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[perl5.git] / gv.c
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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW		 9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW		 14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW		 20 */
21
ccfc67b7
JH		 22/*
23=head1 GV Functions
166f8a29
DM		 24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH		 32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
6ffcffbd 37#include "overload.inc"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a 41static const char S_autoload[] = "AUTOLOAD";
3c81f0b3 42#define S_autolen (sizeof("AUTOLOAD")-1)
5c7983e5 43
13c59d41
MH		 44GV *
45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13c59d41
MH		 49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
13be902c 53 && SvTYPE((const SV *)gv) != SVt_PVLV
13c59d41 54 )
13be902c 55 ) {
bb85b28a 56 const char *what;
13c59d41 57 if (type == SVt_PVIO) {
bb85b28a
NC		 58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
13c59d41 64 } else if (type == SVt_PVHV) {
bb85b28a
NC		 65 what = "hash";
66 } else {
13c59d41 67 what = type == SVt_PVAV ? "array" : "scalar";
bb85b28a 68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC		 70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896 72
13c59d41
MH		 73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
13c59d41
MH		 83 if (!*where)
84 {
85 *where = newSV_type(type);
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
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));
81d52ecd 388
42d0e0b7 389 default: NOOP;
5c1f4d79 390 }
756cb477
NC		 391 SvRV_set(gv, NULL);
392 SvROK_off(gv);
393 }
463ee0b2 394
3b6733bf
NC		 395
396 if (old_type < SVt_PVGV) {
397 if (old_type >= SVt_PV)
398 SvCUR_set(gv, 0);
ad64d0ec 399 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 400 }
55d729e4
GS		 401 if (SvLEN(gv)) {
402 if (proto) {
f880fe2f 403 SvPV_set(gv, NULL);
b162af07 404 SvLEN_set(gv, 0);
55d729e4
GS		 405 SvPOK_off(gv);
406 } else
94010e71 407 Safefree(SvPVX_mutable(gv));
55d729e4 408 }
2e5b91de
NC		 409 SvIOK_off(gv);
410 isGV_with_GP_on(gv);
12816592 411
c43ae56f 412 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC		 413 GvSTASH(gv) = stash;
414 if (stash)
ad64d0ec 415 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 416 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 417 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
418 GvMULTI_on(gv); /* _was_ mentioned */
2eaf799e
FC		 419 if (has_constant && SvTYPE(has_constant) == SVt_PVCV) {
420 /* Not actually a constant. Just a regular sub. */
421 CV * const cv = (CV *)has_constant;
422 GvCV_set(gv,cv);
423 if (CvSTASH(cv) == stash && (
424 CvNAME_HEK(cv) == GvNAME_HEK(gv)
425 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
426 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
427 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
428 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
429 )
430 ))
431 CvGV_set(cv,gv);
432 }
433 else if (doproto) {
e3d2b9e7 434 CV *cv;
756cb477
NC		 435 if (has_constant) {
436 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 437 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 438 /* In case op.c:S_process_special_blocks stole it: */
439 if (!GvCV(gv))
c43ae56f 440 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 441 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 442 /* If this reference was a copy of another, then the subroutine
443 must have been "imported", by a Perl space assignment to a GV
444 from a reference to CV. */
445 if (exported_constant)
446 GvIMPORTED_CV_on(gv);
186a5ba8 447 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 448 } else {
186a5ba8 449 cv = newSTUB(gv,1);
756cb477 450 }
55d729e4 451 if (proto) {
e3d2b9e7 452 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 453 SV_HAS_TRAILING_NUL);
e0260a5b 454 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 455 }
456 }
463ee0b2
LW		 457}
458
76e3520e 459STATIC void
e6066781 460S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 461{
13c59d41
MH		 462 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
463
464 switch (sv_type) {
465 case SVt_PVIO:
466 (void)GvIOn(gv);
467 break;
468 case SVt_PVAV:
469 (void)GvAVn(gv);
470 break;
471 case SVt_PVHV:
472 (void)GvHVn(gv);
473 break;
c69033f2 474#ifdef PERL_DONT_CREATE_GVSV
13c59d41
MH		 475 case SVt_NULL:
476 case SVt_PVCV:
477 case SVt_PVFM:
478 case SVt_PVGV:
479 break;
480 default:
481 if(GvSVn(gv)) {
482 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
483 If we just cast GvSVn(gv) to void, it ignores evaluating it for
484 its side effect */
485 }
c69033f2 486#endif
a0d0e21e
LW		 487 }
488}
489
0f8d4b5e
FC		 490static void core_xsub(pTHX_ CV* cv);
491
492static GV *
493S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 494 const char * const name, const STRLEN len)
0f8d4b5e
FC		 495{
496 const int code = keyword(name, len, 1);
497 static const char file[] = __FILE__;
97021f77 498 CV *cv, *oldcompcv = NULL;
0f8d4b5e 499 int opnum = 0;
0f8d4b5e 500 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 501 COP *oldcurcop = NULL;
502 yy_parser *oldparser = NULL;
503 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 504
505 assert(gv || stash);
506 assert(name);
0f8d4b5e 507
88b892d8
FC		 508 if (!code) return NULL; /* Not a keyword */
509 switch (code < 0 ? -code : code) {
0f8d4b5e 510 /* no support for \&CORE::infix;
d885f758 511 no support for funcs that do not parse like funcs */
88b892d8 512 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 513 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 514 case KEY_default : case KEY_DESTROY:
88b892d8 515 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 516 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 517 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 518 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC		 519 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
520 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
521 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 522 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 523 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 524 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 525 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 526 case KEY_state: case KEY_sub :
46bef06f 527 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC		 528 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
529 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 530 return NULL;
531 case KEY_chdir:
eb31eb35 532 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 533 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC		 534 case KEY_keys:
535 case KEY_lstat:
536 case KEY_pop:
537 case KEY_push:
538 case KEY_shift:
a99f2ca2 539 case KEY_splice: case KEY_split:
0f8d4b5e
FC		 540 case KEY_stat:
541 case KEY_system:
542 case KEY_truncate: case KEY_unlink:
543 case KEY_unshift:
544 case KEY_values:
545 ampable = FALSE;
546 }
547 if (!gv) {
548 gv = (GV *)newSV(0);
549 gv_init(gv, stash, name, len, TRUE);
550 }
7e68c38b 551 GvMULTI_on(gv);
0f8d4b5e
FC		 552 if (ampable) {
553 ENTER;
554 oldcurcop = PL_curcop;
555 oldparser = PL_parser;
556 lex_start(NULL, NULL, 0);
557 oldcompcv = PL_compcv;
558 PL_compcv = NULL; /* Prevent start_subparse from setting
559 CvOUTSIDE. */
560 oldsavestack_ix = start_subparse(FALSE,0);
561 cv = PL_compcv;
562 }
563 else {
564 /* Avoid calling newXS, as it calls us, and things start to
565 get hairy. */
566 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
567 GvCV_set(gv,cv);
568 GvCVGEN(gv) = 0;
0f8d4b5e
FC		 569 CvISXSUB_on(cv);
570 CvXSUB(cv) = core_xsub;
eacbb379 571 PoisonPADLIST(cv);
0f8d4b5e
FC		 572 }
573 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
574 from PL_curcop. */
9b669ea1
DD		 575 /* XSUBs can't be perl lang/perl5db.pl debugged
576 if (PERLDB_LINE_OR_SAVESRC)
577 (void)gv_fetchfile(file); */
0f8d4b5e
FC		 578 CvFILE(cv) = (char *)file;
579 /* XXX This is inefficient, as doing things this order causes
580 a prototype check in newATTRSUB. But we have to do
581 it this order as we need an op number before calling
582 new ATTRSUB. */
583 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 584 if (stash)
73c02f15 585 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 586 if (ampable) {
4428fb0e
TC		 587#ifdef DEBUGGING
588 CV *orig_cv = cv;
589#endif
0f8d4b5e 590 CvLVALUE_on(cv);
4428fb0e
TC		 591 /* newATTRSUB will free the CV and return NULL if we're still
592 compiling after a syntax error */
e8f91c91 593 if ((cv = newATTRSUB_x(
7e68c38b 594 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 595 NULL,NULL,
596 coresub_op(
597 opnum
598 ? newSVuv((UV)opnum)
599 : newSVpvn(name,len),
600 code, opnum
7e68c38b 601 ),
e8f91c91 602 TRUE
4428fb0e
TC		 603 )) != NULL) {
604 assert(GvCV(gv) == orig_cv);
605 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
606 && opnum != OP_UNDEF)
607 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
608 }
0f8d4b5e
FC		 609 LEAVE;
610 PL_parser = oldparser;
611 PL_curcop = oldcurcop;
612 PL_compcv = oldcompcv;
613 }
4428fb0e
TC		 614 if (cv) {
615 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
616 cv_set_call_checker(
617 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
618 );
619 SvREFCNT_dec(opnumsv);
620 }
621
0f8d4b5e
FC		 622 return gv;
623}
624
954c1994 625/*
6c53d59b
FC		 626=for apidoc gv_fetchmeth
627
628Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
629
e6919483
BF		 630=for apidoc gv_fetchmeth_sv
631
632Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
633of an SV instead of a string/length pair.
634
635=cut
636*/
637
638GV *
639Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
640{
c290e187 641 char *namepv;
642 STRLEN namelen;
643 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
644 if (LIKELY(SvPOK_nog(namesv))) /* common case */
645 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, flags);
646 namepv = SvPV(namesv, namelen);
647 if (SvUTF8(namesv)) flags |= SVf_UTF8;
648 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF		 649}
650
651/*
652=for apidoc gv_fetchmeth_pv
653
654Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
655instead of a string/length pair.
656
657=cut
658*/
659
660GV *
661Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
662{
663 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 664 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF		 665}
666
667/*
668=for apidoc gv_fetchmeth_pvn
954c1994
GS		 669
670Returns the glob with the given C<name> and a defined subroutine or
671C<NULL>. The glob lives in the given C<stash>, or in the stashes
796b6530 672accessible via C<@ISA> and C<UNIVERSAL::>.
954c1994
GS		 673
674The argument C<level> should be either 0 or -1. If C<level==0>, as a
675side-effect creates a glob with the given C<name> in the given C<stash>
676which in the case of success contains an alias for the subroutine, and sets
e1a479c5 677up caching info for this glob.
954c1994 678
796b6530 679The only significant values for C<flags> are C<GV_SUPER> and C<SVf_UTF8>.
aae43805 680
796b6530 681C<GV_SUPER> indicates that we want to look up the method in the superclasses
aae43805 682of the C<stash>.
e6919483 683
aae43805 684The
954c1994 685GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 686visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 687the GV directly; instead, you should use the method's CV, which can be
b267980d 688obtained from the GV with the C<GvCV> macro.
