_NOADD_MASK;
2256 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2257 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF
2258 const char *const name_end = nambeg + full_len;
2259 U32 faking_it;
2260
2261 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2262
2263 /* If we have GV_NOTQUAL, the caller promised that
2264 * there is no stash, so we can skip the check.
2265 * Similarly if full_len is 0, since then we're
2266 * dealing with something like *{""} or ""->foo()
2267 */
2268 if ((flags & GV_NOTQUAL) || !full_len) {
2269 len = full_len;
2270 }
2271 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2272 if (name == name_end) return gv;
2273 }
2274 else {
2275 return NULL;
2276 }
2277
2278 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2279 return NULL;
2280 }
2281
2282 /* By this point we should have a stash and a name */
c161da64 2283 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF
2284 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2285 if (addmg) gv = (GV *)newSV(0);
2286 else return NULL;
2287 }
2288 else gv = *gvp, addmg = 0;
2289 /* From this point on, addmg means gv has not been inserted in the
2290 symtab yet. */
2291
2292 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF
2293 /* The GV already exists, so return it, but check if we need to do
2294 * anything else with it before that.
2295 */
71c35c05 2296 if (add) {
c002ae9a
BF
2297 /* This is the heuristic that handles if a variable triggers the
2298 * 'used only once' warning. If there's already a GV in the stash
2299 * with this name, then we assume that the variable has been used
2300 * before and turn its MULTI flag on.
2301 * It's a heuristic because it can easily be "tricked", like with
2302 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2303 * not warning about $main::foo being used just once
2304 */
71c35c05
BF
2305 GvMULTI_on(gv);
2306 gv_init_svtype(gv, sv_type);
2307 /* You reach this path once the typeglob has already been created,
2308 either by the same or a different sigil. If this path didn't
2309 exist, then (say) referencing $! first, and %! second would
2310 mean that %! was not handled correctly. */
2311 if (len == 1 && stash == PL_defstash) {
070dc475 2312 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF
2313 }
2314 else if (len == 3 && sv_type == SVt_PVAV
2315 && strnEQ(name, "ISA", 3)
2316 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2317 gv_magicalize_isa(gv);
2318 }
2319 return gv;
2320 } else if (no_init) {
2321 assert(!addmg);
2322 return gv;
c002ae9a
BF
2323 }
2324 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2325 * don't expand it to a glob. This is an optimization so that things
2326 * copying constants over, like Exporter, don't have to be rewritten
2327 * to take into account that you can store more than just globs in
2328 * stashes.
2329 */
2330 else if (no_expand && SvROK(gv)) {
71c35c05
BF
2331 assert(!addmg);
2332 return gv;
2333 }
2334
2335 /* Adding a new symbol.
2336 Unless of course there was already something non-GV here, in which case
2337 we want to behave as if there was always a GV here, containing some sort
2338 of subroutine.
2339 Otherwise we run the risk of creating things like GvIO, which can cause
2340 subtle bugs. eg the one that tripped up SQL::Translator */
2341
2342 faking_it = SvOK(gv);
2343
2344 if (add & GV_ADDWARN)
2345 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2346 "Had to create %"UTF8f" unexpectedly",
2347 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2348 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2349
9e5de6ae 2350 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF
2351 GvMULTI_on(gv) ;
2352
930867a8
BF
2353#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2354 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2355
71c35c05 2356 /* set up magic where warranted */
930867a8
BF
2357 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2358 /* See 23496c6 */
2359 if (GvEMPTY(gv)) {
2360 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2361 /* The GV was and still is "empty", except that now
2362 * it has the magic flags turned on, so we want it
2363 * stored in the symtab.
2364 */
2365 (void)hv_store(stash,name,len,(SV *)gv,0);
2366 }
2367 else {
2368 /* Most likely the temporary GV created above */
2369 SvREFCNT_dec_NN(gv);
2370 gv = NULL;
2371 }
2372 }
e94ea821
FC
2373 else
2374 /* Not empty; this means gv_magicalize magicalised it. */
2375 (void)hv_store(stash,name,len,(SV *)gv,0);
930867a8 2376 }
71c35c05 2377
e6066781 2378 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2379 return gv;
79072805
LW
2380}
2381
2382void
35a4481c 2383Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2384{
ed60a868 2385 const char *name;
35a4481c 2386 const HV * const hv = GvSTASH(gv);
7918f24d
NC
2387
2388 PERL_ARGS_ASSERT_GV_FULLNAME4;
2389
666ea192 2390 sv_setpv(sv, prefix ? prefix : "");
a0288114 2391
52a6327b 2392 if (hv && (name = HvNAME(hv))) {
ed60a868
FC
2393 const STRLEN len = HvNAMELEN(hv);
2394 if (keepmain || strnNE(name, "main", len)) {
