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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW		 9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW		 14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW		 20 */
21
ccfc67b7
JH		 22/*
23=head1 GV Functions
166f8a29
DM		 24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH		 32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
6ffcffbd 37#include "overload.inc"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a 41static const char S_autoload[] = "AUTOLOAD";
3c81f0b3 42#define S_autolen (sizeof("AUTOLOAD")-1)
5c7983e5 43
13c59d41
MH		 44GV *
45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13c59d41
MH		 49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
13be902c 53 && SvTYPE((const SV *)gv) != SVt_PVLV
13c59d41 54 )
13be902c 55 ) {
bb85b28a 56 const char *what;
13c59d41 57 if (type == SVt_PVIO) {
bb85b28a
NC		 58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
13c59d41 64 } else if (type == SVt_PVHV) {
bb85b28a
NC		 65 what = "hash";
66 } else {
13c59d41 67 what = type == SVt_PVAV ? "array" : "scalar";
bb85b28a 68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC		 70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896 72
13c59d41
MH		 73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
13c59d41
MH		 83 if (!*where)
84 {
85 *where = newSV_type(type);
b59bf0b2
KW		 86 if (type == SVt_PVAV
87 && memEQs(GvNAME(gv), GvNAMELEN(gv), "ISA"))
13c59d41 88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
e17aed30 89 }
13c59d41 90 return gv;
79072805
LW		 91}
92
93GV *
864dbfa3 94Perl_gv_fetchfile(pTHX_ const char *name)
79072805 95{
7918f24d 96 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC		 97 return gv_fetchfile_flags(name, strlen(name), 0);
98}
99
100GV *
101Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
102 const U32 flags)
103{
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW		 107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC		 110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS		 116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS		 120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC		 122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
c7a622b3 132 if (PERLDB_LINE_OR_SAVESRC && !GvAV(gv))
43e4250a 133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
53d95988
CS		 134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW		 136 return gv;
137}
138
62d55b22
NC		 139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
796b6530 145C<NULL>.
62d55b22
NC		 146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d 153 PERL_ARGS_ASSERT_GV_CONST_SV;
23491f1d 154 PERL_UNUSED_CONTEXT;
7918f24d 155
62d55b22
NC		 156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
16a6e5a4 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV && SvTYPE(SvRV(gv)) != SVt_PVCV ? SvRV(gv) : NULL;
62d55b22
NC		 159}
160
12816592
NC		 161GP *
162Perl_newGP(pTHX_ GV *const gv)
163{
164 GP *gp;
19bad673 165 U32 hash;
19bad673
NC		 166 const char *file;
167 STRLEN len;
2639089b 168#ifndef USE_ITHREADS
6b352265 169 GV *filegv;
2639089b 170#endif
c2587955 171 dVAR;
19bad673 172
7918f24d 173 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD		 174 Newxz(gp, 1, GP);
175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
176#ifndef PERL_DONT_CREATE_GVSV
177 gp->gp_sv = newSV(0);
178#endif
7918f24d 179
c947bc1d
FC		 180 /* PL_curcop may be null here. E.g.,
181 INIT { bless {} and exit }
182 frees INIT before looking up DESTROY (and creating *DESTROY)
183 */
2639089b
DD		 184 if (PL_curcop) {
185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 186#ifdef USE_ITHREADS
2639089b
DD		 187 if (CopFILE(PL_curcop)) {
188 file = CopFILE(PL_curcop);
189 len = strlen(file);
190 }
2639089b 191#else
cb0d3385
FC		 192 filegv = CopFILEGV(PL_curcop);
193 if (filegv) {
194 file = GvNAME(filegv)+2;
195 len = GvNAMELEN(filegv)-2;
196 }
6e314d4f 197#endif
cb0d3385
FC		 198 else goto no_file;
199 }
200 else {
201 no_file:
19bad673
NC		 202 file = "";
203 len = 0;
204 }
f4890806
NC		 205
206 PERL_HASH(hash, file, len);
f4890806 207 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC		 208 gp->gp_refcnt = 1;
209
210 return gp;
211}
212
803f2748
DM		 213/* Assign CvGV(cv) = gv, handling weak references.
214 * See also S_anonymise_cv_maybe */
215
216void
217Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
218{
ae77754a 219 GV * const oldgv = CvNAMED(cv) ? NULL : SvANY(cv)->xcv_gv_u.xcv_gv;
b290562e 220 HEK *hek;
803f2748
DM		 221 PERL_ARGS_ASSERT_CVGV_SET;
222
223 if (oldgv == gv)
224 return;
225
226 if (oldgv) {
cfc1e951 227 if (CvCVGV_RC(cv)) {
e7881358 228 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM		 229 CvCVGV_RC_off(cv);
230 }
803f2748 231 else {
803f2748
DM		 232 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
233 }
234 }
db5cc3ee
FC		 235 else if ((hek = CvNAME_HEK(cv))) {
236 unshare_hek(hek);
f3feca7a 237 CvLEXICAL_off(cv);
db5cc3ee 238 }
803f2748 239
5988f306 240 CvNAMED_off(cv);
b290562e 241 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 242 assert(!CvCVGV_RC(cv));
803f2748
DM		 243
244 if (!gv)
245 return;
246
c794ca97
DM		 247 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
248 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
249 else {
cfc1e951 250 CvCVGV_RC_on(cv);
803f2748
DM		 251 SvREFCNT_inc_simple_void_NN(gv);
252 }
803f2748
DM		 253}
254
ae77754a
FC		 255/* Convert CvSTASH + CvNAME_HEK into a GV. Conceptually, all subs have a
256 GV, but for efficiency that GV may not in fact exist. This function,
257 called by CvGV, reifies it. */
258
259GV *
260Perl_cvgv_from_hek(pTHX_ CV *cv)
261{
262 GV *gv;
2eaf799e 263 SV **svp;
ae77754a
FC		 264 PERL_ARGS_ASSERT_CVGV_FROM_HEK;
265 assert(SvTYPE(cv) == SVt_PVCV);
266 if (!CvSTASH(cv)) return NULL;
267 ASSUME(CvNAME_HEK(cv));
2eaf799e
FC		 268 svp = hv_fetchhek(CvSTASH(cv), CvNAME_HEK(cv), 0);
269 gv = MUTABLE_GV(svp && *svp ? *svp : newSV(0));
270 if (!isGV(gv))
271 gv_init_pvn(gv, CvSTASH(cv), HEK_KEY(CvNAME_HEK(cv)),
ae77754a
FC		 272 HEK_LEN(CvNAME_HEK(cv)),
273 SVf_UTF8 * !!HEK_UTF8(CvNAME_HEK(cv)));
2eaf799e
FC		 274 if (!CvNAMED(cv)) { /* gv_init took care of it */
275 assert (SvANY(cv)->xcv_gv_u.xcv_gv == gv);
276 return gv;
277 }
ae77754a
FC		 278 unshare_hek(CvNAME_HEK(cv));
279 CvNAMED_off(cv);
280 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
2eaf799e 281 if (svp && *svp) SvREFCNT_inc_simple_void_NN(gv);
ae77754a
FC		 282 CvCVGV_RC_on(cv);
283 return gv;
284}
285
c68d9564
Z		 286/* Assign CvSTASH(cv) = st, handling weak references. */
287
288void
289Perl_cvstash_set(pTHX_ CV *cv, HV *st)
290{
291 HV *oldst = CvSTASH(cv);
292 PERL_ARGS_ASSERT_CVSTASH_SET;
293 if (oldst == st)
294 return;
295 if (oldst)
296 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
297 SvANY(cv)->xcv_stash = st;
298 if (st)
299 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
300}
803f2748 301
e1104062
FC		 302/*
303=for apidoc gv_init_pvn
304
305Converts a scalar into a typeglob. This is an incoercible typeglob;
306assigning a reference to it will assign to one of its slots, instead of
796b6530
KW		 307overwriting it as happens with typeglobs created by C<SvSetSV>. Converting
308any scalar that is C<SvOK()> may produce unpredictable results and is reserved
e1104062
FC		 309for perl's internal use.
310
311C<gv> is the scalar to be converted.
312
313C<stash> is the parent stash/package, if any.
314
04ec7e59
FC		 315C<name> and C<len> give the name. The name must be unqualified;
316that is, it must not include the package name. If C<gv> is a
e1104062
FC		 317stash element, it is the caller's responsibility to ensure that the name
318passed to this function matches the name of the element. If it does not
319match, perl's internal bookkeeping will get out of sync.
320
4a4088c4 321C<flags> can be set to C<SVf_UTF8> if C<name> is a UTF-8 string, or
04ec7e59 322the return value of SvUTF8(sv). It can also take the
796b6530 323C<GV_ADDMULTI> flag, which means to pretend that the GV has been
e1104062
FC		 324seen before (i.e., suppress "Used once" warnings).
325
326=for apidoc gv_init
327
4a4088c4 328The old form of C<gv_init_pvn()>. It does not work with UTF-8 strings, as it
04ec7e59 329has no flags parameter. If the C<multi> parameter is set, the
796b6530 330C<GV_ADDMULTI> flag will be passed to C<gv_init_pvn()>.
e1104062
FC		 331
332=for apidoc gv_init_pv
333
796b6530 334Same as C<gv_init_pvn()>, but takes a nul-terminated string for the name
e1104062
FC		 335instead of separate char * and length parameters.
336
337=for apidoc gv_init_sv
338
796b6530 339Same as C<gv_init_pvn()>, but takes an SV * for the name instead of separate
e1104062
FC		 340char * and length parameters. C<flags> is currently unused.
341
342=cut
343*/
344
463ee0b2 345void
04ec7e59 346Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF		 347{
348 char *namepv;
349 STRLEN namelen;
350 PERL_ARGS_ASSERT_GV_INIT_SV;
351 namepv = SvPV(namesv, namelen);
352 if (SvUTF8(namesv))
353 flags |= SVf_UTF8;
04ec7e59 354 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF		 355}
356
357void
04ec7e59 358Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF		 359{
360 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 361 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF		 362}
363
364void
04ec7e59 365Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 366{
3b6733bf
NC		 367 const U32 old_type = SvTYPE(gv);
368 const bool doproto = old_type > SVt_NULL;
f9509170 369 char * const proto = (doproto && SvPOK(gv))
dad95a0a 370 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 371 : NULL;
49a54bbe 372 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 373 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 374 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 375 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
6881372e
FC		 376 const bool really_sub =
377 has_constant && SvTYPE(has_constant) == SVt_PVCV;
378 COP * const old = PL_curcop;
756cb477 379
e6066781 380 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC		 381 assert (!(proto && has_constant));
382
383 if (has_constant) {
2eaf799e 384 /* The constant has to be a scalar, array or subroutine. */
5c1f4d79 385 switch (SvTYPE(has_constant)) {
5c1f4d79 386 case SVt_PVHV:
5c1f4d79
NC		 387 case SVt_PVFM:
388 case SVt_PVIO:
389 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
390 sv_reftype(has_constant, 0));
c9a0dcdc 391 NOT_REACHED; /* NOTREACHED */
4bbde2f7 392 break;
81d52ecd 393
42d0e0b7 394 default: NOOP;
5c1f4d79 395 }
756cb477
NC		 396 SvRV_set(gv, NULL);
397 SvROK_off(gv);
398 }
463ee0b2 399
3b6733bf
NC		 400
401 if (old_type < SVt_PVGV) {
402 if (old_type >= SVt_PV)
403 SvCUR_set(gv, 0);
ad64d0ec 404 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 405 }
55d729e4
GS		 406 if (SvLEN(gv)) {
407 if (proto) {
f880fe2f 408 SvPV_set(gv, NULL);
b162af07 409 SvLEN_set(gv, 0);
55d729e4
GS		 410 SvPOK_off(gv);
411 } else
94010e71 412 Safefree(SvPVX_mutable(gv));
55d729e4 413 }
2e5b91de
NC		 414 SvIOK_off(gv);
415 isGV_with_GP_on(gv);
12816592 416
6881372e
FC		 417 if (really_sub && !CvISXSUB(has_constant) && CvSTART(has_constant)
418 && ( CvSTART(has_constant)->op_type == OP_NEXTSTATE
419 || CvSTART(has_constant)->op_type == OP_DBSTATE))
420 PL_curcop = (COP *)CvSTART(has_constant);
c43ae56f 421 GvGP_set(gv, Perl_newGP(aTHX_ gv));
6881372e 422 PL_curcop = old;
e15faf7d
NC		 423 GvSTASH(gv) = stash;
424 if (stash)
ad64d0ec 425 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 426 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 427 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
428 GvMULTI_on(gv); /* _was_ mentioned */
6881372e 429 if (really_sub) {
2eaf799e
FC		 430 /* Not actually a constant. Just a regular sub. */
431 CV * const cv = (CV *)has_constant;
432 GvCV_set(gv,cv);
790acdde 433 if (CvNAMED(cv) && CvSTASH(cv) == stash && (
2eaf799e
FC		 434 CvNAME_HEK(cv) == GvNAME_HEK(gv)
435 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
436 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
437 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
438 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
439 )
440 ))
441 CvGV_set(cv,gv);
442 }
443 else if (doproto) {
e3d2b9e7 444 CV *cv;
756cb477
NC		 445 if (has_constant) {
446 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 447 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 448 /* In case op.c:S_process_special_blocks stole it: */
449 if (!GvCV(gv))
c43ae56f 450 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 451 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 452 /* If this reference was a copy of another, then the subroutine
453 must have been "imported", by a Perl space assignment to a GV
454 from a reference to CV. */
455 if (exported_constant)
456 GvIMPORTED_CV_on(gv);
186a5ba8 457 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 458 } else {
186a5ba8 459 cv = newSTUB(gv,1);
756cb477 460 }
55d729e4 461 if (proto) {
e3d2b9e7 462 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 463 SV_HAS_TRAILING_NUL);
e0260a5b 464 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 465 }
466 }
463ee0b2
LW		 467}
468
76e3520e 469STATIC void
e6066781 470S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 471{
13c59d41
MH		 472 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
473
474 switch (sv_type) {
475 case SVt_PVIO:
476 (void)GvIOn(gv);
477 break;
478 case SVt_PVAV:
479 (void)GvAVn(gv);
480 break;
481 case SVt_PVHV:
482 (void)GvHVn(gv);
483 break;
c69033f2 484#ifdef PERL_DONT_CREATE_GVSV
13c59d41
MH		 485 case SVt_NULL:
486 case SVt_PVCV:
487 case SVt_PVFM:
488 case SVt_PVGV:
489 break;
490 default:
491 if(GvSVn(gv)) {
492 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
493 If we just cast GvSVn(gv) to void, it ignores evaluating it for
494 its side effect */
495 }
c69033f2 496#endif
a0d0e21e
LW		 497 }
498}
499
0f8d4b5e
FC		 500static void core_xsub(pTHX_ CV* cv);
501
502static GV *
503S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 504 const char * const name, const STRLEN len)
0f8d4b5e
FC		 505{
506 const int code = keyword(name, len, 1);
507 static const char file[] = __FILE__;
97021f77 508 CV *cv, *oldcompcv = NULL;
0f8d4b5e 509 int opnum = 0;
0f8d4b5e 510 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 511 COP *oldcurcop = NULL;
512 yy_parser *oldparser = NULL;
513 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 514
515 assert(gv || stash);
516 assert(name);
0f8d4b5e 517
88b892d8
FC		 518 if (!code) return NULL; /* Not a keyword */
519 switch (code < 0 ? -code : code) {
0f8d4b5e 520 /* no support for \&CORE::infix;
d885f758 521 no support for funcs that do not parse like funcs */
88b892d8 522 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 523 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
7896dde7 524 case KEY_default : case KEY_DESTROY:
88b892d8 525 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 526 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 527 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
813e85a0
PE		 528 case KEY_given : case KEY_goto : case KEY_grep : case KEY_gt :
529 case KEY_if : case KEY_isa : case KEY_INIT : case KEY_last :
530 case KEY_le : case KEY_local : case KEY_lt : case KEY_m :
531 case KEY_map : case KEY_my:
88b892d8 532 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 533 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 534 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 535 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 536 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 537 case KEY_state: case KEY_sub :
46bef06f 538 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
7896dde7 539 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
88b892d8 540 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 541 return NULL;
542 case KEY_chdir:
eb31eb35 543 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
73665bc4 544 case KEY_eof : case KEY_exec: case KEY_exists :
0f8d4b5e 545 case KEY_lstat:
bea284c8 546 case KEY_split:
0f8d4b5e
FC		 547 case KEY_stat:
548 case KEY_system:
549 case KEY_truncate: case KEY_unlink:
0f8d4b5e
FC		 550 ampable = FALSE;
551 }
552 if (!gv) {
553 gv = (GV *)newSV(0);
554 gv_init(gv, stash, name, len, TRUE);
555 }
7e68c38b 556 GvMULTI_on(gv);
0f8d4b5e
FC		 557 if (ampable) {
558 ENTER;
559 oldcurcop = PL_curcop;
560 oldparser = PL_parser;
561 lex_start(NULL, NULL, 0);
562 oldcompcv = PL_compcv;
563 PL_compcv = NULL; /* Prevent start_subparse from setting
564 CvOUTSIDE. */
565 oldsavestack_ix = start_subparse(FALSE,0);
566 cv = PL_compcv;
567 }
568 else {
569 /* Avoid calling newXS, as it calls us, and things start to
570 get hairy. */
571 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
572 GvCV_set(gv,cv);
573 GvCVGEN(gv) = 0;
0f8d4b5e
FC		 574 CvISXSUB_on(cv);
575 CvXSUB(cv) = core_xsub;
eacbb379 576 PoisonPADLIST(cv);
0f8d4b5e
FC		 577 }
578 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
579 from PL_curcop. */
9b669ea1
DD		 580 /* XSUBs can't be perl lang/perl5db.pl debugged
581 if (PERLDB_LINE_OR_SAVESRC)
582 (void)gv_fetchfile(file); */
0f8d4b5e
FC		 583 CvFILE(cv) = (char *)file;
584 /* XXX This is inefficient, as doing things this order causes
585 a prototype check in newATTRSUB. But we have to do
586 it this order as we need an op number before calling
587 new ATTRSUB. */
588 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 589 if (stash)
73c02f15 590 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 591 if (ampable) {
4428fb0e
TC		 592#ifdef DEBUGGING
593 CV *orig_cv = cv;
594#endif
0f8d4b5e 595 CvLVALUE_on(cv);
4428fb0e
TC		 596 /* newATTRSUB will free the CV and return NULL if we're still
597 compiling after a syntax error */
e8f91c91 598 if ((cv = newATTRSUB_x(
7e68c38b 599 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 600 NULL,NULL,
601 coresub_op(
602 opnum
603 ? newSVuv((UV)opnum)
604 : newSVpvn(name,len),
605 code, opnum
7e68c38b 606 ),
e8f91c91 607 TRUE
4428fb0e
TC		 608 )) != NULL) {
609 assert(GvCV(gv) == orig_cv);
610 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
cd642408 611 && opnum != OP_UNDEF && opnum != OP_KEYS)
4428fb0e
TC		 612 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
613 }
0f8d4b5e
FC		 614 LEAVE;
615 PL_parser = oldparser;
616 PL_curcop = oldcurcop;
617 PL_compcv = oldcompcv;
618 }
4428fb0e 619 if (cv) {
a83b92fa
Z		 620 SV *opnumsv = newSViv(
621 (opnum == OP_ENTEREVAL && len == 9 && memEQ(name, "evalbytes", 9)) ?