954c1994
GS		 689
690=cut
691*/
692
e1a479c5
BB		 693/* NOTE: No support for tied ISA */
694
c6afe666 695PERL_STATIC_INLINE GV*
696S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 697{
463ee0b2 698 GV** gvp;
c6afe666 699 HE* he;
e1a479c5
BB		 700 AV* linear_av;
701 SV** linear_svp;
702 SV* linear_sv;
aae43805 703 HV* cstash, *cachestash;
e1a479c5
BB		 704 GV* candidate = NULL;
705 CV* cand_cv = NULL;
e1a479c5 706 GV* topgv = NULL;
bfcb3514 707 const char *hvname;
c6afe666 708 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 709 I32 items;
e1a479c5 710 U32 topgen_cmp;
04f3bf56 711 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 712
af09ea45
IK		 713 /* UNIVERSAL methods should be callable without a stash */
714 if (!stash) {
e1a479c5 715 create = 0; /* probably appropriate */
da51bb9b 716 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 717 return 0;
718 }
719
e1a479c5
BB		 720 assert(stash);
721
bfcb3514
NC		 722 hvname = HvNAME_get(stash);
723 if (!hvname)
e1a479c5 724 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 725
e1a479c5 726 assert(hvname);
55df6700 727 assert(name || meth);
463ee0b2 728
aae43805 729 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC		 730 flags & GV_SUPER ? "SUPER " : "",
731 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 732
dd69841b 733 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 734
aae43805 735 if (flags & GV_SUPER) {
1a33a059
FC		 736 if (!HvAUX(stash)->xhv_mro_meta->super)
737 HvAUX(stash)->xhv_mro_meta->super = newHV();
738 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC		 739 }
740 else cachestash = stash;
741
e1a479c5 742 /* check locally for a real method or a cache entry */
c6afe666 743 he = (HE*)hv_common(
744 cachestash, meth, name, len, (flags & SVf_UTF8) ? HVhek_UTF8 : 0, create, NULL, 0
745 );
746 if (he) gvp = (GV**)&HeVAL(he);
747 else gvp = NULL;
748
e1a479c5
BB		 749 if(gvp) {
750 topgv = *gvp;
0f8d4b5e 751 have_gv:
e1a479c5
BB		 752 assert(topgv);
753 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC		 754 {
755 if (!name)
756 name = SvPV_nomg(meth, len);
04ec7e59 757 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 758 }
e1a479c5
BB		 759 if ((cand_cv = GvCV(topgv))) {
760 /* If genuine method or valid cache entry, use it */
761 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
762 return topgv;
763 }
764 else {
765 /* stale cache entry, junk it and move on */
e7881358 766 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 767 GvCV_set(topgv, NULL);
768 cand_cv = NULL;
e1a479c5
BB		 769 GvCVGEN(topgv) = 0;
770 }
771 }
772 else if (GvCVGEN(topgv) == topgen_cmp) {
773 /* cache indicates no such method definitively */
774 return 0;
775 }
aae43805
FC		 776 else if (stash == cachestash
777 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 778 && strnEQ(hvname, "CORE", 4)
87566176 779 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 780 goto have_gv;
463ee0b2 781 }
79072805 782
aae43805 783 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 784 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
785 items = AvFILLp(linear_av); /* no +1, to skip over self */
786 while (items--) {
787 linear_sv = *linear_svp++;
788 assert(linear_sv);
789 cstash = gv_stashsv(linear_sv, 0);
790
dd69841b 791 if (!cstash) {
ecad31f0 792 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 793 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 794 SVfARG(linear_sv),
d0c0e7dd 795 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 796 continue;
797 }
9607fc9c 798
e1a479c5
BB		 799 assert(cstash);
800
c60dbbc3 801 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 802 if (!gvp) {
803 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
804 const char *hvname = HvNAME(cstash); assert(hvname);
805 if (strnEQ(hvname, "CORE", 4)
806 && (candidate =
87566176 807 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 808 ))
809 goto have_candidate;
810 }
811 continue;
812 }
813 else candidate = *gvp;
814 have_candidate:
e1a479c5 815 assert(candidate);
04f3bf56 816 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 817 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 818 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
819 /*
820 * Found real method, cache method in topgv if:
821 * 1. topgv has no synonyms (else inheritance crosses wires)
822 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
823 */
824 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 825 CV *old_cv = GvCV(topgv);
826 SvREFCNT_dec(old_cv);
e1a479c5 827 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 828 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 829 GvCVGEN(topgv) = topgen_cmp;
830 }
831 return candidate;
832 }
833 }
9607fc9c 834
e1a479c5
BB		 835 /* Check UNIVERSAL without caching */
836 if(level == 0 || level == -1) {
55df6700
FC		 837 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
838 flags &~GV_SUPER);
e1a479c5
BB		 839 if(candidate) {
840 cand_cv = GvCV(candidate);
841 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 842 CV *old_cv = GvCV(topgv);
843 SvREFCNT_dec(old_cv);
e1a479c5 844 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 845 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 846 GvCVGEN(topgv) = topgen_cmp;
847 }
848 return candidate;
849 }
850 }
851
852 if (topgv && GvREFCNT(topgv) == 1) {
853 /* cache the fact that the method is not defined */
854 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 855 }
856
79072805
LW		 857 return 0;
858}
859
c6afe666 860GV *
861Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
862{
863 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
864 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
865}
866
954c1994 867/*
460e5730
FC		 868=for apidoc gv_fetchmeth_autoload
869
870This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
871parameter.
872
d21989ed 873=for apidoc gv_fetchmeth_sv_autoload
611c1e95 874
d21989ed
BF		 875Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
876of an SV instead of a string/length pair.
877
878=cut
879*/
880
881GV *
882Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
883{
884 char *namepv;
885 STRLEN namelen;
886 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
887 namepv = SvPV(namesv, namelen);
888 if (SvUTF8(namesv))
889 flags |= SVf_UTF8;
890 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
891}
892
893/*
894=for apidoc gv_fetchmeth_pv_autoload
895
896Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
897instead of a string/length pair.
898
899=cut
900*/
901
902GV *
903Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
904{
905 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
906 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
907}
908
909/*
910=for apidoc gv_fetchmeth_pvn_autoload
911
796b6530 912Same as C<gv_fetchmeth_pvn()>, but looks for autoloaded subroutines too.
611c1e95
IZ		 913Returns a glob for the subroutine.
914
915For an autoloaded subroutine without a GV, will create a GV even
796b6530 916if C<level < 0>. For an autoloaded subroutine without a stub, C<GvCV()>
611c1e95
IZ		 917of the result may be zero.
918
796b6530 919Currently, the only significant value for C<flags> is C<SVf_UTF8>.
d21989ed 920
611c1e95
IZ		 921=cut
922*/
923
924GV *
d21989ed 925Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 926{
499321d3 927 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 928
d21989ed 929 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 930
611c1e95 931 if (!gv) {
611c1e95
IZ		 932 CV *cv;
933 GV **gvp;
934
935 if (!stash)
6136c704 936 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 937 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 938 return NULL;
d21989ed 939 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 940 return NULL;
611c1e95
IZ		 941 cv = GvCV(gv);
942 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 943 return NULL;
611c1e95
IZ		 944 /* Have an autoload */
945 if (level < 0) /* Cannot do without a stub */
d21989ed 946 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 947 gvp = (GV**)hv_fetch(stash, name,
948 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 949 if (!gvp)
6136c704 950 return NULL;
611c1e95
IZ		 951 return *gvp;
952 }
953 return gv;
954}
955
956/*
954c1994
GS		 957=for apidoc gv_fetchmethod_autoload
958
959Returns the glob which contains the subroutine to call to invoke the method
960on the C<stash>. In fact in the presence of autoloading this may be the
796b6530 961glob for "AUTOLOAD". In this case the corresponding variable C<$AUTOLOAD> is
b267980d 962already setup.
954c1994
GS		 963
964The third parameter of C<gv_fetchmethod_autoload> determines whether
965AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 966means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 967Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 968with a non-zero C<autoload> parameter.
954c1994 969
cec2d7b1
FC		 970These functions grant C<"SUPER"> token
971as a prefix of the method name. Note
954c1994
GS		 972that if you want to keep the returned glob for a long time, you need to
973check for it being "AUTOLOAD", since at the later time the call may load a
796b6530 974different subroutine due to C<$AUTOLOAD> changing its value. Use the glob
cec2d7b1 975created as a side effect to do this.
954c1994 976
cec2d7b1
FC		 977These functions have the same side-effects as C<gv_fetchmeth> with
978C<level==0>. The warning against passing the GV returned by
979C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS		 980
981=cut
982*/
983
dc848c6f 984GV *
864dbfa3 985Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 986{
547bb267
NC		 987 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
988
256d1bb2
NC		 989 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
990}
991
44130a26
BF		 992GV *
993Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
994{
995 char *namepv;
996 STRLEN namelen;
997 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
998 namepv = SvPV(namesv, namelen);
999 if (SvUTF8(namesv))
1000 flags |= SVf_UTF8;
1001 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
1002}
1003
1004GV *
1005Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1006{
1007 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1008 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1009}
1010
256d1bb2
NC		 1011/* Don't merge this yet, as it's likely to get a len parameter, and possibly
1012 even a U32 hash */
1013GV *
44130a26 1014Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1015{
eb578fdb 1016 const char *nend;
c445ea15 1017 const char *nsplit = NULL;
a0d0e21e 1018 GV* gv;
0dae17bd 1019 HV* ostash = stash;
c94593d0 1020 const char * const origname = name;
ad64d0ec 1021 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 1022 const U32 autoload = flags & GV_AUTOLOAD;
1023 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1024 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1025
44130a26 1026 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1027
eff494dd 1028 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1029 stash = NULL;
c9bf4021
NC		 1030 else {
1031 /* The only way stash can become NULL later on is if nsplit is set,
1032 which in turn means that there is no need for a SVt_PVHV case
1033 the error reporting code. */
1034 }
b267980d 1035
44130a26 1036 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 1037 if (*nend == '\'') {
a0d0e21e 1038 nsplit = nend;
c94593d0
NC		 1039 name = nend + 1;
1040 }
1041 else if (*nend == ':' && *(nend + 1) == ':') {
1042 nsplit = nend++;
1043 name = nend + 1;
1044 }
a0d0e21e
LW		 1045 }
1046 if (nsplit) {
7edbdc6b 1047 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 1048 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 1049 stash = CopSTASH(PL_curcop);
1050 flags |= GV_SUPER;
cea2e8a9 1051 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1052 origname, HvENAME_get(stash), name) );
4633a7c4 1053 }
aae43805
FC		 1054 else if ((nsplit - origname) >= 7 &&
1055 strnEQ(nsplit - 7, "::SUPER", 7)) {
1056 /* don't autovifify if ->NoSuchStash::SUPER::method */
1057 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
1058 if (stash) flags |= GV_SUPER;
1059 }
e189a56d 1060 else {
af09ea45 1061 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1062 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 1063 }
0dae17bd 1064 ostash = stash;
4633a7c4
LW		 1065 }
1066
14d1dfbd 1067 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1068 if (!gv) {
2f6e0fe7 1069 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1070 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1071 else if (autoload)
c8416c26
BF		 1072 gv = gv_autoload_pvn(
1073 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1074 );
256d1bb2
NC		 1075 if (!gv && do_croak) {
1076 /* Right now this is exclusively for the benefit of S_method_common
1077 in pp_hot.c */
1078 if (stash) {
15e6cdd9
DG		 1079 /* If we can't find an IO::File method, it might be a call on
1080 * a filehandle. If IO:File has not been loaded, try to
1081 * require it first instead of croaking */
1082 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1083 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1084 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1085 STR_WITH_LEN("IO/File.pm"), 0,
1086 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1087 ) {
31b05a0f 1088 require_pv("IO/File.pm");
14d1dfbd 1089 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG		 1090 if (gv)
1091 return gv;
1092 }
256d1bb2 1093 Perl_croak(aTHX_
b17a0679 1094 "Can't locate object method \"%"UTF8f
d0c0e7dd 1095 "\" via package \"%"HEKf"\"",
b17a0679 1096 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1097 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1098 }
1099 else {
ecad31f0 1100 SV* packnamesv;
256d1bb2 1101
256d1bb2 1102 if (nsplit) {
ecad31f0
BF		 1103 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1104 SVs_TEMP | is_utf8);
256d1bb2 1105 } else {
017c5e4e 1106 packnamesv = error_report;
256d1bb2
NC		 1107 }
1108
1109 Perl_croak(aTHX_
b17a0679
FC		 1110 "Can't locate object method \"%"UTF8f
1111 "\" via package \"%"SVf"\""
ecad31f0 1112 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1113 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1114 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1115 }
1116 }
463ee0b2 1117 }
dc848c6f 1118 else if (autoload) {
9d4ba2ae 1119 CV* const cv = GvCV(gv);
09280a33
CS		 1120 if (!CvROOT(cv) && !CvXSUB(cv)) {
1121 GV* stubgv;
1122 GV* autogv;
1123
0c028dca 1124 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS		 1125 stubgv = gv;
1126 else {
1127 stubgv = CvGV(cv);
1128 if (GvCV(stubgv) != cv) /* orphaned import */
1129 stubgv = gv;
1130 }
c8416c26
BF		 1131 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1132 GvNAME(stubgv), GvNAMELEN(stubgv),
1133 GV_AUTOLOAD_ISMETHOD
1134 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1135 if (autogv)
1136 gv = autogv;
1137 }
1138 }
44a8e56a 1139
1140 return gv;
1141}
1142
1143GV*
0eeb01b9 1144Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1145{
1146 char *namepv;
1147 STRLEN namelen;
0fe84f7c 1148 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1149 namepv = SvPV(namesv, namelen);
1150 if (SvUTF8(namesv))
1151 flags |= SVf_UTF8;
0eeb01b9 1152 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1153}
1154
1155GV*
0eeb01b9 1156Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1157{
0fe84f7c 1158 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1159 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1160}
1161
1162GV*
0eeb01b9 1163Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1164{
44a8e56a 1165 GV* gv;
1166 CV* cv;
1167 HV* varstash;
1168 GV* vargv;
1169 SV* varsv;
c8416c26
BF		 1170 SV *packname = NULL;
1171 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1172
0fe84f7c 1173 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1174
7edbdc6b 1175 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1176 return NULL;
0dae17bd
GS		 1177 if (stash) {
1178 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1179 STRLEN packname_len = 0;
1180 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1181 packname = newSVpvn_flags(packname_ptr, packname_len,
1182 SVs_TEMP | SvUTF8(stash));
5c284bb0 1183 stash = NULL;
0dae17bd 1184 }
c8416c26
BF		 1185 else
1186 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1187 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1188 }
257dc59d
FC		 1189 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1190 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1191 return NULL;
dc848c6f 1192 cv = GvCV(gv);
1193
adb5a9ae 1194 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1195 return NULL;
ed850460 1196
dc848c6f 1197 /*
1198 * Inheriting AUTOLOAD for non-methods works ... for now.
1199 */
0eeb01b9
FC		 1200 if (
1201 !(flags & GV_AUTOLOAD_ISMETHOD)
1202 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1203 )
d1d15184 1204 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC		 1205 "Use of inherited AUTOLOAD for non-method %"SVf
1206 "::%"UTF8f"() is deprecated",
ecad31f0 1207 SVfARG(packname),
b17a0679 1208 UTF8fARG(is_utf8, len, name));
44a8e56a 1209
aed2304a 1210 if (CvISXSUB(cv)) {
bb619f37
FC		 1211 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1212 * and split that value on the last '::', pass along the same data
1213 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1214 *
1215 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1216 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1217 * type. Since SvPVX has been documented as returning the sub name
1218 * for a long time, but not as returning the prototype, we have
1219 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1220 * elsewhere.