2395 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2396 sv_catpvs(sv,"::");
ed60a868 2397 }
43693395 2398 }
ed60a868 2399 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2400 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2401}
2402
2403void
35a4481c 2404Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2405{
099be4f1 2406 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2407
2408 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2409
46c461b5 2410 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2411}
2412
39a65960
DM
2413
2414/* recursively scan a stash and any nested stashes looking for entries
2415 * that need the "only used once" warning raised
2416 */
2417
79072805 2418void
51da40ed 2419Perl_gv_check(pTHX_ HV *stash)
79072805 2420{
eb578fdb 2421 I32 i;
463ee0b2 2422
7918f24d
NC
2423 PERL_ARGS_ASSERT_GV_CHECK;
2424
9e5cda6b 2425 if (!SvOOK(stash))
8990e307 2426 return;
90754377 2427
9e5cda6b 2428 assert(HvARRAY(stash));
90754377 2429
a0d0e21e 2430 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2431 const HE *entry;
90754377 2432 /* mark stash is being scanned, to avoid recursing */
339441ef 2433 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2434 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2435 GV *gv;
b7787f18 2436 HV *hv;
e7acdfe9
DM
2437 STRLEN keylen = HeKLEN(entry);
2438 const char * const key = HeKEY(entry);
2439
2440 if (keylen >= 2 && key[keylen-2] == ':' && key[keylen-1] == ':' &&
159b6efe 2441 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2442 {
90754377
DM
2443 if (hv != PL_defstash && hv != stash
2444 && !(SvOOK(hv)
2445 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2446 )
a0d0e21e
LW
2447 gv_check(hv); /* nested package */
2448 }
ecad31f0
BF
2449 else if ( *HeKEY(entry) != '_'
2450 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2451 const char *file;
159b6efe 2452 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2453 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2454 continue;
1d7c1841 2455 file = GvFILE(gv);
1d7c1841 2456 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC
2457#ifdef USE_ITHREADS
2458 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2459#else
2460 CopFILEGV(PL_curcop)
2461 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2462#endif
9014280d 2463 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC
2464 "Name \"%"HEKf"::%"HEKf
2465 "\" used only once: possible typo",
2466 HEKfARG(HvNAME_HEK(stash)),
2467 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2468 }
79072805 2469 }
339441ef 2470 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW
2471 }
2472}
2473
2474GV *
9cc50d5b 2475Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2476{
9cc50d5b 2477 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2478 assert(!(flags & ~SVf_UTF8));
7918f24d 2479
b17a0679
FC
2480 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2481 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF
2482 (long)PL_gensym++),
2483 GV_ADD, SVt_PVGV);
79072805
LW
2484}
2485
2486/* hopefully this is only called on local symbol table entries */
2487
2488GP*
864dbfa3 2489Perl_gp_ref(pTHX_ GP *gp)
79072805 2490{
1d7c1841 2491 if (!gp)
d4c19fe8 2492 return NULL;
79072805 2493 gp->gp_refcnt++;
44a8e56a
PP
2494 if (gp->gp_cv) {
2495 if (gp->gp_cvgen) {
e1a479c5
BB
2496 /* If the GP they asked for a reference to contains
2497 a method cache entry, clear it first, so that we
2498 don't infect them with our cached entry */
e7881358 2499 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2500 gp->gp_cv = NULL;
44a8e56a
PP
2501 gp->gp_cvgen = 0;
2502 }
44a8e56a 2503 }
79072805 2504 return gp;
79072805
LW
2505}
2506
2507void
864dbfa3 2508Perl_gp_free(pTHX_ GV *gv)
79072805 2509{
79072805 2510 GP* gp;
b0d55c99 2511 int attempts = 100;
79072805 2512
f7877b28 2513 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2514 return;
f248d071 2515 if (gp->gp_refcnt == 0) {
9b387841
NC
2516 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2517 "Attempt to free unreferenced glob pointers"
2518 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2519 return;
2520 }
4571f4a7 2521 if (gp->gp_refcnt > 1) {
bc81b34d 2522 borrowed:
748a9306
LW
2523 if (gp->gp_egv == gv)
2524 gp->gp_egv = 0;
4571f4a7 2525 gp->gp_refcnt--;
c43ae56f 2526 GvGP_set(gv, NULL);
79072805 2527 return;
748a9306 2528 }
79072805 2529
b0d55c99
FC
2530 while (1) {
2531 /* Copy and null out all the glob slots, so destructors do not see
2532 freed SVs. */
2533 HEK * const file_hek = gp->gp_file_hek;
2534 SV * const sv = gp->gp_sv;
2535 AV * const av = gp->gp_av;
2536 HV * const hv = gp->gp_hv;
2537 IO * const io = gp->gp_io;
2538 CV * const cv = gp->gp_cv;
2539 CV * const form = gp->gp_form;
2540
2541 gp->gp_file_hek = NULL;
2542 gp->gp_sv = NULL;
2543 gp->gp_av = NULL;
2544 gp->gp_hv = NULL;
2545 gp->gp_io = NULL;
2546 gp->gp_cv = NULL;
2547 gp->gp_form = NULL;
2548
2549 if (file_hek)
2550 unshare_hek(file_hek);
2551
2552 SvREFCNT_dec(sv);
2553 SvREFCNT_dec(av);
2554 /* FIXME - another reference loop GV -> symtab -> GV ?