622 (OP_ENTEREVAL | (1<<16))
623 : opnum ? opnum : (((I32)name[2]) << 16));
624 cv_set_call_checker_flags(cv, Perl_ck_entersub_args_core, opnumsv, 0);
625 SvREFCNT_dec_NN(opnumsv);
4428fb0e
TC		 626 }
627
0f8d4b5e
FC		 628 return gv;
629}
630
954c1994 631/*
6c53d59b
FC		 632=for apidoc gv_fetchmeth
633
634Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
635
e6919483
BF		 636=for apidoc gv_fetchmeth_sv
637
638Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
639of an SV instead of a string/length pair.
640
641=cut
642*/
643
644GV *
645Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
646{
c290e187 647 char *namepv;
648 STRLEN namelen;
649 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
650 if (LIKELY(SvPOK_nog(namesv))) /* common case */
14062320
FC		 651 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level,
652 flags | SvUTF8(namesv));
c290e187 653 namepv = SvPV(namesv, namelen);
654 if (SvUTF8(namesv)) flags |= SVf_UTF8;
655 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF		 656}
657
658/*
659=for apidoc gv_fetchmeth_pv
660
661Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
662instead of a string/length pair.
663
664=cut
665*/
666
667GV *
668Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
669{
670 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 671 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF		 672}
673
674/*
675=for apidoc gv_fetchmeth_pvn
954c1994
GS		 676
677Returns the glob with the given C<name> and a defined subroutine or
678C<NULL>. The glob lives in the given C<stash>, or in the stashes
796b6530 679accessible via C<@ISA> and C<UNIVERSAL::>.
954c1994
GS		 680
681The argument C<level> should be either 0 or -1. If C<level==0>, as a
682side-effect creates a glob with the given C<name> in the given C<stash>
683which in the case of success contains an alias for the subroutine, and sets
e1a479c5 684up caching info for this glob.
954c1994 685
796b6530 686The only significant values for C<flags> are C<GV_SUPER> and C<SVf_UTF8>.
aae43805 687
796b6530 688C<GV_SUPER> indicates that we want to look up the method in the superclasses
aae43805 689of the C<stash>.
e6919483 690
aae43805 691The
954c1994 692GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 693visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 694the GV directly; instead, you should use the method's CV, which can be
b267980d 695obtained from the GV with the C<GvCV> macro.
954c1994 696
4f8d487a
KW		 697=for apidoc Amnh||GV_SUPER
698
954c1994
GS		 699=cut
700*/
701
e1a479c5
BB		 702/* NOTE: No support for tied ISA */
703
c6afe666 704PERL_STATIC_INLINE GV*
705S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 706{
463ee0b2 707 GV** gvp;
c6afe666 708 HE* he;
e1a479c5
BB		 709 AV* linear_av;
710 SV** linear_svp;
711 SV* linear_sv;
aae43805 712 HV* cstash, *cachestash;
e1a479c5
BB		 713 GV* candidate = NULL;
714 CV* cand_cv = NULL;
e1a479c5 715 GV* topgv = NULL;
bfcb3514 716 const char *hvname;
448aac91 717 STRLEN hvnamelen;
c6afe666 718 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 719 I32 items;
e1a479c5 720 U32 topgen_cmp;
04f3bf56 721 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 722
af09ea45
IK		 723 /* UNIVERSAL methods should be callable without a stash */
724 if (!stash) {
e1a479c5 725 create = 0; /* probably appropriate */
da51bb9b 726 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 727 return 0;
728 }
729
e1a479c5
BB		 730 assert(stash);
731
bfcb3514 732 hvname = HvNAME_get(stash);
448aac91 733 hvnamelen = HvNAMELEN_get(stash);
bfcb3514 734 if (!hvname)
e1a479c5 735 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 736
e1a479c5 737 assert(hvname);
55df6700 738 assert(name || meth);
463ee0b2 739
aae43805 740 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC		 741 flags & GV_SUPER ? "SUPER " : "",
742 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 743
dd69841b 744 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 745
aae43805 746 if (flags & GV_SUPER) {
1a33a059
FC		 747 if (!HvAUX(stash)->xhv_mro_meta->super)
748 HvAUX(stash)->xhv_mro_meta->super = newHV();
749 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC		 750 }
751 else cachestash = stash;
752
e1a479c5 753 /* check locally for a real method or a cache entry */
c6afe666 754 he = (HE*)hv_common(
1cde3371 755 cachestash, meth, name, len, is_utf8 ? HVhek_UTF8 : 0, create, NULL, 0
c6afe666 756 );
757 if (he) gvp = (GV**)&HeVAL(he);
758 else gvp = NULL;
759
e1a479c5
BB		 760 if(gvp) {
761 topgv = *gvp;
0f8d4b5e 762 have_gv:
e1a479c5
BB		 763 assert(topgv);
764 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC		 765 {
766 if (!name)
767 name = SvPV_nomg(meth, len);
04ec7e59 768 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 769 }
e1a479c5
BB		 770 if ((cand_cv = GvCV(topgv))) {
771 /* If genuine method or valid cache entry, use it */
772 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
773 return topgv;
774 }
775 else {
776 /* stale cache entry, junk it and move on */
e7881358 777 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 778 GvCV_set(topgv, NULL);
779 cand_cv = NULL;
e1a479c5
BB		 780 GvCVGEN(topgv) = 0;
781 }
782 }
783 else if (GvCVGEN(topgv) == topgen_cmp) {
784 /* cache indicates no such method definitively */
785 return 0;
786 }
aae43805 787 else if (stash == cachestash
b59bf0b2
KW		 788 && len > 1 /* shortest is uc */
789 && memEQs(hvname, HvNAMELEN_get(stash), "CORE")
87566176 790 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 791 goto have_gv;
463ee0b2 792 }
79072805 793
aae43805 794 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 795 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
796 items = AvFILLp(linear_av); /* no +1, to skip over self */
797 while (items--) {
798 linear_sv = *linear_svp++;
799 assert(linear_sv);
800 cstash = gv_stashsv(linear_sv, 0);
801
dd69841b 802 if (!cstash) {
448aac91
MM		 803 if ( ckWARN(WARN_SYNTAX)) {
804 if( /* these are loaded from Perl_Gv_AMupdate() one way or another */
805 ( len && name[0] == '(' ) /* overload.pm related, in particular "()" */
806 || ( memEQs( name, len, "DESTROY") )
807 ) {
808 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
809 "Can't locate package %" SVf " for @%" HEKf "::ISA",
810 SVfARG(linear_sv),
811 HEKfARG(HvNAME_HEK(stash)));
812
813 } else if( memEQs( name, len, "AUTOLOAD") ) {
814 /* gobble this warning */
815 } else {
816 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
817 "While trying to resolve method call %.*s->%.*s()"
320be181
KW		 818 " can not locate package \"%" SVf "\" yet it is mentioned in @%.*s::ISA"
819 " (perhaps you forgot to load \"%" SVf "\"?)",
29a3370f
N		 820 (int) hvnamelen, hvname,
821 (int) len, name,
448aac91 822 SVfARG(linear_sv),
29a3370f 823 (int) hvnamelen, hvname,
448aac91
MM		 824 SVfARG(linear_sv));
825 }
826 }
e1a479c5
BB		 827 continue;
828 }
9607fc9c 829
e1a479c5
BB		 830 assert(cstash);
831
202cd98a
SA		 832 gvp = (GV**)hv_common(
833 cstash, meth, name, len, is_utf8 ? HVhek_UTF8 : 0, HV_FETCH_JUST_SV, NULL, 0
834 );
0f8d4b5e
FC		 835 if (!gvp) {
836 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
837 const char *hvname = HvNAME(cstash); assert(hvname);
c8b388b0 838 if (strBEGINs(hvname, "CORE")
0f8d4b5e 839 && (candidate =
87566176 840 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 841 ))
842 goto have_candidate;
843 }
844 continue;
845 }
846 else candidate = *gvp;
847 have_candidate:
e1a479c5 848 assert(candidate);
04f3bf56 849 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 850 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 851 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
852 /*
853 * Found real method, cache method in topgv if:
854 * 1. topgv has no synonyms (else inheritance crosses wires)
855 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
856 */
857 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 858 CV *old_cv = GvCV(topgv);
859 SvREFCNT_dec(old_cv);
e1a479c5 860 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 861 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 862 GvCVGEN(topgv) = topgen_cmp;
863 }
864 return candidate;
865 }
866 }
9607fc9c 867
e1a479c5
BB		 868 /* Check UNIVERSAL without caching */
869 if(level == 0 || level == -1) {
55df6700
FC		 870 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
871 flags &~GV_SUPER);
e1a479c5
BB		 872 if(candidate) {
873 cand_cv = GvCV(candidate);
874 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 875 CV *old_cv = GvCV(topgv);
876 SvREFCNT_dec(old_cv);
e1a479c5 877 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 878 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 879 GvCVGEN(topgv) = topgen_cmp;
880 }
881 return candidate;
882 }
883 }
884
885 if (topgv && GvREFCNT(topgv) == 1) {
886 /* cache the fact that the method is not defined */
887 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 888 }
889
79072805
LW		 890 return 0;
891}
892
c6afe666 893GV *
894Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
895{
896 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
897 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
898}
899
954c1994 900/*
460e5730
FC		 901=for apidoc gv_fetchmeth_autoload
902
903This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
904parameter.
905
d21989ed 906=for apidoc gv_fetchmeth_sv_autoload
611c1e95 907
d21989ed
BF		 908Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
909of an SV instead of a string/length pair.
910
911=cut
912*/
913
914GV *
915Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
916{
917 char *namepv;
918 STRLEN namelen;
919 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
920 namepv = SvPV(namesv, namelen);
921 if (SvUTF8(namesv))
922 flags |= SVf_UTF8;
923 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
924}
925
926/*
927=for apidoc gv_fetchmeth_pv_autoload
928
929Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
930instead of a string/length pair.
931
932=cut
933*/
934
935GV *
936Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
937{
938 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
939 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
940}
941
942/*
943=for apidoc gv_fetchmeth_pvn_autoload
944
796b6530 945Same as C<gv_fetchmeth_pvn()>, but looks for autoloaded subroutines too.
611c1e95
IZ		 946Returns a glob for the subroutine.
947
948For an autoloaded subroutine without a GV, will create a GV even
796b6530 949if C<level < 0>. For an autoloaded subroutine without a stub, C<GvCV()>
611c1e95
IZ		 950of the result may be zero.
951
796b6530 952Currently, the only significant value for C<flags> is C<SVf_UTF8>.
d21989ed 953
611c1e95
IZ		 954=cut
955*/
956
957GV *
d21989ed 958Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 959{
499321d3 960 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 961
d21989ed 962 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 963
611c1e95 964 if (!gv) {
611c1e95
IZ		 965 CV *cv;
966 GV **gvp;
967
968 if (!stash)
6136c704 969 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 970 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 971 return NULL;
d21989ed 972 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 973 return NULL;
611c1e95
IZ		 974 cv = GvCV(gv);
975 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 976 return NULL;
611c1e95
IZ		 977 /* Have an autoload */
978 if (level < 0) /* Cannot do without a stub */
d21989ed 979 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 980 gvp = (GV**)hv_fetch(stash, name,
981 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 982 if (!gvp)
6136c704 983 return NULL;
611c1e95
IZ		 984 return *gvp;
985 }
986 return gv;
987}
988
989/*
954c1994
GS		 990=for apidoc gv_fetchmethod_autoload
991
992Returns the glob which contains the subroutine to call to invoke the method
993on the C<stash>. In fact in the presence of autoloading this may be the
796b6530 994glob for "AUTOLOAD". In this case the corresponding variable C<$AUTOLOAD> is
b267980d 995already setup.
954c1994
GS		 996
997The third parameter of C<gv_fetchmethod_autoload> determines whether
998AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 999means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 1000Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 1001with a non-zero C<autoload> parameter.
954c1994 1002
cec2d7b1
FC		 1003These functions grant C<"SUPER"> token
1004as a prefix of the method name. Note
954c1994
GS		 1005that if you want to keep the returned glob for a long time, you need to
1006check for it being "AUTOLOAD", since at the later time the call may load a
796b6530 1007different subroutine due to C<$AUTOLOAD> changing its value. Use the glob
cec2d7b1 1008created as a side effect to do this.