1221 *
1222 * We put the prototype in the same allocated buffer, but after
1223 * the sub name. The SvPOK flag indicates the presence of a proto-
1224 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1225 * If both flags are on, then SvLEN is used to indicate the end of
1226 * the prototype (artificially lower than what is actually allo-
1227 * cated), at the risk of having to reallocate a few bytes unneces-
1228 * sarily--but that should happen very rarely, if ever.
1229 *
1230 * We use SvUTF8 for both prototypes and sub names, so if one is
1231 * UTF8, the other must be upgraded.
adb5a9ae 1232 */
c68d9564 1233 CvSTASH_set(cv, stash);
8fa6a409 1234 if (SvPOK(cv)) { /* Ouch! */
e7881358 1235 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1236 STRLEN ulen;
1237 const char *proto = CvPROTO(cv);
1238 assert(proto);
1239 if (SvUTF8(cv))
1240 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1241 ulen = SvCUR(tmpsv);
1242 SvCUR(tmpsv)++; /* include null in string */
1243 sv_catpvn_flags(
1244 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1245 );
1246 SvTEMP_on(tmpsv); /* Allow theft */
1247 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1248 SvTEMP_off(tmpsv);
e7881358 1249 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1250 SvLEN(cv) = SvCUR(cv) + 1;
1251 SvCUR(cv) = ulen;
1252 }
1253 else {
1254 sv_setpvn((SV *)cv, name, len);
1255 SvPOK_off(cv);
1256 if (is_utf8)
c8416c26 1257 SvUTF8_on(cv);
8fa6a409
FC		 1258 else SvUTF8_off(cv);
1259 }
1260 CvAUTOLOAD_on(cv);
adb5a9ae 1261 }
adb5a9ae 1262
44a8e56a 1263 /*
1264 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1265 * The subroutine's original name may not be "AUTOLOAD", so we don't
1266 * use that, but for lack of anything better we will use the sub's
1267 * original package to look up $AUTOLOAD.
1268 */
18691622 1269 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1270 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1271 ENTER;
1272
c69033f2 1273 if (!isGV(vargv)) {
04ec7e59 1274 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1275#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1276 GvSV(vargv) = newSV(0);
c69033f2
NC		 1277#endif
1278 }
3d35f11b 1279 LEAVE;
e203899d 1280 varsv = GvSVn(vargv);
4bac9ae4
CS		 1281 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1282 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1283 sv_setsv(varsv, packname);
396482e1 1284 sv_catpvs(varsv, "::");
d40bf27b
NC		 1285 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1286 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1287 sv_catpvn_flags(
1288 varsv, name, len,
5bcd1ef4 1289 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1290 );
c8416c26
BF		 1291 if (is_utf8)
1292 SvUTF8_on(varsv);
a0d0e21e
LW		 1293 return gv;
1294}
1295
44a2ac75
YO		 1296
1297/* require_tie_mod() internal routine for requiring a module
486ec47a 1298 * that implements the logic of automatic ties like %! and %-
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.
44a2ac75 1303 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1304 * are working reasonably close to as expected.
1305 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1306 * For the protection of $! to work (it is set by this routine)
1307 * the sv slot must already be magicalized.
d2c93421 1308 */
44a2ac75
YO		 1309STATIC HV*
1310S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1311{
da51bb9b 1312 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1313
7918f24d
NC		 1314 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1315
0ea03996 1316 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1317 SV *module = newSVsv(namesv);
1318 char varname = *varpv; /* varpv might be clobbered by load_module,
1319 so save it. For the moment it's always
1320 a single char. */
b82b06b8 1321 const char type = varname == '[' ? '$' : '%';
61bac25c 1322#ifdef DEBUGGING
d2c93421 1323 dSP;
61bac25c 1324#endif
d2c93421 1325 ENTER;
600beb2e 1326 SAVEFREESV(namesv);
44a2ac75 1327 if ( flags & 1 )
45cbc99a
RGS		 1328 save_scalar(gv);
1329 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1330 assert(sp == PL_stack_sp);
da51bb9b 1331 stash = gv_stashsv(namesv, 0);
44a2ac75 1332 if (!stash)
b82b06b8
FC		 1333 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1334 type, varname, SVfARG(namesv));
45cbc99a 1335 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1336 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1337 type, varname, SVfARG(namesv), methpv);
600beb2e 1338 LEAVE;
d2c93421 1339 }
e7881358 1340 else SvREFCNT_dec_NN(namesv);
44a2ac75 1341 return stash;
d2c93421
RH		 1342}
1343
954c1994
GS		 1344/*
1345=for apidoc gv_stashpv
1346
da51bb9b 1347Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1348determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1349
1350=cut
1351*/
1352
a0d0e21e 1353HV*
864dbfa3 1354Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1355{
7918f24d 1356 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1357 return gv_stashpvn(name, strlen(name), create);
1358}
1359
bc96cb06
SH		 1360/*
1361=for apidoc gv_stashpvn
1362
da51bb9b
NC		 1363Returns a pointer to the stash for a specified package. The C<namelen>
1364parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1365to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1366created if it does not already exist. If the package does not exist and
796b6530 1367C<flags> is 0 (or any other setting that does not create packages) then C<NULL>
da51bb9b
NC		 1368is returned.
1369
566a4718
YO		 1370Flags may be one of:
1371
1372 GV_ADD
1373 SVf_UTF8
1374 GV_NOADD_NOINIT
1375 GV_NOINIT
1376 GV_NOEXPAND
1377 GV_ADDMG
1378
796b6530 1379The most important of which are probably C<GV_ADD> and C<SVf_UTF8>.
bc96cb06 1380
808724c8 1381Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1382recommended for performance reasons.
1383
bc96cb06
SH		 1384=cut
1385*/
1386
0eadbdad
YO		 1387/*
1388gv_stashpvn_internal
1389
1390Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1391as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1392
1393*/
1394
4e7ebec5 1395PERL_STATIC_INLINE HV*
0eadbdad 1396S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1397{
0cea0058 1398 char smallbuf[128];
46fc3d4c 1399 char *tmpbuf;
a0d0e21e
LW		 1400 HV *stash;
1401 GV *tmpgv;
add0ecde 1402 U32 tmplen = namelen + 2;
dc437b57 1403
0eadbdad 1404 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1405
add0ecde 1406 if (tmplen <= sizeof smallbuf)
46fc3d4c 1407 tmpbuf = smallbuf;
1408 else
add0ecde
VP		 1409 Newx(tmpbuf, tmplen, char);
1410 Copy(name, tmpbuf, namelen, char);
1411 tmpbuf[namelen] = ':';
1412 tmpbuf[namelen+1] = ':';
1413 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1414 if (tmpbuf != smallbuf)
1415 Safefree(tmpbuf);
d2fcb1d6 1416 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1417 return NULL;
a0d0e21e 1418 stash = GvHV(tmpgv);
1f656fcf 1419 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1420 assert(stash);
1f656fcf 1421 if (!HvNAME_get(stash)) {
0be4d16f 1422 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1423
1424 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1425 /* If the containing stash has multiple effective
1426 names, see that this one gets them, too. */
1427 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1428 mro_package_moved(stash, NULL, tmpgv, 1);
1429 }
a0d0e21e 1430 return stash;
463ee0b2
LW		 1431}
1432
808724c8 1433/*
1434gv_stashsvpvn_cached
1435
1436Returns a pointer to the stash for a specified package, possibly
1437cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1438
1439Requires one of either namesv or namepv to be non-null.
1440
fbe13c60 1441See C<L</gv_stashpvn>> for details on "flags".
808724c8 1442
1443Note the sv interface is strongly preferred for performance reasons.
1444
1445*/
1446
1447#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1448 assert(namesv || name)
1449
1450PERL_STATIC_INLINE HV*
1451S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1452{
1453 HV* stash;
808724c8 1454 HE* he;
1455
1456 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1457
1458 he = (HE *)hv_common(
1459 PL_stashcache, namesv, name, namelen,
4e7ebec5 1460 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1461 );
808724c8 1462
4e7ebec5 1463 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1464 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1465
808724c8 1466 if (namesv) {
1467 if (SvOK(namesv)) { /* prevent double uninit warning */
1468 STRLEN len;
1469 name = SvPV_const(namesv, len);
1470 namelen = len;
1471 flags |= SvUTF8(namesv);
1472 } else {
1473 name = ""; namelen = 0;
1474 }
1475 }
0eadbdad
YO		 1476 stash = gv_stashpvn_internal(name, namelen, flags);
1477
4e7ebec5 1478 if (stash && namelen) {
1479 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1480 (void)hv_store(PL_stashcache, name,
4e7ebec5 1481 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1482 }
808724c8 1483
4e7ebec5 1484 return stash;
1485}
1486
808724c8 1487HV*
1488Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1489{
1490 PERL_ARGS_ASSERT_GV_STASHPVN;
1491 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1492}
1493
954c1994
GS		 1494/*
1495=for apidoc gv_stashsv
1496
fbe13c60
KW		 1497Returns a pointer to the stash for a specified package. See
1498C<L</gv_stashpvn>>.
954c1994 1499
fbe13c60
KW		 1500Note this interface is strongly preferred over C<gv_stashpvn> for performance
1501reasons.
808724c8 1502
954c1994
GS		 1503=cut
1504*/
1505
a0d0e21e 1506HV*
da51bb9b 1507Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1508{
7918f24d 1509 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1510 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW		 1511}
1512
1513
463ee0b2 1514GV *
fe9845cc 1515Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1516 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1517 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1518}
1519
1520GV *
fe9845cc 1521Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1522 STRLEN len;
77cb3b01
FC		 1523 const char * const nambeg =
1524 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1525 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1526 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1527}
1528
90aeefb4 1529PERL_STATIC_INLINE void
290a1700 1530S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1531{
1532 AV* av;
1533
1534 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1535
1536 av = GvAVn(gv);
1537 GvMULTI_on(gv);
1538 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1539 NULL, 0);
ad7cce9f
FR		 1540}
1541
90aeefb4
BF		 1542/* This function grabs name and tries to split a stash and glob
1543 * from its contents. TODO better description, comments
1544 *
1545 * If the function returns TRUE and 'name == name_end', then
1546 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1547 */
1548PERL_STATIC_INLINE bool
1549S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1550 STRLEN *len, const char *nambeg, STRLEN full_len,
1551 const U32 is_utf8, const I32 add)
1552{
1553 const char *name_cursor;
1554 const char *const name_end = nambeg + full_len;
1555 const char *const name_em1 = name_end - 1;
1556
1557 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1558
1559 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1560 /* accidental stringify on a GV? */
1561 (*name)++;
1562 }
1563
1564 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1565 if (name_cursor < name_em1 &&
1566 ((*name_cursor == ':' && name_cursor[1] == ':')
1567 || *name_cursor == '\''))
1568 {
1569 if (!*stash)
1570 *stash = PL_defstash;
1571 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1572 return FALSE;
1573
1574 *len = name_cursor - *name;
1575 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1576 const char *key;
1577 GV**gvp;
1578 if (*name_cursor == ':') {
1579 key = *name;
1580 *len += 2;
1581 }
1582 else {
1583 char *tmpbuf;
1584 Newx(tmpbuf, *len+2, char);
1585 Copy(*name, tmpbuf, *len, char);
1586 tmpbuf[(*len)++] = ':';
1587 tmpbuf[(*len)++] = ':';
1588 key = tmpbuf;
1589 }
c161da64 1590 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF		 1591 *gv = gvp ? *gvp : NULL;
1592 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1593 if (SvTYPE(*gv) != SVt_PVGV)
1594 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1595 else
1596 GvMULTI_on(*gv);
1597 }
1598 if (key != *name)
1599 Safefree(key);
1600 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1601 return FALSE;
1602
1603 if (!(*stash = GvHV(*gv))) {
1604 *stash = GvHV(*gv) = newHV();
1605 if (!HvNAME_get(*stash)) {
1606 if (GvSTASH(*gv) == PL_defstash && *len == 6
1607 && strnEQ(*name, "CORE", 4))
1608 hv_name_set(*stash, "CORE", 4, 0);
1609 else
1610 hv_name_set(
1611 *stash, nambeg, name_cursor-nambeg, is_utf8
1612 );
1613 /* If the containing stash has multiple effective
1614 names, see that this one gets them, too. */
1615 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1616 mro_package_moved(*stash, NULL, *gv, 1);
1617 }
1618 }
1619 else if (!HvNAME_get(*stash))
1620 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1621 }
1622
1623 if (*name_cursor == ':')
1624 name_cursor++;
1625 *name = name_cursor+1;
1626 if (*name == name_end) {
1627 if (!*gv)
1628 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1629 return TRUE;
1630 }
1631 }
1632 }
1633 *len = name_cursor - *name;
1634 return TRUE;
1635}
1636
536d1a88 1637/* Checks if an unqualified name is in the main stash */
90aeefb4 1638PERL_STATIC_INLINE bool
536d1a88 1639S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1640{
536d1a88 1641 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1642
90aeefb4 1643 /* If it's an alphanumeric variable */
536d1a88 1644 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF		 1645 /* Some "normal" variables are always in main::,
1646 * like INC or STDOUT.