2555 Somehow gp->gp_hv can end up pointing at freed garbage. */
2556 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2557 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC
2558 if (PL_stashcache && hvname_hek) {
2559 DEBUG_o(Perl_deb(aTHX_
2560 "gp_free clearing PL_stashcache for '%"HEKf"'\n",
2561 HEKfARG(hvname_hek)));
0ca9877d 2562 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2563 }
b0d55c99
FC
2564 SvREFCNT_dec(hv);
2565 }
96d7c888
FC
2566 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2567 && (IoTYPE(io) == IoTYPE_WRONLY ||
2568 IoTYPE(io) == IoTYPE_RDWR ||
2569 IoTYPE(io) == IoTYPE_APPEND)
2570 && ckWARN_d(WARN_IO)
2571 && IoIFP(io) != PerlIO_stdin()
2572 && IoIFP(io) != PerlIO_stdout()
2573 && IoIFP(io) != PerlIO_stderr()
2574 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2575 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC
2576 SvREFCNT_dec(io);
2577 SvREFCNT_dec(cv);
2578 SvREFCNT_dec(form);
2579
bc81b34d
FC
2580 /* Possibly reallocated by a destructor */
2581 gp = GvGP(gv);
2582
b0d55c99
FC
2583 if (!gp->gp_file_hek
2584 && !gp->gp_sv
2585 && !gp->gp_av
2586 && !gp->gp_hv
2587 && !gp->gp_io
2588 && !gp->gp_cv
2589 && !gp->gp_form) break;
2590
2591 if (--attempts == 0) {
2592 Perl_die(aTHX_
2593 "panic: gp_free failed to free glob pointer - "
2594 "something is repeatedly re-creating entries"
2595 );
2596 }
13207a71 2597 }
748a9306 2598
bc81b34d
FC
2599 /* Possibly incremented by a destructor doing glob assignment */
2600 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2601 Safefree(gp);
c43ae56f 2602 GvGP_set(gv, NULL);
79072805
LW
2603}
2604
d460ef45
NIS
2605int
2606Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2607{
53c1dcc0
AL
2608 AMT * const amtp = (AMT*)mg->mg_ptr;
2609 PERL_UNUSED_ARG(sv);
dd374669 2610
7918f24d
NC
2611 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2612
d460ef45
NIS
2613 if (amtp && AMT_AMAGIC(amtp)) {
2614 int i;
2615 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2616 CV * const cv = amtp->table[i];
b37c2d43 2617 if (cv) {
e7881358 2618 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2619 amtp->table[i] = NULL;
d460ef45
NIS
2620 }
2621 }
2622 }
2623 return 0;
2624}
2625
a0d0e21e 2626/* Updates and caches the CV's */
c3a9a790
RGS
2627/* Returns:
2628 * 1 on success and there is some overload
2629 * 0 if there is no overload
2630 * -1 if some error occurred and it couldn't croak
2631 */
a0d0e21e 2632
c3a9a790 2633int
242f8760 2634Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2635{
ad64d0ec 2636 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2637 AMT amt;
9b439311 2638 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2639 U32 newgen;
a0d0e21e 2640
7918f24d
NC
2641 PERL_ARGS_ASSERT_GV_AMUPDATE;
2642
9b439311 2643 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2644 if (mg) {
2645 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2646 if (amtp->was_ok_sub == newgen) {
8c34e50d 2647 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2648 }
ad64d0ec 2649 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2650 }
a0d0e21e 2651
bfcb3514 2652 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2653
d460ef45 2654 Zero(&amt,1,AMT);
e1a479c5 2655 amt.was_ok_sub = newgen;
a6006777
PP
2656 amt.fallback = AMGfallNO;
2657 amt.flags = 0;
2658
a6006777 2659 {
8c34e50d
FC
2660 int filled = 0;
2661 int i;
3d147ac2
DM
2662 bool deref_seen = 0;
2663
a6006777 2664
3866ea3b 2665 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2666
89ffc314 2667 /* Try to find via inheritance. */
e6919483 2668 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2669 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2670 CV* cv;
89ffc314
IZ
2671
2672 if (!gv)
3866ea3b
FC
2673 {
2674 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2675 goto no_table;
3866ea3b
FC
2676 }
2677#ifdef PERL_DONT_CREATE_GVSV
2678 else if (!sv) {
6f207bd3 2679 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC
2680 }
2681#endif
79c9643d
JL
2682 else if (SvTRUE(sv))
2683 /* don't need to set overloading here because fallback => 1
2684 * is the default setting for classes without overloading */
89ffc314 2685 amt.fallback=AMGfallYES;
79c9643d
JL
2686 else if (SvOK(sv)) {
2687 amt.fallback=AMGfallNEVER;
386a5489 2688 filled = 1;
386a5489 2689 }
79c9643d 2690 else {
386a5489 2691 filled = 1;
386a5489 2692 }
a6006777 2693
3d147ac2 2694 assert(SvOOK(stash));
3d147ac2 2695 /* initially assume the worst */
339441ef 2696 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2697
8c34e50d 2698 for (i = 1; i < NofAMmeth; i++) {
6136c704 2699 const char * const cooky = PL_AMG_names[i];
32251b26 2700 /* Human-readable form, for debugging: */
8c34e50d 2701 const char * const cp = AMG_id2name(i);
d279ab82 2702 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2703
a0288114 2704 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2705 cp, HvNAME_get(stash)) );
611c1e95
IZ
2706 /* don't fill the cache while looking up!
2707 Creation of inheritance stubs in intermediate packages may
2708 conflict with the logic of runtime method substitution.
2709 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2710 then we could have created stubs for "(+0" in A and C too.
