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perl.pod: Use consistent perldelta order
[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"
8261f8eb 37#include "overload.c"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a
AL		 41static const char S_autoload[] = "AUTOLOAD";
42static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 43
c69033f2 44GV *
d5713896 45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13be902c
FC		 49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
53 && SvTYPE((const SV *)gv) != SVt_PVLV
54 )
55 ) {
bb85b28a
NC		 56 const char *what;
57 if (type == SVt_PVIO) {
58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
bb85b28a
NC		 64 } else if (type == SVt_PVHV) {
65 what = "hash";
66 } else {
67 what = type == SVt_PVAV ? "array" : "scalar";
68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC		 70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896
NC		 72
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
bb85b28a
NC		 77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
d5713896
NC		 79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
d5713896 83 if (!*where)
e17aed30 84 {
d5713896 85 *where = newSV_type(type);
e17aed30
FC		 86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
89 }
79072805
LW		 90 return gv;
91}
92
93GV *
864dbfa3 94Perl_gv_fetchfile(pTHX_ const char *name)
79072805 95{
7918f24d 96 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC		 97 return gv_fetchfile_flags(name, strlen(name), 0);
98}
99
100GV *
101Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
102 const U32 flags)
103{
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW		 107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC		 110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS		 116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS		 120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC		 122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
5a9a79a4 132 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
43e4250a 133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
53d95988
CS		 134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW		 136 return gv;
137}
138
62d55b22
NC		 139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
145NULL.
146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d 153 PERL_ARGS_ASSERT_GV_CONST_SV;
23491f1d 154 PERL_UNUSED_CONTEXT;
7918f24d 155
62d55b22
NC		 156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
6f1b3ab0 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
62d55b22
NC		 159}
160
12816592
NC		 161GP *
162Perl_newGP(pTHX_ GV *const gv)
163{
164 GP *gp;
19bad673 165 U32 hash;
19bad673
NC		 166 const char *file;
167 STRLEN len;
2639089b 168#ifndef USE_ITHREADS
6b352265 169 GV *filegv;
2639089b 170#endif
c2587955 171 dVAR;
19bad673 172
7918f24d 173 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD		 174 Newxz(gp, 1, GP);
175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
176#ifndef PERL_DONT_CREATE_GVSV
177 gp->gp_sv = newSV(0);
178#endif
7918f24d 179
c947bc1d
FC		 180 /* PL_curcop may be null here. E.g.,
181 INIT { bless {} and exit }
182 frees INIT before looking up DESTROY (and creating *DESTROY)
183 */
2639089b
DD		 184 if (PL_curcop) {
185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 186#ifdef USE_ITHREADS
2639089b
DD		 187 if (CopFILE(PL_curcop)) {
188 file = CopFILE(PL_curcop);
189 len = strlen(file);
190 }
2639089b 191#else
cb0d3385
FC		 192 filegv = CopFILEGV(PL_curcop);
193 if (filegv) {
194 file = GvNAME(filegv)+2;
195 len = GvNAMELEN(filegv)-2;
196 }
6e314d4f 197#endif
cb0d3385
FC		 198 else goto no_file;
199 }
200 else {
201 no_file:
19bad673
NC		 202 file = "";
203 len = 0;
204 }
f4890806
NC		 205
206 PERL_HASH(hash, file, len);
f4890806 207 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC		 208 gp->gp_refcnt = 1;
209
210 return gp;
211}
212
803f2748
DM		 213/* Assign CvGV(cv) = gv, handling weak references.
214 * See also S_anonymise_cv_maybe */
215
216void
217Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
218{
ae77754a 219 GV * const oldgv = CvNAMED(cv) ? NULL : SvANY(cv)->xcv_gv_u.xcv_gv;
b290562e 220 HEK *hek;
803f2748
DM		 221 PERL_ARGS_ASSERT_CVGV_SET;
222
223 if (oldgv == gv)
224 return;
225
226 if (oldgv) {
cfc1e951 227 if (CvCVGV_RC(cv)) {
e7881358 228 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM		 229 CvCVGV_RC_off(cv);
230 }
803f2748 231 else {
803f2748
DM		 232 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
233 }
234 }
db5cc3ee
FC		 235 else if ((hek = CvNAME_HEK(cv))) {
236 unshare_hek(hek);
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
307overwriting it as happens with typeglobs created by SvSetSV. Converting
308any scalar that is SvOK() may produce unpredictable results and is reserved
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
04ec7e59
FC		 321C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
322the return value of SvUTF8(sv). It can also take the
323GV_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
328The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC		 329has no flags parameter. If the C<multi> parameter is set, the
330GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC		 331
332=for apidoc gv_init_pv
333
334Same as gv_init_pvn(), but takes a nul-terminated string for the name
335instead of separate char * and length parameters.
336
337=for apidoc gv_init_sv
338
339Same as gv_init_pvn(), but takes an SV * for the name instead of separate
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{
e6066781 462 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 463
a0d0e21e
LW		 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
NC		 474#ifdef PERL_DONT_CREATE_GVSV
475 case SVt_NULL:
476 case SVt_PVCV:
477 case SVt_PVFM:
e654831b 478 case SVt_PVGV:
c69033f2
NC		 479 break;
480 default:
dbdce04c
NC		 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. */
575 (void)gv_fetchfile(file);
576 CvFILE(cv) = (char *)file;
577 /* XXX This is inefficient, as doing things this order causes
578 a prototype check in newATTRSUB. But we have to do
579 it this order as we need an op number before calling
580 new ATTRSUB. */
581 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 582 if (stash)
73c02f15 583 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 584 if (ampable) {
4428fb0e
TC		 585#ifdef DEBUGGING
586 CV *orig_cv = cv;
587#endif
0f8d4b5e 588 CvLVALUE_on(cv);
4428fb0e
TC		 589 /* newATTRSUB will free the CV and return NULL if we're still
590 compiling after a syntax error */
e8f91c91 591 if ((cv = newATTRSUB_x(
7e68c38b 592 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 593 NULL,NULL,
594 coresub_op(
595 opnum
596 ? newSVuv((UV)opnum)
597 : newSVpvn(name,len),
598 code, opnum
7e68c38b 599 ),
e8f91c91 600 TRUE
4428fb0e
TC		 601 )) != NULL) {
602 assert(GvCV(gv) == orig_cv);
603 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
604 && opnum != OP_UNDEF)
605 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
606 }
0f8d4b5e
FC		 607 LEAVE;
608 PL_parser = oldparser;
609 PL_curcop = oldcurcop;
610 PL_compcv = oldcompcv;
611 }
4428fb0e
TC		 612 if (cv) {
613 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
614 cv_set_call_checker(
615 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
616 );
617 SvREFCNT_dec(opnumsv);
618 }
619
0f8d4b5e
FC		 620 return gv;
621}
622
954c1994 623/*
6c53d59b
FC		 624=for apidoc gv_fetchmeth
625
626Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
627
e6919483
BF		 628=for apidoc gv_fetchmeth_sv
629
630Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
631of an SV instead of a string/length pair.
632
633=cut
634*/
635
636GV *
637Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
638{
c290e187 639 char *namepv;
640 STRLEN namelen;
641 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
642 if (LIKELY(SvPOK_nog(namesv))) /* common case */
643 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, flags);
644 namepv = SvPV(namesv, namelen);
645 if (SvUTF8(namesv)) flags |= SVf_UTF8;
646 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF		 647}
648
649/*
650=for apidoc gv_fetchmeth_pv
651
652Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
653instead of a string/length pair.
654
655=cut
656*/
657
658GV *
659Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
660{
661 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 662 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF		 663}
664
665/*
666=for apidoc gv_fetchmeth_pvn
954c1994
GS		 667
668Returns the glob with the given C<name> and a defined subroutine or
669C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 670accessible via @ISA and UNIVERSAL::.
954c1994
GS		 671
672The argument C<level> should be either 0 or -1. If C<level==0>, as a
673side-effect creates a glob with the given C<name> in the given C<stash>
674which in the case of success contains an alias for the subroutine, and sets
e1a479c5 675up caching info for this glob.
954c1994 676
aae43805
FC		 677The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
678
679GV_SUPER indicates that we want to look up the method in the superclasses
680of the C<stash>.
e6919483 681
aae43805 682The
954c1994 683GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 684visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 685the GV directly; instead, you should use the method's CV, which can be
b267980d 686obtained from the GV with the C<GvCV> macro.
954c1994
GS		 687
688=cut
689*/
690
e1a479c5
BB		 691/* NOTE: No support for tied ISA */
692
c6afe666 693PERL_STATIC_INLINE GV*
694S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 695{
463ee0b2 696 GV** gvp;
c6afe666 697 HE* he;
e1a479c5
BB		 698 AV* linear_av;
699 SV** linear_svp;
700 SV* linear_sv;
aae43805 701 HV* cstash, *cachestash;
e1a479c5
BB		 702 GV* candidate = NULL;
703 CV* cand_cv = NULL;
e1a479c5 704 GV* topgv = NULL;
bfcb3514 705 const char *hvname;
c6afe666 706 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 707 I32 items;
e1a479c5 708 U32 topgen_cmp;
04f3bf56 709 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 710
af09ea45
IK		 711 /* UNIVERSAL methods should be callable without a stash */
712 if (!stash) {
e1a479c5 713 create = 0; /* probably appropriate */
da51bb9b 714 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 715 return 0;
716 }
717
e1a479c5
BB		 718 assert(stash);
719
bfcb3514
NC		 720 hvname = HvNAME_get(stash);
721 if (!hvname)
e1a479c5 722 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 723
e1a479c5 724 assert(hvname);
55df6700 725 assert(name || meth);
463ee0b2 726
aae43805 727 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC		 728 flags & GV_SUPER ? "SUPER " : "",
729 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 730
dd69841b 731 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 732
aae43805 733 if (flags & GV_SUPER) {
1a33a059
FC		 734 if (!HvAUX(stash)->xhv_mro_meta->super)
735 HvAUX(stash)->xhv_mro_meta->super = newHV();
736 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC		 737 }
738 else cachestash = stash;
739
e1a479c5 740 /* check locally for a real method or a cache entry */
c6afe666 741 he = (HE*)hv_common(
742 cachestash, meth, name, len, (flags & SVf_UTF8) ? HVhek_UTF8 : 0, create, NULL, 0
743 );
744 if (he) gvp = (GV**)&HeVAL(he);
745 else gvp = NULL;
746
e1a479c5
BB		 747 if(gvp) {
748 topgv = *gvp;
0f8d4b5e 749 have_gv:
e1a479c5
BB		 750 assert(topgv);
751 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC		 752 {
753 if (!name)
754 name = SvPV_nomg(meth, len);
04ec7e59 755 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 756 }
e1a479c5
BB		 757 if ((cand_cv = GvCV(topgv))) {
758 /* If genuine method or valid cache entry, use it */
759 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
760 return topgv;
761 }
762 else {
763 /* stale cache entry, junk it and move on */
e7881358 764 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 765 GvCV_set(topgv, NULL);
766 cand_cv = NULL;
e1a479c5
BB		 767 GvCVGEN(topgv) = 0;
768 }
769 }
770 else if (GvCVGEN(topgv) == topgen_cmp) {
771 /* cache indicates no such method definitively */
772 return 0;
773 }
aae43805
FC		 774 else if (stash == cachestash
775 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 776 && strnEQ(hvname, "CORE", 4)
87566176 777 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 778 goto have_gv;
463ee0b2 779 }
79072805 780
aae43805 781 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 782 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
783 items = AvFILLp(linear_av); /* no +1, to skip over self */
784 while (items--) {
785 linear_sv = *linear_svp++;
786 assert(linear_sv);
787 cstash = gv_stashsv(linear_sv, 0);
788
dd69841b 789 if (!cstash) {
ecad31f0 790 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 791 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 792 SVfARG(linear_sv),
d0c0e7dd 793 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 794 continue;
795 }
9607fc9c 796
e1a479c5
BB		 797 assert(cstash);
798
c60dbbc3 799 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 800 if (!gvp) {
801 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
802 const char *hvname = HvNAME(cstash); assert(hvname);
803 if (strnEQ(hvname, "CORE", 4)
804 && (candidate =
87566176 805 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 806 ))
807 goto have_candidate;
808 }
809 continue;
810 }
811 else candidate = *gvp;
812 have_candidate:
e1a479c5 813 assert(candidate);
04f3bf56 814 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 815 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 816 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
817 /*
818 * Found real method, cache method in topgv if:
819 * 1. topgv has no synonyms (else inheritance crosses wires)
820 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
821 */
822 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 823 CV *old_cv = GvCV(topgv);
824 SvREFCNT_dec(old_cv);
e1a479c5 825 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 826 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 827 GvCVGEN(topgv) = topgen_cmp;
828 }
829 return candidate;
830 }
831 }
9607fc9c 832
e1a479c5
BB		 833 /* Check UNIVERSAL without caching */
834 if(level == 0 || level == -1) {
55df6700
FC		 835 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
836 flags &~GV_SUPER);
e1a479c5
BB		 837 if(candidate) {
838 cand_cv = GvCV(candidate);
839 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 840 CV *old_cv = GvCV(topgv);
841 SvREFCNT_dec(old_cv);
e1a479c5 842 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 843 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 844 GvCVGEN(topgv) = topgen_cmp;
845 }
846 return candidate;
847 }
848 }
849
850 if (topgv && GvREFCNT(topgv) == 1) {
851 /* cache the fact that the method is not defined */
852 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 853 }
854
79072805
LW		 855 return 0;
856}
857
c6afe666 858GV *
859Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
860{
861 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
862 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
863}
864
954c1994 865/*
460e5730
FC		 866=for apidoc gv_fetchmeth_autoload
867
868This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
869parameter.