954c1994 1009
cec2d7b1
FC		 1010These functions have the same side-effects as C<gv_fetchmeth> with
1011C<level==0>. The warning against passing the GV returned by
1012C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS		 1013
1014=cut
1015*/
1016
dc848c6f 1017GV *
864dbfa3 1018Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 1019{
547bb267
NC		 1020 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
1021
256d1bb2
NC		 1022 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
1023}
1024
44130a26
BF		 1025GV *
1026Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
1027{
1028 char *namepv;
1029 STRLEN namelen;
1030 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
1031 namepv = SvPV(namesv, namelen);
1032 if (SvUTF8(namesv))
1033 flags |= SVf_UTF8;
1034 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
1035}
1036
1037GV *
1038Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1039{
1040 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1041 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1042}
1043
256d1bb2 1044GV *
44130a26 1045Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1046{
65308f87
YO		 1047 const char * const origname = name;
1048 const char * const name_end = name + len;
e2cace1e 1049 const char *last_separator = NULL;
a0d0e21e 1050 GV* gv;
0dae17bd 1051 HV* ostash = stash;
ad64d0ec 1052 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 1053 const U32 autoload = flags & GV_AUTOLOAD;
1054 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1055 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1056
44130a26 1057 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1058
eff494dd 1059 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1060 stash = NULL;
c9bf4021 1061 else {
e2cace1e 1062 /* The only way stash can become NULL later on is if last_separator is set,
c9bf4021
NC		 1063 which in turn means that there is no need for a SVt_PVHV case
1064 the error reporting code. */
1065 }
b267980d 1066
cfb73676
YO		 1067 {
1068 /* check if the method name is fully qualified or
1069 * not, and separate the package name from the actual
1070 * method name.
1071 *
1072 * leaves last_separator pointing to the beginning of the
1073 * last package separator (either ' or ::) or 0
1074 * if none was found.
1075 *
1076 * leaves name pointing at the beginning of the
1077 * method name.
1078 */
1079 const char *name_cursor = name;
1080 const char * const name_em1 = name_end - 1; /* name_end minus 1 */
1081 for (name_cursor = name; name_cursor < name_end ; name_cursor++) {
1082 if (*name_cursor == '\'') {
1083 last_separator = name_cursor;
1084 name = name_cursor + 1;
1085 }
1086 else if (name_cursor < name_em1 && *name_cursor == ':' && name_cursor[1] == ':') {
1087 last_separator = name_cursor++;
1088 name = name_cursor + 1;
1089 }
1090 }
a0d0e21e 1091 }
cfb73676
YO		 1092
1093 /* did we find a separator? */
e2cace1e 1094 if (last_separator) {
9b7f107c
YO		 1095 STRLEN sep_len= last_separator - origname;
1096 if ( memEQs(origname, sep_len, "SUPER")) {
9607fc9c 1097 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 1098 stash = CopSTASH(PL_curcop);
1099 flags |= GV_SUPER;
cea2e8a9 1100 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1101 origname, HvENAME_get(stash), name) );
4633a7c4 1102 }
47324b4e
KW		 1103 else if ( sep_len >= 7 &&
1104 strBEGINs(last_separator - 7, "::SUPER")) {
aae43805 1105 /* don't autovifify if ->NoSuchStash::SUPER::method */
9b7f107c 1106 stash = gv_stashpvn(origname, sep_len - 7, is_utf8);
aae43805
FC		 1107 if (stash) flags |= GV_SUPER;
1108 }
e189a56d 1109 else {
af09ea45 1110 /* don't autovifify if ->NoSuchStash::method */
9b7f107c 1111 stash = gv_stashpvn(origname, sep_len, is_utf8);
e189a56d 1112 }
0dae17bd 1113 ostash = stash;
4633a7c4
LW		 1114 }
1115
65308f87 1116 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags);
a0d0e21e 1117 if (!gv) {
7da9d78d
AB		 1118 /* This is the special case that exempts Foo->import and
1119 Foo->unimport from being an error even if there's no
1120 import/unimport subroutine */
0740a29d
Z		 1121 if (strEQ(name,"import") || strEQ(name,"unimport")) {
1122 gv = (GV*)sv_2mortal((SV*)newCONSTSUB_flags(NULL,
1123 NULL, 0, 0, NULL));
1124 } else if (autoload)
c8416c26 1125 gv = gv_autoload_pvn(
65308f87 1126 ostash, name, name_end - name, GV_AUTOLOAD_ISMETHOD|flags
c8416c26 1127 );
256d1bb2
NC		 1128 if (!gv && do_croak) {
1129 /* Right now this is exclusively for the benefit of S_method_common
1130 in pp_hot.c */
1131 if (stash) {
15e6cdd9
DG		 1132 /* If we can't find an IO::File method, it might be a call on
1133 * a filehandle. If IO:File has not been loaded, try to
1134 * require it first instead of croaking */
1135 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1136 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1137 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1138 STR_WITH_LEN("IO/File.pm"), 0,
1139 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1140 ) {
31b05a0f 1141 require_pv("IO/File.pm");
65308f87 1142 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags);
15e6cdd9
DG		 1143 if (gv)
1144 return gv;
1145 }
256d1bb2 1146 Perl_croak(aTHX_
147e3846
KW		 1147 "Can't locate object method \"%" UTF8f
1148 "\" via package \"%" HEKf "\"",
65308f87 1149 UTF8fARG(is_utf8, name_end - name, name),
d0c0e7dd 1150 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1151 }
1152 else {
ecad31f0 1153 SV* packnamesv;
256d1bb2 1154
e2cace1e
YO		 1155 if (last_separator) {
1156 packnamesv = newSVpvn_flags(origname, last_separator - origname,
ecad31f0 1157 SVs_TEMP | is_utf8);
256d1bb2 1158 } else {
017c5e4e 1159 packnamesv = error_report;
256d1bb2
NC		 1160 }
1161
1162 Perl_croak(aTHX_
147e3846
KW		 1163 "Can't locate object method \"%" UTF8f
1164 "\" via package \"%" SVf "\""
1165 " (perhaps you forgot to load \"%" SVf "\"?)",
65308f87 1166 UTF8fARG(is_utf8, name_end - name, name),
ecad31f0 1167 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1168 }
1169 }
463ee0b2 1170 }
dc848c6f 1171 else if (autoload) {
9d4ba2ae 1172 CV* const cv = GvCV(gv);
09280a33
CS		 1173 if (!CvROOT(cv) && !CvXSUB(cv)) {
1174 GV* stubgv;
1175 GV* autogv;
1176
0c028dca 1177 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS		 1178 stubgv = gv;
1179 else {
1180 stubgv = CvGV(cv);
1181 if (GvCV(stubgv) != cv) /* orphaned import */
1182 stubgv = gv;
1183 }
c8416c26
BF		 1184 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1185 GvNAME(stubgv), GvNAMELEN(stubgv),
1186 GV_AUTOLOAD_ISMETHOD
1187 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1188 if (autogv)
1189 gv = autogv;
1190 }
1191 }
44a8e56a 1192
1193 return gv;
1194}
1195
1196GV*
0eeb01b9 1197Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1198{
1199 char *namepv;
1200 STRLEN namelen;
0fe84f7c 1201 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1202 namepv = SvPV(namesv, namelen);
1203 if (SvUTF8(namesv))
1204 flags |= SVf_UTF8;
0eeb01b9 1205 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1206}
1207
1208GV*
0eeb01b9 1209Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1210{
0fe84f7c 1211 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1212 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1213}
1214
1215GV*
0eeb01b9 1216Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1217{
44a8e56a 1218 GV* gv;
1219 CV* cv;
1220 HV* varstash;
1221 GV* vargv;
1222 SV* varsv;
c8416c26
BF		 1223 SV *packname = NULL;
1224 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1225
0fe84f7c 1226 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1227
7edbdc6b 1228 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1229 return NULL;
0dae17bd
GS		 1230 if (stash) {
1231 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1232 STRLEN packname_len = 0;
1233 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1234 packname = newSVpvn_flags(packname_ptr, packname_len,
1235 SVs_TEMP | SvUTF8(stash));
5c284bb0 1236 stash = NULL;
0dae17bd 1237 }
c8416c26
BF		 1238 else
1239 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1240 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1241 }
257dc59d
FC		 1242 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1243 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1244 return NULL;
dc848c6f 1245 cv = GvCV(gv);
1246
adb5a9ae 1247 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1248 return NULL;
ed850460 1249
dc848c6f 1250 /*
64278e8c 1251 * Inheriting AUTOLOAD for non-methods no longer works
dc848c6f 1252 */
0eeb01b9
FC		 1253 if (
1254 !(flags & GV_AUTOLOAD_ISMETHOD)
1255 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1256 )
64278e8c
A		 1257 Perl_croak(aTHX_ "Use of inherited AUTOLOAD for non-method %" SVf
1258 "::%" UTF8f "() is no longer allowed",
ecad31f0 1259 SVfARG(packname),
b17a0679 1260 UTF8fARG(is_utf8, len, name));
44a8e56a 1261
aed2304a 1262 if (CvISXSUB(cv)) {
bb619f37
FC		 1263 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1264 * and split that value on the last '::', pass along the same data
1265 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1266 *
1267 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1268 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1269 * type. Since SvPVX has been documented as returning the sub name
1270 * for a long time, but not as returning the prototype, we have
1271 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1272 * elsewhere.
1273 *
1274 * We put the prototype in the same allocated buffer, but after
1275 * the sub name. The SvPOK flag indicates the presence of a proto-
1276 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1277 * If both flags are on, then SvLEN is used to indicate the end of
1278 * the prototype (artificially lower than what is actually allo-
1279 * cated), at the risk of having to reallocate a few bytes unneces-
1280 * sarily--but that should happen very rarely, if ever.
1281 *
1282 * We use SvUTF8 for both prototypes and sub names, so if one is
1283 * UTF8, the other must be upgraded.
adb5a9ae 1284 */
c68d9564 1285 CvSTASH_set(cv, stash);
8fa6a409 1286 if (SvPOK(cv)) { /* Ouch! */
e7881358 1287 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1288 STRLEN ulen;
1289 const char *proto = CvPROTO(cv);
1290 assert(proto);
1291 if (SvUTF8(cv))
1292 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1293 ulen = SvCUR(tmpsv);
2324bdb9 1294 SvCUR_set(tmpsv, SvCUR(tmpsv) + 1); /* include null in string */
8fa6a409
FC		 1295 sv_catpvn_flags(
1296 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1297 );
1298 SvTEMP_on(tmpsv); /* Allow theft */
1299 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1300 SvTEMP_off(tmpsv);
e7881358 1301 SvREFCNT_dec_NN(tmpsv);
59c3c222 1302 SvLEN_set(cv, SvCUR(cv) + 1);
2324bdb9 1303 SvCUR_set(cv, ulen);
8fa6a409
FC		 1304 }
1305 else {
1306 sv_setpvn((SV *)cv, name, len);
1307 SvPOK_off(cv);
1308 if (is_utf8)
c8416c26 1309 SvUTF8_on(cv);
8fa6a409
FC		 1310 else SvUTF8_off(cv);
1311 }
1312 CvAUTOLOAD_on(cv);
adb5a9ae 1313 }
adb5a9ae 1314
44a8e56a 1315 /*
1316 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1317 * The subroutine's original name may not be "AUTOLOAD", so we don't
1318 * use that, but for lack of anything better we will use the sub's
1319 * original package to look up $AUTOLOAD.
1320 */
18691622 1321 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1322 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1323 ENTER;
1324
c69033f2 1325 if (!isGV(vargv)) {
04ec7e59 1326 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1327#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1328 GvSV(vargv) = newSV(0);
c69033f2
NC		 1329#endif
1330 }
3d35f11b 1331 LEAVE;
e203899d 1332 varsv = GvSVn(vargv);
4bac9ae4
CS		 1333 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1334 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1335 sv_setsv(varsv, packname);
396482e1 1336 sv_catpvs(varsv, "::");
d40bf27b
NC		 1337 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1338 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1339 sv_catpvn_flags(
1340 varsv, name, len,
5bcd1ef4 1341 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1342 );
c8416c26
BF		 1343 if (is_utf8)
1344 SvUTF8_on(varsv);
a0d0e21e
LW		 1345 return gv;
1346}
1347
44a2ac75
YO		 1348
1349/* require_tie_mod() internal routine for requiring a module
486ec47a 1350 * that implements the logic of automatic ties like %! and %-
e94ea821
FC		 1351 * It loads the module and then calls the _tie_it subroutine
1352 * with the passed gv as an argument.
44a2ac75
YO		 1353 *
1354 * The "gv" parameter should be the glob.
ee33cc1a 1355 * "varname" holds the 1-char name of the var, used for error messages.
45cbc99a 1356 * "namesv" holds the module name. Its refcount will be decremented.
45cbc99a 1357 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1358 * For the protection of $! to work (it is set by this routine)
1359 * the sv slot must already be magicalized.
d2c93421 1360 */
e94ea821 1361STATIC void
ee33cc1a 1362S_require_tie_mod(pTHX_ GV *gv, const char varname, const char * name,
a1683482 1363 STRLEN len, const U32 flags)
d2c93421 1364{
e94ea821 1365 const SV * const target = varname == '[' ? GvSV(gv) : (SV *)GvHV(gv);
45cbc99a 1366
7918f24d
NC		 1367 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1368
e94ea821
FC		 1369 /* If it is not tied */
1370 if (!target || !SvRMAGICAL(target)
1371 || !mg_find(target,
1372 varname == '[' ? PERL_MAGIC_tiedscalar : PERL_MAGIC_tied))
1373 {
1374 HV *stash;
1375 GV **gvp;
1376 dSP;
1377
655f5b26 1378 PUSHSTACKi(PERLSI_MAGIC);
e94ea821 1379 ENTER;
e94ea821 1380
6881372e
FC		 1381#define GET_HV_FETCH_TIE_FUNC \
1382 ( (gvp = (GV **)hv_fetchs(stash, "_tie_it", 0)) \
1383 && *gvp \
1384 && ( (isGV(*gvp) && GvCV(*gvp)) \
1385 || (SvROK(*gvp) && SvTYPE(SvRV(*gvp)) == SVt_PVCV) ) \
1386 )
e94ea821
FC		 1387
1388 /* Load the module if it is not loaded. */
360cebfd 1389 if (!(stash = gv_stashpvn(name, len, 0))
6881372e 1390 || ! GET_HV_FETCH_TIE_FUNC)
e94ea821 1391 {
360cebfd 1392 SV * const module = newSVpvn(name, len);
b82b06b8 1393 const char type = varname == '[' ? '$' : '%';
44a2ac75 1394 if ( flags & 1 )
45cbc99a 1395 save_scalar(gv);
5b2ef88e 1396 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1397 assert(sp == PL_stack_sp);
360cebfd 1398 stash = gv_stashpvn(name, len, 0);
44a2ac75 1399 if (!stash)
360cebfd
FC		 1400 Perl_croak(aTHX_ "panic: Can't use %c%c because %s is not available",
1401 type, varname, name);
6881372e 1402 else if (! GET_HV_FETCH_TIE_FUNC)
360cebfd
FC		 1403 Perl_croak(aTHX_ "panic: Can't use %c%c because %s does not define _tie_it",
1404 type, varname, name);
e94ea821
FC		 1405 }
1406 /* Now call the tie function. It should be in *gvp. */
6881372e 1407 assert(gvp); assert(*gvp);
e94ea821
FC		 1408 PUSHMARK(SP);
1409 XPUSHs((SV *)gv);
1410 PUTBACK;
1411 call_sv((SV *)*gvp, G_VOID|G_DISCARD);
1412 LEAVE;
655f5b26 1413 POPSTACK;
d2c93421
RH		 1414 }
1415}
1416
7c719134
YO		 1417/* add a require_tie_mod_s - the _s suffix is similar to pvs type suffixes,
1418 * IOW it means we do STR_WITH_LEN() ourselves and the user should pass in
1419 * a true string WITHOUT a len.
1420 */
1421#define require_tie_mod_s(gv, varname, name, flags) \
1422 S_require_tie_mod(aTHX_ gv, varname, STR_WITH_LEN(name), flags)
1423
954c1994
GS		 1424/*
1425=for apidoc gv_stashpv
1426
da51bb9b 1427Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1428determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1429
1430=cut
1431*/
1432
a0d0e21e 1433HV*
864dbfa3 1434Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1435{
7918f24d 1436 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1437 return gv_stashpvn(name, strlen(name), create);
1438}
1439
bc96cb06
SH		 1440/*
1441=for apidoc gv_stashpvn
1442
da51bb9b
NC		 1443Returns a pointer to the stash for a specified package. The C<namelen>
1444parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1445to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1446created if it does not already exist. If the package does not exist and
796b6530 1447C<flags> is 0 (or any other setting that does not create packages) then C<NULL>
da51bb9b
NC		 1448is returned.