2711 But if B overloads "bool", we may want to use it for
2712 numifying instead of C's "+0". */
8c34e50d 2713 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2714 cv = 0;
c3ad4e54
FC
2715 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2716 const HEK * const gvhek =
2717 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2718 const HEK * const stashek =
2719 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2720 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2721 && stashek && HEK_LEN(stashek) == 8
2722 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ
2723 /* This is a hack to support autoloading..., while
2724 knowing *which* methods were declared as overloaded. */
44a8e56a 2725 /* GvSV contains the name of the method. */
6136c704 2726 GV *ngv = NULL;
c69033f2 2727 SV *gvsv = GvSV(gv);
a0288114
AL
2728
2729 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2730 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2731 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2732 if (!gvsv || !SvPOK(gvsv)
7f415459 2733 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2734 {
a0288114 2735 /* Can be an import stub (created by "can"). */
242f8760 2736 if (destructing) {
c3a9a790 2737 return -1;
242f8760
RGS
2738 }
2739 else {
d66cca07
BF
2740 const SV * const name = (gvsv && SvPOK(gvsv))
2741 ? gvsv
2742 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2743 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF
2744 Perl_croak(aTHX_ "%s method \"%"SVf256
2745 "\" overloading \"%s\" "\
d0c0e7dd 2746 "in package \"%"HEKf256"\"",
242f8760
RGS
2747 (GvCVGEN(gv) ? "Stub found while resolving"
2748 : "Can't resolve"),
d66cca07 2749 SVfARG(name), cp,
d0c0e7dd 2750 HEKfARG(
d66cca07 2751 HvNAME_HEK(stash)
d0c0e7dd 2752 ));
242f8760 2753 }
44a8e56a 2754 }
dc848c6f 2755 cv = GvCV(gv = ngv);
44a8e56a 2756 }
b464bac0 2757 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2758 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2759 GvNAME(CvGV(cv))) );
2760 filled = 1;
611c1e95 2761 } else if (gv) { /* Autoloaded... */
ea726b52 2762 cv = MUTABLE_CV(gv);
611c1e95 2763 filled = 1;
44a8e56a 2764 }
ea726b52 2765 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM
2766
2767 if (gv) {
2768 switch (i) {
2769 case to_sv_amg:
2770 case to_av_amg:
2771 case to_hv_amg:
2772 case to_gv_amg:
2773 case to_cv_amg:
2774 case nomethod_amg:
2775 deref_seen = 1;
2776 break;
2777 }
2778 }
a0d0e21e 2779 }
3d147ac2 2780 if (!deref_seen)
45479970
DM
2781 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2782 * NB - aux var invalid here, HvARRAY() could have been
2783 * reallocated since it was assigned to */
2784 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2785
a0d0e21e 2786 if (filled) {
a6006777 2787 AMT_AMAGIC_on(&amt);
ad64d0ec 2788 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2789 (char*)&amt, sizeof(AMT));
8c34e50d 2790 return TRUE;
a0d0e21e
LW
2791 }
2792 }
a6006777 2793 /* Here we have no table: */
8c34e50d 2794 no_table:
a6006777 2795 AMT_AMAGIC_off(&amt);
ad64d0ec 2796 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2797 (char*)&amt, sizeof(AMTS));
c3a9a790 2798 return 0;
a0d0e21e
LW
2799}
2800
32251b26
IZ
2801
2802CV*
2803Perl_gv_handler(pTHX_ HV *stash, I32 id)
2804{
3f8f4626 2805 MAGIC *mg;
32251b26 2806 AMT *amtp;
e1a479c5 2807 U32 newgen;
9b439311 2808 struct mro_meta* stash_meta;
32251b26 2809
bfcb3514 2810 if (!stash || !HvNAME_get(stash))
601f1833 2811 return NULL;
e1a479c5 2812
9b439311
BB
2813 stash_meta = HvMROMETA(stash);
2814 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2815
ad64d0ec 2816 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2817 if (!mg) {
2818 do_update:
8c34e50d 2819 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2820 return NULL;
ad64d0ec 2821 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2822 }
a9fd4e40 2823 assert(mg);
32251b26 2824 amtp = (AMT*)mg->mg_ptr;
66978156 2825 if ( amtp->was_ok_sub != newgen )
32251b26 2826 goto do_update;
3ad83ce7 2827 if (AMT_AMAGIC(amtp)) {
b7787f18 2828 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2829 if (ret && isGV(ret)) { /* Autoloading stab */
2830 /* Passing it through may have resulted in a warning
2831 "Inherited AUTOLOAD for a non-method deprecated", since
2832 our caller is going through a function call, not a method call.
2833 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2834 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2835
2836 if (gv && GvCV(gv))
2837 return GvCV(gv);
2838 }
2839 return ret;
2840 }
a0288114 2841
601f1833 2842 return NULL;
32251b26
IZ
2843}
2844
2845
6f1401dc
DM
2846/* Implement tryAMAGICun_MG macro.
2847 Do get magic, then see if the stack arg is overloaded and if so call it.
2848 Flags:
2849 AMGf_set return the arg using SETs rather than assigning to
2850 the targ
2851 AMGf_numeric apply sv_2num to the stack arg.
2852*/
2853
2854bool
2855Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM
2856 dSP;
2857 SV* tmpsv;
2858 SV* const arg = TOPs;
2859
2860 SvGETMAGIC(arg);
2861
9f8bf298 2862 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC
2863 AMGf_noright | AMGf_unary
2864 | (flags & AMGf_numarg))))
2865 {
6f1401dc
DM
2866 if (flags & AMGf_set) {
2867 SETs(tmpsv);
2868 }
2869 else {
2870 dTARGET;
2871 if (SvPADMY(TARG)) {
2872 sv_setsv(TARG, tmpsv);
2873 SETTARG;
2874 }
2875 else
2876 SETs(tmpsv);
2877 }
2878 PUTBACK;
2879 return TRUE;
2880 }
2881
2882 if ((flags & AMGf_numeric) && SvROK(arg))
2883 *sp = sv_2num(arg);
2884 return FALSE;
2885}
2886
2887
2888/* Implement tryAMAGICbin_MG macro.
2889 Do get magic, then see if the two stack args are overloaded and if so
2890 call it.