870
d21989ed 871=for apidoc gv_fetchmeth_sv_autoload
611c1e95 872
d21989ed
BF		 873Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
874of an SV instead of a string/length pair.
875
876=cut
877*/
878
879GV *
880Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
881{
882 char *namepv;
883 STRLEN namelen;
884 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
885 namepv = SvPV(namesv, namelen);
886 if (SvUTF8(namesv))
887 flags |= SVf_UTF8;
888 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
889}
890
891/*
892=for apidoc gv_fetchmeth_pv_autoload
893
894Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
895instead of a string/length pair.
896
897=cut
898*/
899
900GV *
901Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
902{
903 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
904 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
905}
906
907/*
908=for apidoc gv_fetchmeth_pvn_autoload
909
910Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ		 911Returns a glob for the subroutine.
912
913For an autoloaded subroutine without a GV, will create a GV even
914if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
915of the result may be zero.
916
d21989ed
BF		 917Currently, the only significant value for C<flags> is SVf_UTF8.
918
611c1e95
IZ		 919=cut
920*/
921
922GV *
d21989ed 923Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 924{
499321d3 925 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 926
d21989ed 927 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 928
611c1e95 929 if (!gv) {
611c1e95
IZ		 930 CV *cv;
931 GV **gvp;
932
933 if (!stash)
6136c704 934 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 935 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 936 return NULL;
d21989ed 937 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 938 return NULL;
611c1e95
IZ		 939 cv = GvCV(gv);
940 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 941 return NULL;
611c1e95
IZ		 942 /* Have an autoload */
943 if (level < 0) /* Cannot do without a stub */
d21989ed 944 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 945 gvp = (GV**)hv_fetch(stash, name,
946 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 947 if (!gvp)
6136c704 948 return NULL;
611c1e95
IZ		 949 return *gvp;
950 }
951 return gv;
952}
953
954/*
954c1994
GS		 955=for apidoc gv_fetchmethod_autoload
956
957Returns the glob which contains the subroutine to call to invoke the method
958on the C<stash>. In fact in the presence of autoloading this may be the
959glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 960already setup.
954c1994
GS		 961
962The third parameter of C<gv_fetchmethod_autoload> determines whether
963AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 964means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 965Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 966with a non-zero C<autoload> parameter.
954c1994 967
cec2d7b1
FC		 968These functions grant C<"SUPER"> token
969as a prefix of the method name. Note
954c1994
GS		 970that if you want to keep the returned glob for a long time, you need to
971check for it being "AUTOLOAD", since at the later time the call may load a
cec2d7b1
FC		 972different subroutine due to $AUTOLOAD changing its value. Use the glob
973created as a side effect to do this.
954c1994 974
cec2d7b1
FC		 975These functions have the same side-effects as C<gv_fetchmeth> with
976C<level==0>. The warning against passing the GV returned by
977C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS		 978
979=cut
980*/
981
dc848c6f 982GV *
864dbfa3 983Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 984{
547bb267
NC		 985 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
986
256d1bb2
NC		 987 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
988}
989
44130a26
BF		 990GV *
991Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
992{
993 char *namepv;
994 STRLEN namelen;
995 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
996 namepv = SvPV(namesv, namelen);
997 if (SvUTF8(namesv))
998 flags |= SVf_UTF8;
999 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
1000}
1001
1002GV *
1003Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1004{
1005 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1006 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1007}
1008
256d1bb2
NC		 1009/* Don't merge this yet, as it's likely to get a len parameter, and possibly
1010 even a U32 hash */
1011GV *
44130a26 1012Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1013{
eb578fdb 1014 const char *nend;
c445ea15 1015 const char *nsplit = NULL;
a0d0e21e 1016 GV* gv;
0dae17bd 1017 HV* ostash = stash;
c94593d0 1018 const char * const origname = name;
ad64d0ec 1019 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 1020 const U32 autoload = flags & GV_AUTOLOAD;
1021 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1022 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1023
44130a26 1024 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1025
eff494dd 1026 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1027 stash = NULL;
c9bf4021
NC		 1028 else {
1029 /* The only way stash can become NULL later on is if nsplit is set,
1030 which in turn means that there is no need for a SVt_PVHV case
1031 the error reporting code. */
1032 }
b267980d 1033
44130a26 1034 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 1035 if (*nend == '\'') {
a0d0e21e 1036 nsplit = nend;
c94593d0
NC		 1037 name = nend + 1;
1038 }
1039 else if (*nend == ':' && *(nend + 1) == ':') {
1040 nsplit = nend++;
1041 name = nend + 1;
1042 }
a0d0e21e
LW		 1043 }
1044 if (nsplit) {
7edbdc6b 1045 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 1046 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 1047 stash = CopSTASH(PL_curcop);
1048 flags |= GV_SUPER;
cea2e8a9 1049 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1050 origname, HvENAME_get(stash), name) );
4633a7c4 1051 }
aae43805
FC		 1052 else if ((nsplit - origname) >= 7 &&
1053 strnEQ(nsplit - 7, "::SUPER", 7)) {
1054 /* don't autovifify if ->NoSuchStash::SUPER::method */
1055 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
1056 if (stash) flags |= GV_SUPER;
1057 }
e189a56d 1058 else {
af09ea45 1059 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1060 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 1061 }
0dae17bd 1062 ostash = stash;
4633a7c4
LW		 1063 }
1064
14d1dfbd 1065 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1066 if (!gv) {
2f6e0fe7 1067 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1068 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1069 else if (autoload)
c8416c26
BF		 1070 gv = gv_autoload_pvn(
1071 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1072 );
256d1bb2
NC		 1073 if (!gv && do_croak) {
1074 /* Right now this is exclusively for the benefit of S_method_common
1075 in pp_hot.c */
1076 if (stash) {
15e6cdd9
DG		 1077 /* If we can't find an IO::File method, it might be a call on
1078 * a filehandle. If IO:File has not been loaded, try to
1079 * require it first instead of croaking */
1080 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1081 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1082 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1083 STR_WITH_LEN("IO/File.pm"), 0,
1084 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1085 ) {
31b05a0f 1086 require_pv("IO/File.pm");
14d1dfbd 1087 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG		 1088 if (gv)
1089 return gv;
1090 }
256d1bb2 1091 Perl_croak(aTHX_
b17a0679 1092 "Can't locate object method \"%"UTF8f
d0c0e7dd 1093 "\" via package \"%"HEKf"\"",
b17a0679 1094 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1095 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1096 }
1097 else {
ecad31f0 1098 SV* packnamesv;
256d1bb2 1099
256d1bb2 1100 if (nsplit) {
ecad31f0
BF		 1101 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1102 SVs_TEMP | is_utf8);
256d1bb2 1103 } else {
017c5e4e 1104 packnamesv = error_report;
256d1bb2
NC		 1105 }
1106
1107 Perl_croak(aTHX_
b17a0679
FC		 1108 "Can't locate object method \"%"UTF8f
1109 "\" via package \"%"SVf"\""
ecad31f0 1110 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1111 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1112 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1113 }
1114 }
463ee0b2 1115 }
dc848c6f 1116 else if (autoload) {
9d4ba2ae 1117 CV* const cv = GvCV(gv);
09280a33
CS		 1118 if (!CvROOT(cv) && !CvXSUB(cv)) {
1119 GV* stubgv;
1120 GV* autogv;
1121
0c028dca 1122 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS		 1123 stubgv = gv;
1124 else {
1125 stubgv = CvGV(cv);
1126 if (GvCV(stubgv) != cv) /* orphaned import */
1127 stubgv = gv;
1128 }
c8416c26
BF		 1129 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1130 GvNAME(stubgv), GvNAMELEN(stubgv),
1131 GV_AUTOLOAD_ISMETHOD
1132 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1133 if (autogv)
1134 gv = autogv;
1135 }
1136 }
44a8e56a 1137
1138 return gv;
1139}
1140
1141GV*
0eeb01b9 1142Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1143{
1144 char *namepv;
1145 STRLEN namelen;
0fe84f7c 1146 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1147 namepv = SvPV(namesv, namelen);
1148 if (SvUTF8(namesv))
1149 flags |= SVf_UTF8;
0eeb01b9 1150 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1151}
1152
1153GV*
0eeb01b9 1154Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1155{
0fe84f7c 1156 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1157 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1158}
1159
1160GV*
0eeb01b9 1161Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1162{
44a8e56a 1163 GV* gv;
1164 CV* cv;
1165 HV* varstash;
1166 GV* vargv;
1167 SV* varsv;
c8416c26
BF		 1168 SV *packname = NULL;
1169 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1170
0fe84f7c 1171 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1172
7edbdc6b 1173 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1174 return NULL;
0dae17bd
GS		 1175 if (stash) {
1176 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1177 STRLEN packname_len = 0;
1178 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1179 packname = newSVpvn_flags(packname_ptr, packname_len,
1180 SVs_TEMP | SvUTF8(stash));
5c284bb0 1181 stash = NULL;
0dae17bd 1182 }
c8416c26
BF		 1183 else
1184 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1185 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1186 }
257dc59d
FC		 1187 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1188 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1189 return NULL;
dc848c6f 1190 cv = GvCV(gv);
1191
adb5a9ae 1192 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1193 return NULL;
ed850460 1194
dc848c6f 1195 /*
1196 * Inheriting AUTOLOAD for non-methods works ... for now.
1197 */
0eeb01b9
FC		 1198 if (
1199 !(flags & GV_AUTOLOAD_ISMETHOD)
1200 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1201 )
d1d15184 1202 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC		 1203 "Use of inherited AUTOLOAD for non-method %"SVf
1204 "::%"UTF8f"() is deprecated",
ecad31f0 1205 SVfARG(packname),
b17a0679 1206 UTF8fARG(is_utf8, len, name));
44a8e56a 1207
aed2304a 1208 if (CvISXSUB(cv)) {
bb619f37
FC		 1209 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1210 * and split that value on the last '::', pass along the same data
1211 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1212 *
1213 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1214 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1215 * type. Since SvPVX has been documented as returning the sub name
1216 * for a long time, but not as returning the prototype, we have
1217 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1218 * elsewhere.
1219 *
1220 * We put the prototype in the same allocated buffer, but after
1221 * the sub name. The SvPOK flag indicates the presence of a proto-
1222 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1223 * If both flags are on, then SvLEN is used to indicate the end of
1224 * the prototype (artificially lower than what is actually allo-
1225 * cated), at the risk of having to reallocate a few bytes unneces-
1226 * sarily--but that should happen very rarely, if ever.
1227 *
1228 * We use SvUTF8 for both prototypes and sub names, so if one is
1229 * UTF8, the other must be upgraded.
adb5a9ae 1230 */
c68d9564 1231 CvSTASH_set(cv, stash);
8fa6a409 1232 if (SvPOK(cv)) { /* Ouch! */
e7881358 1233 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1234 STRLEN ulen;
1235 const char *proto = CvPROTO(cv);
1236 assert(proto);
1237 if (SvUTF8(cv))
1238 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1239 ulen = SvCUR(tmpsv);
1240 SvCUR(tmpsv)++; /* include null in string */
1241 sv_catpvn_flags(
1242 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1243 );
1244 SvTEMP_on(tmpsv); /* Allow theft */
1245 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1246 SvTEMP_off(tmpsv);
e7881358 1247 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1248 SvLEN(cv) = SvCUR(cv) + 1;
1249 SvCUR(cv) = ulen;
1250 }
1251 else {
1252 sv_setpvn((SV *)cv, name, len);
1253 SvPOK_off(cv);
1254 if (is_utf8)
c8416c26 1255 SvUTF8_on(cv);
8fa6a409
FC		 1256 else SvUTF8_off(cv);
1257 }
1258 CvAUTOLOAD_on(cv);
adb5a9ae 1259 }
adb5a9ae 1260
44a8e56a 1261 /*
1262 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1263 * The subroutine's original name may not be "AUTOLOAD", so we don't
1264 * use that, but for lack of anything better we will use the sub's
1265 * original package to look up $AUTOLOAD.