1449
566a4718
YO		 1450Flags may be one of:
1451
1452 GV_ADD
1453 SVf_UTF8
1454 GV_NOADD_NOINIT
1455 GV_NOINIT
1456 GV_NOEXPAND
1457 GV_ADDMG
1458
796b6530 1459The most important of which are probably C<GV_ADD> and C<SVf_UTF8>.
bc96cb06 1460
808724c8 1461Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1462recommended for performance reasons.
1463
4f8d487a
KW		 1464=for apidoc Amnh||GV_ADD
1465
bc96cb06
SH		 1466=cut
1467*/
1468
0eadbdad
YO		 1469/*
1470gv_stashpvn_internal
1471
1472Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1473as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1474
1475*/
1476
4e7ebec5 1477PERL_STATIC_INLINE HV*
0eadbdad 1478S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1479{
0cea0058 1480 char smallbuf[128];
46fc3d4c 1481 char *tmpbuf;
a0d0e21e
LW		 1482 HV *stash;
1483 GV *tmpgv;
add0ecde 1484 U32 tmplen = namelen + 2;
dc437b57 1485
0eadbdad 1486 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1487
add0ecde 1488 if (tmplen <= sizeof smallbuf)
46fc3d4c 1489 tmpbuf = smallbuf;
1490 else
add0ecde
VP		 1491 Newx(tmpbuf, tmplen, char);
1492 Copy(name, tmpbuf, namelen, char);
1493 tmpbuf[namelen] = ':';
1494 tmpbuf[namelen+1] = ':';
1495 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1496 if (tmpbuf != smallbuf)
1497 Safefree(tmpbuf);
d2fcb1d6 1498 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1499 return NULL;
a0d0e21e 1500 stash = GvHV(tmpgv);
1f656fcf 1501 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1502 assert(stash);
1f656fcf 1503 if (!HvNAME_get(stash)) {
0be4d16f 1504 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1505
1506 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1507 /* If the containing stash has multiple effective
1508 names, see that this one gets them, too. */
1509 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1510 mro_package_moved(stash, NULL, tmpgv, 1);
1511 }
a0d0e21e 1512 return stash;
463ee0b2
LW		 1513}
1514
808724c8 1515/*
1516gv_stashsvpvn_cached
1517
1518Returns a pointer to the stash for a specified package, possibly
48a81373 1519cached. Implements both C<gv_stashpvn> and C<gv_stashsv>.
808724c8 1520
1521Requires one of either namesv or namepv to be non-null.
1522
fbe13c60 1523See C<L</gv_stashpvn>> for details on "flags".
808724c8 1524
1525Note the sv interface is strongly preferred for performance reasons.
1526
1527*/
1528
1529#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1530 assert(namesv || name)
1531
c4b6b96d
SA		 1532HV*
1533Perl_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1534{
1535 HV* stash;
808724c8 1536 HE* he;
1537
1538 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1539
1540 he = (HE *)hv_common(
1541 PL_stashcache, namesv, name, namelen,
4e7ebec5 1542 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1543 );
808724c8 1544
78e4f28f
DM		 1545 if (he) {
1546 SV *sv = HeVAL(he);
1547 HV *hv;
1548 assert(SvIOK(sv));
1549 hv = INT2PTR(HV*, SvIVX(sv));
1550 assert(SvTYPE(hv) == SVt_PVHV);
1551 return hv;
1552 }
d283e876 1553 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1554
808724c8 1555 if (namesv) {
1556 if (SvOK(namesv)) { /* prevent double uninit warning */
1557 STRLEN len;
1558 name = SvPV_const(namesv, len);
1559 namelen = len;
1560 flags |= SvUTF8(namesv);
1561 } else {
1562 name = ""; namelen = 0;
1563 }
1564 }
0eadbdad
YO		 1565 stash = gv_stashpvn_internal(name, namelen, flags);
1566
4e7ebec5 1567 if (stash && namelen) {
1568 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1569 (void)hv_store(PL_stashcache, name,
4e7ebec5 1570 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1571 }
808724c8 1572
4e7ebec5 1573 return stash;
1574}
1575
808724c8 1576HV*
1577Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1578{
1579 PERL_ARGS_ASSERT_GV_STASHPVN;
1580 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1581}
1582
954c1994
GS		 1583/*
1584=for apidoc gv_stashsv
1585
fbe13c60
KW		 1586Returns a pointer to the stash for a specified package. See
1587C<L</gv_stashpvn>>.
954c1994 1588
fbe13c60
KW		 1589Note this interface is strongly preferred over C<gv_stashpvn> for performance
1590reasons.
808724c8 1591
954c1994
GS		 1592=cut
1593*/
1594
a0d0e21e 1595HV*
da51bb9b 1596Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1597{
7918f24d 1598 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1599 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW		 1600}
1601
1602
463ee0b2 1603GV *
fe9845cc 1604Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1605 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1606 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1607}
1608
1609GV *
fe9845cc 1610Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1611 STRLEN len;
77cb3b01
FC		 1612 const char * const nambeg =
1613 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1614 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1615 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1616}
1617
90aeefb4 1618PERL_STATIC_INLINE void
290a1700 1619S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1620{
1621 AV* av;
1622
1623 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1624
1625 av = GvAVn(gv);
1626 GvMULTI_on(gv);
1627 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1628 NULL, 0);
ad7cce9f
FR		 1629}
1630
90aeefb4
BF		 1631/* This function grabs name and tries to split a stash and glob
1632 * from its contents. TODO better description, comments
1633 *
1634 * If the function returns TRUE and 'name == name_end', then
1635 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1636 */
1637PERL_STATIC_INLINE bool
1638S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1639 STRLEN *len, const char *nambeg, STRLEN full_len,
1640 const U32 is_utf8, const I32 add)
1641{
8c573bee 1642 char *tmpfullbuf = NULL; /* only malloc one big chunk of memory when the smallbuff is not large enough */
90aeefb4
BF		 1643 const char *name_cursor;
1644 const char *const name_end = nambeg + full_len;
1645 const char *const name_em1 = name_end - 1;
8c573bee 1646 char smallbuf[64]; /* small buffer to avoid a malloc when possible */
90aeefb4
BF		 1647
1648 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1649
7a207065
KW		 1650 if ( full_len > 2
1651 && **name == '*'
1652 && isIDFIRST_lazy_if_safe(*name + 1, name_end, is_utf8))
1653 {
90aeefb4
BF		 1654 /* accidental stringify on a GV? */
1655 (*name)++;
1656 }
1657
1658 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1659 if (name_cursor < name_em1 &&
1660 ((*name_cursor == ':' && name_cursor[1] == ':')
1661 || *name_cursor == '\''))
1662 {
1663 if (!*stash)
1664 *stash = PL_defstash;
1665 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
657ed7c1 1666 goto notok;
90aeefb4
BF		 1667
1668 *len = name_cursor - *name;
1669 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1670 const char *key;
1671 GV**gvp;
1672 if (*name_cursor == ':') {
1673 key = *name;
1674 *len += 2;
1675 }
f8ac814f 1676 else { /* using ' for package separator */
8c573bee
N		 1677 /* use our pre-allocated buffer when possible to save a malloc */
1678 char *tmpbuf;
1679 if ( *len+2 <= sizeof smallbuf)
1680 tmpbuf = smallbuf;
1681 else {
1682 /* only malloc once if needed */
1683 if (tmpfullbuf == NULL) /* only malloc&free once, a little more than needed */
1684 Newx(tmpfullbuf, full_len+2, char);
1685 tmpbuf = tmpfullbuf;
1686 }
90aeefb4
BF		 1687 Copy(*name, tmpbuf, *len, char);
1688 tmpbuf[(*len)++] = ':';
1689 tmpbuf[(*len)++] = ':';
1690 key = tmpbuf;
1691 }
c161da64 1692 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4 1693 *gv = gvp ? *gvp : NULL;
f8ac814f 1694 if (!*gv || *gv == (const GV *)&PL_sv_undef) {
657ed7c1 1695 goto notok;
f8ac814f
N		 1696 }
1697 /* here we know that *gv && *gv != &PL_sv_undef */
1698 if (SvTYPE(*gv) != SVt_PVGV)
1699 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1700 else
1701 GvMULTI_on(*gv);
90aeefb4
BF		 1702
1703 if (!(*stash = GvHV(*gv))) {
1704 *stash = GvHV(*gv) = newHV();
1705 if (!HvNAME_get(*stash)) {
1706 if (GvSTASH(*gv) == PL_defstash && *len == 6
c8b388b0 1707 && strBEGINs(*name, "CORE"))
4c4f3c46 1708 hv_name_sets(*stash, "CORE", 0);
90aeefb4
BF		 1709 else
1710 hv_name_set(
1711 *stash, nambeg, name_cursor-nambeg, is_utf8
1712 );
1713 /* If the containing stash has multiple effective
1714 names, see that this one gets them, too. */
1715 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1716 mro_package_moved(*stash, NULL, *gv, 1);
1717 }
1718 }
1719 else if (!HvNAME_get(*stash))
1720 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1721 }
1722
1723 if (*name_cursor == ':')
1724 name_cursor++;
1725 *name = name_cursor+1;
1726 if (*name == name_end) {
120921ac
Z		 1727 if (!*gv) {
1728 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1729 if (SvTYPE(*gv) != SVt_PVGV) {
1730 gv_init_pvn(*gv, PL_defstash, "main::", 6,
1731 GV_ADDMULTI);
1732 GvHV(*gv) =
1733 MUTABLE_HV(SvREFCNT_inc_simple(PL_defstash));
1734 }
1735 }
657ed7c1 1736 goto ok;
90aeefb4
BF		 1737 }
1738 }
1739 }
1740 *len = name_cursor - *name;
657ed7c1
DM		 1741 ok:
1742 Safefree(tmpfullbuf); /* free our tmpfullbuf if it was used */
90aeefb4 1743 return TRUE;
657ed7c1
DM		 1744 notok:
1745 Safefree(tmpfullbuf); /* free our tmpfullbuf if it was used */
1746 return FALSE;
90aeefb4
BF		 1747}
1748
657ed7c1 1749
536d1a88 1750/* Checks if an unqualified name is in the main stash */
90aeefb4 1751PERL_STATIC_INLINE bool
536d1a88 1752S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1753{
536d1a88 1754 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1755
90aeefb4 1756 /* If it's an alphanumeric variable */
7a207065 1757 if ( len && isIDFIRST_lazy_if_safe(name, name + len, is_utf8) ) {
90aeefb4
BF		 1758 /* Some "normal" variables are always in main::,
1759 * like INC or STDOUT.
1760 */
1761 switch (len) {
1762 case 1:
1763 if (*name == '_')
536d1a88 1764 return TRUE;
90aeefb4
BF		 1765 break;
1766 case 3:
1767 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1768 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1769 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1770 return TRUE;
90aeefb4
BF		 1771 break;
1772 case 4:
1773 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1774 && name[3] == 'V')
536d1a88 1775 return TRUE;
90aeefb4
BF		 1776 break;
1777 case 5:
1778 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1779 && name[3] == 'I' && name[4] == 'N')
536d1a88 1780 return TRUE;
90aeefb4
BF		 1781 break;
1782 case 6:
1783 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1784 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1785 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1786 return TRUE;
90aeefb4
BF		 1787 break;
1788 case 7:
1789 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1790 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1791 && name[6] == 'T')
536d1a88 1792 return TRUE;
90aeefb4
BF		 1793 break;
1794 }
536d1a88
BF		 1795 }
1796 /* *{""}, or a special variable like $@ */
1797 else
1798 return TRUE;
1799
1800 return FALSE;
1801}
1802
1803
1804/* This function is called if parse_gv_stash_name() failed to
1805 * find a stash, or if GV_NOTQUAL or an empty name was passed
1806 * to gv_fetchpvn_flags.
1807 *
1808 * It returns FALSE if the default stash can't be found nor created,
1809 * which might happen during global destruction.
1810 */
1811PERL_STATIC_INLINE bool
1812S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1813 const U32 is_utf8, const I32 add,
1814 const svtype sv_type)
1815{
1816 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1817
1818 /* No stash in name, so see how we can default */
90aeefb4 1819
536d1a88
BF		 1820 if ( gv_is_in_main(name, len, is_utf8) ) {
1821 *stash = PL_defstash;
1822 }
1823 else {
1824 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1825 *stash = PL_curstash;
1826 if (add && (PL_hints & HINT_STRICT_VARS) &&
1827 sv_type != SVt_PVCV &&
1828 sv_type != SVt_PVGV &&
1829 sv_type != SVt_PVFM &&
1830 sv_type != SVt_PVIO &&
1831 !(len == 1 && sv_type == SVt_PV &&
1832 (*name == 'a' || *name == 'b')) )
1833 {
c161da64 1834 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1835 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1836 SvTYPE(*gvp) != SVt_PVGV)
1837 {
1838 *stash = NULL;
1839 }
1840 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1841 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1842 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1843 {
1844 /* diag_listed_as: Variable "%s" is not imported%s */
1845 Perl_ck_warner_d(
1846 aTHX_ packWARN(WARN_MISC),
147e3846 1847 "Variable \"%c%" UTF8f "\" is not imported",
90aeefb4
BF		 1848 sv_type == SVt_PVAV ? '@' :
1849 sv_type == SVt_PVHV ? '%' : '$',
1850 UTF8fARG(is_utf8, len, name));
1851 if (GvCVu(*gvp))
1852 Perl_ck_warner_d(
1853 aTHX_ packWARN(WARN_MISC),
147e3846 1854 "\t(Did you mean &%" UTF8f " instead?)\n",
90aeefb4
BF		 1855 UTF8fARG(is_utf8, len, name)
1856 );
1857 *stash = NULL;
1858 }
1859 }
1860 }
1861 else {
1862 /* Use the current op's stash */
1863 *stash = CopSTASH(PL_curcop);
1864 }
1865 }
90aeefb4
BF		 1866
1867 if (!*stash) {
1868 if (add && !PL_in_clean_all) {
10860bf4
FC		 1869 GV *gv;
1870 qerror(Perl_mess(aTHX_
147e3846 1871 "Global symbol \"%s%" UTF8f
d8c6310a 1872 "\" requires explicit package name (did you forget to "
147e3846 1873 "declare \"my %s%" UTF8f "\"?)",
d8c6310a
FC		 1874 (sv_type == SVt_PV ? "$"
1875 : sv_type == SVt_PVAV ? "@"
1876 : sv_type == SVt_PVHV ? "%"
1877 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF		 1878 (sv_type == SVt_PV ? "$"
1879 : sv_type == SVt_PVAV ? "@"
1880 : sv_type == SVt_PVHV ? "%"
10860bf4 1881 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF		 1882 /* To maintain the output of errors after the strict exception
1883 * above, and to keep compat with older releases, rather than
1884 * placing the variables in the pad, we place
1885 * them in the <none>:: stash.
1886 */
90aeefb4
BF		 1887 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1888 if (!gv) {
1889 /* symbol table under destruction */
1890 return FALSE;
1891 }
1892 *stash = GvHV(gv);
1893 }
1894 else
1895 return FALSE;
1896 }
1897
1898 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1899 return FALSE;
1900
1901 return TRUE;
1902}
1903
8c995aba
FC		 1904/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1905 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1906 this file. */
1907#undef SvREADONLY_on
1908#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1909
930867a8
BF		 1910/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1911 * a new GV.
1912 * Note that it does not insert the GV into the stash prior to
1913 * magicalization, which some variables require need in order
c22e17d0 1914 * to work (like %+, %-, %!), so callers must take care of
1321bbe3 1915 * that.
930867a8 1916 *
1321bbe3
FC		 1917 * It returns true if the gv did turn out to be magical one; i.e.,
1918 * if gv_magicalize actually did something.