2891 Flags:
2892 AMGf_set return the arg using SETs rather than assigning to
2893 the targ
2894 AMGf_assign op may be called as mutator (eg +=)
2895 AMGf_numeric apply sv_2num to the stack arg.
2896*/
2897
2898bool
2899Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM
2900 dSP;
2901 SV* const left = TOPm1s;
2902 SV* const right = TOPs;
2903
2904 SvGETMAGIC(left);
2905 if (left != right)
2906 SvGETMAGIC(right);
2907
2908 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2909 SV * const tmpsv = amagic_call(left, right, method,
636ac8fc
FC
2910 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0)
2911 | (flags & AMGf_numarg));
6f1401dc
DM
2912 if (tmpsv) {
2913 if (flags & AMGf_set) {
2914 (void)POPs;
2915 SETs(tmpsv);
2916 }
2917 else {
2918 dATARGET;
2919 (void)POPs;
2920 if (opASSIGN || SvPADMY(TARG)) {
2921 sv_setsv(TARG, tmpsv);
2922 SETTARG;
2923 }
2924 else
2925 SETs(tmpsv);
2926 }
2927 PUTBACK;
2928 return TRUE;
2929 }
2930 }
75ea7a12
FC
2931 if(left==right && SvGMAGICAL(left)) {
2932 SV * const left = sv_newmortal();
2933 *(sp-1) = left;
2934 /* Print the uninitialized warning now, so it includes the vari-
2935 able name. */
2936 if (!SvOK(right)) {
2937 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2938 sv_setsv_flags(left, &PL_sv_no, 0);
2939 }
2940 else sv_setsv_flags(left, right, 0);
2941 SvGETMAGIC(right);
2942 }
6f1401dc 2943 if (flags & AMGf_numeric) {
75ea7a12
FC
2944 if (SvROK(TOPm1s))
2945 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
2946 if (SvROK(right))
2947 *sp = sv_2num(right);
2948 }
2949 return FALSE;
2950}
2951
25a9ffce
NC
2952SV *
2953Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2954 SV *tmpsv = NULL;
3d147ac2 2955 HV *stash;
25a9ffce
NC
2956
2957 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2958
3d147ac2
DM
2959 if (!SvAMAGIC(ref))
2960 return ref;
2961 /* return quickly if none of the deref ops are overloaded */
2962 stash = SvSTASH(SvRV(ref));
2963 assert(SvOOK(stash));
2964 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2965 return ref;
2966
2967 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC
2968 AMGf_noright | AMGf_unary))) {
2969 if (!SvROK(tmpsv))
2970 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2971 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2972 /* Bail out if it returns us the same reference. */
2973 return tmpsv;
2974 }
2975 ref = tmpsv;
3d147ac2
DM
2976 if (!SvAMAGIC(ref))
2977 break;
25a9ffce
NC
2978 }
2979 return tmpsv ? tmpsv : ref;
2980}
6f1401dc 2981
8d569291
FC
2982bool
2983Perl_amagic_is_enabled(pTHX_ int method)
2984{
2985 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2986
2987 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2988
2989 if ( !lex_mask || !SvOK(lex_mask) )
2990 /* overloading lexically disabled */
2991 return FALSE;
2992 else if ( lex_mask && SvPOK(lex_mask) ) {
2993 /* we have an entry in the hints hash, check if method has been
2994 * masked by overloading.pm */
2995 STRLEN len;
2996 const int offset = method / 8;
2997 const int bit = method % 8;
2998 char *pv = SvPV(lex_mask, len);
2999
3000 /* Bit set, so this overloading operator is disabled */
3001 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
3002 return FALSE;
3003 }
3004 return TRUE;
3005}
3006
a0d0e21e 3007SV*
864dbfa3 3008Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 3009{
27da23d5 3010 dVAR;
b267980d 3011 MAGIC *mg;
9c5ffd7c 3012 CV *cv=NULL;
a0d0e21e 3013 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3014 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
3015 int off = 0, off1, lr = 0, notfound = 0;
3016 int postpr = 0, force_cpy = 0;
3017 int assign = AMGf_assign & flags;
3018 const int assignshift = assign ? 1 : 0;
bf5522a1 3019 int use_default_op = 0;
67288365 3020 int force_scalar = 0;
497b47a8
JH
3021#ifdef DEBUGGING
3022 int fl=0;
497b47a8 3023#endif
25716404 3024 HV* stash=NULL;
7918f24d
NC
3025
3026 PERL_ARGS_ASSERT_AMAGIC_CALL;
3027
e46c382e 3028 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3029 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK
3030 }
3031
a0d0e21e 3032 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3033 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3034 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3035 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3036 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3037 : NULL))
b267980d 3038 && ((cv = cvp[off=method+assignshift])
748a9306
LW
3039 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3040 * usual method */
497b47a8
JH
3041 (
3042#ifdef DEBUGGING
3043 fl = 1,
a0288114 3044#endif
497b47a8 3045 cv = cvp[off=method])))) {
a0d0e21e
LW
3046 lr = -1; /* Call method for left argument */
3047 } else {
3048 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3049 int logic;
3050
3051 /* look for substituted methods */
ee239bfe 3052 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
3053 switch (method) {
3054 case inc_amg:
ee239bfe
IZ
3055 force_cpy = 1;
3056 if ((cv = cvp[off=add_ass_amg])
3057 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3058 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
3059 }
3060 break;
3061 case dec_amg:
ee239bfe
IZ
3062 force_cpy = 1;
3063 if ((cv = cvp[off = subtr_ass_amg])
3064 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3065 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
3066 }
3067 break;
3068 case bool__amg:
3069 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3070 break;
3071 case numer_amg:
3072 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3073 break;
3074 case string_amg:
3075 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3076 break;
b7787f18
AL
3077 case not_amg:
3078 (void)((cv = cvp[off=bool__amg])
3079 || (cv = cvp[off=numer_amg])
3080 || (cv = cvp[off=string_amg]));
2ab54efd
MB
3081 if (cv)
3082 postpr = 1;
b7787f18 3083 break;
748a9306
LW
3084 case copy_amg:
3085 {
76e3520e
GS
3086 /*
3087 * SV* ref causes confusion with the interpreter variable of
3088 * the same name
3089 */
890ce7af 3090 SV* const tmpRef=SvRV(left);
76e3520e 3091 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
3092 /*
3093 * Just to be extra cautious. Maybe in some
3094 * additional cases sv_setsv is safe, too.