1266 */
18691622 1267 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1268 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1269 ENTER;
1270
c69033f2 1271 if (!isGV(vargv)) {
04ec7e59 1272 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1273#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1274 GvSV(vargv) = newSV(0);
c69033f2
NC		 1275#endif
1276 }
3d35f11b 1277 LEAVE;
e203899d 1278 varsv = GvSVn(vargv);
4bac9ae4
CS		 1279 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1280 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1281 sv_setsv(varsv, packname);
396482e1 1282 sv_catpvs(varsv, "::");
d40bf27b
NC		 1283 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1284 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1285 sv_catpvn_flags(
1286 varsv, name, len,
5bcd1ef4 1287 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1288 );
c8416c26
BF		 1289 if (is_utf8)
1290 SvUTF8_on(varsv);
a0d0e21e
LW		 1291 return gv;
1292}
1293
44a2ac75
YO		 1294
1295/* require_tie_mod() internal routine for requiring a module
486ec47a 1296 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO		 1297 *
1298 * The "gv" parameter should be the glob.
45cbc99a
RGS		 1299 * "varpv" holds the name of the var, used for error messages.
1300 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1301 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1302 * are working reasonably close to as expected.
1303 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1304 * For the protection of $! to work (it is set by this routine)
1305 * the sv slot must already be magicalized.
d2c93421 1306 */
44a2ac75
YO		 1307STATIC HV*
1308S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1309{
da51bb9b 1310 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1311
7918f24d
NC		 1312 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1313
0ea03996 1314 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1315 SV *module = newSVsv(namesv);
1316 char varname = *varpv; /* varpv might be clobbered by load_module,
1317 so save it. For the moment it's always
1318 a single char. */
b82b06b8 1319 const char type = varname == '[' ? '$' : '%';
61bac25c 1320#ifdef DEBUGGING
d2c93421 1321 dSP;
61bac25c 1322#endif
d2c93421 1323 ENTER;
600beb2e 1324 SAVEFREESV(namesv);
44a2ac75 1325 if ( flags & 1 )
45cbc99a
RGS		 1326 save_scalar(gv);
1327 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1328 assert(sp == PL_stack_sp);
da51bb9b 1329 stash = gv_stashsv(namesv, 0);
44a2ac75 1330 if (!stash)
b82b06b8
FC		 1331 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1332 type, varname, SVfARG(namesv));
45cbc99a 1333 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1334 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1335 type, varname, SVfARG(namesv), methpv);
600beb2e 1336 LEAVE;
d2c93421 1337 }
e7881358 1338 else SvREFCNT_dec_NN(namesv);
44a2ac75 1339 return stash;
d2c93421
RH		 1340}
1341
954c1994
GS		 1342/*
1343=for apidoc gv_stashpv
1344
da51bb9b 1345Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1346determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1347
1348=cut
1349*/
1350
a0d0e21e 1351HV*
864dbfa3 1352Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1353{
7918f24d 1354 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1355 return gv_stashpvn(name, strlen(name), create);
1356}
1357
bc96cb06
SH		 1358/*
1359=for apidoc gv_stashpvn
1360
da51bb9b
NC		 1361Returns a pointer to the stash for a specified package. The C<namelen>
1362parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1363to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1364created if it does not already exist. If the package does not exist and
1365C<flags> is 0 (or any other setting that does not create packages) then NULL
1366is returned.
1367
566a4718
YO		 1368Flags may be one of:
1369
1370 GV_ADD
1371 SVf_UTF8
1372 GV_NOADD_NOINIT
1373 GV_NOINIT
1374 GV_NOEXPAND
1375 GV_ADDMG
1376
1377The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06 1378
808724c8 1379Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1380recommended for performance reasons.
1381
bc96cb06
SH		 1382=cut
1383*/
1384
0eadbdad
YO		 1385/*
1386gv_stashpvn_internal
1387
1388Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1389as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1390
1391*/
1392
4e7ebec5 1393PERL_STATIC_INLINE HV*
0eadbdad 1394S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1395{
0cea0058 1396 char smallbuf[128];
46fc3d4c 1397 char *tmpbuf;
a0d0e21e
LW		 1398 HV *stash;
1399 GV *tmpgv;
add0ecde 1400 U32 tmplen = namelen + 2;
dc437b57 1401
0eadbdad 1402 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1403
add0ecde 1404 if (tmplen <= sizeof smallbuf)
46fc3d4c 1405 tmpbuf = smallbuf;
1406 else
add0ecde
VP		 1407 Newx(tmpbuf, tmplen, char);
1408 Copy(name, tmpbuf, namelen, char);
1409 tmpbuf[namelen] = ':';
1410 tmpbuf[namelen+1] = ':';
1411 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1412 if (tmpbuf != smallbuf)
1413 Safefree(tmpbuf);
a0d0e21e 1414 if (!tmpgv)
da51bb9b 1415 return NULL;
a0d0e21e 1416 stash = GvHV(tmpgv);
1f656fcf 1417 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1418 assert(stash);
1f656fcf 1419 if (!HvNAME_get(stash)) {
0be4d16f 1420 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1421
1422 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1423 /* If the containing stash has multiple effective
1424 names, see that this one gets them, too. */
1425 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1426 mro_package_moved(stash, NULL, tmpgv, 1);
1427 }
a0d0e21e 1428 return stash;
463ee0b2
LW		 1429}
1430
808724c8 1431/*
1432gv_stashsvpvn_cached
1433
1434Returns a pointer to the stash for a specified package, possibly
1435cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1436
1437Requires one of either namesv or namepv to be non-null.
1438
1439See C<gv_stashpvn> for details on "flags".
1440
1441Note the sv interface is strongly preferred for performance reasons.
1442
1443*/
1444
1445#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1446 assert(namesv || name)
1447
1448PERL_STATIC_INLINE HV*
1449S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1450{
1451 HV* stash;
808724c8 1452 HE* he;
1453
1454 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1455
1456 he = (HE *)hv_common(
1457 PL_stashcache, namesv, name, namelen,
4e7ebec5 1458 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1459 );
808724c8 1460
4e7ebec5 1461 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1462 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1463
808724c8 1464 if (namesv) {
1465 if (SvOK(namesv)) { /* prevent double uninit warning */
1466 STRLEN len;
1467 name = SvPV_const(namesv, len);
1468 namelen = len;
1469 flags |= SvUTF8(namesv);
1470 } else {
1471 name = ""; namelen = 0;
1472 }
1473 }
0eadbdad
YO		 1474 stash = gv_stashpvn_internal(name, namelen, flags);
1475
4e7ebec5 1476 if (stash && namelen) {
1477 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1478 (void)hv_store(PL_stashcache, name,
4e7ebec5 1479 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1480 }
808724c8 1481
4e7ebec5 1482 return stash;
1483}
1484
808724c8 1485HV*
1486Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1487{
1488 PERL_ARGS_ASSERT_GV_STASHPVN;
1489 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1490}
1491
954c1994
GS		 1492/*
1493=for apidoc gv_stashsv
1494
da51bb9b 1495Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994 1496
808724c8 1497Note this interface is strongly preferred over C<gv_stashpvn> for performance reasons.
1498
954c1994
GS		 1499=cut
1500*/
1501
a0d0e21e 1502HV*
da51bb9b 1503Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1504{
7918f24d 1505 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1506 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW		 1507}
1508
1509
463ee0b2 1510GV *
fe9845cc 1511Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1512 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1513 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1514}
1515
1516GV *
fe9845cc 1517Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1518 STRLEN len;
77cb3b01
FC		 1519 const char * const nambeg =
1520 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1521 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1522 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1523}
1524
90aeefb4 1525PERL_STATIC_INLINE void
290a1700 1526S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1527{
1528 AV* av;
1529
1530 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1531
1532 av = GvAVn(gv);
1533 GvMULTI_on(gv);
1534 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1535 NULL, 0);
ad7cce9f
FR		 1536}
1537
90aeefb4
BF		 1538/* This function grabs name and tries to split a stash and glob
1539 * from its contents. TODO better description, comments
1540 *
1541 * If the function returns TRUE and 'name == name_end', then
1542 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1543 */
1544PERL_STATIC_INLINE bool
1545S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1546 STRLEN *len, const char *nambeg, STRLEN full_len,
1547 const U32 is_utf8, const I32 add)
1548{
1549 const char *name_cursor;
1550 const char *const name_end = nambeg + full_len;
1551 const char *const name_em1 = name_end - 1;
1552
1553 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1554
1555 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1556 /* accidental stringify on a GV? */
1557 (*name)++;
1558 }
1559
1560 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1561 if (name_cursor < name_em1 &&
1562 ((*name_cursor == ':' && name_cursor[1] == ':')
1563 || *name_cursor == '\''))
1564 {
1565 if (!*stash)
1566 *stash = PL_defstash;
1567 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1568 return FALSE;
1569
1570 *len = name_cursor - *name;
1571 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1572 const char *key;
1573 GV**gvp;
1574 if (*name_cursor == ':') {
1575 key = *name;
1576 *len += 2;
1577 }
1578 else {
1579 char *tmpbuf;
1580 Newx(tmpbuf, *len+2, char);
1581 Copy(*name, tmpbuf, *len, char);
1582 tmpbuf[(*len)++] = ':';
1583 tmpbuf[(*len)++] = ':';
1584 key = tmpbuf;
1585 }
c161da64 1586 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF		 1587 *gv = gvp ? *gvp : NULL;
1588 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1589 if (SvTYPE(*gv) != SVt_PVGV)
1590 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1591 else
1592 GvMULTI_on(*gv);
1593 }
1594 if (key != *name)
1595 Safefree(key);
1596 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1597 return FALSE;
1598
1599 if (!(*stash = GvHV(*gv))) {
1600 *stash = GvHV(*gv) = newHV();
1601 if (!HvNAME_get(*stash)) {
1602 if (GvSTASH(*gv) == PL_defstash && *len == 6
1603 && strnEQ(*name, "CORE", 4))
1604 hv_name_set(*stash, "CORE", 4, 0);
1605 else
1606 hv_name_set(
1607 *stash, nambeg, name_cursor-nambeg, is_utf8
1608 );
1609 /* If the containing stash has multiple effective
1610 names, see that this one gets them, too. */
1611 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1612 mro_package_moved(*stash, NULL, *gv, 1);
1613 }
1614 }
1615 else if (!HvNAME_get(*stash))
1616 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1617 }
1618
1619 if (*name_cursor == ':')
1620 name_cursor++;
1621 *name = name_cursor+1;
1622 if (*name == name_end) {
1623 if (!*gv)
1624 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1625 return TRUE;
1626 }
1627 }
1628 }
1629 *len = name_cursor - *name;
1630 return TRUE;
1631}
1632
536d1a88 1633/* Checks if an unqualified name is in the main stash */
90aeefb4 1634PERL_STATIC_INLINE bool
536d1a88 1635S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1636{
536d1a88 1637 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1638
90aeefb4 1639 /* If it's an alphanumeric variable */
536d1a88 1640 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF		 1641 /* Some "normal" variables are always in main::,
1642 * like INC or STDOUT.
1643 */
1644 switch (len) {
1645 case 1:
1646 if (*name == '_')
536d1a88 1647 return TRUE;
90aeefb4
BF		 1648 break;
1649 case 3:
1650 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1651 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1652 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1653 return TRUE;
90aeefb4
BF		 1654 break;
1655 case 4:
1656 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1657 && name[3] == 'V')
536d1a88 1658 return TRUE;
90aeefb4
BF		 1659 break;
1660 case 5:
1661 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1662 && name[3] == 'I' && name[4] == 'N')
536d1a88 1663 return TRUE;
90aeefb4
BF		 1664 break;
1665 case 6:
1666 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1667 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1668 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1669 return TRUE;
90aeefb4
BF		 1670 break;
1671 case 7:
1672 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1673 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1674 && name[6] == 'T')
536d1a88 1675 return TRUE;
90aeefb4
BF		 1676 break;
1677 }
536d1a88
BF		 1678 }
1679 /* *{""}, or a special variable like $@ */
1680 else
1681 return TRUE;
1682
1683 return FALSE;
1684}
1685
1686
1687/* This function is called if parse_gv_stash_name() failed to
1688 * find a stash, or if GV_NOTQUAL or an empty name was passed
1689 * to gv_fetchpvn_flags.