1647 */
1648 switch (len) {
1649 case 1:
1650 if (*name == '_')
536d1a88 1651 return TRUE;
90aeefb4
BF		 1652 break;
1653 case 3:
1654 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1655 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1656 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1657 return TRUE;
90aeefb4
BF		 1658 break;
1659 case 4:
1660 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1661 && name[3] == 'V')
536d1a88 1662 return TRUE;
90aeefb4
BF		 1663 break;
1664 case 5:
1665 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1666 && name[3] == 'I' && name[4] == 'N')
536d1a88 1667 return TRUE;
90aeefb4
BF		 1668 break;
1669 case 6:
1670 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1671 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1672 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1673 return TRUE;
90aeefb4
BF		 1674 break;
1675 case 7:
1676 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1677 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1678 && name[6] == 'T')
536d1a88 1679 return TRUE;
90aeefb4
BF		 1680 break;
1681 }
536d1a88
BF		 1682 }
1683 /* *{""}, or a special variable like $@ */
1684 else
1685 return TRUE;
1686
1687 return FALSE;
1688}
1689
1690
1691/* This function is called if parse_gv_stash_name() failed to
1692 * find a stash, or if GV_NOTQUAL or an empty name was passed
1693 * to gv_fetchpvn_flags.
1694 *
1695 * It returns FALSE if the default stash can't be found nor created,
1696 * which might happen during global destruction.
1697 */
1698PERL_STATIC_INLINE bool
1699S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1700 const U32 is_utf8, const I32 add,
1701 const svtype sv_type)
1702{
1703 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1704
1705 /* No stash in name, so see how we can default */
90aeefb4 1706
536d1a88
BF		 1707 if ( gv_is_in_main(name, len, is_utf8) ) {
1708 *stash = PL_defstash;
1709 }
1710 else {
1711 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1712 *stash = PL_curstash;
1713 if (add && (PL_hints & HINT_STRICT_VARS) &&
1714 sv_type != SVt_PVCV &&
1715 sv_type != SVt_PVGV &&
1716 sv_type != SVt_PVFM &&
1717 sv_type != SVt_PVIO &&
1718 !(len == 1 && sv_type == SVt_PV &&
1719 (*name == 'a' || *name == 'b')) )
1720 {
c161da64 1721 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1722 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1723 SvTYPE(*gvp) != SVt_PVGV)
1724 {
1725 *stash = NULL;
1726 }
1727 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1728 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1729 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1730 {
1731 /* diag_listed_as: Variable "%s" is not imported%s */
1732 Perl_ck_warner_d(
1733 aTHX_ packWARN(WARN_MISC),
1734 "Variable \"%c%"UTF8f"\" is not imported",
1735 sv_type == SVt_PVAV ? '@' :
1736 sv_type == SVt_PVHV ? '%' : '$',
1737 UTF8fARG(is_utf8, len, name));
1738 if (GvCVu(*gvp))
1739 Perl_ck_warner_d(
1740 aTHX_ packWARN(WARN_MISC),
1741 "\t(Did you mean &%"UTF8f" instead?)\n",
1742 UTF8fARG(is_utf8, len, name)
1743 );
1744 *stash = NULL;
1745 }
1746 }
1747 }
1748 else {
1749 /* Use the current op's stash */
1750 *stash = CopSTASH(PL_curcop);
1751 }
1752 }
90aeefb4
BF		 1753
1754 if (!*stash) {
1755 if (add && !PL_in_clean_all) {
10860bf4
FC		 1756 GV *gv;
1757 qerror(Perl_mess(aTHX_
90aeefb4 1758 "Global symbol \"%s%"UTF8f
d8c6310a
FC		 1759 "\" requires explicit package name (did you forget to "
1760 "declare \"my %s%"UTF8f"\"?)",
1761 (sv_type == SVt_PV ? "$"
1762 : sv_type == SVt_PVAV ? "@"
1763 : sv_type == SVt_PVHV ? "%"
1764 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF		 1765 (sv_type == SVt_PV ? "$"
1766 : sv_type == SVt_PVAV ? "@"
1767 : sv_type == SVt_PVHV ? "%"
10860bf4 1768 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF		 1769 /* To maintain the output of errors after the strict exception
1770 * above, and to keep compat with older releases, rather than
1771 * placing the variables in the pad, we place
1772 * them in the <none>:: stash.
1773 */
90aeefb4
BF		 1774 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1775 if (!gv) {
1776 /* symbol table under destruction */
1777 return FALSE;
1778 }
1779 *stash = GvHV(gv);
1780 }
1781 else
1782 return FALSE;
1783 }
1784
1785 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1786 return FALSE;
1787
1788 return TRUE;
1789}
1790
8c995aba
FC		 1791/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1792 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1793 this file. */
1794#undef SvREADONLY_on
1795#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1796
930867a8
BF		 1797/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1798 * a new GV.
1799 * Note that it does not insert the GV into the stash prior to
1800 * magicalization, which some variables require need in order
1801 * to work (like $[, %+, %-, %!), so callers must take care of
1802 * that beforehand.
1803 *
1804 * The return value has a specific meaning for gv_fetchpvn_flags:
1805 * If it returns true, and the gv is empty, it indicates that its
1806 * refcount should be decreased.
1807 */
1808PERL_STATIC_INLINE bool
1809S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1810 bool addmg, const svtype sv_type)
79072805 1811{
960b831f 1812 SSize_t paren;
79072805 1813
930867a8 1814 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1815
44428a46 1816 if (stash != PL_defstash) { /* not the main stash */
ea238638 1817 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1818 and VERSION. All the others apply only to the main stash or to
1819 CORE (which is checked right after this). */
ea238638 1820 if (len) {
b464bac0 1821 const char * const name2 = name + 1;
cc4c2da6 1822 switch (*name) {
cc4c2da6
NC		 1823 case 'E':
1824 if (strnEQ(name2, "XPORT", 5))
1825 GvMULTI_on(gv);
1826 break;
1827 case 'I':
44428a46 1828 if (strEQ(name2, "SA"))
290a1700 1829 gv_magicalize_isa(gv);
cc4c2da6 1830 break;
44428a46
FC		 1831 case 'V':
1832 if (strEQ(name2, "ERSION"))
1833 GvMULTI_on(gv);
1834 break;
ea238638
FC		 1835 case 'a':
1836 case 'b':
1837 if (len == 1 && sv_type == SVt_PV)
1838 GvMULTI_on(gv);
924ba076 1839 /* FALLTHROUGH */
4aaa4757
FC		 1840 default:
1841 goto try_core;
1842 }
930867a8 1843 return addmg;
4aaa4757
FC		 1844 }
1845 try_core:
1846 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1847 /* Avoid null warning: */
1848 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1849 if (strnEQ(stashname, "CORE", 4))
1850 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1851 }
1852 }
1853 else if (len > 1) {
1854#ifndef EBCDIC
1855 if (*name > 'V' ) {
1856 NOOP;
1857 /* Nothing else to do.
1858 The compiler will probably turn the switch statement into a
1859 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1860 the common case of lower case variable names. (On EBCDIC
1861 platforms, we can't just do:
1862 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1863 because cases like '\027' in the switch statement below are
1864 C1 (non-ASCII) controls on those platforms, so the remapping
1865 would make them larger than 'V')
1866 */
44428a46
FC		 1867 } else
1868#endif
1869 {
3e669301 1870 const char * name2 = name + 1;
44428a46
FC		 1871 switch (*name) {
1872 case 'A':
1873 if (strEQ(name2, "RGV")) {
1874 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1875 }
1876 else if (strEQ(name2, "RGVOUT")) {
1877 GvMULTI_on(gv);
1878 }
1879 break;
1880 case 'E':
1881 if (strnEQ(name2, "XPORT", 5))
1882 GvMULTI_on(gv);
1883 break;
1884 case 'I':
1885 if (strEQ(name2, "SA")) {
290a1700 1886 gv_magicalize_isa(gv);
44428a46
FC		 1887 }
1888 break;
cc4c2da6
NC		 1889 case 'S':
1890 if (strEQ(name2, "IG")) {
1891 HV *hv;
1892 I32 i;
d525a7b2
NC		 1893 if (!PL_psig_name) {
1894 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1895 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1896 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1897 } else {
1898 /* I think that the only way to get here is to re-use an
1899 embedded perl interpreter, where the previous
1900 use didn't clean up fully because
1901 PL_perl_destruct_level was 0. I'm not sure that we
1902 "support" that, in that I suspect in that scenario
1903 there are sufficient other garbage values left in the
1904 interpreter structure that something else will crash
1905 before we get here. I suspect that this is one of
1906 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1907 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1908 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1909 }
1910 GvMULTI_on(gv);
1911 hv = GvHVn(gv);
a0714e2c 1912 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1913 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1914 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1915 if (init)
1916 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1917 }
1918 }
1919 break;
1920 case 'V':
1921 if (strEQ(name2, "ERSION"))
1922 GvMULTI_on(gv);
1923 break;
e5218da5
GA		 1924 case '\003': /* $^CHILD_ERROR_NATIVE */
1925 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1926 goto magicalize;
1927 break;
cc4c2da6 1928 case '\005': /* $^ENCODING */
3e669301
KW		 1929 if (*name2 == '_') {
1930 name2++;
1931 }
cc4c2da6
NC		 1932 if (strEQ(name2, "NCODING"))
1933 goto magicalize;
1934 break;
9ebf26ad
FR		 1935 case '\007': /* $^GLOBAL_PHASE */
1936 if (strEQ(name2, "LOBAL_PHASE"))
1937 goto ro_magicalize;
1938 break;
8561ea1d
FC		 1939 case '\014': /* $^LAST_FH */
1940 if (strEQ(name2, "AST_FH"))
1941 goto ro_magicalize;
1942 break;
cde0cee5 1943 case '\015': /* $^MATCH */
960b831f
NC		 1944 if (strEQ(name2, "ATCH")) {
1945 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1946 goto storeparen;
1947 }
66230c86 1948 break;
cc4c2da6
NC		 1949 case '\017': /* $^OPEN */
1950 if (strEQ(name2, "PEN"))
1951 goto magicalize;
1952 break;
cde0cee5 1953 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC		 1954 if (strEQ(name2, "REMATCH")) {
1955 paren = RX_BUFF_IDX_CARET_PREMATCH;
1956 goto storeparen;
1957 }
1958 if (strEQ(name2, "OSTMATCH")) {
1959 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1960 goto storeparen;
1961 }
9ebf26ad 1962 break;
cc4c2da6
NC		 1963 case '\024': /* ${^TAINT} */
1964 if (strEQ(name2, "AINT"))
1965 goto ro_magicalize;
1966 break;
7cebcbc0 1967 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1968 if (strEQ(name2, "NICODE"))
cc4c2da6 1969 goto ro_magicalize;
a0288114 1970 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1971 goto ro_magicalize;
e07ea26a
NC		 1972 if (strEQ(name2, "TF8CACHE"))
1973 goto magicalize;
cc4c2da6
NC		 1974 break;
1975 case '\027': /* $^WARNING_BITS */
1976 if (strEQ(name2, "ARNING_BITS"))
1977 goto magicalize;
1978 break;
1979 case '1':
1980 case '2':
1981 case '3':
1982 case '4':
1983 case '5':
1984 case '6':
1985 case '7':
1986 case '8':
1987 case '9':
85e6fe83 1988 {
2fdbfb4d
AB		 1989 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1990 this test */
22ff3130
HS		 1991 UV uv;
1992 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1993 return addmg;
1994 /* XXX why are we using a SSize_t? */
1995 paren = (SSize_t)(I32)uv;
960b831f 1996 goto storeparen;
1d7c1841 1997 }
dc437b57 1998 }
93a17b20 1999 }
392db708
NC		 2000 } else {
2001 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2002 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2003 switch (*name) {
6361f656 2004 case '&': /* $& */
960b831f
NC		 2005 paren = RX_BUFF_IDX_FULLMATCH;
2006 goto sawampersand;
6361f656 2007 case '`': /* $` */
960b831f
NC		 2008 paren = RX_BUFF_IDX_PREMATCH;
2009 goto sawampersand;
6361f656 2010 case '\'': /* $' */
960b831f
NC		 2011 paren = RX_BUFF_IDX_POSTMATCH;
2012 sawampersand:
1a904fc8 2013#ifdef PERL_SAWAMPERSAND
a289ef89 2014 if (!(
cc4c2da6
NC		 2015 sv_type == SVt_PVAV ||
2016 sv_type == SVt_PVHV ||
2017 sv_type == SVt_PVCV ||
2018 sv_type == SVt_PVFM ||
2019 sv_type == SVt_PVIO
d3b97530
DM		 2020 )) { PL_sawampersand |=
2021 (*name == '`')
2022 ? SAWAMPERSAND_LEFT
2023 : (*name == '&')
2024 ? SAWAMPERSAND_MIDDLE
2025 : SAWAMPERSAND_RIGHT;
2026 }
1a904fc8 2027#endif
960b831f 2028 goto storeparen;
e91d8259
NC		 2029 case '1': /* $1 */
2030 case '2': /* $2 */
2031 case '3': /* $3 */
2032 case '4': /* $4 */
2033 case '5': /* $5 */
2034 case '6': /* $6 */
2035 case '7': /* $7 */
2036 case '8': /* $8 */
2037 case '9': /* $9 */
960b831f
NC		 2038 paren = *name - '0';
2039
2040 storeparen:
e91d8259
NC		 2041 /* Flag the capture variables with a NULL mg_ptr
2042 Use mg_len for the array index to lookup. */
960b831f 2043 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2044 break;
cc4c2da6 2045
6361f656 2046 case ':': /* $: */
c69033f2 2047 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 2048 goto magicalize;
2049
6361f656 2050 case '?': /* $? */
ff0cee69 2051#ifdef COMPLEX_STATUS
c69033f2 2052 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2053#endif
cc4c2da6 2054 goto magicalize;
ff0cee69 2055
6361f656 2056 case '!': /* $! */
67261566 2057 GvMULTI_on(gv);
44a2ac75 2058 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2059
ad64d0ec 2060 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2061
44a2ac75 2062 /* magicalization must be done before require_tie_mod is called */
67261566 2063 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 2064 {
44a2ac75 2065 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 2066 addmg = FALSE;
ffdb8bcd 2067 }
d2c93421 2068
6cef1e77 2069 break;
6361f656
AB		 2070 case '-': /* $- */
2071 case '+': /* $+ */
44a2ac75
YO		 2072 GvMULTI_on(gv); /* no used once warnings here */
2073 {
44a2ac75 2074 AV* const av = GvAVn(gv);
ad64d0ec 2075 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2076
ad64d0ec
NC		 2077 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2078 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2079 if (avc)
44a2ac75 2080 SvREADONLY_on(GvSVn(gv));
44a2ac75 2081 SvREADONLY_on(av);
67261566
YO		 2082
2083 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 2084 {
192b9cd1 2085 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 2086 addmg = FALSE;
213084e4 2087 }
67261566 2088
80305961 2089 break;
cc4c2da6 2090 }
6361f656
AB		 2091 case '*': /* $* */
2092 case '#': /* $# */
9b387841 2093 if (sv_type == SVt_PV)
4f650b80 2094 /* diag_listed_as: $* is no longer supported */
9b387841 2095 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2096 "$%c is no longer supported", *name);
8ae1fe26 2097 break;
b3ca2e83
NC		 2098 case '\010': /* $^H */
2099 {
2100 HV *const hv = GvHVn(gv);
2101 hv_magic(hv, NULL, PERL_MAGIC_hints);
2102 }
2103 goto magicalize;
b82b06b8 2104 case '[': /* $[ */
7d69d4a6 2105 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2106 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 2107 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 2108 addmg = FALSE;
b82b06b8 2109 }
7d69d4a6 2110 else goto magicalize;
b82b06b8 2111 break;
cc4c2da6 2112 case '\023': /* $^S */
2fdbfb4d
AB		 2113 ro_magicalize:
2114 SvREADONLY_on(GvSVn(gv));
924ba076 2115 /* FALLTHROUGH */
6361f656 2116 case '0': /* $0 */
6361f656
AB		 2117 case '^': /* $^ */
2118 case '~': /* $~ */
2119 case '=': /* $= */
2120 case '%': /* $% */
2121 case '.': /* $. */
2122 case '(': /* $( */
2123 case ')': /* $) */
2124 case '<': /* $< */
2125 case '>': /* $> */
2126 case '\\': /* $\ */
2127 case '/': /* $/ */
4505a31f 2128 case '|': /* $| */
9cdac2a2 2129 case '$': /* $$ */
cc4c2da6
NC		 2130 case '\001': /* $^A */
2131 case '\003': /* $^C */
2132 case '\004': /* $^D */
2133 case '\005': /* $^E */
2134 case '\006': /* $^F */
cc4c2da6
NC		 2135 case '\011': /* $^I, NOT \t in EBCDIC */
2136 case '\016': /* $^N */
2137 case '\017': /* $^O */
2138 case '\020': /* $^P */
2139 case '\024': /* $^T */
2140 case '\027': /* $^W */
2141 magicalize:
ad64d0ec 2142 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2143 break;
e521374c 2144
cc4c2da6 2145 case '\014': /* $^L */
76f68e9b 2146 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2147 break;
6361f656 2148 case ';': /* $; */
76f68e9b 2149 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2150 break;
6361f656 2151 case ']': /* $] */
cc4c2da6 2152 {
3638bf15 2153 SV * const sv = GvSV(gv);
d7aa5382 2154 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2155 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2156 GvSV(gv) = vnumify(PL_patchlevel);
2157 SvREADONLY_on(GvSV(gv));
2158 SvREFCNT_dec(sv);
93a17b20
LW		 2159 }
2160 break;
cc4c2da6
NC		 2161 case '\026': /* $^V */
2162 {
3638bf15 2163 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2164 GvSV(gv) = new_version(PL_patchlevel);
2165 SvREADONLY_on(GvSV(gv));
2166 SvREFCNT_dec(sv);
16070b82
GS		 2167 }
2168 break;
ea238638
FC		 2169 case 'a':
2170 case 'b':
dc3e91f6 2171 if (sv_type == SVt_PV)
ea238638 2172 GvMULTI_on(gv);
cc4c2da6 2173 }
79072805 2174 }
930867a8
BF		 2175
2176 return addmg;
71c35c05
BF		 2177}
2178
8c995aba
FC		 2179/* If we do ever start using this later on in the file, we need to make
2180 sure we don’t accidentally use the wrong definition. */
2181#undef SvREADONLY_on
2182
070dc475
BF		 2183/* This function is called when the stash already holds the GV of the magic
2184 * variable we're looking for, but we need to check that it has the correct
2185 * kind of magic. For example, if someone first uses $! and then %!, the
2186 * latter would end up here, and we add the Errno tie to the HASH slot of
2187 * the *! glob.
2188 */
2189PERL_STATIC_INLINE void
2190S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2191{
2192 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2193
2194 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2195 if (*name == '!')
2196 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2197 else if (*name == '-' || *name == '+')
2198 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2199 } else if (sv_type == SVt_PV) {
2200 if (*name == '*' || *name == '#') {
2201 /* diag_listed_as: $* is no longer supported */
2202 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2203 WARN_SYNTAX),
2204 "$%c is no longer supported", *name);
2205 }
2206 }
2207 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2208 switch (*name) {
2209 case '[':
2210 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2211 break;
2212#ifdef PERL_SAWAMPERSAND
2213 case '`':
2214 PL_sawampersand |= SAWAMPERSAND_LEFT;
2215 (void)GvSVn(gv);
2216 break;
2217 case '&':
2218 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2219 (void)GvSVn(gv);
2220 break;
2221 case '\'':
2222 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2223 (void)GvSVn(gv);
2224 break;
2225#endif
2226 }
2227 }
2228}
2229
71c35c05
BF		 2230GV *
2231Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2232 const svtype sv_type)
2233{
71c35c05
BF		 2234 const char *name = nambeg;
2235 GV *gv = NULL;
2236 GV**gvp;
2237 STRLEN len;
2238 HV *stash = NULL;
2239 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2240 const I32 no_expand = flags & GV_NOEXPAND;
2241 const I32 add = flags & ~GV_NOADD_MASK;
2242 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2243 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2244 const char *const name_end = nambeg + full_len;
2245 U32 faking_it;
2246
2247 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2248
2249 /* If we have GV_NOTQUAL, the caller promised that
2250 * there is no stash, so we can skip the check.
2251 * Similarly if full_len is 0, since then we're
2252 * dealing with something like *{""} or ""->foo()
2253 */
2254 if ((flags & GV_NOTQUAL) || !full_len) {
2255 len = full_len;
2256 }
2257 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2258 if (name == name_end) return gv;
2259 }
2260 else {
2261 return NULL;
2262 }
2263
2264 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2265 return NULL;
2266 }
2267
2268 /* By this point we should have a stash and a name */
c161da64 2269 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2270 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2271 if (addmg) gv = (GV *)newSV(0);
2272 else return NULL;
2273 }
2274 else gv = *gvp, addmg = 0;
2275 /* From this point on, addmg means gv has not been inserted in the
2276 symtab yet. */
2277
2278 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2279 /* The GV already exists, so return it, but check if we need to do
2280 * anything else with it before that.
2281 */
71c35c05 2282 if (add) {
c002ae9a
BF		 2283 /* This is the heuristic that handles if a variable triggers the
2284 * 'used only once' warning. If there's already a GV in the stash
2285 * with this name, then we assume that the variable has been used
2286 * before and turn its MULTI flag on.
2287 * It's a heuristic because it can easily be "tricked", like with
2288 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2289 * not warning about $main::foo being used just once
2290 */
71c35c05
BF		 2291 GvMULTI_on(gv);
2292 gv_init_svtype(gv, sv_type);
2293 /* You reach this path once the typeglob has already been created,
2294 either by the same or a different sigil. If this path didn't
2295 exist, then (say) referencing $! first, and %! second would
2296 mean that %! was not handled correctly. */
2297 if (len == 1 && stash == PL_defstash) {
070dc475 2298 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2299 }
2300 else if (len == 3 && sv_type == SVt_PVAV
2301 && strnEQ(name, "ISA", 3)
2302 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2303 gv_magicalize_isa(gv);
2304 }
2305 return gv;
2306 } else if (no_init) {
2307 assert(!addmg);
2308 return gv;
c002ae9a
BF		 2309 }
2310 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2311 * don't expand it to a glob. This is an optimization so that things
2312 * copying constants over, like Exporter, don't have to be rewritten
2313 * to take into account that you can store more than just globs in
2314 * stashes.
2315 */
2316 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2317 assert(!addmg);
2318 return gv;
2319 }
2320
2321 /* Adding a new symbol.
2322 Unless of course there was already something non-GV here, in which case
2323 we want to behave as if there was always a GV here, containing some sort
2324 of subroutine.
2325 Otherwise we run the risk of creating things like GvIO, which can cause
2326 subtle bugs. eg the one that tripped up SQL::Translator */
2327
2328 faking_it = SvOK(gv);
2329
2330 if (add & GV_ADDWARN)
2331 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2332 "Had to create %"UTF8f" unexpectedly",
2333 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2334 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2335
9e5de6ae 2336 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2337 GvMULTI_on(gv) ;
2338
930867a8
BF		 2339 /* First, store the gv in the symtab if we're adding magic,
2340 * but only for non-empty GVs
2341 */
2342#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2343 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2344
2345 if ( addmg && !GvEMPTY(gv) ) {
2346 (void)hv_store(stash,name,len,(SV *)gv,0);
2347 }
2348
71c35c05 2349 /* set up magic where warranted */
930867a8
BF		 2350 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2351 /* See 23496c6 */
2352 if (GvEMPTY(gv)) {
2353 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2354 /* The GV was and still is "empty", except that now
2355 * it has the magic flags turned on, so we want it
2356 * stored in the symtab.