3095 */
890ce7af 3096 SV* const newref = newSVsv(tmpRef);
748a9306 3097 SvOBJECT_on(newref);
a1cd65be
FC
3098 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3099 delegate to the stash. */
85fbaab2 3100 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
3101 return newref;
3102 }
3103 }
3104 break;
a0d0e21e 3105 case abs_amg:
b267980d 3106 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3107 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3108 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3109 if (off1==lt_amg) {
890ce7af 3110 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3111 lt_amg,AMGf_noright);
3112 logic = SvTRUE(lessp);
3113 } else {
890ce7af 3114 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3115 ncmp_amg,AMGf_noright);
3116 logic = (SvNV(lessp) < 0);
3117 }
3118 if (logic) {
3119 if (off==subtr_amg) {
3120 right = left;
748a9306 3121 left = nullsv;
a0d0e21e
LW
3122 lr = 1;
3123 }
3124 } else {
3125 return left;
3126 }
3127 }
3128 break;
3129 case neg_amg:
155aba94 3130 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW
3131 right = left;
3132 left = sv_2mortal(newSViv(0));
3133 lr = 1;
3134 }
3135 break;
f216259d 3136 case int_amg:
f5284f61 3137 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3138 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3139 case regexp_amg:
b267980d
NIS
3140 /* FAIL safe */
3141 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3142
f5284f61
IZ
3143 case to_sv_amg:
3144 case to_av_amg:
3145 case to_hv_amg:
3146 case to_gv_amg:
3147 case to_cv_amg:
3148 /* FAIL safe */
b267980d 3149 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3150
a0d0e21e
LW
3151 default:
3152 goto not_found;
3153 }
3154 if (!cv) goto not_found;
3155 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3156 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3157 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3158 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3159 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3160 : NULL))
69815d08
RS
3161 && (cv = cvp[off=method])) { /* Method for right
3162 * argument found */
3163 lr=1;
bf5522a1
MB
3164 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3165 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
3166 && !(flags & AMGf_unary)) {
3167 /* We look for substitution for
3168 * comparison operations and
fc36a67e 3169 * concatenation */
a0d0e21e
LW
3170 if (method==concat_amg || method==concat_ass_amg
3171 || method==repeat_amg || method==repeat_ass_amg) {
3172 return NULL; /* Delegate operation to string conversion */
3173 }
3174 off = -1;
3175 switch (method) {
3176 case lt_amg:
3177 case le_amg:
3178 case gt_amg:
3179 case ge_amg:
3180 case eq_amg:
3181 case ne_amg:
2ab54efd
MB
3182 off = ncmp_amg;
3183 break;
a0d0e21e
LW
3184 case slt_amg:
3185 case sle_amg:
3186 case sgt_amg:
3187 case sge_amg:
3188 case seq_amg:
3189 case sne_amg:
2ab54efd
MB
3190 off = scmp_amg;
3191 break;
a0d0e21e 3192 }
bf5522a1
MB
3193 if (off != -1) {
3194 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3195 cv = ocvp[off];
3196 lr = -1;
3197 }
3198 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3199 cv = cvp[off];
3200 lr = 1;
3201 }
3202 }
3203 if (cv)
2ab54efd
MB
3204 postpr = 1;
3205 else
3206 goto not_found;
a0d0e21e 3207 } else {
a6006777 3208 not_found: /* No method found, either report or croak */
b267980d
NIS
3209 switch (method) {
3210 case to_sv_amg:
3211 case to_av_amg:
3212 case to_hv_amg:
3213 case to_gv_amg:
3214 case to_cv_amg:
3215 /* FAIL safe */
3216 return left; /* Delegate operation to standard mechanisms. */
b267980d 3217 }
a0d0e21e
LW
3218 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3219 notfound = 1; lr = -1;
3220 } else if (cvp && (cv=cvp[nomethod_amg])) {
3221 notfound = 1; lr = 1;
bf5522a1
MB
3222 } else if ((use_default_op =
3223 (!ocvp || oamtp->fallback >= AMGfallYES)
3224 && (!cvp || amtp->fallback >= AMGfallYES))
3225 && !DEBUG_o_TEST) {
4cc0ca18
NC
3226 /* Skip generating the "no method found" message. */
3227 return NULL;
a0d0e21e 3228 } else {
46fc3d4c 3229 SV *msg;
774d564b 3230 if (off==-1) off=method;
b267980d 3231 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF
3232 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3233 AMG_id2name(method + assignshift),
3234 (flags & AMGf_unary ? " " : "\n\tleft "),
3235 SvAMAGIC(left)?
3236 "in overloaded package ":
3237 "has no overloaded magic",
3238 SvAMAGIC(left)?
3239 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3240 SVfARG(&PL_sv_no),
3241 SvAMAGIC(right)?
3242 ",\n\tright argument in overloaded package ":
3243 (flags & AMGf_unary
3244 ? ""