1690 *
1691 * It returns FALSE if the default stash can't be found nor created,
1692 * which might happen during global destruction.
1693 */
1694PERL_STATIC_INLINE bool
1695S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1696 const U32 is_utf8, const I32 add,
1697 const svtype sv_type)
1698{
1699 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1700
1701 /* No stash in name, so see how we can default */
90aeefb4 1702
536d1a88
BF		 1703 if ( gv_is_in_main(name, len, is_utf8) ) {
1704 *stash = PL_defstash;
1705 }
1706 else {
1707 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1708 *stash = PL_curstash;
1709 if (add && (PL_hints & HINT_STRICT_VARS) &&
1710 sv_type != SVt_PVCV &&
1711 sv_type != SVt_PVGV &&
1712 sv_type != SVt_PVFM &&
1713 sv_type != SVt_PVIO &&
1714 !(len == 1 && sv_type == SVt_PV &&
1715 (*name == 'a' || *name == 'b')) )
1716 {
c161da64 1717 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1718 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1719 SvTYPE(*gvp) != SVt_PVGV)
1720 {
1721 *stash = NULL;
1722 }
1723 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1724 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1725 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1726 {
1727 /* diag_listed_as: Variable "%s" is not imported%s */
1728 Perl_ck_warner_d(
1729 aTHX_ packWARN(WARN_MISC),
1730 "Variable \"%c%"UTF8f"\" is not imported",
1731 sv_type == SVt_PVAV ? '@' :
1732 sv_type == SVt_PVHV ? '%' : '$',
1733 UTF8fARG(is_utf8, len, name));
1734 if (GvCVu(*gvp))
1735 Perl_ck_warner_d(
1736 aTHX_ packWARN(WARN_MISC),
1737 "\t(Did you mean &%"UTF8f" instead?)\n",
1738 UTF8fARG(is_utf8, len, name)
1739 );
1740 *stash = NULL;
1741 }
1742 }
1743 }
1744 else {
1745 /* Use the current op's stash */
1746 *stash = CopSTASH(PL_curcop);
1747 }
1748 }
90aeefb4
BF		 1749
1750 if (!*stash) {
1751 if (add && !PL_in_clean_all) {
10860bf4
FC		 1752 GV *gv;
1753 qerror(Perl_mess(aTHX_
90aeefb4 1754 "Global symbol \"%s%"UTF8f
d8c6310a
FC		 1755 "\" requires explicit package name (did you forget to "
1756 "declare \"my %s%"UTF8f"\"?)",
1757 (sv_type == SVt_PV ? "$"
1758 : sv_type == SVt_PVAV ? "@"
1759 : sv_type == SVt_PVHV ? "%"
1760 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF		 1761 (sv_type == SVt_PV ? "$"
1762 : sv_type == SVt_PVAV ? "@"
1763 : sv_type == SVt_PVHV ? "%"
10860bf4 1764 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF		 1765 /* To maintain the output of errors after the strict exception
1766 * above, and to keep compat with older releases, rather than
1767 * placing the variables in the pad, we place
1768 * them in the <none>:: stash.
1769 */
90aeefb4
BF		 1770 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1771 if (!gv) {
1772 /* symbol table under destruction */
1773 return FALSE;
1774 }
1775 *stash = GvHV(gv);
1776 }
1777 else
1778 return FALSE;
1779 }
1780
1781 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1782 return FALSE;
1783
1784 return TRUE;
1785}
1786
8c995aba
FC		 1787/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1788 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1789 this file. */
1790#undef SvREADONLY_on
1791#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1792
930867a8
BF		 1793/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1794 * a new GV.
1795 * Note that it does not insert the GV into the stash prior to
1796 * magicalization, which some variables require need in order
1797 * to work (like $[, %+, %-, %!), so callers must take care of
1798 * that beforehand.
1799 *
1800 * The return value has a specific meaning for gv_fetchpvn_flags:
1801 * If it returns true, and the gv is empty, it indicates that its
1802 * refcount should be decreased.
1803 */
1804PERL_STATIC_INLINE bool
1805S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1806 bool addmg, const svtype sv_type)
79072805 1807{
960b831f 1808 SSize_t paren;
79072805 1809
930867a8 1810 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1811
44428a46 1812 if (stash != PL_defstash) { /* not the main stash */
ea238638 1813 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1814 and VERSION. All the others apply only to the main stash or to
1815 CORE (which is checked right after this). */
ea238638 1816 if (len) {
b464bac0 1817 const char * const name2 = name + 1;
cc4c2da6 1818 switch (*name) {
cc4c2da6
NC		 1819 case 'E':
1820 if (strnEQ(name2, "XPORT", 5))
1821 GvMULTI_on(gv);
1822 break;
1823 case 'I':
44428a46 1824 if (strEQ(name2, "SA"))
290a1700 1825 gv_magicalize_isa(gv);
cc4c2da6 1826 break;
44428a46
FC		 1827 case 'V':
1828 if (strEQ(name2, "ERSION"))
1829 GvMULTI_on(gv);
1830 break;
ea238638
FC		 1831 case 'a':
1832 case 'b':
1833 if (len == 1 && sv_type == SVt_PV)
1834 GvMULTI_on(gv);
924ba076 1835 /* FALLTHROUGH */
4aaa4757
FC		 1836 default:
1837 goto try_core;
1838 }
930867a8 1839 return addmg;
4aaa4757
FC		 1840 }
1841 try_core:
1842 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1843 /* Avoid null warning: */
1844 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1845 if (strnEQ(stashname, "CORE", 4))
1846 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1847 }
1848 }
1849 else if (len > 1) {
1850#ifndef EBCDIC
1851 if (*name > 'V' ) {
1852 NOOP;
1853 /* Nothing else to do.
1854 The compiler will probably turn the switch statement into a
1855 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1856 the common case of lower case variable names. (On EBCDIC
1857 platforms, we can't just do:
1858 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1859 because cases like '\027' in the switch statement below are
1860 C1 (non-ASCII) controls on those platforms, so the remapping
1861 would make them larger than 'V')
1862 */
44428a46
FC		 1863 } else
1864#endif
1865 {
3e669301 1866 const char * name2 = name + 1;
44428a46
FC		 1867 switch (*name) {
1868 case 'A':
1869 if (strEQ(name2, "RGV")) {
1870 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1871 }
1872 else if (strEQ(name2, "RGVOUT")) {
1873 GvMULTI_on(gv);
1874 }
1875 break;
1876 case 'E':
1877 if (strnEQ(name2, "XPORT", 5))
1878 GvMULTI_on(gv);
1879 break;
1880 case 'I':
1881 if (strEQ(name2, "SA")) {
290a1700 1882 gv_magicalize_isa(gv);
44428a46
FC		 1883 }
1884 break;
cc4c2da6
NC		 1885 case 'S':
1886 if (strEQ(name2, "IG")) {
1887 HV *hv;
1888 I32 i;
d525a7b2
NC		 1889 if (!PL_psig_name) {
1890 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1891 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1892 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1893 } else {
1894 /* I think that the only way to get here is to re-use an
1895 embedded perl interpreter, where the previous
1896 use didn't clean up fully because
1897 PL_perl_destruct_level was 0. I'm not sure that we
1898 "support" that, in that I suspect in that scenario
1899 there are sufficient other garbage values left in the
1900 interpreter structure that something else will crash
1901 before we get here. I suspect that this is one of
1902 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1903 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1904 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1905 }
1906 GvMULTI_on(gv);
1907 hv = GvHVn(gv);
a0714e2c 1908 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1909 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1910 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1911 if (init)
1912 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1913 }
1914 }
1915 break;
1916 case 'V':
1917 if (strEQ(name2, "ERSION"))
1918 GvMULTI_on(gv);
1919 break;
e5218da5
GA		 1920 case '\003': /* $^CHILD_ERROR_NATIVE */
1921 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1922 goto magicalize;
1923 break;
cc4c2da6 1924 case '\005': /* $^ENCODING */
3e669301
KW		 1925 if (*name2 == '_') {
1926 name2++;
1927 }
cc4c2da6
NC		 1928 if (strEQ(name2, "NCODING"))
1929 goto magicalize;
1930 break;
9ebf26ad
FR		 1931 case '\007': /* $^GLOBAL_PHASE */
1932 if (strEQ(name2, "LOBAL_PHASE"))
1933 goto ro_magicalize;
1934 break;
8561ea1d
FC		 1935 case '\014': /* $^LAST_FH */
1936 if (strEQ(name2, "AST_FH"))
1937 goto ro_magicalize;
1938 break;
cde0cee5 1939 case '\015': /* $^MATCH */
960b831f
NC		 1940 if (strEQ(name2, "ATCH")) {
1941 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1942 goto storeparen;
1943 }
66230c86 1944 break;
cc4c2da6
NC		 1945 case '\017': /* $^OPEN */
1946 if (strEQ(name2, "PEN"))
1947 goto magicalize;
1948 break;
cde0cee5 1949 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC		 1950 if (strEQ(name2, "REMATCH")) {
1951 paren = RX_BUFF_IDX_CARET_PREMATCH;
1952 goto storeparen;
1953 }
1954 if (strEQ(name2, "OSTMATCH")) {
1955 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1956 goto storeparen;
1957 }
9ebf26ad 1958 break;
cc4c2da6
NC		 1959 case '\024': /* ${^TAINT} */
1960 if (strEQ(name2, "AINT"))
1961 goto ro_magicalize;
1962 break;
7cebcbc0 1963 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1964 if (strEQ(name2, "NICODE"))
cc4c2da6 1965 goto ro_magicalize;
a0288114 1966 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1967 goto ro_magicalize;
e07ea26a
NC		 1968 if (strEQ(name2, "TF8CACHE"))
1969 goto magicalize;
cc4c2da6
NC		 1970 break;
1971 case '\027': /* $^WARNING_BITS */
1972 if (strEQ(name2, "ARNING_BITS"))
1973 goto magicalize;
1974 break;
1975 case '1':
1976 case '2':
1977 case '3':
1978 case '4':
1979 case '5':
1980 case '6':
1981 case '7':
1982 case '8':
1983 case '9':
85e6fe83 1984 {
2fdbfb4d
AB		 1985 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1986 this test */
1987 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC		 1988 const char *end = name + len;
1989 while (--end > name) {
930867a8
BF		 1990 if (!isDIGIT(*end))
1991 return addmg;
cc4c2da6 1992 }
99944878 1993 paren = grok_atou(name, NULL);
960b831f 1994 goto storeparen;
1d7c1841 1995 }
dc437b57 1996 }
93a17b20 1997 }
392db708
NC		 1998 } else {
1999 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2000 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2001 switch (*name) {
6361f656 2002 case '&': /* $& */
960b831f
NC		 2003 paren = RX_BUFF_IDX_FULLMATCH;
2004 goto sawampersand;
6361f656 2005 case '`': /* $` */
960b831f
NC		 2006 paren = RX_BUFF_IDX_PREMATCH;
2007 goto sawampersand;
6361f656 2008 case '\'': /* $' */
960b831f
NC		 2009 paren = RX_BUFF_IDX_POSTMATCH;
2010 sawampersand:
1a904fc8 2011#ifdef PERL_SAWAMPERSAND
a289ef89 2012 if (!(
cc4c2da6
NC		 2013 sv_type == SVt_PVAV ||
2014 sv_type == SVt_PVHV ||
2015 sv_type == SVt_PVCV ||
2016 sv_type == SVt_PVFM ||
2017 sv_type == SVt_PVIO
d3b97530
DM		 2018 )) { PL_sawampersand |=
2019 (*name == '`')
2020 ? SAWAMPERSAND_LEFT
2021 : (*name == '&')
2022 ? SAWAMPERSAND_MIDDLE
2023 : SAWAMPERSAND_RIGHT;
2024 }
1a904fc8 2025#endif
960b831f 2026 goto storeparen;
e91d8259
NC		 2027 case '1': /* $1 */
2028 case '2': /* $2 */
2029 case '3': /* $3 */
2030 case '4': /* $4 */
2031 case '5': /* $5 */
2032 case '6': /* $6 */
2033 case '7': /* $7 */
2034 case '8': /* $8 */
2035 case '9': /* $9 */