930867a8
BF		 1919 */
1920PERL_STATIC_INLINE bool
1921S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
1321bbe3 1922 const svtype sv_type)
79072805 1923{
960b831f 1924 SSize_t paren;
79072805 1925
930867a8 1926 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1927
44428a46 1928 if (stash != PL_defstash) { /* not the main stash */
ea238638 1929 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1930 and VERSION. All the others apply only to the main stash or to
1931 CORE (which is checked right after this). */
ea238638 1932 if (len) {
cc4c2da6 1933 switch (*name) {
cc4c2da6 1934 case 'E':
3092ee0c
YO		 1935 if (
1936 len >= 6 && name[1] == 'X' &&
1937 (memEQs(name, len, "EXPORT")
eafd371c
YO		 1938 ||memEQs(name, len, "EXPORT_OK")
1939 ||memEQs(name, len, "EXPORT_FAIL")
3092ee0c 1940 ||memEQs(name, len, "EXPORT_TAGS"))
eafd371c 1941 )
cc4c2da6
NC		 1942 GvMULTI_on(gv);
1943 break;
1944 case 'I':
eafd371c 1945 if (memEQs(name, len, "ISA"))
290a1700 1946 gv_magicalize_isa(gv);
cc4c2da6 1947 break;
44428a46 1948 case 'V':
eafd371c 1949 if (memEQs(name, len, "VERSION"))
44428a46
FC		 1950 GvMULTI_on(gv);
1951 break;
ea238638 1952 case 'a':
eafd371c 1953 if (stash == PL_debstash && memEQs(name, len, "args")) {
7bb33634
FC		 1954 GvMULTI_on(gv_AVadd(gv));
1955 break;
eafd371c
YO		 1956 }
1957 /* FALLTHROUGH */
ea238638
FC		 1958 case 'b':
1959 if (len == 1 && sv_type == SVt_PV)
1960 GvMULTI_on(gv);
924ba076 1961 /* FALLTHROUGH */
4aaa4757
FC		 1962 default:
1963 goto try_core;
1964 }
1321bbe3 1965 goto ret;
4aaa4757
FC		 1966 }
1967 try_core:
1968 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1969 /* Avoid null warning: */
1970 const char * const stashname = HvNAME(stash); assert(stashname);
c8b388b0 1971 if (strBEGINs(stashname, "CORE"))
87566176 1972 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1973 }
1974 }
1975 else if (len > 1) {
1976#ifndef EBCDIC
1977 if (*name > 'V' ) {
1978 NOOP;
1979 /* Nothing else to do.
1980 The compiler will probably turn the switch statement into a
1981 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1982 the common case of lower case variable names. (On EBCDIC
1983 platforms, we can't just do:
1984 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1985 because cases like '\027' in the switch statement below are
1986 C1 (non-ASCII) controls on those platforms, so the remapping
1987 would make them larger than 'V')
1988 */
44428a46
FC		 1989 } else
1990#endif
1991 {
44428a46
FC		 1992 switch (*name) {
1993 case 'A':
eafd371c 1994 if (memEQs(name, len, "ARGV")) {
44428a46
FC		 1995 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1996 }
eafd371c 1997 else if (memEQs(name, len, "ARGVOUT")) {
44428a46
FC		 1998 GvMULTI_on(gv);
1999 }
2000 break;
2001 case 'E':
3092ee0c
YO		 2002 if (
2003 len >= 6 && name[1] == 'X' &&
2004 (memEQs(name, len, "EXPORT")
055ae706
YO		 2005 ||memEQs(name, len, "EXPORT_OK")
2006 ||memEQs(name, len, "EXPORT_FAIL")
3092ee0c 2007 ||memEQs(name, len, "EXPORT_TAGS"))
055ae706 2008 )
44428a46
FC		 2009 GvMULTI_on(gv);
2010 break;
2011 case 'I':
eafd371c 2012 if (memEQs(name, len, "ISA")) {
290a1700 2013 gv_magicalize_isa(gv);
44428a46
FC		 2014 }
2015 break;
cc4c2da6 2016 case 'S':
eafd371c 2017 if (memEQs(name, len, "SIG")) {
cc4c2da6
NC		 2018 HV *hv;
2019 I32 i;
d525a7b2
NC		 2020 if (!PL_psig_name) {
2021 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 2022 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 2023 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 2024 } else {
2025 /* I think that the only way to get here is to re-use an
2026 embedded perl interpreter, where the previous
2027 use didn't clean up fully because
2028 PL_perl_destruct_level was 0. I'm not sure that we
2029 "support" that, in that I suspect in that scenario
2030 there are sufficient other garbage values left in the
2031 interpreter structure that something else will crash
2032 before we get here. I suspect that this is one of
2033 those "doctor, it hurts when I do this" bugs. */
d525a7b2 2034 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 2035 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 2036 }
2037 GvMULTI_on(gv);
2038 hv = GvHVn(gv);
a0714e2c 2039 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 2040 for (i = 1; i < SIG_SIZE; i++) {
551405c4 2041 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 2042 if (init)
2043 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 2044 }
2045 }
2046 break;
2047 case 'V':
eafd371c 2048 if (memEQs(name, len, "VERSION"))
cc4c2da6
NC		 2049 GvMULTI_on(gv);
2050 break;
e5218da5 2051 case '\003': /* $^CHILD_ERROR_NATIVE */
eafd371c 2052 if (memEQs(name, len, "\003HILD_ERROR_NATIVE"))
e5218da5 2053 goto magicalize;
27deb0cf
YO		 2054 /* @{^CAPTURE} %{^CAPTURE} */
2055 if (memEQs(name, len, "\003APTURE")) {
2056 AV* const av = GvAVn(gv);
fa531f32 2057 const Size_t n = *name;
27deb0cf 2058
fa531f32 2059 sv_magic(MUTABLE_SV(av), (SV*)n, PERL_MAGIC_regdata, NULL, 0);
27deb0cf
YO		 2060 SvREADONLY_on(av);
2061
d8422270 2062 require_tie_mod_s(gv, '+', "Tie::Hash::NamedCapture",0);
27deb0cf
YO		 2063
2064 } else /* %{^CAPTURE_ALL} */
2065 if (memEQs(name, len, "\003APTURE_ALL")) {
d8422270 2066 require_tie_mod_s(gv, '-', "Tie::Hash::NamedCapture",0);
27deb0cf 2067 }
e5218da5 2068 break;
cc4c2da6 2069 case '\005': /* $^ENCODING */
eafd371c 2070 if (memEQs(name, len, "\005NCODING"))
cc4c2da6
NC		 2071 goto magicalize;
2072 break;
9ebf26ad 2073 case '\007': /* $^GLOBAL_PHASE */
eafd371c 2074 if (memEQs(name, len, "\007LOBAL_PHASE"))
9ebf26ad
FR		 2075 goto ro_magicalize;
2076 break;
8561ea1d 2077 case '\014': /* $^LAST_FH */
eafd371c 2078 if (memEQs(name, len, "\014AST_FH"))
8561ea1d
FC		 2079 goto ro_magicalize;
2080 break;
cde0cee5 2081 case '\015': /* $^MATCH */
eafd371c 2082 if (memEQs(name, len, "\015ATCH")) {
960b831f
NC		 2083 paren = RX_BUFF_IDX_CARET_FULLMATCH;
2084 goto storeparen;
2085 }
66230c86 2086 break;
cc4c2da6 2087 case '\017': /* $^OPEN */
eafd371c 2088 if (memEQs(name, len, "\017PEN"))
cc4c2da6
NC		 2089 goto magicalize;
2090 break;
cde0cee5 2091 case '\020': /* $^PREMATCH $^POSTMATCH */
eafd371c 2092 if (memEQs(name, len, "\020REMATCH")) {
960b831f
NC		 2093 paren = RX_BUFF_IDX_CARET_PREMATCH;
2094 goto storeparen;
2095 }
eafd371c 2096 if (memEQs(name, len, "\020OSTMATCH")) {
960b831f
NC		 2097 paren = RX_BUFF_IDX_CARET_POSTMATCH;
2098 goto storeparen;
2099 }
9ebf26ad 2100 break;
f512d242
KW		 2101 case '\023':
2102 if (memEQs(name, len, "\023AFE_LOCALES"))
2103 goto ro_magicalize;
2104 break;
cc4c2da6 2105 case '\024': /* ${^TAINT} */
eafd371c 2106 if (memEQs(name, len, "\024AINT"))
cc4c2da6
NC		 2107 goto ro_magicalize;
2108 break;
7cebcbc0 2109 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
eafd371c 2110 if (memEQs(name, len, "\025NICODE"))
cc4c2da6 2111 goto ro_magicalize;
eafd371c 2112 if (memEQs(name, len, "\025TF8LOCALE"))
7cebcbc0 2113 goto ro_magicalize;
eafd371c 2114 if (memEQs(name, len, "\025TF8CACHE"))
e07ea26a 2115 goto magicalize;
cc4c2da6
NC		 2116 break;
2117 case '\027': /* $^WARNING_BITS */
eafd371c 2118 if (memEQs(name, len, "\027ARNING_BITS"))
cc4c2da6 2119 goto magicalize;
8ca2a5d6 2120#ifdef WIN32
eafd371c 2121 else if (memEQs(name, len, "\027IN32_SLOPPY_STAT"))
8ca2a5d6
DD		 2122 goto magicalize;
2123#endif
cc4c2da6
NC		 2124 break;
2125 case '1':
2126 case '2':
2127 case '3':
2128 case '4':
2129 case '5':
2130 case '6':
2131 case '7':
2132 case '8':
2133 case '9':
85e6fe83 2134 {
2fdbfb4d
AB		 2135 /* Ensures that we have an all-digit variable, ${"1foo"} fails
2136 this test */
22ff3130
HS		 2137 UV uv;
2138 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1321bbe3 2139 goto ret;
22ff3130
HS		 2140 /* XXX why are we using a SSize_t? */
2141 paren = (SSize_t)(I32)uv;
960b831f 2142 goto storeparen;
1d7c1841 2143 }
dc437b57 2144 }
93a17b20 2145 }
392db708
NC		 2146 } else {
2147 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2148 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2149 switch (*name) {
6361f656 2150 case '&': /* $& */
960b831f
NC		 2151 paren = RX_BUFF_IDX_FULLMATCH;
2152 goto sawampersand;
6361f656 2153 case '`': /* $` */
960b831f
NC		 2154 paren = RX_BUFF_IDX_PREMATCH;
2155 goto sawampersand;
6361f656 2156 case '\'': /* $' */
960b831f
NC		 2157 paren = RX_BUFF_IDX_POSTMATCH;
2158 sawampersand:
1a904fc8 2159#ifdef PERL_SAWAMPERSAND
a289ef89 2160 if (!(
cc4c2da6
NC		 2161 sv_type == SVt_PVAV ||
2162 sv_type == SVt_PVHV ||
2163 sv_type == SVt_PVCV ||
2164 sv_type == SVt_PVFM ||
2165 sv_type == SVt_PVIO
d3b97530
DM		 2166 )) { PL_sawampersand |=
2167 (*name == '`')
2168 ? SAWAMPERSAND_LEFT
2169 : (*name == '&')
2170 ? SAWAMPERSAND_MIDDLE
2171 : SAWAMPERSAND_RIGHT;
2172 }
1a904fc8 2173#endif
960b831f 2174 goto storeparen;
e91d8259
NC		 2175 case '1': /* $1 */
2176 case '2': /* $2 */
2177 case '3': /* $3 */
2178 case '4': /* $4 */
2179 case '5': /* $5 */
2180 case '6': /* $6 */
2181 case '7': /* $7 */
2182 case '8': /* $8 */
2183 case '9': /* $9 */
960b831f
NC		 2184 paren = *name - '0';
2185
2186 storeparen:
e91d8259
NC		 2187 /* Flag the capture variables with a NULL mg_ptr
2188 Use mg_len for the array index to lookup. */
960b831f 2189 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2190 break;
cc4c2da6 2191
6361f656 2192 case ':': /* $: */
c69033f2 2193 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 2194 goto magicalize;
2195
6361f656 2196 case '?': /* $? */
ff0cee69 2197#ifdef COMPLEX_STATUS
c69033f2 2198 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2199#endif
cc4c2da6 2200 goto magicalize;
ff0cee69 2201
6361f656 2202 case '!': /* $! */
67261566 2203 GvMULTI_on(gv);
44a2ac75 2204 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2205
ad64d0ec 2206 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2207
7c719134 2208 /* magicalization must be done before require_tie_mod_s is called */
67261566 2209 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
7c719134 2210 require_tie_mod_s(gv, '!', "Errno", 1);
d2c93421 2211
6cef1e77 2212 break;
754f85ad
YO		 2213 case '-': /* $-, %-, @- */
2214 case '+': /* $+, %+, @+ */
27deb0cf
YO		 2215 GvMULTI_on(gv); /* no used once warnings here */
2216 { /* $- $+ */
2217 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
2218 if (*name == '+')
2219 SvREADONLY_on(GvSVn(gv));
2220 }
2221 { /* %- %+ */
2222 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
2223 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture",0);
2224 }
2225 { /* @- @+ */
2226 AV* const av = GvAVn(gv);
fa531f32 2227 const Size_t n = *name;
67261566 2228
fa531f32 2229 sv_magic(MUTABLE_SV(av), (SV*)n, PERL_MAGIC_regdata, NULL, 0);
27deb0cf
YO		 2230 SvREADONLY_on(av);
2231 }
80305961 2232 break;
a678626e
A		 2233 case '*': /* $* */
2234 case '#': /* $# */
dcb414ac
JK		 2235 if (sv_type == SVt_PV)
2236 /* diag_listed_as: $* is no longer supported as of Perl 5.30 */
2237 Perl_croak(aTHX_ "$%c is no longer supported as of Perl 5.30", *name);
2238 break;
b3ca2e83
NC		 2239 case '\010': /* $^H */
2240 {
2241 HV *const hv = GvHVn(gv);
2242 hv_magic(hv, NULL, PERL_MAGIC_hints);
2243 }
2244 goto magicalize;
cc4c2da6 2245 case '\023': /* $^S */
2fdbfb4d
AB		 2246 ro_magicalize:
2247 SvREADONLY_on(GvSVn(gv));
924ba076 2248 /* FALLTHROUGH */
6361f656 2249 case '0': /* $0 */
6361f656
AB		 2250 case '^': /* $^ */
2251 case '~': /* $~ */
2252 case '=': /* $= */
2253 case '%': /* $% */
2254 case '.': /* $. */
2255 case '(': /* $( */
2256 case ')': /* $) */
2257 case '<': /* $< */
2258 case '>': /* $> */
2259 case '\\': /* $\ */
2260 case '/': /* $/ */
4505a31f 2261 case '|': /* $| */
9cdac2a2 2262 case '$': /* $$ */
c22e17d0 2263 case '[': /* $[ */
cc4c2da6
NC		 2264 case '\001': /* $^A */
2265 case '\003': /* $^C */
2266 case '\004': /* $^D */
2267 case '\005': /* $^E */
2268 case '\006': /* $^F */
cc4c2da6
NC		 2269 case '\011': /* $^I, NOT \t in EBCDIC */
2270 case '\016': /* $^N */
2271 case '\017': /* $^O */
2272 case '\020': /* $^P */
2273 case '\024': /* $^T */
2274 case '\027': /* $^W */
2275 magicalize:
ad64d0ec 2276 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2277 break;
e521374c 2278
cc4c2da6 2279 case '\014': /* $^L */
76f68e9b 2280 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2281 break;
6361f656 2282 case ';': /* $; */
76f68e9b 2283 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2284 break;
6361f656 2285 case ']': /* $] */
cc4c2da6 2286 {
3638bf15 2287 SV * const sv = GvSV(gv);
d7aa5382 2288 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2289 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2290 GvSV(gv) = vnumify(PL_patchlevel);
2291 SvREADONLY_on(GvSV(gv));
2292 SvREFCNT_dec(sv);
93a17b20
LW		 2293 }
2294 break;
cc4c2da6
NC		 2295 case '\026': /* $^V */
2296 {
3638bf15 2297 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2298 GvSV(gv) = new_version(PL_patchlevel);
2299 SvREADONLY_on(GvSV(gv));
2300 SvREFCNT_dec(sv);
16070b82
GS		 2301 }
2302 break;
ea238638
FC		 2303 case 'a':
2304 case 'b':
dc3e91f6 2305 if (sv_type == SVt_PV)
ea238638 2306 GvMULTI_on(gv);
cc4c2da6 2307 }
79072805 2308 }
930867a8 2309
1321bbe3
FC		 2310 ret:
2311 /* Return true if we actually did something. */
2312 return GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv)
2313 || ( GvSV(gv) && (
2314 SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv))
2315 )
2316 );
71c35c05
BF		 2317}
2318
8c995aba
FC		 2319/* If we do ever start using this later on in the file, we need to make
2320 sure we don’t accidentally use the wrong definition. */
2321#undef SvREADONLY_on
2322
070dc475
BF		 2323/* This function is called when the stash already holds the GV of the magic
2324 * variable we're looking for, but we need to check that it has the correct
2325 * kind of magic. For example, if someone first uses $! and then %!, the
2326 * latter would end up here, and we add the Errno tie to the HASH slot of
2327 * the *! glob.