2357 */
2358 (void)hv_store(stash,name,len,(SV *)gv,0);
2359 }
2360 else {
2361 /* Most likely the temporary GV created above */
2362 SvREFCNT_dec_NN(gv);
2363 gv = NULL;
2364 }
2365 }
2366 }
71c35c05 2367
e6066781 2368 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2369 return gv;
79072805
LW		 2370}
2371
2372void
35a4481c 2373Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2374{
ed60a868 2375 const char *name;
35a4481c 2376 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2377
2378 PERL_ARGS_ASSERT_GV_FULLNAME4;
2379
666ea192 2380 sv_setpv(sv, prefix ? prefix : "");
a0288114 2381
52a6327b 2382 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2383 const STRLEN len = HvNAMELEN(hv);
2384 if (keepmain || strnNE(name, "main", len)) {
2385 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2386 sv_catpvs(sv,"::");
ed60a868 2387 }
43693395 2388 }
ed60a868 2389 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2390 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2391}
2392
2393void
35a4481c 2394Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2395{
099be4f1 2396 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2397
2398 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2399
46c461b5 2400 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2401}
2402
39a65960
DM		 2403
2404/* recursively scan a stash and any nested stashes looking for entries
2405 * that need the "only used once" warning raised
2406 */
2407
79072805 2408void
51da40ed 2409Perl_gv_check(pTHX_ HV *stash)
79072805 2410{
eb578fdb 2411 I32 i;
463ee0b2 2412
7918f24d
NC		 2413 PERL_ARGS_ASSERT_GV_CHECK;
2414
8990e307
LW		 2415 if (!HvARRAY(stash))
2416 return;
90754377
DM		 2417
2418 assert(SvOOK(stash));
90754377 2419
a0d0e21e 2420 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2421 const HE *entry;
90754377 2422 /* mark stash is being scanned, to avoid recursing */
339441ef 2423 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2424 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2425 GV *gv;
b7787f18 2426 HV *hv;
dc437b57 2427 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2428 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2429 {
90754377
DM		 2430 if (hv != PL_defstash && hv != stash
2431 && !(SvOOK(hv)
2432 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2433 )
a0d0e21e
LW		 2434 gv_check(hv); /* nested package */
2435 }
ecad31f0
BF		 2436 else if ( *HeKEY(entry) != '_'
2437 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2438 const char *file;
159b6efe 2439 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2440 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2441 continue;
1d7c1841 2442 file = GvFILE(gv);
1d7c1841 2443 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2444#ifdef USE_ITHREADS
2445 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2446#else
2447 CopFILEGV(PL_curcop)
2448 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2449#endif
9014280d 2450 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2451 "Name \"%"HEKf"::%"HEKf
2452 "\" used only once: possible typo",
2453 HEKfARG(HvNAME_HEK(stash)),
2454 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2455 }
79072805 2456 }
339441ef 2457 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2458 }
2459}
2460
2461GV *
9cc50d5b 2462Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2463{
9cc50d5b 2464 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2465 assert(!(flags & ~SVf_UTF8));
7918f24d 2466
b17a0679
FC		 2467 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2468 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2469 (long)PL_gensym++),
2470 GV_ADD, SVt_PVGV);
79072805
LW		 2471}
2472
2473/* hopefully this is only called on local symbol table entries */
2474
2475GP*
864dbfa3 2476Perl_gp_ref(pTHX_ GP *gp)
79072805 2477{
1d7c1841 2478 if (!gp)
d4c19fe8 2479 return NULL;
79072805 2480 gp->gp_refcnt++;
44a8e56a 2481 if (gp->gp_cv) {
2482 if (gp->gp_cvgen) {
e1a479c5
BB		 2483 /* If the GP they asked for a reference to contains
2484 a method cache entry, clear it first, so that we
2485 don't infect them with our cached entry */
e7881358 2486 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2487 gp->gp_cv = NULL;
44a8e56a 2488 gp->gp_cvgen = 0;
2489 }
44a8e56a 2490 }
79072805 2491 return gp;
79072805
LW		 2492}
2493
2494void
864dbfa3 2495Perl_gp_free(pTHX_ GV *gv)
79072805 2496{
79072805 2497 GP* gp;
b0d55c99 2498 int attempts = 100;
79072805 2499
f7877b28 2500 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2501 return;
f248d071 2502 if (gp->gp_refcnt == 0) {
9b387841
NC		 2503 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2504 "Attempt to free unreferenced glob pointers"
2505 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2506 return;
2507 }
4571f4a7 2508 if (gp->gp_refcnt > 1) {
bc81b34d 2509 borrowed:
748a9306
LW		 2510 if (gp->gp_egv == gv)
2511 gp->gp_egv = 0;
4571f4a7 2512 gp->gp_refcnt--;
c43ae56f 2513 GvGP_set(gv, NULL);
79072805 2514 return;
748a9306 2515 }
79072805 2516
b0d55c99
FC		 2517 while (1) {
2518 /* Copy and null out all the glob slots, so destructors do not see
2519 freed SVs. */
2520 HEK * const file_hek = gp->gp_file_hek;
2521 SV * const sv = gp->gp_sv;
2522 AV * const av = gp->gp_av;
2523 HV * const hv = gp->gp_hv;
2524 IO * const io = gp->gp_io;
2525 CV * const cv = gp->gp_cv;
2526 CV * const form = gp->gp_form;
2527
2528 gp->gp_file_hek = NULL;
2529 gp->gp_sv = NULL;
2530 gp->gp_av = NULL;
2531 gp->gp_hv = NULL;
2532 gp->gp_io = NULL;
2533 gp->gp_cv = NULL;
2534 gp->gp_form = NULL;
2535
2536 if (file_hek)
2537 unshare_hek(file_hek);
2538
2539 SvREFCNT_dec(sv);
2540 SvREFCNT_dec(av);
2541 /* FIXME - another reference loop GV -> symtab -> GV ?
2542 Somehow gp->gp_hv can end up pointing at freed garbage. */
2543 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2544 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC		 2545 if (PL_stashcache && hvname_hek) {
2546 DEBUG_o(Perl_deb(aTHX_
2547 "gp_free clearing PL_stashcache for '%"HEKf"'\n",
2548 HEKfARG(hvname_hek)));
0ca9877d 2549 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2550 }
b0d55c99
FC		 2551 SvREFCNT_dec(hv);
2552 }
96d7c888
FC		 2553 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2554 && (IoTYPE(io) == IoTYPE_WRONLY ||
2555 IoTYPE(io) == IoTYPE_RDWR ||
2556 IoTYPE(io) == IoTYPE_APPEND)
2557 && ckWARN_d(WARN_IO)
2558 && IoIFP(io) != PerlIO_stdin()
2559 && IoIFP(io) != PerlIO_stdout()
2560 && IoIFP(io) != PerlIO_stderr()
2561 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2562 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC		 2563 SvREFCNT_dec(io);
2564 SvREFCNT_dec(cv);
2565 SvREFCNT_dec(form);
2566
bc81b34d
FC		 2567 /* Possibly reallocated by a destructor */
2568 gp = GvGP(gv);
2569
b0d55c99
FC		 2570 if (!gp->gp_file_hek
2571 && !gp->gp_sv
2572 && !gp->gp_av
2573 && !gp->gp_hv
2574 && !gp->gp_io
2575 && !gp->gp_cv
2576 && !gp->gp_form) break;
2577
2578 if (--attempts == 0) {
2579 Perl_die(aTHX_
2580 "panic: gp_free failed to free glob pointer - "
2581 "something is repeatedly re-creating entries"
2582 );
2583 }
13207a71 2584 }
748a9306 2585
bc81b34d
FC		 2586 /* Possibly incremented by a destructor doing glob assignment */
2587 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2588 Safefree(gp);
c43ae56f 2589 GvGP_set(gv, NULL);
79072805
LW		 2590}
2591
d460ef45
NIS		 2592int
2593Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2594{
53c1dcc0
AL		 2595 AMT * const amtp = (AMT*)mg->mg_ptr;
2596 PERL_UNUSED_ARG(sv);
dd374669 2597
7918f24d
NC		 2598 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2599
d460ef45
NIS		 2600 if (amtp && AMT_AMAGIC(amtp)) {
2601 int i;
2602 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2603 CV * const cv = amtp->table[i];
b37c2d43 2604 if (cv) {
e7881358 2605 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2606 amtp->table[i] = NULL;
d460ef45
NIS		 2607 }
2608 }
2609 }
2610 return 0;
2611}
2612
a0d0e21e 2613/* Updates and caches the CV's */
c3a9a790
RGS		 2614/* Returns:
2615 * 1 on success and there is some overload
2616 * 0 if there is no overload
2617 * -1 if some error occurred and it couldn't croak
2618 */
a0d0e21e 2619
c3a9a790 2620int
242f8760 2621Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2622{
ad64d0ec 2623 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2624 AMT amt;
9b439311 2625 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2626 U32 newgen;
a0d0e21e 2627
7918f24d
NC		 2628 PERL_ARGS_ASSERT_GV_AMUPDATE;
2629
9b439311 2630 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2631 if (mg) {
2632 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2633 if (amtp->was_ok_sub == newgen) {
8c34e50d 2634 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2635 }
ad64d0ec 2636 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2637 }
a0d0e21e 2638
bfcb3514 2639 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2640
d460ef45 2641 Zero(&amt,1,AMT);
e1a479c5 2642 amt.was_ok_sub = newgen;
a6006777 2643 amt.fallback = AMGfallNO;
2644 amt.flags = 0;
2645
a6006777 2646 {
8c34e50d
FC		 2647 int filled = 0;
2648 int i;
3d147ac2
DM		 2649 bool deref_seen = 0;
2650
a6006777 2651
3866ea3b 2652 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2653
89ffc314 2654 /* Try to find via inheritance. */
e6919483 2655 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2656 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2657 CV* cv;
89ffc314
IZ		 2658
2659 if (!gv)
3866ea3b
FC		 2660 {
2661 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2662 goto no_table;
3866ea3b
FC		 2663 }
2664#ifdef PERL_DONT_CREATE_GVSV
2665 else if (!sv) {
6f207bd3 2666 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2667 }
2668#endif
79c9643d
JL		 2669 else if (SvTRUE(sv))
2670 /* don't need to set overloading here because fallback => 1
2671 * is the default setting for classes without overloading */
89ffc314 2672 amt.fallback=AMGfallYES;
79c9643d
JL		 2673 else if (SvOK(sv)) {
2674 amt.fallback=AMGfallNEVER;
386a5489 2675 filled = 1;
386a5489 2676 }
79c9643d 2677 else {
386a5489 2678 filled = 1;
386a5489 2679 }
a6006777 2680
3d147ac2 2681 assert(SvOOK(stash));
3d147ac2 2682 /* initially assume the worst */
339441ef 2683 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2684
8c34e50d 2685 for (i = 1; i < NofAMmeth; i++) {
6136c704 2686 const char * const cooky = PL_AMG_names[i];
32251b26 2687 /* Human-readable form, for debugging: */
8c34e50d 2688 const char * const cp = AMG_id2name(i);
d279ab82 2689 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2690
a0288114 2691 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2692 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2693 /* don't fill the cache while looking up!
2694 Creation of inheritance stubs in intermediate packages may
2695 conflict with the logic of runtime method substitution.
2696 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2697 then we could have created stubs for "(+0" in A and C too.
2698 But if B overloads "bool", we may want to use it for
2699 numifying instead of C's "+0". */
8c34e50d 2700 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2701 cv = 0;
c3ad4e54
FC		 2702 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2703 const HEK * const gvhek =
2704 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2705 const HEK * const stashek =
2706 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2707 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2708 && stashek && HEK_LEN(stashek) == 8
2709 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ		 2710 /* This is a hack to support autoloading..., while
2711 knowing *which* methods were declared as overloaded. */
44a8e56a 2712 /* GvSV contains the name of the method. */
6136c704 2713 GV *ngv = NULL;
c69033f2 2714 SV *gvsv = GvSV(gv);
a0288114
AL		 2715
2716 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2717 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2718 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2719 if (!gvsv || !SvPOK(gvsv)
7f415459 2720 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2721 {
a0288114 2722 /* Can be an import stub (created by "can"). */
242f8760 2723 if (destructing) {
c3a9a790 2724 return -1;
242f8760
RGS		 2725 }
2726 else {
d66cca07
BF		 2727 const SV * const name = (gvsv && SvPOK(gvsv))
2728 ? gvsv
2729 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2730 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2731 Perl_croak(aTHX_ "%s method \"%"SVf256
2732 "\" overloading \"%s\" "\
d0c0e7dd 2733 "in package \"%"HEKf256"\"",
242f8760
RGS		 2734 (GvCVGEN(gv) ? "Stub found while resolving"
2735 : "Can't resolve"),
d66cca07 2736 SVfARG(name), cp,
d0c0e7dd 2737 HEKfARG(
d66cca07 2738 HvNAME_HEK(stash)
d0c0e7dd 2739 ));
242f8760 2740 }
44a8e56a 2741 }
dc848c6f 2742 cv = GvCV(gv = ngv);
44a8e56a 2743 }
b464bac0 2744 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2745 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2746 GvNAME(CvGV(cv))) );
2747 filled = 1;
611c1e95 2748 } else if (gv) { /* Autoloaded... */
ea726b52 2749 cv = MUTABLE_CV(gv);
611c1e95 2750 filled = 1;
44a8e56a 2751 }
ea726b52 2752 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2753
2754 if (gv) {
2755 switch (i) {
2756 case to_sv_amg:
2757 case to_av_amg:
2758 case to_hv_amg:
2759 case to_gv_amg:
2760 case to_cv_amg:
2761 case nomethod_amg:
2762 deref_seen = 1;
2763 break;
2764 }
2765 }
a0d0e21e 2766 }
3d147ac2 2767 if (!deref_seen)
45479970
DM		 2768 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2769 * NB - aux var invalid here, HvARRAY() could have been
2770 * reallocated since it was assigned to */
2771 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2772
a0d0e21e 2773 if (filled) {
a6006777 2774 AMT_AMAGIC_on(&amt);
ad64d0ec 2775 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2776 (char*)&amt, sizeof(AMT));
8c34e50d 2777 return TRUE;
a0d0e21e
LW		 2778 }
2779 }
a6006777 2780 /* Here we have no table: */
8c34e50d 2781 no_table:
a6006777 2782 AMT_AMAGIC_off(&amt);
ad64d0ec 2783 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2784 (char*)&amt, sizeof(AMTS));
c3a9a790 2785 return 0;
a0d0e21e
LW		 2786}
2787
32251b26
IZ		 2788
2789CV*
2790Perl_gv_handler(pTHX_ HV *stash, I32 id)
2791{
3f8f4626 2792 MAGIC *mg;
32251b26 2793 AMT *amtp;
e1a479c5 2794 U32 newgen;
9b439311 2795 struct mro_meta* stash_meta;
32251b26 2796
bfcb3514 2797 if (!stash || !HvNAME_get(stash))
601f1833 2798 return NULL;
e1a479c5 2799
9b439311
BB		 2800 stash_meta = HvMROMETA(stash);
2801 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2802
ad64d0ec 2803 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2804 if (!mg) {
2805 do_update:
8c34e50d 2806 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2807 return NULL;
ad64d0ec 2808 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2809 }
a9fd4e40 2810 assert(mg);
32251b26 2811 amtp = (AMT*)mg->mg_ptr;
66978156 2812 if ( amtp->was_ok_sub != newgen )
32251b26 2813 goto do_update;
3ad83ce7 2814 if (AMT_AMAGIC(amtp)) {
b7787f18 2815 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2816 if (ret && isGV(ret)) { /* Autoloading stab */
2817 /* Passing it through may have resulted in a warning
2818 "Inherited AUTOLOAD for a non-method deprecated", since
2819 our caller is going through a function call, not a method call.