960b831f
NC		 2036 paren = *name - '0';
2037
2038 storeparen:
e91d8259
NC		 2039 /* Flag the capture variables with a NULL mg_ptr
2040 Use mg_len for the array index to lookup. */
960b831f 2041 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2042 break;
cc4c2da6 2043
6361f656 2044 case ':': /* $: */
c69033f2 2045 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 2046 goto magicalize;
2047
6361f656 2048 case '?': /* $? */
ff0cee69 2049#ifdef COMPLEX_STATUS
c69033f2 2050 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2051#endif
cc4c2da6 2052 goto magicalize;
ff0cee69 2053
6361f656 2054 case '!': /* $! */
67261566 2055 GvMULTI_on(gv);
44a2ac75 2056 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2057
ad64d0ec 2058 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2059
44a2ac75 2060 /* magicalization must be done before require_tie_mod is called */
67261566 2061 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 2062 {
44a2ac75 2063 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 2064 addmg = FALSE;
ffdb8bcd 2065 }
d2c93421 2066
6cef1e77 2067 break;
6361f656
AB		 2068 case '-': /* $- */
2069 case '+': /* $+ */
44a2ac75
YO		 2070 GvMULTI_on(gv); /* no used once warnings here */
2071 {
44a2ac75 2072 AV* const av = GvAVn(gv);
ad64d0ec 2073 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2074
ad64d0ec
NC		 2075 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2076 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2077 if (avc)
44a2ac75 2078 SvREADONLY_on(GvSVn(gv));
44a2ac75 2079 SvREADONLY_on(av);
67261566
YO		 2080
2081 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 2082 {
192b9cd1 2083 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 2084 addmg = FALSE;
213084e4 2085 }
67261566 2086
80305961 2087 break;
cc4c2da6 2088 }
6361f656
AB		 2089 case '*': /* $* */
2090 case '#': /* $# */
9b387841 2091 if (sv_type == SVt_PV)
4f650b80 2092 /* diag_listed_as: $* is no longer supported */
9b387841 2093 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2094 "$%c is no longer supported", *name);
8ae1fe26 2095 break;
b3ca2e83
NC		 2096 case '\010': /* $^H */
2097 {
2098 HV *const hv = GvHVn(gv);
2099 hv_magic(hv, NULL, PERL_MAGIC_hints);
2100 }
2101 goto magicalize;
b82b06b8 2102 case '[': /* $[ */
7d69d4a6 2103 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2104 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 2105 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 2106 addmg = FALSE;
b82b06b8 2107 }
7d69d4a6 2108 else goto magicalize;
b82b06b8 2109 break;
cc4c2da6 2110 case '\023': /* $^S */
2fdbfb4d
AB		 2111 ro_magicalize:
2112 SvREADONLY_on(GvSVn(gv));
924ba076 2113 /* FALLTHROUGH */
6361f656 2114 case '0': /* $0 */
6361f656
AB		 2115 case '^': /* $^ */
2116 case '~': /* $~ */
2117 case '=': /* $= */
2118 case '%': /* $% */
2119 case '.': /* $. */
2120 case '(': /* $( */
2121 case ')': /* $) */
2122 case '<': /* $< */
2123 case '>': /* $> */
2124 case '\\': /* $\ */
2125 case '/': /* $/ */
4505a31f 2126 case '|': /* $| */
9cdac2a2 2127 case '$': /* $$ */
cc4c2da6
NC		 2128 case '\001': /* $^A */
2129 case '\003': /* $^C */
2130 case '\004': /* $^D */
2131 case '\005': /* $^E */
2132 case '\006': /* $^F */
cc4c2da6
NC		 2133 case '\011': /* $^I, NOT \t in EBCDIC */
2134 case '\016': /* $^N */
2135 case '\017': /* $^O */
2136 case '\020': /* $^P */
2137 case '\024': /* $^T */
2138 case '\027': /* $^W */
2139 magicalize:
ad64d0ec 2140 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2141 break;
e521374c 2142
cc4c2da6 2143 case '\014': /* $^L */
76f68e9b 2144 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2145 break;
6361f656 2146 case ';': /* $; */
76f68e9b 2147 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2148 break;
6361f656 2149 case ']': /* $] */
cc4c2da6 2150 {
3638bf15 2151 SV * const sv = GvSV(gv);
d7aa5382 2152 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2153 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2154 GvSV(gv) = vnumify(PL_patchlevel);
2155 SvREADONLY_on(GvSV(gv));
2156 SvREFCNT_dec(sv);
93a17b20
LW		 2157 }
2158 break;
cc4c2da6
NC		 2159 case '\026': /* $^V */
2160 {
3638bf15 2161 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2162 GvSV(gv) = new_version(PL_patchlevel);
2163 SvREADONLY_on(GvSV(gv));
2164 SvREFCNT_dec(sv);
16070b82
GS		 2165 }
2166 break;
ea238638
FC		 2167 case 'a':
2168 case 'b':
dc3e91f6 2169 if (sv_type == SVt_PV)
ea238638 2170 GvMULTI_on(gv);
cc4c2da6 2171 }
79072805 2172 }
930867a8
BF		 2173
2174 return addmg;
71c35c05
BF		 2175}
2176
8c995aba
FC		 2177/* If we do ever start using this later on in the file, we need to make
2178 sure we don’t accidentally use the wrong definition. */
2179#undef SvREADONLY_on
2180
070dc475
BF		 2181/* This function is called when the stash already holds the GV of the magic
2182 * variable we're looking for, but we need to check that it has the correct
2183 * kind of magic. For example, if someone first uses $! and then %!, the
2184 * latter would end up here, and we add the Errno tie to the HASH slot of
2185 * the *! glob.
2186 */
2187PERL_STATIC_INLINE void
2188S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2189{
2190 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2191
2192 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2193 if (*name == '!')
2194 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2195 else if (*name == '-' || *name == '+')
2196 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2197 } else if (sv_type == SVt_PV) {
2198 if (*name == '*' || *name == '#') {
2199 /* diag_listed_as: $* is no longer supported */
2200 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2201 WARN_SYNTAX),
2202 "$%c is no longer supported", *name);
2203 }
2204 }
2205 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2206 switch (*name) {
2207 case '[':
2208 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2209 break;
2210#ifdef PERL_SAWAMPERSAND
2211 case '`':
2212 PL_sawampersand |= SAWAMPERSAND_LEFT;
2213 (void)GvSVn(gv);
2214 break;
2215 case '&':
2216 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2217 (void)GvSVn(gv);
2218 break;
2219 case '\'':
2220 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2221 (void)GvSVn(gv);
2222 break;
2223#endif
2224 }
2225 }
2226}
2227
71c35c05
BF		 2228GV *
2229Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2230 const svtype sv_type)
2231{
71c35c05
BF		 2232 const char *name = nambeg;
2233 GV *gv = NULL;
2234 GV**gvp;
2235 STRLEN len;
2236 HV *stash = NULL;
2237 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2238 const I32 no_expand = flags & GV_NOEXPAND;
2239 const I32 add = flags & ~GV_NOADD_MASK;
2240 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2241 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2242 const char *const name_end = nambeg + full_len;
2243 U32 faking_it;
2244
2245 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2246
2247 /* If we have GV_NOTQUAL, the caller promised that
2248 * there is no stash, so we can skip the check.
2249 * Similarly if full_len is 0, since then we're
2250 * dealing with something like *{""} or ""->foo()
2251 */
2252 if ((flags & GV_NOTQUAL) || !full_len) {
2253 len = full_len;
2254 }
2255 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2256 if (name == name_end) return gv;
2257 }
2258 else {
2259 return NULL;
2260 }
2261
2262 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2263 return NULL;
2264 }
2265
2266 /* By this point we should have a stash and a name */
c161da64 2267 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2268 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2269 if (addmg) gv = (GV *)newSV(0);
2270 else return NULL;
2271 }
2272 else gv = *gvp, addmg = 0;
2273 /* From this point on, addmg means gv has not been inserted in the
2274 symtab yet. */
2275
2276 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2277 /* The GV already exists, so return it, but check if we need to do
2278 * anything else with it before that.
2279 */
71c35c05 2280 if (add) {
c002ae9a
BF		 2281 /* This is the heuristic that handles if a variable triggers the
2282 * 'used only once' warning. If there's already a GV in the stash
2283 * with this name, then we assume that the variable has been used
2284 * before and turn its MULTI flag on.
2285 * It's a heuristic because it can easily be "tricked", like with
2286 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2287 * not warning about $main::foo being used just once
2288 */
71c35c05
BF		 2289 GvMULTI_on(gv);
2290 gv_init_svtype(gv, sv_type);
2291 /* You reach this path once the typeglob has already been created,
2292 either by the same or a different sigil. If this path didn't
2293 exist, then (say) referencing $! first, and %! second would
2294 mean that %! was not handled correctly. */
2295 if (len == 1 && stash == PL_defstash) {
070dc475 2296 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2297 }
2298 else if (len == 3 && sv_type == SVt_PVAV
2299 && strnEQ(name, "ISA", 3)
2300 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2301 gv_magicalize_isa(gv);
2302 }
2303 return gv;
2304 } else if (no_init) {
2305 assert(!addmg);
2306 return gv;
c002ae9a
BF		 2307 }
2308 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2309 * don't expand it to a glob. This is an optimization so that things
2310 * copying constants over, like Exporter, don't have to be rewritten
2311 * to take into account that you can store more than just globs in
2312 * stashes.
2313 */
2314 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2315 assert(!addmg);
2316 return gv;
2317 }
2318
2319 /* Adding a new symbol.
2320 Unless of course there was already something non-GV here, in which case
2321 we want to behave as if there was always a GV here, containing some sort
2322 of subroutine.
2323 Otherwise we run the risk of creating things like GvIO, which can cause
2324 subtle bugs. eg the one that tripped up SQL::Translator */
2325
2326 faking_it = SvOK(gv);
2327
2328 if (add & GV_ADDWARN)
2329 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2330 "Had to create %"UTF8f" unexpectedly",
2331 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2332 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2333
9e5de6ae 2334 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2335 GvMULTI_on(gv) ;
2336
930867a8
BF		 2337 /* First, store the gv in the symtab if we're adding magic,
2338 * but only for non-empty GVs
2339 */
2340#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2341 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2342
2343 if ( addmg && !GvEMPTY(gv) ) {
2344 (void)hv_store(stash,name,len,(SV *)gv,0);
2345 }
2346
71c35c05 2347 /* set up magic where warranted */
930867a8
BF		 2348 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2349 /* See 23496c6 */
2350 if (GvEMPTY(gv)) {
2351 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2352 /* The GV was and still is "empty", except that now
2353 * it has the magic flags turned on, so we want it
2354 * stored in the symtab.