2328 */
2329PERL_STATIC_INLINE void
2330S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2331{
2332 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2333
2334 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2335 if (*name == '!')
7c719134 2336 require_tie_mod_s(gv, '!', "Errno", 1);
070dc475 2337 else if (*name == '-' || *name == '+')
7c719134 2338 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture", 0);
a678626e
A		 2339 } else if (sv_type == SVt_PV) {
2340 if (*name == '*' || *name == '#') {
dcb414ac
JK		 2341 /* diag_listed_as: $* is no longer supported as of Perl 5.30 */
2342 Perl_croak(aTHX_ "$%c is no longer supported as of Perl 5.30", *name);
a678626e 2343 }
070dc475
BF		 2344 }
2345 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2346 switch (*name) {
070dc475
BF		 2347#ifdef PERL_SAWAMPERSAND
2348 case '`':
2349 PL_sawampersand |= SAWAMPERSAND_LEFT;
2350 (void)GvSVn(gv);
2351 break;
2352 case '&':
2353 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2354 (void)GvSVn(gv);
2355 break;
2356 case '\'':
2357 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2358 (void)GvSVn(gv);
2359 break;
2360#endif
2361 }
2362 }
2363}
2364
71c35c05
BF		 2365GV *
2366Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2367 const svtype sv_type)
2368{
71c35c05
BF		 2369 const char *name = nambeg;
2370 GV *gv = NULL;
2371 GV**gvp;
2372 STRLEN len;
2373 HV *stash = NULL;
2374 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2375 const I32 no_expand = flags & GV_NOEXPAND;
2376 const I32 add = flags & ~GV_NOADD_MASK;
2377 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2378 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2379 const char *const name_end = nambeg + full_len;
2380 U32 faking_it;
2381
2382 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2383
2384 /* If we have GV_NOTQUAL, the caller promised that
2385 * there is no stash, so we can skip the check.
2386 * Similarly if full_len is 0, since then we're
2387 * dealing with something like *{""} or ""->foo()
2388 */
2389 if ((flags & GV_NOTQUAL) || !full_len) {
2390 len = full_len;
2391 }
2392 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2393 if (name == name_end) return gv;
2394 }
2395 else {
2396 return NULL;
2397 }
2398
2399 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2400 return NULL;
2401 }
2402
2403 /* By this point we should have a stash and a name */
c161da64 2404 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2405 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2406 if (addmg) gv = (GV *)newSV(0);
2407 else return NULL;
2408 }
2409 else gv = *gvp, addmg = 0;
2410 /* From this point on, addmg means gv has not been inserted in the
2411 symtab yet. */
2412
2413 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2414 /* The GV already exists, so return it, but check if we need to do
2415 * anything else with it before that.
2416 */
71c35c05 2417 if (add) {
c002ae9a
BF		 2418 /* This is the heuristic that handles if a variable triggers the
2419 * 'used only once' warning. If there's already a GV in the stash
2420 * with this name, then we assume that the variable has been used
2421 * before and turn its MULTI flag on.
2422 * It's a heuristic because it can easily be "tricked", like with
2423 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2424 * not warning about $main::foo being used just once
2425 */
71c35c05
BF		 2426 GvMULTI_on(gv);
2427 gv_init_svtype(gv, sv_type);
2428 /* You reach this path once the typeglob has already been created,
2429 either by the same or a different sigil. If this path didn't
2430 exist, then (say) referencing $! first, and %! second would
2431 mean that %! was not handled correctly. */
2432 if (len == 1 && stash == PL_defstash) {
070dc475 2433 maybe_multimagic_gv(gv, name, sv_type);
71c35c05 2434 }
b59bf0b2
KW		 2435 else if (sv_type == SVt_PVAV
2436 && memEQs(name, len, "ISA")
71c35c05
BF		 2437 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2438 gv_magicalize_isa(gv);
2439 }
2440 return gv;
2441 } else if (no_init) {
2442 assert(!addmg);
2443 return gv;
c002ae9a
BF		 2444 }
2445 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2446 * don't expand it to a glob. This is an optimization so that things
2447 * copying constants over, like Exporter, don't have to be rewritten
2448 * to take into account that you can store more than just globs in
2449 * stashes.
2450 */
2451 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2452 assert(!addmg);
2453 return gv;
2454 }
2455
2456 /* Adding a new symbol.
2457 Unless of course there was already something non-GV here, in which case
2458 we want to behave as if there was always a GV here, containing some sort
2459 of subroutine.
2460 Otherwise we run the risk of creating things like GvIO, which can cause
2461 subtle bugs. eg the one that tripped up SQL::Translator */
2462
2463 faking_it = SvOK(gv);
2464
2465 if (add & GV_ADDWARN)
2466 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
147e3846 2467 "Had to create %" UTF8f " unexpectedly",
71c35c05
BF		 2468 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2469 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2470
7a207065
KW		 2471 if ( full_len != 0
2472 && isIDFIRST_lazy_if_safe(name, name + full_len, is_utf8)
2473 && !ckWARN(WARN_ONCE) )
2474 {
71c35c05 2475 GvMULTI_on(gv) ;
7a207065 2476 }
71c35c05
BF		 2477
2478 /* set up magic where warranted */
1321bbe3 2479 if ( gv_magicalize(gv, stash, name, len, sv_type) ) {
930867a8 2480 /* See 23496c6 */
1321bbe3
FC		 2481 if (addmg) {
2482 /* gv_magicalize magicalised this gv, so we want it
930867a8 2483 * stored in the symtab.
1321bbe3
FC		 2484 * Effectively the caller is asking, ‘Does this gv exist?’
2485 * And we respond, ‘Er, *now* it does!’
930867a8
BF		 2486 */
2487 (void)hv_store(stash,name,len,(SV *)gv,0);
1321bbe3
FC		 2488 }
2489 }
2490 else if (addmg) {
2491 /* The temporary GV created above */
930867a8
BF		 2492 SvREFCNT_dec_NN(gv);
2493 gv = NULL;
930867a8 2494 }
71c35c05 2495
e6066781 2496 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2497 return gv;
79072805
LW		 2498}
2499
2500void
35a4481c 2501Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2502{
ed60a868 2503 const char *name;
35a4481c 2504 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2505
2506 PERL_ARGS_ASSERT_GV_FULLNAME4;
2507
666ea192 2508 sv_setpv(sv, prefix ? prefix : "");
a0288114 2509
52a6327b 2510 if (hv && (name = HvNAME(hv))) {
ed60a868 2511 const STRLEN len = HvNAMELEN(hv);
61e2287f 2512 if (keepmain || ! memBEGINs(name, len, "main")) {
ed60a868 2513 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2514 sv_catpvs(sv,"::");
ed60a868 2515 }
43693395 2516 }
ed60a868 2517 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2518 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2519}
2520
2521void
35a4481c 2522Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2523{
099be4f1 2524 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2525
2526 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2527
46c461b5 2528 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2529}
2530
39a65960
DM		 2531
2532/* recursively scan a stash and any nested stashes looking for entries
2533 * that need the "only used once" warning raised
2534 */
2535
79072805 2536void
51da40ed 2537Perl_gv_check(pTHX_ HV *stash)
79072805 2538{
eb578fdb 2539 I32 i;
463ee0b2 2540
7918f24d
NC		 2541 PERL_ARGS_ASSERT_GV_CHECK;
2542
9e5cda6b 2543 if (!SvOOK(stash))
8990e307 2544 return;
90754377 2545
9e5cda6b 2546 assert(HvARRAY(stash));
90754377 2547
a0d0e21e 2548 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2549 const HE *entry;
90754377 2550 /* mark stash is being scanned, to avoid recursing */
339441ef 2551 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2552 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2553 GV *gv;
b7787f18 2554 HV *hv;
e7acdfe9
DM		 2555 STRLEN keylen = HeKLEN(entry);
2556 const char * const key = HeKEY(entry);
2557
2558 if (keylen >= 2 && key[keylen-2] == ':' && key[keylen-1] == ':' &&
159b6efe 2559 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2560 {
90754377
DM		 2561 if (hv != PL_defstash && hv != stash
2562 && !(SvOOK(hv)
2563 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2564 )
a0d0e21e
LW		 2565 gv_check(hv); /* nested package */
2566 }
7a207065
KW		 2567 else if ( HeKLEN(entry) != 0
2568 && *HeKEY(entry) != '_'
2569 && isIDFIRST_lazy_if_safe(HeKEY(entry),
2570 HeKEY(entry) + HeKLEN(entry),
2571 HeUTF8(entry)) )
2572 {
e1ec3a88 2573 const char *file;
159b6efe 2574 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2575 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2576 continue;
1d7c1841 2577 file = GvFILE(gv);
1d7c1841 2578 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2579#ifdef USE_ITHREADS
2580 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2581#else
2582 CopFILEGV(PL_curcop)
2583 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2584#endif
9014280d 2585 Perl_warner(aTHX_ packWARN(WARN_ONCE),
147e3846 2586 "Name \"%" HEKf "::%" HEKf
d0c0e7dd
FC		 2587 "\" used only once: possible typo",
2588 HEKfARG(HvNAME_HEK(stash)),
2589 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2590 }
79072805 2591 }
339441ef 2592 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2593 }
2594}
2595
2596GV *
9cc50d5b 2597Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2598{
9cc50d5b 2599 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2600 assert(!(flags & ~SVf_UTF8));
7918f24d 2601
147e3846 2602 return gv_fetchpv(Perl_form(aTHX_ "%" UTF8f "::_GEN_%ld",
b17a0679 2603 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2604 (long)PL_gensym++),
2605 GV_ADD, SVt_PVGV);
79072805
LW		 2606}
2607
2608/* hopefully this is only called on local symbol table entries */
2609
2610GP*
864dbfa3 2611Perl_gp_ref(pTHX_ GP *gp)
79072805 2612{
1d7c1841 2613 if (!gp)
d4c19fe8 2614 return NULL;
79072805 2615 gp->gp_refcnt++;
44a8e56a 2616 if (gp->gp_cv) {
2617 if (gp->gp_cvgen) {
e1a479c5
BB		 2618 /* If the GP they asked for a reference to contains
2619 a method cache entry, clear it first, so that we
2620 don't infect them with our cached entry */
e7881358 2621 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2622 gp->gp_cv = NULL;
44a8e56a 2623 gp->gp_cvgen = 0;
2624 }
44a8e56a 2625 }
79072805 2626 return gp;
79072805
LW		 2627}
2628
2629void
864dbfa3 2630Perl_gp_free(pTHX_ GV *gv)
79072805 2631{
79072805 2632 GP* gp;
b0d55c99 2633 int attempts = 100;
79072805 2634
f7877b28 2635 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2636 return;
f248d071 2637 if (gp->gp_refcnt == 0) {
9b387841
NC		 2638 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2639 "Attempt to free unreferenced glob pointers"
2640 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2641 return;
2642 }
4571f4a7 2643 if (gp->gp_refcnt > 1) {
bc81b34d 2644 borrowed:
748a9306
LW		 2645 if (gp->gp_egv == gv)
2646 gp->gp_egv = 0;
4571f4a7 2647 gp->gp_refcnt--;
c43ae56f 2648 GvGP_set(gv, NULL);
79072805 2649 return;
748a9306 2650 }
79072805 2651
b0d55c99
FC		 2652 while (1) {
2653 /* Copy and null out all the glob slots, so destructors do not see
2654 freed SVs. */
2655 HEK * const file_hek = gp->gp_file_hek;
2656 SV * const sv = gp->gp_sv;
2657 AV * const av = gp->gp_av;
2658 HV * const hv = gp->gp_hv;
2659 IO * const io = gp->gp_io;
2660 CV * const cv = gp->gp_cv;
2661 CV * const form = gp->gp_form;
2662
2663 gp->gp_file_hek = NULL;
2664 gp->gp_sv = NULL;
2665 gp->gp_av = NULL;
2666 gp->gp_hv = NULL;
2667 gp->gp_io = NULL;
2668 gp->gp_cv = NULL;
2669 gp->gp_form = NULL;
2670
2671 if (file_hek)
2672 unshare_hek(file_hek);
2673
2674 SvREFCNT_dec(sv);
2675 SvREFCNT_dec(av);
2676 /* FIXME - another reference loop GV -> symtab -> GV ?
2677 Somehow gp->gp_hv can end up pointing at freed garbage. */
2678 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2679 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC		 2680 if (PL_stashcache && hvname_hek) {
2681 DEBUG_o(Perl_deb(aTHX_
147e3846 2682 "gp_free clearing PL_stashcache for '%" HEKf "'\n",
923ed580 2683 HEKfARG(hvname_hek)));
0ca9877d 2684 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2685 }
b0d55c99
FC		 2686 SvREFCNT_dec(hv);
2687 }
96d7c888
FC		 2688 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2689 && (IoTYPE(io) == IoTYPE_WRONLY ||
2690 IoTYPE(io) == IoTYPE_RDWR ||
2691 IoTYPE(io) == IoTYPE_APPEND)
2692 && ckWARN_d(WARN_IO)
2693 && IoIFP(io) != PerlIO_stdin()
2694 && IoIFP(io) != PerlIO_stdout()
2695 && IoIFP(io) != PerlIO_stderr()
2696 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2697 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC		 2698 SvREFCNT_dec(io);
2699 SvREFCNT_dec(cv);
2700 SvREFCNT_dec(form);
2701
bc81b34d
FC		 2702 /* Possibly reallocated by a destructor */
2703 gp = GvGP(gv);
2704
b0d55c99
FC		 2705 if (!gp->gp_file_hek
2706 && !gp->gp_sv
2707 && !gp->gp_av
2708 && !gp->gp_hv
2709 && !gp->gp_io
2710 && !gp->gp_cv
2711 && !gp->gp_form) break;
2712
2713 if (--attempts == 0) {
2714 Perl_die(aTHX_
2715 "panic: gp_free failed to free glob pointer - "
2716 "something is repeatedly re-creating entries"
2717 );
2718 }
13207a71 2719 }
748a9306 2720
bc81b34d
FC		 2721 /* Possibly incremented by a destructor doing glob assignment */
2722 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2723 Safefree(gp);
c43ae56f 2724 GvGP_set(gv, NULL);
79072805
LW		 2725}
2726
d460ef45
NIS		 2727int
2728Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2729{
53c1dcc0
AL		 2730 AMT * const amtp = (AMT*)mg->mg_ptr;
2731 PERL_UNUSED_ARG(sv);
dd374669 2732
7918f24d
NC		 2733 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2734
d460ef45
NIS		 2735 if (amtp && AMT_AMAGIC(amtp)) {
2736 int i;
2737 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2738 CV * const cv = amtp->table[i];
b37c2d43 2739 if (cv) {
e7881358 2740 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2741 amtp->table[i] = NULL;
d460ef45
NIS		 2742 }
2743 }
2744 }
2745 return 0;
2746}
2747
a0d0e21e 2748/* Updates and caches the CV's */
c3a9a790
RGS		 2749/* Returns:
2750 * 1 on success and there is some overload
2751 * 0 if there is no overload
2752 * -1 if some error occurred and it couldn't croak
2753 */
a0d0e21e 2754
c3a9a790 2755int
242f8760 2756Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2757{
ad64d0ec 2758 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2759 AMT amt;
9b439311 2760 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2761 U32 newgen;
a0d0e21e 2762
7918f24d
NC		 2763 PERL_ARGS_ASSERT_GV_AMUPDATE;
2764
9b439311 2765 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2766 if (mg) {
2767 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2768 if (amtp->was_ok_sub == newgen) {
8c34e50d 2769 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2770 }
ad64d0ec 2771 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2772 }
a0d0e21e 2773
bfcb3514 2774 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2775
d460ef45 2776 Zero(&amt,1,AMT);
e1a479c5 2777 amt.was_ok_sub = newgen;
a6006777 2778 amt.fallback = AMGfallNO;
2779 amt.flags = 0;
2780
a6006777 2781 {
8c34e50d
FC		 2782 int filled = 0;
2783 int i;
3d147ac2
DM		 2784 bool deref_seen = 0;
2785
a6006777 2786
3866ea3b 2787 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2788
89ffc314 2789 /* Try to find via inheritance. */
e6919483 2790 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2791 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2792 CV* cv;
89ffc314
IZ		 2793
2794 if (!gv)
3866ea3b
FC		 2795 {
2796 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2797 goto no_table;
3866ea3b
FC		 2798 }
2799#ifdef PERL_DONT_CREATE_GVSV
2800 else if (!sv) {
6f207bd3 2801 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2802 }
2803#endif
79c9643d
JL		 2804 else if (SvTRUE(sv))
2805 /* don't need to set overloading here because fallback => 1
2806 * is the default setting for classes without overloading */
89ffc314 2807 amt.fallback=AMGfallYES;
79c9643d
JL		 2808 else if (SvOK(sv)) {
2809 amt.fallback=AMGfallNEVER;
386a5489 2810 filled = 1;
386a5489 2811 }
79c9643d 2812 else {
386a5489 2813 filled = 1;
386a5489 2814 }
a6006777 2815
3d147ac2 2816 assert(SvOOK(stash));
3d147ac2 2817 /* initially assume the worst */
339441ef 2818 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2819
8c34e50d 2820 for (i = 1; i < NofAMmeth; i++) {
6136c704 2821 const char * const cooky = PL_AMG_names[i];
32251b26 2822 /* Human-readable form, for debugging: */
8c34e50d 2823 const char * const cp = AMG_id2name(i);
d279ab82 2824 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2825
a0288114 2826 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2827 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2828 /* don't fill the cache while looking up!