3245 : ",\n\tright argument has no overloaded magic"),
3246 SvAMAGIC(right)?
3247 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3248 SVfARG(&PL_sv_no)));
bf5522a1 3249 if (use_default_op) {
d66cca07 3250 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3251 } else {
be2597df 3252 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW
3253 }
3254 return NULL;
3255 }
ee239bfe 3256 force_cpy = force_cpy || assign;
a0d0e21e
LW
3257 }
3258 }
67288365
JL
3259
3260 switch (method) {
3261 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3262 * operation. we need this to return a value, so that it can be assigned
3263 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3264 * increment or decrement was itself called in void context */
3265 case inc_amg:
3266 if (off == add_amg)
3267 force_scalar = 1;
3268 break;
3269 case dec_amg:
3270 if (off == subtr_amg)
3271 force_scalar = 1;
3272 break;
3273 /* in these cases, we're calling an assignment variant of an operator
3274 * (+= rather than +, for instance). regardless of whether it's a
3275 * fallback or not, it always has to return a value, which will be
3276 * assigned to the proper variable later */
3277 case add_amg:
3278 case subtr_amg:
3279 case mult_amg:
3280 case div_amg:
3281 case modulo_amg:
3282 case pow_amg:
3283 case lshift_amg:
3284 case rshift_amg:
3285 case repeat_amg:
3286 case concat_amg:
3287 case band_amg:
3288 case bor_amg:
3289 case bxor_amg:
6d06ecce
FC
3290 case sband_amg:
3291 case sbor_amg:
3292 case sbxor_amg:
67288365
JL
3293 if (assign)
3294 force_scalar = 1;
3295 break;
3296 /* the copy constructor always needs to return a value */
3297 case copy_amg:
3298 force_scalar = 1;
3299 break;
3300 /* because of the way these are implemented (they don't perform the
3301 * dereferencing themselves, they return a reference that perl then
3302 * dereferences later), they always have to be in scalar context */
3303 case to_sv_amg:
3304 case to_av_amg:
3305 case to_hv_amg:
3306 case to_gv_amg:
3307 case to_cv_amg:
3308 force_scalar = 1;
3309 break;
3310 /* these don't have an op of their own; they're triggered by their parent
3311 * op, so the context there isn't meaningful ('$a and foo()' in void
3312 * context still needs to pass scalar context on to $a's bool overload) */
3313 case bool__amg:
3314 case numer_amg:
3315 case string_amg:
3316 force_scalar = 1;
3317 break;
3318 }
3319
497b47a8 3320#ifdef DEBUGGING
a0d0e21e 3321 if (!notfound) {
497b47a8 3322 DEBUG_o(Perl_deb(aTHX_
d66cca07 3323 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH
3324 AMG_id2name(off),
3325 method+assignshift==off? "" :
a0288114 3326 " (initially \"",
497b47a8
JH
3327 method+assignshift==off? "" :
3328 AMG_id2name(method+assignshift),
a0288114 3329 method+assignshift==off? "" : "\")",
497b47a8
JH
3330 flags & AMGf_unary? "" :
3331 lr==1 ? " for right argument": " for left argument",
3332 flags & AMGf_unary? " for argument" : "",
d66cca07 3333 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3334 fl? ",\n\tassignment variant used": "") );
ee239bfe 3335 }
497b47a8 3336#endif
748a9306
LW
3337 /* Since we use shallow copy during assignment, we need
3338 * to dublicate the contents, probably calling user-supplied
3339 * version of copy operator
3340 */
ee239bfe
IZ
3341 /* We need to copy in following cases:
3342 * a) Assignment form was called.
3343 * assignshift==1, assign==T, method + 1 == off
3344 * b) Increment or decrement, called directly.
3345 * assignshift==0, assign==0, method + 0 == off
3346 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3347 * assignshift==0, assign==T,
ee239bfe
IZ
3348 * force_cpy == T
3349 * d) Increment or decrement, translated to nomethod.
b267980d 3350 * assignshift==0, assign==0,
ee239bfe
IZ
3351 * force_cpy == T
3352 * e) Assignment form translated to nomethod.
3353 * assignshift==1, assign==T, method + 1 != off
3354 * force_cpy == T
3355 */
3356 /* off is method, method+assignshift, or a result of opcode substitution.
3357 * In the latter case assignshift==0, so only notfound case is important.
3358 */
73512201 3359 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3360 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3361 || force_cpy) )
6f1401dc 3362 {
1b38c28e
NC
3363 /* newSVsv does not behave as advertised, so we copy missing
3364 * information by hand */
3365 SV *tmpRef = SvRV(left);
3366 SV *rv_copy;
31d632c3 3367 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
3368 SvRV_set(left, rv_copy);
3369 SvSETMAGIC(left);
e7881358 3370 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3371 }
6f1401dc
DM
3372 }
3373
a0d0e21e
LW
3374 {
3375 dSP;
3376 BINOP myop;
3377 SV* res;
b7787f18 3378 const bool oldcatch = CATCH_GET;
67288365 3379 I32 oldmark, nret;
1c23e2bd 3380 U8 gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3381
54310121 3382 CATCH_SET(TRUE);
a0d0e21e
LW
3383 Zero(&myop, 1, BINOP);
3384 myop.op_last = (OP *) &myop;
b37c2d43 3385 myop.op_next = NULL;
67288365
JL
3386 myop.op_flags = OPf_STACKED;
3387
3388 switch (gimme) {
3389 case G_VOID:
3390 myop.op_flags |= OPf_WANT_VOID;
3391 break;
3392 case G_ARRAY:
3393 if (flags & AMGf_want_list) {
3394 myop.op_flags |= OPf_WANT_LIST;
3395 break;
3396 }
3397 /* FALLTHROUGH */
3398 default:
3399 myop.op_flags |= OPf_WANT_SCALAR;
3400 break;
3401 }
a0d0e21e 3402
e788e7d3 3403 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3404 ENTER;
462e5cf6 3405 SAVEOP();
533c011a 3406 PL_op = (OP *) &myop;
3280af22 3407 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3408 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3409 Perl_pp_pushmark(aTHX);
a0d0e21e 3410
924508f0 3411 EXTEND(SP, notfound + 5);
a0d0e21e
LW
3412 PUSHs(lr>0? right: left);
3413 PUSHs(lr>0? left: right);
3280af22 3414 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3415 if (notfound) {
59cd0e26
NC
3416 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3417 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3418 }
636ac8fc
FC
3419 else if (flags & AMGf_numarg)
3420 PUSHs(&PL_sv_undef);
3421 if (flags & AMGf_numarg)
3422 PUSHs(&PL_sv_yes);
ad64d0ec 3423 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3424 PUTBACK;
67288365 3425 oldmark = TOPMARK;
a0d0e21e 3426