2355 */
2356 (void)hv_store(stash,name,len,(SV *)gv,0);
2357 }
2358 else {
2359 /* Most likely the temporary GV created above */
2360 SvREFCNT_dec_NN(gv);
2361 gv = NULL;
2362 }
2363 }
2364 }
71c35c05 2365
e6066781 2366 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2367 return gv;
79072805
LW		 2368}
2369
2370void
35a4481c 2371Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2372{
ed60a868 2373 const char *name;
35a4481c 2374 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2375
2376 PERL_ARGS_ASSERT_GV_FULLNAME4;
2377
666ea192 2378 sv_setpv(sv, prefix ? prefix : "");
a0288114 2379
52a6327b 2380 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2381 const STRLEN len = HvNAMELEN(hv);
2382 if (keepmain || strnNE(name, "main", len)) {
2383 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2384 sv_catpvs(sv,"::");
ed60a868 2385 }
43693395 2386 }
ed60a868 2387 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2388 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2389}
2390
2391void
35a4481c 2392Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2393{
099be4f1 2394 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2395
2396 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2397
46c461b5 2398 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2399}
2400
39a65960
DM		 2401
2402/* recursively scan a stash and any nested stashes looking for entries
2403 * that need the "only used once" warning raised
2404 */
2405
79072805 2406void
51da40ed 2407Perl_gv_check(pTHX_ HV *stash)
79072805 2408{
eb578fdb 2409 I32 i;
463ee0b2 2410
7918f24d
NC		 2411 PERL_ARGS_ASSERT_GV_CHECK;
2412
8990e307
LW		 2413 if (!HvARRAY(stash))
2414 return;
90754377
DM		 2415
2416 assert(SvOOK(stash));
90754377 2417
a0d0e21e 2418 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2419 const HE *entry;
90754377 2420 /* mark stash is being scanned, to avoid recursing */
339441ef 2421 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2422 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2423 GV *gv;
b7787f18 2424 HV *hv;
dc437b57 2425 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2426 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2427 {
90754377
DM		 2428 if (hv != PL_defstash && hv != stash
2429 && !(SvOOK(hv)
2430 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2431 )
a0d0e21e
LW		 2432 gv_check(hv); /* nested package */
2433 }
ecad31f0
BF		 2434 else if ( *HeKEY(entry) != '_'
2435 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2436 const char *file;
159b6efe 2437 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2438 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2439 continue;
1d7c1841 2440 file = GvFILE(gv);
1d7c1841 2441 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2442#ifdef USE_ITHREADS
2443 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2444#else
2445 CopFILEGV(PL_curcop)
2446 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2447#endif
9014280d 2448 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2449 "Name \"%"HEKf"::%"HEKf
2450 "\" used only once: possible typo",
2451 HEKfARG(HvNAME_HEK(stash)),
2452 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2453 }
79072805 2454 }
339441ef 2455 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2456 }
2457}
2458
2459GV *
9cc50d5b 2460Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2461{
9cc50d5b 2462 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2463 assert(!(flags & ~SVf_UTF8));
7918f24d 2464
b17a0679
FC		 2465 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2466 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2467 (long)PL_gensym++),
2468 GV_ADD, SVt_PVGV);
79072805
LW		 2469}
2470
2471/* hopefully this is only called on local symbol table entries */
2472
2473GP*
864dbfa3 2474Perl_gp_ref(pTHX_ GP *gp)
79072805 2475{
1d7c1841 2476 if (!gp)
d4c19fe8 2477 return NULL;
79072805 2478 gp->gp_refcnt++;
44a8e56a 2479 if (gp->gp_cv) {
2480 if (gp->gp_cvgen) {
e1a479c5
BB		 2481 /* If the GP they asked for a reference to contains
2482 a method cache entry, clear it first, so that we
2483 don't infect them with our cached entry */
e7881358 2484 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2485 gp->gp_cv = NULL;
44a8e56a 2486 gp->gp_cvgen = 0;
2487 }
44a8e56a 2488 }
79072805 2489 return gp;
79072805
LW		 2490}
2491
2492void
864dbfa3 2493Perl_gp_free(pTHX_ GV *gv)
79072805 2494{
79072805 2495 GP* gp;
b0d55c99 2496 int attempts = 100;
79072805 2497
f7877b28 2498 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2499 return;
f248d071 2500 if (gp->gp_refcnt == 0) {
9b387841
NC		 2501 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2502 "Attempt to free unreferenced glob pointers"
2503 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2504 return;
2505 }
4571f4a7 2506 if (gp->gp_refcnt > 1) {
bc81b34d 2507 borrowed:
748a9306
LW		 2508 if (gp->gp_egv == gv)
2509 gp->gp_egv = 0;
4571f4a7 2510 gp->gp_refcnt--;
c43ae56f 2511 GvGP_set(gv, NULL);
79072805 2512 return;
748a9306 2513 }
79072805 2514
b0d55c99
FC		 2515 while (1) {
2516 /* Copy and null out all the glob slots, so destructors do not see
2517 freed SVs. */
2518 HEK * const file_hek = gp->gp_file_hek;
2519 SV * const sv = gp->gp_sv;
2520 AV * const av = gp->gp_av;
2521 HV * const hv = gp->gp_hv;
2522 IO * const io = gp->gp_io;
2523 CV * const cv = gp->gp_cv;
2524 CV * const form = gp->gp_form;
2525
2526 gp->gp_file_hek = NULL;
2527 gp->gp_sv = NULL;
2528 gp->gp_av = NULL;
2529 gp->gp_hv = NULL;
2530 gp->gp_io = NULL;
2531 gp->gp_cv = NULL;
2532 gp->gp_form = NULL;
2533
2534 if (file_hek)
2535 unshare_hek(file_hek);
2536
2537 SvREFCNT_dec(sv);
2538 SvREFCNT_dec(av);
2539 /* FIXME - another reference loop GV -> symtab -> GV ?
2540 Somehow gp->gp_hv can end up pointing at freed garbage. */
2541 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2542 const HEK *hvname_hek = HvNAME_HEK(hv);
10bafe90 2543 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", HEKfARG(hvname_hek)));
c2242065 2544 if (PL_stashcache && hvname_hek)
0ca9877d 2545 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
b0d55c99
FC		 2546 SvREFCNT_dec(hv);
2547 }
96d7c888
FC		 2548 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2549 && (IoTYPE(io) == IoTYPE_WRONLY ||
2550 IoTYPE(io) == IoTYPE_RDWR ||
2551 IoTYPE(io) == IoTYPE_APPEND)
2552 && ckWARN_d(WARN_IO)
2553 && IoIFP(io) != PerlIO_stdin()
2554 && IoIFP(io) != PerlIO_stdout()
2555 && IoIFP(io) != PerlIO_stderr()
2556 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2557 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC		 2558 SvREFCNT_dec(io);
2559 SvREFCNT_dec(cv);
2560 SvREFCNT_dec(form);
2561
bc81b34d
FC		 2562 /* Possibly reallocated by a destructor */
2563 gp = GvGP(gv);
2564
b0d55c99
FC		 2565 if (!gp->gp_file_hek
2566 && !gp->gp_sv
2567 && !gp->gp_av
2568 && !gp->gp_hv
2569 && !gp->gp_io
2570 && !gp->gp_cv
2571 && !gp->gp_form) break;
2572
2573 if (--attempts == 0) {
2574 Perl_die(aTHX_
2575 "panic: gp_free failed to free glob pointer - "
2576 "something is repeatedly re-creating entries"
2577 );
2578 }
13207a71 2579 }
748a9306 2580
bc81b34d
FC		 2581 /* Possibly incremented by a destructor doing glob assignment */
2582 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2583 Safefree(gp);
c43ae56f 2584 GvGP_set(gv, NULL);
79072805
LW		 2585}
2586
d460ef45
NIS		 2587int
2588Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2589{
53c1dcc0
AL		 2590 AMT * const amtp = (AMT*)mg->mg_ptr;
2591 PERL_UNUSED_ARG(sv);
dd374669 2592
7918f24d
NC		 2593 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2594
d460ef45
NIS		 2595 if (amtp && AMT_AMAGIC(amtp)) {
2596 int i;
2597 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2598 CV * const cv = amtp->table[i];
b37c2d43 2599 if (cv) {
e7881358 2600 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2601 amtp->table[i] = NULL;
d460ef45
NIS		 2602 }
2603 }
2604 }
2605 return 0;
2606}
2607
a0d0e21e 2608/* Updates and caches the CV's */
c3a9a790
RGS		 2609/* Returns:
2610 * 1 on success and there is some overload
2611 * 0 if there is no overload
2612 * -1 if some error occurred and it couldn't croak
2613 */
a0d0e21e 2614
c3a9a790 2615int
242f8760 2616Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2617{
ad64d0ec 2618 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2619 AMT amt;
9b439311 2620 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2621 U32 newgen;
a0d0e21e 2622
7918f24d
NC		 2623 PERL_ARGS_ASSERT_GV_AMUPDATE;
2624
9b439311 2625 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2626 if (mg) {
2627 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2628 if (amtp->was_ok_sub == newgen) {
8c34e50d 2629 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2630 }
ad64d0ec 2631 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2632 }
a0d0e21e 2633
bfcb3514 2634 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2635
d460ef45 2636 Zero(&amt,1,AMT);
e1a479c5 2637 amt.was_ok_sub = newgen;
a6006777 2638 amt.fallback = AMGfallNO;
2639 amt.flags = 0;
2640
a6006777 2641 {
8c34e50d
FC		 2642 int filled = 0;
2643 int i;
3d147ac2
DM		 2644 bool deref_seen = 0;
2645
a6006777 2646
3866ea3b 2647 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2648
89ffc314 2649 /* Try to find via inheritance. */
e6919483 2650 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2651 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2652 CV* cv;
89ffc314
IZ		 2653
2654 if (!gv)
3866ea3b
FC		 2655 {
2656 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2657 goto no_table;
3866ea3b
FC		 2658 }
2659#ifdef PERL_DONT_CREATE_GVSV
2660 else if (!sv) {
6f207bd3 2661 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2662 }
2663#endif
79c9643d
JL		 2664 else if (SvTRUE(sv))
2665 /* don't need to set overloading here because fallback => 1
2666 * is the default setting for classes without overloading */
89ffc314 2667 amt.fallback=AMGfallYES;
79c9643d
JL		 2668 else if (SvOK(sv)) {
2669 amt.fallback=AMGfallNEVER;
386a5489 2670 filled = 1;
386a5489 2671 }
79c9643d 2672 else {
386a5489 2673 filled = 1;
386a5489 2674 }
a6006777 2675
3d147ac2 2676 assert(SvOOK(stash));
3d147ac2 2677 /* initially assume the worst */
339441ef 2678 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2679
8c34e50d 2680 for (i = 1; i < NofAMmeth; i++) {
6136c704 2681 const char * const cooky = PL_AMG_names[i];
32251b26 2682 /* Human-readable form, for debugging: */
8c34e50d 2683 const char * const cp = AMG_id2name(i);
d279ab82 2684 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2685
a0288114 2686 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2687 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2688 /* don't fill the cache while looking up!
2689 Creation of inheritance stubs in intermediate packages may
2690 conflict with the logic of runtime method substitution.
2691 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2692 then we could have created stubs for "(+0" in A and C too.
2693 But if B overloads "bool", we may want to use it for
2694 numifying instead of C's "+0". */
8c34e50d 2695 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2696 cv = 0;
c3ad4e54
FC		 2697 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2698 const HEK * const gvhek =
2699 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2700 const HEK * const stashek =
2701 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2702 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2703 && stashek && HEK_LEN(stashek) == 8
2704 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ		 2705 /* This is a hack to support autoloading..., while
2706 knowing *which* methods were declared as overloaded. */
44a8e56a 2707 /* GvSV contains the name of the method. */
6136c704 2708 GV *ngv = NULL;
c69033f2 2709 SV *gvsv = GvSV(gv);
a0288114
AL		 2710
2711 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2712 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2713 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2714 if (!gvsv || !SvPOK(gvsv)
7f415459 2715 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2716 {
a0288114 2717 /* Can be an import stub (created by "can"). */
242f8760 2718 if (destructing) {
c3a9a790 2719 return -1;
242f8760
RGS		 2720 }
2721 else {
d66cca07
BF		 2722 const SV * const name = (gvsv && SvPOK(gvsv))
2723 ? gvsv
2724 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2725 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2726 Perl_croak(aTHX_ "%s method \"%"SVf256
2727 "\" overloading \"%s\" "\
d0c0e7dd 2728 "in package \"%"HEKf256"\"",
242f8760
RGS		 2729 (GvCVGEN(gv) ? "Stub found while resolving"
2730 : "Can't resolve"),
d66cca07 2731 SVfARG(name), cp,
d0c0e7dd 2732 HEKfARG(
d66cca07 2733 HvNAME_HEK(stash)
d0c0e7dd 2734 ));
242f8760 2735 }
44a8e56a 2736 }
dc848c6f 2737 cv = GvCV(gv = ngv);
44a8e56a 2738 }
b464bac0 2739 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2740 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2741 GvNAME(CvGV(cv))) );
2742 filled = 1;
611c1e95 2743 } else if (gv) { /* Autoloaded... */
ea726b52 2744 cv = MUTABLE_CV(gv);
611c1e95 2745 filled = 1;
44a8e56a 2746 }
ea726b52 2747 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2748
2749 if (gv) {
2750 switch (i) {
2751 case to_sv_amg:
2752 case to_av_amg:
2753 case to_hv_amg:
2754 case to_gv_amg:
2755 case to_cv_amg:
2756 case nomethod_amg:
2757 deref_seen = 1;
2758 break;
2759 }
2760 }
a0d0e21e 2761 }
3d147ac2 2762 if (!deref_seen)
45479970
DM		 2763 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2764 * NB - aux var invalid here, HvARRAY() could have been
2765 * reallocated since it was assigned to */
2766 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2767
a0d0e21e 2768 if (filled) {
a6006777 2769 AMT_AMAGIC_on(&amt);
ad64d0ec 2770 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2771 (char*)&amt, sizeof(AMT));
8c34e50d 2772 return TRUE;
a0d0e21e
LW		 2773 }
2774 }
a6006777 2775 /* Here we have no table: */
8c34e50d 2776 no_table:
a6006777 2777 AMT_AMAGIC_off(&amt);
ad64d0ec 2778 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2779 (char*)&amt, sizeof(AMTS));
c3a9a790 2780 return 0;
a0d0e21e
LW		 2781}
2782
32251b26
IZ		 2783
2784CV*
2785Perl_gv_handler(pTHX_ HV *stash, I32 id)
2786{
3f8f4626 2787 MAGIC *mg;
32251b26 2788 AMT *amtp;
e1a479c5 2789 U32 newgen;
9b439311 2790 struct mro_meta* stash_meta;
32251b26 2791
bfcb3514 2792 if (!stash || !HvNAME_get(stash))
601f1833 2793 return NULL;
e1a479c5 2794
9b439311
BB		 2795 stash_meta = HvMROMETA(stash);
2796 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2797
ad64d0ec 2798 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2799 if (!mg) {
2800 do_update:
8c34e50d 2801 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2802 return NULL;
ad64d0ec 2803 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2804 }
a9fd4e40 2805 assert(mg);
32251b26 2806 amtp = (AMT*)mg->mg_ptr;
66978156 2807 if ( amtp->was_ok_sub != newgen )
32251b26 2808 goto do_update;
3ad83ce7 2809 if (AMT_AMAGIC(amtp)) {
b7787f18 2810 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2811 if (ret && isGV(ret)) { /* Autoloading stab */
2812 /* Passing it through may have resulted in a warning
2813 "Inherited AUTOLOAD for a non-method deprecated", since
2814 our caller is going through a function call, not a method call.