2829 Creation of inheritance stubs in intermediate packages may
2830 conflict with the logic of runtime method substitution.
2831 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2832 then we could have created stubs for "(+0" in A and C too.
2833 But if B overloads "bool", we may want to use it for
2834 numifying instead of C's "+0". */
8c34e50d 2835 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2836 cv = 0;
c3ad4e54 2837 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
79656330 2838 const HEK * const gvhek = CvGvNAME_HEK(cv);
c3ad4e54
FC		 2839 const HEK * const stashek =
2840 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
b59bf0b2
KW		 2841 if (memEQs(HEK_KEY(gvhek), HEK_LEN(gvhek), "nil")
2842 && stashek
2843 && memEQs(HEK_KEY(stashek), HEK_LEN(stashek), "overload")) {
611c1e95
IZ		 2844 /* This is a hack to support autoloading..., while
2845 knowing *which* methods were declared as overloaded. */
44a8e56a 2846 /* GvSV contains the name of the method. */
6136c704 2847 GV *ngv = NULL;
c69033f2 2848 SV *gvsv = GvSV(gv);
a0288114 2849
147e3846 2850 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%" SVf256\
a0288114 2851 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2852 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2853 if (!gvsv || !SvPOK(gvsv)
7f415459 2854 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2855 {
a0288114 2856 /* Can be an import stub (created by "can"). */
242f8760 2857 if (destructing) {
c3a9a790 2858 return -1;
242f8760
RGS		 2859 }
2860 else {
d66cca07
BF		 2861 const SV * const name = (gvsv && SvPOK(gvsv))
2862 ? gvsv
2863 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2864 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
147e3846 2865 Perl_croak(aTHX_ "%s method \"%" SVf256
d66cca07 2866 "\" overloading \"%s\" "\
147e3846 2867 "in package \"%" HEKf256 "\"",
242f8760
RGS		 2868 (GvCVGEN(gv) ? "Stub found while resolving"
2869 : "Can't resolve"),
d66cca07 2870 SVfARG(name), cp,
d0c0e7dd 2871 HEKfARG(
d66cca07 2872 HvNAME_HEK(stash)
d0c0e7dd 2873 ));
242f8760 2874 }
44a8e56a 2875 }
dc848c6f 2876 cv = GvCV(gv = ngv);
44a8e56a 2877 }
b464bac0 2878 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2879 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2880 GvNAME(CvGV(cv))) );
2881 filled = 1;
611c1e95 2882 } else if (gv) { /* Autoloaded... */
ea726b52 2883 cv = MUTABLE_CV(gv);
611c1e95 2884 filled = 1;
44a8e56a 2885 }
ea726b52 2886 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2887
2888 if (gv) {
2889 switch (i) {
2890 case to_sv_amg:
2891 case to_av_amg:
2892 case to_hv_amg:
2893 case to_gv_amg:
2894 case to_cv_amg:
2895 case nomethod_amg:
2896 deref_seen = 1;
2897 break;
2898 }
2899 }
a0d0e21e 2900 }
3d147ac2 2901 if (!deref_seen)
45479970
DM		 2902 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2903 * NB - aux var invalid here, HvARRAY() could have been
2904 * reallocated since it was assigned to */
2905 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2906
a0d0e21e 2907 if (filled) {
a6006777 2908 AMT_AMAGIC_on(&amt);
ad64d0ec 2909 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2910 (char*)&amt, sizeof(AMT));
8c34e50d 2911 return TRUE;
a0d0e21e
LW		 2912 }
2913 }
a6006777 2914 /* Here we have no table: */
8c34e50d 2915 no_table:
a6006777 2916 AMT_AMAGIC_off(&amt);
ad64d0ec 2917 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2918 (char*)&amt, sizeof(AMTS));
c3a9a790 2919 return 0;
a0d0e21e
LW		 2920}
2921
32251b26
IZ		 2922
2923CV*
2924Perl_gv_handler(pTHX_ HV *stash, I32 id)
2925{
3f8f4626 2926 MAGIC *mg;
32251b26 2927 AMT *amtp;
e1a479c5 2928 U32 newgen;
9b439311 2929 struct mro_meta* stash_meta;
32251b26 2930
bfcb3514 2931 if (!stash || !HvNAME_get(stash))
601f1833 2932 return NULL;
e1a479c5 2933
9b439311
BB		 2934 stash_meta = HvMROMETA(stash);
2935 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2936
ad64d0ec 2937 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2938 if (!mg) {
2939 do_update:
8c34e50d 2940 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2941 return NULL;
ad64d0ec 2942 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2943 }
a9fd4e40 2944 assert(mg);
32251b26 2945 amtp = (AMT*)mg->mg_ptr;
66978156 2946 if ( amtp->was_ok_sub != newgen )
32251b26 2947 goto do_update;
3ad83ce7 2948 if (AMT_AMAGIC(amtp)) {
b7787f18 2949 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2950 if (ret && isGV(ret)) { /* Autoloading stab */
2951 /* Passing it through may have resulted in a warning
2952 "Inherited AUTOLOAD for a non-method deprecated", since
2953 our caller is going through a function call, not a method call.
2954 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2955 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2956
2957 if (gv && GvCV(gv))
2958 return GvCV(gv);
2959 }
2960 return ret;
2961 }
a0288114 2962
601f1833 2963 return NULL;
32251b26
IZ		 2964}
2965
2966
6f1401dc
DM		 2967/* Implement tryAMAGICun_MG macro.
2968 Do get magic, then see if the stack arg is overloaded and if so call it.
2969 Flags:
6f1401dc
DM		 2970 AMGf_numeric apply sv_2num to the stack arg.
2971*/
2972
2973bool
2974Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2975 dSP;
2976 SV* tmpsv;
2977 SV* const arg = TOPs;
2978
2979 SvGETMAGIC(arg);
2980
9f8bf298 2981 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC		 2982 AMGf_noright | AMGf_unary
2983 | (flags & AMGf_numarg))))
2984 {
13874762
DM		 2985 /* where the op is of the form:
2986 * $lex = $x op $y (where the assign is optimised away)
2987 * then assign the returned value to targ and return that;
2988 * otherwise return the value directly
2989 */
2990 if ( (PL_opargs[PL_op->op_type] & OA_TARGLEX)
2991 && (PL_op->op_private & OPpTARGET_MY))
2992 {
2993 dTARGET;
2994 sv_setsv(TARG, tmpsv);
2995 SETTARG;
2996 }
2997 else
2998 SETs(tmpsv);
2999
6f1401dc
DM		 3000 PUTBACK;
3001 return TRUE;
3002 }
3003
3004 if ((flags & AMGf_numeric) && SvROK(arg))
3005 *sp = sv_2num(arg);
3006 return FALSE;
3007}
3008
3009
3010/* Implement tryAMAGICbin_MG macro.
3011 Do get magic, then see if the two stack args are overloaded and if so
3012 call it.
3013 Flags:
6f1401dc
DM		 3014 AMGf_assign op may be called as mutator (eg +=)
3015 AMGf_numeric apply sv_2num to the stack arg.
3016*/
3017
3018bool
3019Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 3020 dSP;
3021 SV* const left = TOPm1s;
3022 SV* const right = TOPs;
3023
3024 SvGETMAGIC(left);
3025 if (left != right)
3026 SvGETMAGIC(right);
3027
3028 if (SvAMAGIC(left) || SvAMAGIC(right)) {
72876cce
DM		 3029 SV * tmpsv;
3030 /* STACKED implies mutator variant, e.g. $x += 1 */
3031 bool mutator = (flags & AMGf_assign) && (PL_op->op_flags & OPf_STACKED);
3032
3033 tmpsv = amagic_call(left, right, method,
3034 (mutator ? AMGf_assign: 0)
636ac8fc 3035 | (flags & AMGf_numarg));
6f1401dc 3036 if (tmpsv) {
13874762
DM		 3037 (void)POPs;
3038 /* where the op is one of the two forms:
3039 * $x op= $y
3040 * $lex = $x op $y (where the assign is optimised away)
3041 * then assign the returned value to targ and return that;
3042 * otherwise return the value directly
3043 */
3044 if ( mutator
3045 || ( (PL_opargs[PL_op->op_type] & OA_TARGLEX)
3046 && (PL_op->op_private & OPpTARGET_MY)))
3047 {
3048 dTARG;
3049 TARG = mutator ? *SP : PAD_SV(PL_op->op_targ);
3050 sv_setsv(TARG, tmpsv);
3051 SETTARG;
3052 }
3053 else
3054 SETs(tmpsv);
3055
6f1401dc
DM		 3056 PUTBACK;
3057 return TRUE;
3058 }
3059 }
13874762 3060
75ea7a12
FC		 3061 if(left==right && SvGMAGICAL(left)) {
3062 SV * const left = sv_newmortal();
3063 *(sp-1) = left;
3064 /* Print the uninitialized warning now, so it includes the vari-
3065 able name. */
3066 if (!SvOK(right)) {
3067 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
3068 sv_setsv_flags(left, &PL_sv_no, 0);
3069 }
3070 else sv_setsv_flags(left, right, 0);
3071 SvGETMAGIC(right);
3072 }
6f1401dc 3073 if (flags & AMGf_numeric) {
75ea7a12
FC		 3074 if (SvROK(TOPm1s))
3075 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 3076 if (SvROK(right))
3077 *sp = sv_2num(right);
3078 }
3079 return FALSE;
3080}
3081
25a9ffce
NC		 3082SV *
3083Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
3084 SV *tmpsv = NULL;
3d147ac2 3085 HV *stash;
25a9ffce
NC		 3086
3087 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
3088
3d147ac2
DM		 3089 if (!SvAMAGIC(ref))
3090 return ref;
3091 /* return quickly if none of the deref ops are overloaded */
3092 stash = SvSTASH(SvRV(ref));
3093 assert(SvOOK(stash));
3094 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
3095 return ref;
3096
3097 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 3098 AMGf_noright | AMGf_unary))) {
3099 if (!SvROK(tmpsv))
3100 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
3101 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
3102 /* Bail out if it returns us the same reference. */
3103 return tmpsv;
3104 }
3105 ref = tmpsv;
3d147ac2
DM		 3106 if (!SvAMAGIC(ref))
3107 break;
25a9ffce
NC		 3108 }
3109 return tmpsv ? tmpsv : ref;
3110}
6f1401dc 3111
8d569291
FC		 3112bool
3113Perl_amagic_is_enabled(pTHX_ int method)
3114{
3115 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
3116
3117 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
3118
3119 if ( !lex_mask || !SvOK(lex_mask) )
3120 /* overloading lexically disabled */
3121 return FALSE;
3122 else if ( lex_mask && SvPOK(lex_mask) ) {
3123 /* we have an entry in the hints hash, check if method has been
3124 * masked by overloading.pm */
3125 STRLEN len;
3126 const int offset = method / 8;
3127 const int bit = method % 8;
3128 char *pv = SvPV(lex_mask, len);
3129
3130 /* Bit set, so this overloading operator is disabled */
3131 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
3132 return FALSE;
3133 }
3134 return TRUE;
3135}
3136
a0d0e21e 3137SV*
864dbfa3 3138Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 3139{
27da23d5 3140 dVAR;
b267980d 3141 MAGIC *mg;
9c5ffd7c 3142 CV *cv=NULL;
a0d0e21e 3143 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3144 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 3145 int off = 0, off1, lr = 0, notfound = 0;
3146 int postpr = 0, force_cpy = 0;
3147 int assign = AMGf_assign & flags;
3148 const int assignshift = assign ? 1 : 0;
bf5522a1 3149 int use_default_op = 0;
67288365 3150 int force_scalar = 0;
497b47a8
JH		 3151#ifdef DEBUGGING
3152 int fl=0;
497b47a8 3153#endif
25716404 3154 HV* stash=NULL;
7918f24d
NC		 3155
3156 PERL_ARGS_ASSERT_AMAGIC_CALL;
3157
e46c382e 3158 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3159 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 3160 }
3161
a0d0e21e 3162 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3163 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3164 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3165 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3166 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3167 : NULL))
b267980d 3168 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 3169 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3170 * usual method */
497b47a8
JH		 3171 (
3172#ifdef DEBUGGING
3173 fl = 1,
a0288114 3174#endif
497b47a8 3175 cv = cvp[off=method])))) {
a0d0e21e
LW		 3176 lr = -1; /* Call method for left argument */
3177 } else {
3178 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3179 int logic;
3180
3181 /* look for substituted methods */
ee239bfe 3182 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 3183 switch (method) {
3184 case inc_amg:
ee239bfe
IZ		 3185 force_cpy = 1;
3186 if ((cv = cvp[off=add_ass_amg])
3187 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3188 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3189 }
3190 break;
3191 case dec_amg:
ee239bfe
IZ		 3192 force_cpy = 1;
3193 if ((cv = cvp[off = subtr_ass_amg])
3194 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3195 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3196 }
3197 break;
3198 case bool__amg:
3199 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3200 break;
3201 case numer_amg:
3202 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3203 break;
3204 case string_amg:
3205 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3206 break;
b7787f18
AL		 3207 case not_amg:
3208 (void)((cv = cvp[off=bool__amg])
3209 || (cv = cvp[off=numer_amg])
3210 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 3211 if (cv)
3212 postpr = 1;
b7787f18 3213 break;
748a9306
LW		 3214 case copy_amg:
3215 {
76e3520e
GS		 3216 /*
3217 * SV* ref causes confusion with the interpreter variable of
3218 * the same name
3219 */
890ce7af 3220 SV* const tmpRef=SvRV(left);
76e3520e 3221 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 3222 /*
3223 * Just to be extra cautious. Maybe in some
3224 * additional cases sv_setsv is safe, too.