2820 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2821 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2822
2823 if (gv && GvCV(gv))
2824 return GvCV(gv);
2825 }
2826 return ret;
2827 }
a0288114 2828
601f1833 2829 return NULL;
32251b26
IZ		 2830}
2831
2832
6f1401dc
DM		 2833/* Implement tryAMAGICun_MG macro.
2834 Do get magic, then see if the stack arg is overloaded and if so call it.
2835 Flags:
2836 AMGf_set return the arg using SETs rather than assigning to
2837 the targ
2838 AMGf_numeric apply sv_2num to the stack arg.
2839*/
2840
2841bool
2842Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2843 dSP;
2844 SV* tmpsv;
2845 SV* const arg = TOPs;
2846
2847 SvGETMAGIC(arg);
2848
9f8bf298 2849 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC		 2850 AMGf_noright | AMGf_unary
2851 | (flags & AMGf_numarg))))
2852 {
6f1401dc
DM		 2853 if (flags & AMGf_set) {
2854 SETs(tmpsv);
2855 }
2856 else {
2857 dTARGET;
2858 if (SvPADMY(TARG)) {
2859 sv_setsv(TARG, tmpsv);
2860 SETTARG;
2861 }
2862 else
2863 SETs(tmpsv);
2864 }
2865 PUTBACK;
2866 return TRUE;
2867 }
2868
2869 if ((flags & AMGf_numeric) && SvROK(arg))
2870 *sp = sv_2num(arg);
2871 return FALSE;
2872}
2873
2874
2875/* Implement tryAMAGICbin_MG macro.
2876 Do get magic, then see if the two stack args are overloaded and if so
2877 call it.
2878 Flags:
2879 AMGf_set return the arg using SETs rather than assigning to
2880 the targ
2881 AMGf_assign op may be called as mutator (eg +=)
2882 AMGf_numeric apply sv_2num to the stack arg.
2883*/
2884
2885bool
2886Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 2887 dSP;
2888 SV* const left = TOPm1s;
2889 SV* const right = TOPs;
2890
2891 SvGETMAGIC(left);
2892 if (left != right)
2893 SvGETMAGIC(right);
2894
2895 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2896 SV * const tmpsv = amagic_call(left, right, method,
636ac8fc
FC		 2897 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0)
2898 | (flags & AMGf_numarg));
6f1401dc
DM		 2899 if (tmpsv) {
2900 if (flags & AMGf_set) {
2901 (void)POPs;
2902 SETs(tmpsv);
2903 }
2904 else {
2905 dATARGET;
2906 (void)POPs;
2907 if (opASSIGN || SvPADMY(TARG)) {
2908 sv_setsv(TARG, tmpsv);
2909 SETTARG;
2910 }
2911 else
2912 SETs(tmpsv);
2913 }
2914 PUTBACK;
2915 return TRUE;
2916 }
2917 }
75ea7a12
FC		 2918 if(left==right && SvGMAGICAL(left)) {
2919 SV * const left = sv_newmortal();
2920 *(sp-1) = left;
2921 /* Print the uninitialized warning now, so it includes the vari-
2922 able name. */
2923 if (!SvOK(right)) {
2924 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2925 sv_setsv_flags(left, &PL_sv_no, 0);
2926 }
2927 else sv_setsv_flags(left, right, 0);
2928 SvGETMAGIC(right);
2929 }
6f1401dc 2930 if (flags & AMGf_numeric) {
75ea7a12
FC		 2931 if (SvROK(TOPm1s))
2932 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2933 if (SvROK(right))
2934 *sp = sv_2num(right);
2935 }
2936 return FALSE;
2937}
2938
25a9ffce
NC		 2939SV *
2940Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2941 SV *tmpsv = NULL;
3d147ac2 2942 HV *stash;
25a9ffce
NC		 2943
2944 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2945
3d147ac2
DM		 2946 if (!SvAMAGIC(ref))
2947 return ref;
2948 /* return quickly if none of the deref ops are overloaded */
2949 stash = SvSTASH(SvRV(ref));
2950 assert(SvOOK(stash));
2951 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2952 return ref;
2953
2954 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 2955 AMGf_noright | AMGf_unary))) {
2956 if (!SvROK(tmpsv))
2957 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2958 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2959 /* Bail out if it returns us the same reference. */
2960 return tmpsv;
2961 }
2962 ref = tmpsv;
3d147ac2
DM		 2963 if (!SvAMAGIC(ref))
2964 break;
25a9ffce
NC		 2965 }
2966 return tmpsv ? tmpsv : ref;
2967}
6f1401dc 2968
8d569291
FC		 2969bool
2970Perl_amagic_is_enabled(pTHX_ int method)
2971{
2972 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2973
2974 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2975
2976 if ( !lex_mask || !SvOK(lex_mask) )
2977 /* overloading lexically disabled */
2978 return FALSE;
2979 else if ( lex_mask && SvPOK(lex_mask) ) {
2980 /* we have an entry in the hints hash, check if method has been
2981 * masked by overloading.pm */
2982 STRLEN len;
2983 const int offset = method / 8;
2984 const int bit = method % 8;
2985 char *pv = SvPV(lex_mask, len);
2986
2987 /* Bit set, so this overloading operator is disabled */
2988 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2989 return FALSE;
2990 }
2991 return TRUE;
2992}
2993
a0d0e21e 2994SV*
864dbfa3 2995Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2996{
27da23d5 2997 dVAR;
b267980d 2998 MAGIC *mg;
9c5ffd7c 2999 CV *cv=NULL;
a0d0e21e 3000 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3001 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 3002 int off = 0, off1, lr = 0, notfound = 0;
3003 int postpr = 0, force_cpy = 0;
3004 int assign = AMGf_assign & flags;
3005 const int assignshift = assign ? 1 : 0;
bf5522a1 3006 int use_default_op = 0;
67288365 3007 int force_scalar = 0;
497b47a8
JH		 3008#ifdef DEBUGGING
3009 int fl=0;
497b47a8 3010#endif
25716404 3011 HV* stash=NULL;
7918f24d
NC		 3012
3013 PERL_ARGS_ASSERT_AMAGIC_CALL;
3014
e46c382e 3015 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3016 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 3017 }
3018
a0d0e21e 3019 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3020 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3021 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3022 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3023 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3024 : NULL))
b267980d 3025 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 3026 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3027 * usual method */
497b47a8
JH		 3028 (
3029#ifdef DEBUGGING
3030 fl = 1,
a0288114 3031#endif
497b47a8 3032 cv = cvp[off=method])))) {
a0d0e21e
LW		 3033 lr = -1; /* Call method for left argument */
3034 } else {
3035 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3036 int logic;
3037
3038 /* look for substituted methods */
ee239bfe 3039 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 3040 switch (method) {
3041 case inc_amg:
ee239bfe
IZ		 3042 force_cpy = 1;
3043 if ((cv = cvp[off=add_ass_amg])
3044 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3045 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3046 }
3047 break;
3048 case dec_amg:
ee239bfe
IZ		 3049 force_cpy = 1;
3050 if ((cv = cvp[off = subtr_ass_amg])
3051 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3052 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3053 }
3054 break;
3055 case bool__amg:
3056 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3057 break;
3058 case numer_amg:
3059 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3060 break;
3061 case string_amg:
3062 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3063 break;
b7787f18
AL		 3064 case not_amg:
3065 (void)((cv = cvp[off=bool__amg])
3066 || (cv = cvp[off=numer_amg])
3067 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 3068 if (cv)
3069 postpr = 1;
b7787f18 3070 break;
748a9306
LW		 3071 case copy_amg:
3072 {
76e3520e
GS		 3073 /*
3074 * SV* ref causes confusion with the interpreter variable of
3075 * the same name
3076 */
890ce7af 3077 SV* const tmpRef=SvRV(left);
76e3520e 3078 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 3079 /*
3080 * Just to be extra cautious. Maybe in some
3081 * additional cases sv_setsv is safe, too.
3082 */
890ce7af 3083 SV* const newref = newSVsv(tmpRef);
748a9306 3084 SvOBJECT_on(newref);
a1cd65be
FC		 3085 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3086 delegate to the stash. */
85fbaab2 3087 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 3088 return newref;
3089 }
3090 }
3091 break;
a0d0e21e 3092 case abs_amg:
b267980d 3093 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3094 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3095 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3096 if (off1==lt_amg) {
890ce7af 3097 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3098 lt_amg,AMGf_noright);
3099 logic = SvTRUE(lessp);
3100 } else {
890ce7af 3101 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3102 ncmp_amg,AMGf_noright);
3103 logic = (SvNV(lessp) < 0);
3104 }
3105 if (logic) {
3106 if (off==subtr_amg) {
3107 right = left;
748a9306 3108 left = nullsv;
a0d0e21e
LW		 3109 lr = 1;
3110 }
3111 } else {
3112 return left;
3113 }
3114 }
3115 break;
3116 case neg_amg:
155aba94 3117 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 3118 right = left;
3119 left = sv_2mortal(newSViv(0));
3120 lr = 1;
3121 }
3122 break;
f216259d 3123 case int_amg:
f5284f61 3124 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3125 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3126 case regexp_amg:
b267980d
NIS		 3127 /* FAIL safe */
3128 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3129
f5284f61
IZ		 3130 case to_sv_amg:
3131 case to_av_amg:
3132 case to_hv_amg:
3133 case to_gv_amg:
3134 case to_cv_amg:
3135 /* FAIL safe */
b267980d 3136 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3137
a0d0e21e
LW		 3138 default:
3139 goto not_found;
3140 }
3141 if (!cv) goto not_found;
3142 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3143 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3144 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3145 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3146 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3147 : NULL))
69815d08
RS		 3148 && (cv = cvp[off=method])) { /* Method for right
3149 * argument found */
3150 lr=1;
bf5522a1
MB		 3151 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3152 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 3153 && !(flags & AMGf_unary)) {
3154 /* We look for substitution for
3155 * comparison operations and
fc36a67e 3156 * concatenation */
a0d0e21e
LW		 3157 if (method==concat_amg || method==concat_ass_amg
3158 || method==repeat_amg || method==repeat_ass_amg) {
3159 return NULL; /* Delegate operation to string conversion */
3160 }
3161 off = -1;
3162 switch (method) {
3163 case lt_amg:
3164 case le_amg:
3165 case gt_amg:
3166 case ge_amg:
3167 case eq_amg:
3168 case ne_amg:
2ab54efd
MB		 3169 off = ncmp_amg;
3170 break;
a0d0e21e
LW		 3171 case slt_amg:
3172 case sle_amg:
3173 case sgt_amg:
3174 case sge_amg:
3175 case seq_amg:
3176 case sne_amg:
2ab54efd
MB		 3177 off = scmp_amg;
3178 break;
a0d0e21e 3179 }
bf5522a1
MB		 3180 if (off != -1) {
3181 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3182 cv = ocvp[off];
3183 lr = -1;
3184 }
3185 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3186 cv = cvp[off];
3187 lr = 1;
3188 }
3189 }
3190 if (cv)
2ab54efd
MB		 3191 postpr = 1;
3192 else
3193 goto not_found;
a0d0e21e 3194 } else {
a6006777 3195 not_found: /* No method found, either report or croak */
b267980d
NIS		 3196 switch (method) {
3197 case to_sv_amg:
3198 case to_av_amg:
3199 case to_hv_amg:
3200 case to_gv_amg:
3201 case to_cv_amg:
3202 /* FAIL safe */
3203 return left; /* Delegate operation to standard mechanisms. */
b267980d 3204 }
a0d0e21e
LW		 3205 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3206 notfound = 1; lr = -1;
3207 } else if (cvp && (cv=cvp[nomethod_amg])) {
3208 notfound = 1; lr = 1;
bf5522a1
MB		 3209 } else if ((use_default_op =
3210 (!ocvp || oamtp->fallback >= AMGfallYES)
3211 && (!cvp || amtp->fallback >= AMGfallYES))
3212 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3213 /* Skip generating the "no method found" message. */
3214 return NULL;
a0d0e21e 3215 } else {
46fc3d4c 3216 SV *msg;
774d564b 3217 if (off==-1) off=method;
b267980d 3218 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3219 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3220 AMG_id2name(method + assignshift),