2815 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2816 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2817
2818 if (gv && GvCV(gv))
2819 return GvCV(gv);
2820 }
2821 return ret;
2822 }
a0288114 2823
601f1833 2824 return NULL;
32251b26
IZ		 2825}
2826
2827
6f1401dc
DM		 2828/* Implement tryAMAGICun_MG macro.
2829 Do get magic, then see if the stack arg is overloaded and if so call it.
2830 Flags:
2831 AMGf_set return the arg using SETs rather than assigning to
2832 the targ
2833 AMGf_numeric apply sv_2num to the stack arg.
2834*/
2835
2836bool
2837Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2838 dSP;
2839 SV* tmpsv;
2840 SV* const arg = TOPs;
2841
2842 SvGETMAGIC(arg);
2843
9f8bf298
NC		 2844 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2845 AMGf_noright | AMGf_unary))) {
6f1401dc
DM		 2846 if (flags & AMGf_set) {
2847 SETs(tmpsv);
2848 }
2849 else {
2850 dTARGET;
2851 if (SvPADMY(TARG)) {
2852 sv_setsv(TARG, tmpsv);
2853 SETTARG;
2854 }
2855 else
2856 SETs(tmpsv);
2857 }
2858 PUTBACK;
2859 return TRUE;
2860 }
2861
2862 if ((flags & AMGf_numeric) && SvROK(arg))
2863 *sp = sv_2num(arg);
2864 return FALSE;
2865}
2866
2867
2868/* Implement tryAMAGICbin_MG macro.
2869 Do get magic, then see if the two stack args are overloaded and if so
2870 call it.
2871 Flags:
2872 AMGf_set return the arg using SETs rather than assigning to
2873 the targ
2874 AMGf_assign op may be called as mutator (eg +=)
2875 AMGf_numeric apply sv_2num to the stack arg.
2876*/
2877
2878bool
2879Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 2880 dSP;
2881 SV* const left = TOPm1s;
2882 SV* const right = TOPs;
2883
2884 SvGETMAGIC(left);
2885 if (left != right)
2886 SvGETMAGIC(right);
2887
2888 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2889 SV * const tmpsv = amagic_call(left, right, method,
2890 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2891 if (tmpsv) {
2892 if (flags & AMGf_set) {
2893 (void)POPs;
2894 SETs(tmpsv);
2895 }
2896 else {
2897 dATARGET;
2898 (void)POPs;
2899 if (opASSIGN || SvPADMY(TARG)) {
2900 sv_setsv(TARG, tmpsv);
2901 SETTARG;
2902 }
2903 else
2904 SETs(tmpsv);
2905 }
2906 PUTBACK;
2907 return TRUE;
2908 }
2909 }
75ea7a12
FC		 2910 if(left==right && SvGMAGICAL(left)) {
2911 SV * const left = sv_newmortal();
2912 *(sp-1) = left;
2913 /* Print the uninitialized warning now, so it includes the vari-
2914 able name. */
2915 if (!SvOK(right)) {
2916 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2917 sv_setsv_flags(left, &PL_sv_no, 0);
2918 }
2919 else sv_setsv_flags(left, right, 0);
2920 SvGETMAGIC(right);
2921 }
6f1401dc 2922 if (flags & AMGf_numeric) {
75ea7a12
FC		 2923 if (SvROK(TOPm1s))
2924 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2925 if (SvROK(right))
2926 *sp = sv_2num(right);
2927 }
2928 return FALSE;
2929}
2930
25a9ffce
NC		 2931SV *
2932Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2933 SV *tmpsv = NULL;
3d147ac2 2934 HV *stash;
25a9ffce
NC		 2935
2936 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2937
3d147ac2
DM		 2938 if (!SvAMAGIC(ref))
2939 return ref;
2940 /* return quickly if none of the deref ops are overloaded */
2941 stash = SvSTASH(SvRV(ref));
2942 assert(SvOOK(stash));
2943 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2944 return ref;
2945
2946 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 2947 AMGf_noright | AMGf_unary))) {
2948 if (!SvROK(tmpsv))
2949 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2950 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2951 /* Bail out if it returns us the same reference. */
2952 return tmpsv;
2953 }
2954 ref = tmpsv;
3d147ac2
DM		 2955 if (!SvAMAGIC(ref))
2956 break;
25a9ffce
NC		 2957 }
2958 return tmpsv ? tmpsv : ref;
2959}
6f1401dc 2960
8d569291
FC		 2961bool
2962Perl_amagic_is_enabled(pTHX_ int method)
2963{
2964 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2965
2966 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2967
2968 if ( !lex_mask || !SvOK(lex_mask) )
2969 /* overloading lexically disabled */
2970 return FALSE;
2971 else if ( lex_mask && SvPOK(lex_mask) ) {
2972 /* we have an entry in the hints hash, check if method has been
2973 * masked by overloading.pm */
2974 STRLEN len;
2975 const int offset = method / 8;
2976 const int bit = method % 8;
2977 char *pv = SvPV(lex_mask, len);
2978
2979 /* Bit set, so this overloading operator is disabled */
2980 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2981 return FALSE;
2982 }
2983 return TRUE;
2984}
2985
a0d0e21e 2986SV*
864dbfa3 2987Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2988{
27da23d5 2989 dVAR;
b267980d 2990 MAGIC *mg;
9c5ffd7c 2991 CV *cv=NULL;
a0d0e21e 2992 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2993 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 2994 int off = 0, off1, lr = 0, notfound = 0;
2995 int postpr = 0, force_cpy = 0;
2996 int assign = AMGf_assign & flags;
2997 const int assignshift = assign ? 1 : 0;
bf5522a1 2998 int use_default_op = 0;
67288365 2999 int force_scalar = 0;
497b47a8
JH		 3000#ifdef DEBUGGING
3001 int fl=0;
497b47a8 3002#endif
25716404 3003 HV* stash=NULL;
7918f24d
NC		 3004
3005 PERL_ARGS_ASSERT_AMAGIC_CALL;
3006
e46c382e 3007 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3008 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 3009 }
3010
a0d0e21e 3011 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3012 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3013 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3014 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3015 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3016 : NULL))
b267980d 3017 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 3018 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3019 * usual method */
497b47a8
JH		 3020 (
3021#ifdef DEBUGGING
3022 fl = 1,
a0288114 3023#endif
497b47a8 3024 cv = cvp[off=method])))) {
a0d0e21e
LW		 3025 lr = -1; /* Call method for left argument */
3026 } else {
3027 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3028 int logic;
3029
3030 /* look for substituted methods */
ee239bfe 3031 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 3032 switch (method) {
3033 case inc_amg:
ee239bfe
IZ		 3034 force_cpy = 1;
3035 if ((cv = cvp[off=add_ass_amg])
3036 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3037 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3038 }
3039 break;
3040 case dec_amg:
ee239bfe
IZ		 3041 force_cpy = 1;
3042 if ((cv = cvp[off = subtr_ass_amg])
3043 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3044 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3045 }
3046 break;
3047 case bool__amg:
3048 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3049 break;
3050 case numer_amg:
3051 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3052 break;
3053 case string_amg:
3054 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3055 break;
b7787f18
AL		 3056 case not_amg:
3057 (void)((cv = cvp[off=bool__amg])
3058 || (cv = cvp[off=numer_amg])
3059 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 3060 if (cv)
3061 postpr = 1;
b7787f18 3062 break;
748a9306
LW		 3063 case copy_amg:
3064 {
76e3520e
GS		 3065 /*
3066 * SV* ref causes confusion with the interpreter variable of
3067 * the same name
3068 */
890ce7af 3069 SV* const tmpRef=SvRV(left);
76e3520e 3070 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 3071 /*
3072 * Just to be extra cautious. Maybe in some
3073 * additional cases sv_setsv is safe, too.
3074 */
890ce7af 3075 SV* const newref = newSVsv(tmpRef);
748a9306 3076 SvOBJECT_on(newref);
a1cd65be
FC		 3077 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3078 delegate to the stash. */
85fbaab2 3079 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 3080 return newref;
3081 }
3082 }
3083 break;
a0d0e21e 3084 case abs_amg:
b267980d 3085 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3086 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3087 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3088 if (off1==lt_amg) {
890ce7af 3089 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3090 lt_amg,AMGf_noright);
3091 logic = SvTRUE(lessp);
3092 } else {
890ce7af 3093 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3094 ncmp_amg,AMGf_noright);
3095 logic = (SvNV(lessp) < 0);
3096 }
3097 if (logic) {
3098 if (off==subtr_amg) {
3099 right = left;
748a9306 3100 left = nullsv;
a0d0e21e
LW		 3101 lr = 1;
3102 }
3103 } else {
3104 return left;
3105 }
3106 }
3107 break;
3108 case neg_amg:
155aba94 3109 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 3110 right = left;
3111 left = sv_2mortal(newSViv(0));
3112 lr = 1;
3113 }
3114 break;
f216259d 3115 case int_amg:
f5284f61 3116 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3117 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3118 case regexp_amg:
b267980d
NIS		 3119 /* FAIL safe */
3120 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3121
f5284f61
IZ		 3122 case to_sv_amg:
3123 case to_av_amg:
3124 case to_hv_amg:
3125 case to_gv_amg:
3126 case to_cv_amg:
3127 /* FAIL safe */
b267980d 3128 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3129
a0d0e21e
LW		 3130 default:
3131 goto not_found;
3132 }
3133 if (!cv) goto not_found;
3134 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3135 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3136 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3137 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3138 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3139 : NULL))
69815d08
RS		 3140 && (cv = cvp[off=method])) { /* Method for right
3141 * argument found */
3142 lr=1;
bf5522a1
MB		 3143 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3144 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 3145 && !(flags & AMGf_unary)) {
3146 /* We look for substitution for
3147 * comparison operations and
fc36a67e 3148 * concatenation */
a0d0e21e
LW		 3149 if (method==concat_amg || method==concat_ass_amg
3150 || method==repeat_amg || method==repeat_ass_amg) {
3151 return NULL; /* Delegate operation to string conversion */
3152 }
3153 off = -1;
3154 switch (method) {
3155 case lt_amg:
3156 case le_amg:
3157 case gt_amg:
3158 case ge_amg:
3159 case eq_amg:
3160 case ne_amg:
2ab54efd
MB		 3161 off = ncmp_amg;
3162 break;
a0d0e21e
LW		 3163 case slt_amg:
3164 case sle_amg:
3165 case sgt_amg:
3166 case sge_amg:
3167 case seq_amg:
3168 case sne_amg:
2ab54efd
MB		 3169 off = scmp_amg;
3170 break;
a0d0e21e 3171 }
bf5522a1
MB		 3172 if (off != -1) {
3173 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3174 cv = ocvp[off];
3175 lr = -1;
3176 }
3177 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3178 cv = cvp[off];
3179 lr = 1;
3180 }
3181 }
3182 if (cv)
2ab54efd
MB		 3183 postpr = 1;
3184 else
3185 goto not_found;
a0d0e21e 3186 } else {
a6006777 3187 not_found: /* No method found, either report or croak */
b267980d
NIS		 3188 switch (method) {
3189 case to_sv_amg:
3190 case to_av_amg:
3191 case to_hv_amg:
3192 case to_gv_amg:
3193 case to_cv_amg:
3194 /* FAIL safe */
3195 return left; /* Delegate operation to standard mechanisms. */
b267980d 3196 }
a0d0e21e
LW		 3197 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3198 notfound = 1; lr = -1;
3199 } else if (cvp && (cv=cvp[nomethod_amg])) {
3200 notfound = 1; lr = 1;
bf5522a1
MB		 3201 } else if ((use_default_op =
3202 (!ocvp || oamtp->fallback >= AMGfallYES)
3203 && (!cvp || amtp->fallback >= AMGfallYES))
3204 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3205 /* Skip generating the "no method found" message. */
3206 return NULL;
a0d0e21e 3207 } else {
46fc3d4c 3208 SV *msg;
774d564b 3209 if (off==-1) off=method;
b267980d 3210 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3211 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3212 AMG_id2name(method + assignshift),