139d0ce6 3427 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3428 CALLRUNOPS(aTHX);
a0d0e21e
LW
3429 LEAVE;
3430 SPAGAIN;
67288365
JL
3431 nret = SP - (PL_stack_base + oldmark);
3432
3433 switch (gimme) {
3434 case G_VOID:
3435 /* returning NULL has another meaning, and we check the context
3436 * at the call site too, so this can be differentiated from the
3437 * scalar case */
3438 res = &PL_sv_undef;
3439 SP = PL_stack_base + oldmark;
3440 break;
3441 case G_ARRAY: {
3442 if (flags & AMGf_want_list) {
3443 res = sv_2mortal((SV *)newAV());
3444 av_extend((AV *)res, nret);
3445 while (nret--)
3446 av_store((AV *)res, nret, POPs);
3447 break;
3448 }
3449 /* FALLTHROUGH */
3450 }
3451 default:
3452 res = POPs;
3453 break;
3454 }
a0d0e21e 3455
ebafeae7 3456 PUTBACK;
d3acc0f7 3457 POPSTACK;
54310121 3458 CATCH_SET(oldcatch);
a0d0e21e 3459
a0d0e21e 3460 if (postpr) {
b7787f18 3461 int ans;
a0d0e21e
LW
3462 switch (method) {
3463 case le_amg:
3464 case sle_amg:
3465 ans=SvIV(res)<=0; break;
3466 case lt_amg:
3467 case slt_amg:
3468 ans=SvIV(res)<0; break;
3469 case ge_amg:
3470 case sge_amg:
3471 ans=SvIV(res)>=0; break;
3472 case gt_amg:
3473 case sgt_amg:
3474 ans=SvIV(res)>0; break;
3475 case eq_amg:
3476 case seq_amg:
3477 ans=SvIV(res)==0; break;
3478 case ne_amg:
3479 case sne_amg:
3480 ans=SvIV(res)!=0; break;
3481 case inc_amg:
3482 case dec_amg:
bbce6d69 3483 SvSetSV(left,res); return left;
dc437b57 3484 case not_amg:
fe7ac86a 3485 ans=!SvTRUE(res); break;
b7787f18
AL
3486 default:
3487 ans=0; break;
a0d0e21e 3488 }
54310121 3489 return boolSV(ans);
748a9306
LW
3490 } else if (method==copy_amg) {
3491 if (!SvROK(res)) {
cea2e8a9 3492 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
3493 }
3494 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
3495 } else {
3496 return res;
3497 }
3498 }
3499}
c9d5ac95 3500
f5c1e807
NC
3501void
3502Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3503{
3504 dVAR;
acda4c6a 3505 U32 hash;
f5c1e807 3506
7918f24d 3507 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3508
acda4c6a
NC
3509 if (len > I32_MAX)
3510 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3511
ae8cc45f
NC
3512 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3513 unshare_hek(GvNAME_HEK(gv));
3514 }
3515
acda4c6a 3516 PERL_HASH(hash, name, len);
c60dbbc3 3517 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC
3518}
3519
66610fdd 3520/*
f7461760
Z
3521=for apidoc gv_try_downgrade
3522
2867cdbc
Z
3523If the typeglob C<gv> can be expressed more succinctly, by having
3524something other than a real GV in its place in the stash, replace it
3525with the optimised form. Basic requirements for this are that C<gv>
3526is a real typeglob, is sufficiently ordinary, and is only referenced
3527from its package. This function is meant to be used when a GV has been
3528looked up in part to see what was there, causing upgrading, but based
3529on what was found it turns out that the real GV isn't required after all.
3530
3531If C<gv> is a completely empty typeglob, it is deleted from the stash.
3532
3533If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3534sub, the typeglob is replaced with a scalar-reference placeholder that
3535more compactly represents the same thing.
f7461760
Z
3536
3537=cut
3538*/
3539
3540void
3541Perl_gv_try_downgrade(pTHX_ GV *gv)
3542{
3543 HV *stash;
3544 CV *cv;
3545 HEK *namehek;
3546 SV **gvp;
3547 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC
3548
3549 /* XXX Why and where does this leave dangling pointers during global
3550 destruction? */
627364f1 3551 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3552
2867cdbc 3553 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3554 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3555 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3556 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3557 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3558 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3559 return;
2be08ad1
FC
3560 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3561 return;
803f2748
DM
3562 if (SvMAGICAL(gv)) {
3563 MAGIC *mg;
3564 /* only backref magic is allowed */
3565 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3566 return;
3567 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3568 if (mg->mg_type != PERL_MAGIC_backref)
3569 return;
3570 }
3571 }
2867cdbc
Z
3572 cv = GvCV(gv);
3573 if (!cv) {
3574 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3575 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3576 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3577 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3578 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z
3579 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3580 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3581 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3582 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z
3583 *gvp == (SV*)gv) {
3584 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3585 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z
3586 SvREFCNT(gv) = 0;
3587 sv_clear((SV*)gv);
3588 SvREFCNT(gv) = 1;
70e5f2b5 3589 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH
3590
3591 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z
3592 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3593 STRUCT_OFFSET(XPVIV, xiv_iv));
3594 SvRV_set(gv, value);
3595 }
3596}
3597
9e3fb20c
FC
3598GV *
3599Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3600{
3601 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3602 GV * const *gvp;
3603 PERL_ARGS_ASSERT_GV_OVERRIDE;
3604 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3605 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3606 gv = gvp ? *gvp : NULL;
3607 if (gv && !isGV(gv)) {
3608 if (!SvPCS_IMPORTED(gv)) return NULL;
3609 gv_init(gv, PL_globalstash, name, len, 0);
3610 return gv;
3611 }
3612 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3613}
3614
4aaa4757
FC
3615#include "XSUB.h"
3616
3617static void
3618core_xsub(pTHX_ CV* cv)
3619{
3620 Perl_croak(aTHX_
3621 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3622 );
3623}
3624
f7461760 3625/*
14d04a33 3626 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3627 */