3221 (flags & AMGf_unary ? " " : "\n\tleft "),
3222 SvAMAGIC(left)?
3223 "in overloaded package ":
3224 "has no overloaded magic",
3225 SvAMAGIC(left)?
3226 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3227 SVfARG(&PL_sv_no),
3228 SvAMAGIC(right)?
3229 ",\n\tright argument in overloaded package ":
3230 (flags & AMGf_unary
3231 ? ""
3232 : ",\n\tright argument has no overloaded magic"),
3233 SvAMAGIC(right)?
3234 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3235 SVfARG(&PL_sv_no)));
bf5522a1 3236 if (use_default_op) {
d66cca07 3237 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3238 } else {
be2597df 3239 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3240 }
3241 return NULL;
3242 }
ee239bfe 3243 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3244 }
3245 }
67288365
JL		 3246
3247 switch (method) {
3248 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3249 * operation. we need this to return a value, so that it can be assigned
3250 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3251 * increment or decrement was itself called in void context */
3252 case inc_amg:
3253 if (off == add_amg)
3254 force_scalar = 1;
3255 break;
3256 case dec_amg:
3257 if (off == subtr_amg)
3258 force_scalar = 1;
3259 break;
3260 /* in these cases, we're calling an assignment variant of an operator
3261 * (+= rather than +, for instance). regardless of whether it's a
3262 * fallback or not, it always has to return a value, which will be
3263 * assigned to the proper variable later */
3264 case add_amg:
3265 case subtr_amg:
3266 case mult_amg:
3267 case div_amg:
3268 case modulo_amg:
3269 case pow_amg:
3270 case lshift_amg:
3271 case rshift_amg:
3272 case repeat_amg:
3273 case concat_amg:
3274 case band_amg:
3275 case bor_amg:
3276 case bxor_amg:
6d06ecce
FC		 3277 case sband_amg:
3278 case sbor_amg:
3279 case sbxor_amg:
67288365
JL		 3280 if (assign)
3281 force_scalar = 1;
3282 break;
3283 /* the copy constructor always needs to return a value */
3284 case copy_amg:
3285 force_scalar = 1;
3286 break;
3287 /* because of the way these are implemented (they don't perform the
3288 * dereferencing themselves, they return a reference that perl then
3289 * dereferences later), they always have to be in scalar context */
3290 case to_sv_amg:
3291 case to_av_amg:
3292 case to_hv_amg:
3293 case to_gv_amg:
3294 case to_cv_amg:
3295 force_scalar = 1;
3296 break;
3297 /* these don't have an op of their own; they're triggered by their parent
3298 * op, so the context there isn't meaningful ('$a and foo()' in void
3299 * context still needs to pass scalar context on to $a's bool overload) */
3300 case bool__amg:
3301 case numer_amg:
3302 case string_amg:
3303 force_scalar = 1;
3304 break;
3305 }
3306
497b47a8 3307#ifdef DEBUGGING
a0d0e21e 3308 if (!notfound) {
497b47a8 3309 DEBUG_o(Perl_deb(aTHX_
d66cca07 3310 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3311 AMG_id2name(off),
3312 method+assignshift==off? "" :
a0288114 3313 " (initially \"",
497b47a8
JH		 3314 method+assignshift==off? "" :
3315 AMG_id2name(method+assignshift),
a0288114 3316 method+assignshift==off? "" : "\")",
497b47a8
JH		 3317 flags & AMGf_unary? "" :
3318 lr==1 ? " for right argument": " for left argument",
3319 flags & AMGf_unary? " for argument" : "",
d66cca07 3320 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3321 fl? ",\n\tassignment variant used": "") );
ee239bfe 3322 }
497b47a8 3323#endif
748a9306
LW		 3324 /* Since we use shallow copy during assignment, we need
3325 * to dublicate the contents, probably calling user-supplied
3326 * version of copy operator
3327 */
ee239bfe
IZ		 3328 /* We need to copy in following cases:
3329 * a) Assignment form was called.
3330 * assignshift==1, assign==T, method + 1 == off
3331 * b) Increment or decrement, called directly.
3332 * assignshift==0, assign==0, method + 0 == off
3333 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3334 * assignshift==0, assign==T,
ee239bfe
IZ		 3335 * force_cpy == T
3336 * d) Increment or decrement, translated to nomethod.
b267980d 3337 * assignshift==0, assign==0,
ee239bfe
IZ		 3338 * force_cpy == T
3339 * e) Assignment form translated to nomethod.
3340 * assignshift==1, assign==T, method + 1 != off
3341 * force_cpy == T
3342 */
3343 /* off is method, method+assignshift, or a result of opcode substitution.
3344 * In the latter case assignshift==0, so only notfound case is important.
3345 */
73512201 3346 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3347 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3348 || force_cpy) )
6f1401dc 3349 {
1b38c28e
NC		 3350 /* newSVsv does not behave as advertised, so we copy missing
3351 * information by hand */
3352 SV *tmpRef = SvRV(left);
3353 SV *rv_copy;
31d632c3 3354 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3355 SvRV_set(left, rv_copy);
3356 SvSETMAGIC(left);
e7881358 3357 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3358 }
6f1401dc
DM		 3359 }
3360
a0d0e21e
LW		 3361 {
3362 dSP;
3363 BINOP myop;
3364 SV* res;
b7787f18 3365 const bool oldcatch = CATCH_GET;
67288365
JL		 3366 I32 oldmark, nret;
3367 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3368
54310121 3369 CATCH_SET(TRUE);
a0d0e21e
LW		 3370 Zero(&myop, 1, BINOP);
3371 myop.op_last = (OP *) &myop;
b37c2d43 3372 myop.op_next = NULL;
67288365
JL		 3373 myop.op_flags = OPf_STACKED;
3374
3375 switch (gimme) {
3376 case G_VOID:
3377 myop.op_flags |= OPf_WANT_VOID;
3378 break;
3379 case G_ARRAY:
3380 if (flags & AMGf_want_list) {
3381 myop.op_flags |= OPf_WANT_LIST;
3382 break;
3383 }
3384 /* FALLTHROUGH */
3385 default:
3386 myop.op_flags |= OPf_WANT_SCALAR;
3387 break;
3388 }
a0d0e21e 3389
e788e7d3 3390 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3391 ENTER;
462e5cf6 3392 SAVEOP();
533c011a 3393 PL_op = (OP *) &myop;
3280af22 3394 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3395 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3396 Perl_pp_pushmark(aTHX);
a0d0e21e 3397
924508f0 3398 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3399 PUSHs(lr>0? right: left);
3400 PUSHs(lr>0? left: right);
3280af22 3401 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3402 if (notfound) {
59cd0e26
NC		 3403 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3404 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3405 }
636ac8fc
FC		 3406 else if (flags & AMGf_numarg)
3407 PUSHs(&PL_sv_undef);
3408 if (flags & AMGf_numarg)
3409 PUSHs(&PL_sv_yes);
ad64d0ec 3410 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3411 PUTBACK;
67288365 3412 oldmark = TOPMARK;
a0d0e21e 3413
139d0ce6 3414 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3415 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3416 LEAVE;
3417 SPAGAIN;
67288365
JL		 3418 nret = SP - (PL_stack_base + oldmark);
3419
3420 switch (gimme) {
3421 case G_VOID:
3422 /* returning NULL has another meaning, and we check the context
3423 * at the call site too, so this can be differentiated from the
3424 * scalar case */
3425 res = &PL_sv_undef;
3426 SP = PL_stack_base + oldmark;
3427 break;
3428 case G_ARRAY: {
3429 if (flags & AMGf_want_list) {
3430 res = sv_2mortal((SV *)newAV());
3431 av_extend((AV *)res, nret);
3432 while (nret--)
3433 av_store((AV *)res, nret, POPs);
3434 break;
3435 }
3436 /* FALLTHROUGH */
3437 }
3438 default:
3439 res = POPs;
3440 break;
3441 }
a0d0e21e 3442
ebafeae7 3443 PUTBACK;
d3acc0f7 3444 POPSTACK;
54310121 3445 CATCH_SET(oldcatch);
a0d0e21e 3446
a0d0e21e 3447 if (postpr) {
b7787f18 3448 int ans;
a0d0e21e
LW		 3449 switch (method) {
3450 case le_amg:
3451 case sle_amg:
3452 ans=SvIV(res)<=0; break;
3453 case lt_amg:
3454 case slt_amg:
3455 ans=SvIV(res)<0; break;
3456 case ge_amg:
3457 case sge_amg:
3458 ans=SvIV(res)>=0; break;
3459 case gt_amg:
3460 case sgt_amg:
3461 ans=SvIV(res)>0; break;
3462 case eq_amg:
3463 case seq_amg:
3464 ans=SvIV(res)==0; break;
3465 case ne_amg:
3466 case sne_amg:
3467 ans=SvIV(res)!=0; break;
3468 case inc_amg:
3469 case dec_amg:
bbce6d69 3470 SvSetSV(left,res); return left;
dc437b57 3471 case not_amg:
fe7ac86a 3472 ans=!SvTRUE(res); break;
b7787f18
AL		 3473 default:
3474 ans=0; break;
a0d0e21e 3475 }
54310121 3476 return boolSV(ans);
748a9306
LW		 3477 } else if (method==copy_amg) {
3478 if (!SvROK(res)) {
cea2e8a9 3479 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3480 }
3481 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3482 } else {
3483 return res;
3484 }
3485 }
3486}
c9d5ac95 3487
f5c1e807
NC		 3488void
3489Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3490{
3491 dVAR;
acda4c6a 3492 U32 hash;
f5c1e807 3493
7918f24d 3494 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3495
acda4c6a
NC		 3496 if (len > I32_MAX)
3497 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3498
ae8cc45f
NC		 3499 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3500 unshare_hek(GvNAME_HEK(gv));
3501 }
3502
acda4c6a 3503 PERL_HASH(hash, name, len);
c60dbbc3 3504 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3505}
3506
66610fdd 3507/*
f7461760
Z		 3508=for apidoc gv_try_downgrade
3509
2867cdbc
Z		 3510If the typeglob C<gv> can be expressed more succinctly, by having
3511something other than a real GV in its place in the stash, replace it
3512with the optimised form. Basic requirements for this are that C<gv>
3513is a real typeglob, is sufficiently ordinary, and is only referenced
3514from its package. This function is meant to be used when a GV has been
3515looked up in part to see what was there, causing upgrading, but based
3516on what was found it turns out that the real GV isn't required after all.
3517
3518If C<gv> is a completely empty typeglob, it is deleted from the stash.
3519
3520If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3521sub, the typeglob is replaced with a scalar-reference placeholder that
3522more compactly represents the same thing.
f7461760
Z		 3523
3524=cut
3525*/
3526
3527void
3528Perl_gv_try_downgrade(pTHX_ GV *gv)
3529{
3530 HV *stash;
3531 CV *cv;
3532 HEK *namehek;
3533 SV **gvp;
3534 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3535
3536 /* XXX Why and where does this leave dangling pointers during global
3537 destruction? */
627364f1 3538 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3539
2867cdbc 3540 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3541 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3542 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3543 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3544 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3545 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3546 return;
2be08ad1
FC		 3547 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3548 return;
803f2748
DM		 3549 if (SvMAGICAL(gv)) {
3550 MAGIC *mg;
3551 /* only backref magic is allowed */
3552 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3553 return;
3554 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3555 if (mg->mg_type != PERL_MAGIC_backref)
3556 return;
3557 }
3558 }
2867cdbc
Z		 3559 cv = GvCV(gv);
3560 if (!cv) {
3561 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3562 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3563 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3564 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3565 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z		 3566 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3567 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3568 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3569 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3570 *gvp == (SV*)gv) {
3571 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3572 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3573 SvREFCNT(gv) = 0;
3574 sv_clear((SV*)gv);
3575 SvREFCNT(gv) = 1;
70e5f2b5 3576 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH		 3577
3578 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z		 3579 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3580 STRUCT_OFFSET(XPVIV, xiv_iv));
3581 SvRV_set(gv, value);
3582 }
3583}
3584
9e3fb20c
FC		 3585GV *
3586Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3587{
3588 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3589 GV * const *gvp;
3590 PERL_ARGS_ASSERT_GV_OVERRIDE;
3591 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3592 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3593 gv = gvp ? *gvp : NULL;
3594 if (gv && !isGV(gv)) {
3595 if (!SvPCS_IMPORTED(gv)) return NULL;
3596 gv_init(gv, PL_globalstash, name, len, 0);
3597 return gv;
3598 }
3599 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3600}
3601
4aaa4757
FC		 3602#include "XSUB.h"
3603
3604static void
3605core_xsub(pTHX_ CV* cv)
3606{
3607 Perl_croak(aTHX_
3608 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3609 );
3610}
3611
f7461760 3612/*
14d04a33 3613 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3614 */
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