3213 (flags & AMGf_unary ? " " : "\n\tleft "),
3214 SvAMAGIC(left)?
3215 "in overloaded package ":
3216 "has no overloaded magic",
3217 SvAMAGIC(left)?
3218 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3219 SVfARG(&PL_sv_no),
3220 SvAMAGIC(right)?
3221 ",\n\tright argument in overloaded package ":
3222 (flags & AMGf_unary
3223 ? ""
3224 : ",\n\tright argument has no overloaded magic"),
3225 SvAMAGIC(right)?
3226 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3227 SVfARG(&PL_sv_no)));
bf5522a1 3228 if (use_default_op) {
d66cca07 3229 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3230 } else {
be2597df 3231 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3232 }
3233 return NULL;
3234 }
ee239bfe 3235 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3236 }
3237 }
67288365
JL		 3238
3239 switch (method) {
3240 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3241 * operation. we need this to return a value, so that it can be assigned
3242 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3243 * increment or decrement was itself called in void context */
3244 case inc_amg:
3245 if (off == add_amg)
3246 force_scalar = 1;
3247 break;
3248 case dec_amg:
3249 if (off == subtr_amg)
3250 force_scalar = 1;
3251 break;
3252 /* in these cases, we're calling an assignment variant of an operator
3253 * (+= rather than +, for instance). regardless of whether it's a
3254 * fallback or not, it always has to return a value, which will be
3255 * assigned to the proper variable later */
3256 case add_amg:
3257 case subtr_amg:
3258 case mult_amg:
3259 case div_amg:
3260 case modulo_amg:
3261 case pow_amg:
3262 case lshift_amg:
3263 case rshift_amg:
3264 case repeat_amg:
3265 case concat_amg:
3266 case band_amg:
3267 case bor_amg:
3268 case bxor_amg:
3269 if (assign)
3270 force_scalar = 1;
3271 break;
3272 /* the copy constructor always needs to return a value */
3273 case copy_amg:
3274 force_scalar = 1;
3275 break;
3276 /* because of the way these are implemented (they don't perform the
3277 * dereferencing themselves, they return a reference that perl then
3278 * dereferences later), they always have to be in scalar context */
3279 case to_sv_amg:
3280 case to_av_amg:
3281 case to_hv_amg:
3282 case to_gv_amg:
3283 case to_cv_amg:
3284 force_scalar = 1;
3285 break;
3286 /* these don't have an op of their own; they're triggered by their parent
3287 * op, so the context there isn't meaningful ('$a and foo()' in void
3288 * context still needs to pass scalar context on to $a's bool overload) */
3289 case bool__amg:
3290 case numer_amg:
3291 case string_amg:
3292 force_scalar = 1;
3293 break;
3294 }
3295
497b47a8 3296#ifdef DEBUGGING
a0d0e21e 3297 if (!notfound) {
497b47a8 3298 DEBUG_o(Perl_deb(aTHX_
d66cca07 3299 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3300 AMG_id2name(off),
3301 method+assignshift==off? "" :
a0288114 3302 " (initially \"",
497b47a8
JH		 3303 method+assignshift==off? "" :
3304 AMG_id2name(method+assignshift),
a0288114 3305 method+assignshift==off? "" : "\")",
497b47a8
JH		 3306 flags & AMGf_unary? "" :
3307 lr==1 ? " for right argument": " for left argument",
3308 flags & AMGf_unary? " for argument" : "",
d66cca07 3309 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3310 fl? ",\n\tassignment variant used": "") );
ee239bfe 3311 }
497b47a8 3312#endif
748a9306
LW		 3313 /* Since we use shallow copy during assignment, we need
3314 * to dublicate the contents, probably calling user-supplied
3315 * version of copy operator
3316 */
ee239bfe
IZ		 3317 /* We need to copy in following cases:
3318 * a) Assignment form was called.
3319 * assignshift==1, assign==T, method + 1 == off
3320 * b) Increment or decrement, called directly.
3321 * assignshift==0, assign==0, method + 0 == off
3322 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3323 * assignshift==0, assign==T,
ee239bfe
IZ		 3324 * force_cpy == T
3325 * d) Increment or decrement, translated to nomethod.
b267980d 3326 * assignshift==0, assign==0,
ee239bfe
IZ		 3327 * force_cpy == T
3328 * e) Assignment form translated to nomethod.
3329 * assignshift==1, assign==T, method + 1 != off
3330 * force_cpy == T
3331 */
3332 /* off is method, method+assignshift, or a result of opcode substitution.
3333 * In the latter case assignshift==0, so only notfound case is important.
3334 */
73512201 3335 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3336 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3337 || force_cpy) )
6f1401dc 3338 {
1b38c28e
NC		 3339 /* newSVsv does not behave as advertised, so we copy missing
3340 * information by hand */
3341 SV *tmpRef = SvRV(left);
3342 SV *rv_copy;
31d632c3 3343 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3344 SvRV_set(left, rv_copy);
3345 SvSETMAGIC(left);
e7881358 3346 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3347 }
6f1401dc
DM		 3348 }
3349
a0d0e21e
LW		 3350 {
3351 dSP;
3352 BINOP myop;
3353 SV* res;
b7787f18 3354 const bool oldcatch = CATCH_GET;
67288365
JL		 3355 I32 oldmark, nret;
3356 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3357
54310121 3358 CATCH_SET(TRUE);
a0d0e21e
LW		 3359 Zero(&myop, 1, BINOP);
3360 myop.op_last = (OP *) &myop;
b37c2d43 3361 myop.op_next = NULL;
67288365
JL		 3362 myop.op_flags = OPf_STACKED;
3363
3364 switch (gimme) {
3365 case G_VOID:
3366 myop.op_flags |= OPf_WANT_VOID;
3367 break;
3368 case G_ARRAY:
3369 if (flags & AMGf_want_list) {
3370 myop.op_flags |= OPf_WANT_LIST;
3371 break;
3372 }
3373 /* FALLTHROUGH */
3374 default:
3375 myop.op_flags |= OPf_WANT_SCALAR;
3376 break;
3377 }
a0d0e21e 3378
e788e7d3 3379 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3380 ENTER;
462e5cf6 3381 SAVEOP();
533c011a 3382 PL_op = (OP *) &myop;
3280af22 3383 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3384 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3385 Perl_pp_pushmark(aTHX);
a0d0e21e 3386
924508f0 3387 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3388 PUSHs(lr>0? right: left);
3389 PUSHs(lr>0? left: right);
3280af22 3390 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3391 if (notfound) {
59cd0e26
NC		 3392 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3393 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3394 }
ad64d0ec 3395 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3396 PUTBACK;
67288365 3397 oldmark = TOPMARK;
a0d0e21e 3398
139d0ce6 3399 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3400 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3401 LEAVE;
3402 SPAGAIN;
67288365
JL		 3403 nret = SP - (PL_stack_base + oldmark);
3404
3405 switch (gimme) {
3406 case G_VOID:
3407 /* returning NULL has another meaning, and we check the context
3408 * at the call site too, so this can be differentiated from the
3409 * scalar case */
3410 res = &PL_sv_undef;
3411 SP = PL_stack_base + oldmark;
3412 break;
3413 case G_ARRAY: {
3414 if (flags & AMGf_want_list) {
3415 res = sv_2mortal((SV *)newAV());
3416 av_extend((AV *)res, nret);
3417 while (nret--)
3418 av_store((AV *)res, nret, POPs);
3419 break;
3420 }
3421 /* FALLTHROUGH */
3422 }
3423 default:
3424 res = POPs;
3425 break;
3426 }
a0d0e21e 3427
ebafeae7 3428 PUTBACK;
d3acc0f7 3429 POPSTACK;
54310121 3430 CATCH_SET(oldcatch);
a0d0e21e 3431
a0d0e21e 3432 if (postpr) {
b7787f18 3433 int ans;
a0d0e21e
LW		 3434 switch (method) {
3435 case le_amg:
3436 case sle_amg:
3437 ans=SvIV(res)<=0; break;
3438 case lt_amg:
3439 case slt_amg:
3440 ans=SvIV(res)<0; break;
3441 case ge_amg:
3442 case sge_amg:
3443 ans=SvIV(res)>=0; break;
3444 case gt_amg:
3445 case sgt_amg:
3446 ans=SvIV(res)>0; break;
3447 case eq_amg:
3448 case seq_amg:
3449 ans=SvIV(res)==0; break;
3450 case ne_amg:
3451 case sne_amg:
3452 ans=SvIV(res)!=0; break;
3453 case inc_amg:
3454 case dec_amg:
bbce6d69 3455 SvSetSV(left,res); return left;
dc437b57 3456 case not_amg:
fe7ac86a 3457 ans=!SvTRUE(res); break;
b7787f18
AL		 3458 default:
3459 ans=0; break;
a0d0e21e 3460 }
54310121 3461 return boolSV(ans);
748a9306
LW		 3462 } else if (method==copy_amg) {
3463 if (!SvROK(res)) {
cea2e8a9 3464 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3465 }
3466 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3467 } else {
3468 return res;
3469 }
3470 }
3471}
c9d5ac95 3472
f5c1e807
NC		 3473void
3474Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3475{
3476 dVAR;
acda4c6a 3477 U32 hash;
f5c1e807 3478
7918f24d 3479 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3480
acda4c6a
NC		 3481 if (len > I32_MAX)
3482 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3483
ae8cc45f
NC		 3484 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3485 unshare_hek(GvNAME_HEK(gv));
3486 }
3487
acda4c6a 3488 PERL_HASH(hash, name, len);
c60dbbc3 3489 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3490}
3491
66610fdd 3492/*
f7461760
Z		 3493=for apidoc gv_try_downgrade
3494
2867cdbc
Z		 3495If the typeglob C<gv> can be expressed more succinctly, by having
3496something other than a real GV in its place in the stash, replace it
3497with the optimised form. Basic requirements for this are that C<gv>
3498is a real typeglob, is sufficiently ordinary, and is only referenced
3499from its package. This function is meant to be used when a GV has been
3500looked up in part to see what was there, causing upgrading, but based
3501on what was found it turns out that the real GV isn't required after all.
3502
3503If C<gv> is a completely empty typeglob, it is deleted from the stash.
3504
3505If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3506sub, the typeglob is replaced with a scalar-reference placeholder that
3507more compactly represents the same thing.
f7461760
Z		 3508
3509=cut
3510*/
3511
3512void
3513Perl_gv_try_downgrade(pTHX_ GV *gv)
3514{
3515 HV *stash;
3516 CV *cv;
3517 HEK *namehek;
3518 SV **gvp;
3519 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3520
3521 /* XXX Why and where does this leave dangling pointers during global
3522 destruction? */
627364f1 3523 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3524
2867cdbc 3525 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3526 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3527 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3528 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3529 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3530 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3531 return;
2be08ad1
FC		 3532 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3533 return;
803f2748
DM		 3534 if (SvMAGICAL(gv)) {
3535 MAGIC *mg;
3536 /* only backref magic is allowed */
3537 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3538 return;
3539 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3540 if (mg->mg_type != PERL_MAGIC_backref)
3541 return;
3542 }
3543 }
2867cdbc
Z		 3544 cv = GvCV(gv);
3545 if (!cv) {
3546 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3547 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3548 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3549 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3550 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z		 3551 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3552 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3553 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3554 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3555 *gvp == (SV*)gv) {
3556 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3557 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3558 SvREFCNT(gv) = 0;
3559 sv_clear((SV*)gv);
3560 SvREFCNT(gv) = 1;
70e5f2b5 3561 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH		 3562
3563 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z		 3564 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3565 STRUCT_OFFSET(XPVIV, xiv_iv));
3566 SvRV_set(gv, value);
3567 }
3568}
3569
9e3fb20c
FC		 3570GV *
3571Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3572{
3573 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3574 GV * const *gvp;
3575 PERL_ARGS_ASSERT_GV_OVERRIDE;
3576 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3577 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3578 gv = gvp ? *gvp : NULL;
3579 if (gv && !isGV(gv)) {
3580 if (!SvPCS_IMPORTED(gv)) return NULL;
3581 gv_init(gv, PL_globalstash, name, len, 0);
3582 return gv;
3583 }
3584 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3585}
3586
4aaa4757
FC		 3587#include "XSUB.h"
3588
3589static void
3590core_xsub(pTHX_ CV* cv)
3591{
3592 Perl_croak(aTHX_
3593 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3594 );
3595}
3596
f7461760 3597/*
66610fdd
RGS		 3598 * Local variables:
3599 * c-indentation-style: bsd
3600 * c-basic-offset: 4
14d04a33 3601 * indent-tabs-mode: nil
66610fdd
RGS		 3602 * End:
3603 *
14d04a33 3604 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3605 */
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