3225 */
890ce7af 3226 SV* const newref = newSVsv(tmpRef);
748a9306 3227 SvOBJECT_on(newref);
a1cd65be
FC		 3228 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3229 delegate to the stash. */
85fbaab2 3230 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 3231 return newref;
3232 }
3233 }
3234 break;
a0d0e21e 3235 case abs_amg:
b267980d 3236 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3237 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
725c44f9 3238 SV* const nullsv=&PL_sv_zero;
a0d0e21e 3239 if (off1==lt_amg) {
890ce7af 3240 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e 3241 lt_amg,AMGf_noright);
f4c975aa 3242 logic = SvTRUE_NN(lessp);
a0d0e21e 3243 } else {
890ce7af 3244 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3245 ncmp_amg,AMGf_noright);
3246 logic = (SvNV(lessp) < 0);
3247 }
3248 if (logic) {
3249 if (off==subtr_amg) {
3250 right = left;
748a9306 3251 left = nullsv;
a0d0e21e
LW		 3252 lr = 1;
3253 }
3254 } else {
3255 return left;
3256 }
3257 }
3258 break;
3259 case neg_amg:
155aba94 3260 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e 3261 right = left;
725c44f9 3262 left = &PL_sv_zero;
a0d0e21e
LW		 3263 lr = 1;
3264 }
3265 break;
f216259d 3266 case int_amg:
f5284f61 3267 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3268 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3269 case regexp_amg:
b267980d
NIS		 3270 /* FAIL safe */
3271 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3272
f5284f61
IZ		 3273 case to_sv_amg:
3274 case to_av_amg:
3275 case to_hv_amg:
3276 case to_gv_amg:
3277 case to_cv_amg:
3278 /* FAIL safe */
b267980d 3279 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3280
a0d0e21e
LW		 3281 default:
3282 goto not_found;
3283 }
3284 if (!cv) goto not_found;
3285 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3286 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3287 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3288 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3289 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3290 : NULL))
69815d08
RS		 3291 && (cv = cvp[off=method])) { /* Method for right
3292 * argument found */
3293 lr=1;
bf5522a1
MB		 3294 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3295 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 3296 && !(flags & AMGf_unary)) {
3297 /* We look for substitution for
3298 * comparison operations and
fc36a67e 3299 * concatenation */
a0d0e21e
LW		 3300 if (method==concat_amg || method==concat_ass_amg
3301 || method==repeat_amg || method==repeat_ass_amg) {
3302 return NULL; /* Delegate operation to string conversion */
3303 }
3304 off = -1;
3305 switch (method) {
3306 case lt_amg:
3307 case le_amg:
3308 case gt_amg:
3309 case ge_amg:
3310 case eq_amg:
3311 case ne_amg:
2ab54efd
MB		 3312 off = ncmp_amg;
3313 break;
a0d0e21e
LW		 3314 case slt_amg:
3315 case sle_amg:
3316 case sgt_amg:
3317 case sge_amg:
3318 case seq_amg:
3319 case sne_amg:
2ab54efd
MB		 3320 off = scmp_amg;
3321 break;
a0d0e21e 3322 }
bf5522a1
MB		 3323 if (off != -1) {
3324 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3325 cv = ocvp[off];
3326 lr = -1;
3327 }
3328 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3329 cv = cvp[off];
3330 lr = 1;
3331 }
3332 }
3333 if (cv)
2ab54efd
MB		 3334 postpr = 1;
3335 else
3336 goto not_found;
a0d0e21e 3337 } else {
a6006777 3338 not_found: /* No method found, either report or croak */
b267980d
NIS		 3339 switch (method) {
3340 case to_sv_amg:
3341 case to_av_amg:
3342 case to_hv_amg:
3343 case to_gv_amg:
3344 case to_cv_amg:
3345 /* FAIL safe */
3346 return left; /* Delegate operation to standard mechanisms. */
b267980d 3347 }
a0d0e21e
LW		 3348 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3349 notfound = 1; lr = -1;
3350 } else if (cvp && (cv=cvp[nomethod_amg])) {
3351 notfound = 1; lr = 1;
bf5522a1
MB		 3352 } else if ((use_default_op =
3353 (!ocvp || oamtp->fallback >= AMGfallYES)
3354 && (!cvp || amtp->fallback >= AMGfallYES))
3355 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3356 /* Skip generating the "no method found" message. */
3357 return NULL;
a0d0e21e 3358 } else {
46fc3d4c 3359 SV *msg;
774d564b 3360 if (off==-1) off=method;
b267980d 3361 msg = sv_2mortal(Perl_newSVpvf(aTHX_
147e3846 3362 "Operation \"%s\": no method found,%sargument %s%" SVf "%s%" SVf,
d66cca07
BF		 3363 AMG_id2name(method + assignshift),
3364 (flags & AMGf_unary ? " " : "\n\tleft "),
3365 SvAMAGIC(left)?
3366 "in overloaded package ":
3367 "has no overloaded magic",
3368 SvAMAGIC(left)?
3369 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3370 SVfARG(&PL_sv_no),
3371 SvAMAGIC(right)?
3372 ",\n\tright argument in overloaded package ":
3373 (flags & AMGf_unary
3374 ? ""
3375 : ",\n\tright argument has no overloaded magic"),
3376 SvAMAGIC(right)?
3377 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3378 SVfARG(&PL_sv_no)));
bf5522a1 3379 if (use_default_op) {
147e3846 3380 DEBUG_o( Perl_deb(aTHX_ "%" SVf, SVfARG(msg)) );
a0d0e21e 3381 } else {
147e3846 3382 Perl_croak(aTHX_ "%" SVf, SVfARG(msg));
a0d0e21e
LW		 3383 }
3384 return NULL;
3385 }
ee239bfe 3386 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3387 }
3388 }
67288365
JL		 3389
3390 switch (method) {
3391 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3392 * operation. we need this to return a value, so that it can be assigned
3393 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3394 * increment or decrement was itself called in void context */
3395 case inc_amg:
3396 if (off == add_amg)
3397 force_scalar = 1;
3398 break;
3399 case dec_amg:
3400 if (off == subtr_amg)
3401 force_scalar = 1;
3402 break;
3403 /* in these cases, we're calling an assignment variant of an operator
3404 * (+= rather than +, for instance). regardless of whether it's a
3405 * fallback or not, it always has to return a value, which will be
3406 * assigned to the proper variable later */
3407 case add_amg:
3408 case subtr_amg:
3409 case mult_amg:
3410 case div_amg:
3411 case modulo_amg:
3412 case pow_amg:
3413 case lshift_amg:
3414 case rshift_amg:
3415 case repeat_amg:
3416 case concat_amg:
3417 case band_amg:
3418 case bor_amg:
3419 case bxor_amg:
6d06ecce
FC		 3420 case sband_amg:
3421 case sbor_amg:
3422 case sbxor_amg:
67288365
JL		 3423 if (assign)
3424 force_scalar = 1;
3425 break;
3426 /* the copy constructor always needs to return a value */
3427 case copy_amg:
3428 force_scalar = 1;
3429 break;
3430 /* because of the way these are implemented (they don't perform the
3431 * dereferencing themselves, they return a reference that perl then
3432 * dereferences later), they always have to be in scalar context */
3433 case to_sv_amg:
3434 case to_av_amg:
3435 case to_hv_amg:
3436 case to_gv_amg:
3437 case to_cv_amg:
3438 force_scalar = 1;
3439 break;
3440 /* these don't have an op of their own; they're triggered by their parent
3441 * op, so the context there isn't meaningful ('$a and foo()' in void
3442 * context still needs to pass scalar context on to $a's bool overload) */
3443 case bool__amg:
3444 case numer_amg:
3445 case string_amg:
3446 force_scalar = 1;
3447 break;
3448 }
3449
497b47a8 3450#ifdef DEBUGGING
a0d0e21e 3451 if (!notfound) {
497b47a8 3452 DEBUG_o(Perl_deb(aTHX_
147e3846 3453 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %" SVf "%s\n",
497b47a8
JH		 3454 AMG_id2name(off),
3455 method+assignshift==off? "" :
a0288114 3456 " (initially \"",
497b47a8
JH		 3457 method+assignshift==off? "" :
3458 AMG_id2name(method+assignshift),
a0288114 3459 method+assignshift==off? "" : "\")",
497b47a8
JH		 3460 flags & AMGf_unary? "" :
3461 lr==1 ? " for right argument": " for left argument",
3462 flags & AMGf_unary? " for argument" : "",
d66cca07 3463 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3464 fl? ",\n\tassignment variant used": "") );
ee239bfe 3465 }
497b47a8 3466#endif
748a9306
LW		 3467 /* Since we use shallow copy during assignment, we need
3468 * to dublicate the contents, probably calling user-supplied
3469 * version of copy operator
3470 */
ee239bfe
IZ		 3471 /* We need to copy in following cases:
3472 * a) Assignment form was called.
3473 * assignshift==1, assign==T, method + 1 == off
3474 * b) Increment or decrement, called directly.
3475 * assignshift==0, assign==0, method + 0 == off
3476 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3477 * assignshift==0, assign==T,
ee239bfe
IZ		 3478 * force_cpy == T
3479 * d) Increment or decrement, translated to nomethod.
b267980d 3480 * assignshift==0, assign==0,
ee239bfe
IZ		 3481 * force_cpy == T
3482 * e) Assignment form translated to nomethod.
3483 * assignshift==1, assign==T, method + 1 != off
3484 * force_cpy == T
3485 */
3486 /* off is method, method+assignshift, or a result of opcode substitution.
3487 * In the latter case assignshift==0, so only notfound case is important.
3488 */
73512201 3489 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3490 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3491 || force_cpy) )
6f1401dc 3492 {
1b38c28e
NC		 3493 /* newSVsv does not behave as advertised, so we copy missing
3494 * information by hand */
3495 SV *tmpRef = SvRV(left);
3496 SV *rv_copy;
31d632c3 3497 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3498 SvRV_set(left, rv_copy);
3499 SvSETMAGIC(left);
e7881358 3500 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3501 }
6f1401dc
DM		 3502 }
3503
a0d0e21e
LW		 3504 {
3505 dSP;
3506 BINOP myop;
3507 SV* res;
b7787f18 3508 const bool oldcatch = CATCH_GET;
67288365 3509 I32 oldmark, nret;
e839e6ed
DM		 3510 /* for multiconcat, we may call overload several times,
3511 * with the context of individual concats being scalar,
3512 * regardless of the overall context of the multiconcat op
3513 */
3514 U8 gimme = (force_scalar || PL_op->op_type == OP_MULTICONCAT)
3515 ? G_SCALAR : GIMME_V;
a0d0e21e 3516
54310121 3517 CATCH_SET(TRUE);
a0d0e21e
LW		 3518 Zero(&myop, 1, BINOP);
3519 myop.op_last = (OP *) &myop;
b37c2d43 3520 myop.op_next = NULL;
67288365
JL		 3521 myop.op_flags = OPf_STACKED;
3522
3523 switch (gimme) {
3524 case G_VOID:
3525 myop.op_flags |= OPf_WANT_VOID;
3526 break;
3527 case G_ARRAY:
3528 if (flags & AMGf_want_list) {
3529 myop.op_flags |= OPf_WANT_LIST;
3530 break;
3531 }
3532 /* FALLTHROUGH */
3533 default:
3534 myop.op_flags |= OPf_WANT_SCALAR;
3535 break;
3536 }
a0d0e21e 3537
e788e7d3 3538 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3539 ENTER;
462e5cf6 3540 SAVEOP();
533c011a 3541 PL_op = (OP *) &myop;
3280af22 3542 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3543 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3544 Perl_pp_pushmark(aTHX);
a0d0e21e 3545
924508f0 3546 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3547 PUSHs(lr>0? right: left);
3548 PUSHs(lr>0? left: right);
3280af22 3549 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3550 if (notfound) {
59cd0e26
NC		 3551 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3552 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3553 }
636ac8fc
FC		 3554 else if (flags & AMGf_numarg)
3555 PUSHs(&PL_sv_undef);
3556 if (flags & AMGf_numarg)
3557 PUSHs(&PL_sv_yes);
ad64d0ec 3558 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3559 PUTBACK;
67288365 3560 oldmark = TOPMARK;
a0d0e21e 3561
139d0ce6 3562 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3563 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3564 LEAVE;
3565 SPAGAIN;
67288365
JL		 3566 nret = SP - (PL_stack_base + oldmark);
3567
3568 switch (gimme) {
3569 case G_VOID:
3570 /* returning NULL has another meaning, and we check the context
3571 * at the call site too, so this can be differentiated from the
3572 * scalar case */
3573 res = &PL_sv_undef;
3574 SP = PL_stack_base + oldmark;
3575 break;
2165bd23 3576 case G_ARRAY:
67288365
JL		 3577 if (flags & AMGf_want_list) {
3578 res = sv_2mortal((SV *)newAV());
3579 av_extend((AV *)res, nret);
3580 while (nret--)
3581 av_store((AV *)res, nret, POPs);
3582 break;
3583 }
3584 /* FALLTHROUGH */
67288365
JL		 3585 default:
3586 res = POPs;
3587 break;
3588 }
a0d0e21e 3589
ebafeae7 3590 PUTBACK;
d3acc0f7 3591 POPSTACK;
54310121 3592 CATCH_SET(oldcatch);
a0d0e21e 3593
a0d0e21e 3594 if (postpr) {
b7787f18 3595 int ans;
a0d0e21e
LW		 3596 switch (method) {
3597 case le_amg:
3598 case sle_amg:
3599 ans=SvIV(res)<=0; break;
3600 case lt_amg:
3601 case slt_amg:
3602 ans=SvIV(res)<0; break;
3603 case ge_amg:
3604 case sge_amg:
3605 ans=SvIV(res)>=0; break;
3606 case gt_amg:
3607 case sgt_amg:
3608 ans=SvIV(res)>0; break;
3609 case eq_amg:
3610 case seq_amg:
3611 ans=SvIV(res)==0; break;
3612 case ne_amg:
3613 case sne_amg:
3614 ans=SvIV(res)!=0; break;
3615 case inc_amg:
3616 case dec_amg:
bbce6d69 3617 SvSetSV(left,res); return left;
dc437b57 3618 case not_amg:
f4c975aa 3619 ans=!SvTRUE_NN(res); break;
b7787f18
AL		 3620 default:
3621 ans=0; break;
a0d0e21e 3622 }
54310121 3623 return boolSV(ans);
748a9306
LW		 3624 } else if (method==copy_amg) {
3625 if (!SvROK(res)) {
cea2e8a9 3626 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3627 }
3628 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3629 } else {
3630 return res;
3631 }
3632 }
3633}
c9d5ac95 3634
f5c1e807
NC		 3635void
3636Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3637{
3638 dVAR;
acda4c6a 3639 U32 hash;
f5c1e807 3640
7918f24d 3641 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3642
acda4c6a 3643 if (len > I32_MAX)
147e3846 3644 Perl_croak(aTHX_ "panic: gv name too long (%" UVuf ")", (UV) len);
acda4c6a 3645
ae8cc45f
NC		 3646 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3647 unshare_hek(GvNAME_HEK(gv));
3648 }
3649
acda4c6a 3650 PERL_HASH(hash, name, len);
c60dbbc3 3651 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3652}
3653
66610fdd 3654/*
f7461760
Z		 3655=for apidoc gv_try_downgrade
3656
2867cdbc
Z		 3657If the typeglob C<gv> can be expressed more succinctly, by having
3658something other than a real GV in its place in the stash, replace it
3659with the optimised form. Basic requirements for this are that C<gv>
3660is a real typeglob, is sufficiently ordinary, and is only referenced
3661from its package. This function is meant to be used when a GV has been
3662looked up in part to see what was there, causing upgrading, but based
3663on what was found it turns out that the real GV isn't required after all.
3664
3665If C<gv> is a completely empty typeglob, it is deleted from the stash.
3666
3667If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3668sub, the typeglob is replaced with a scalar-reference placeholder that
3669more compactly represents the same thing.
f7461760
Z		 3670
3671=cut
3672*/
3673
3674void
3675Perl_gv_try_downgrade(pTHX_ GV *gv)
3676{
3677 HV *stash;
3678 CV *cv;
3679 HEK *namehek;
3680 SV **gvp;
3681 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3682
3683 /* XXX Why and where does this leave dangling pointers during global
3684 destruction? */
627364f1 3685 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3686
2867cdbc 3687 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3688 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3689 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3690 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3691 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3692 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3693 return;
2be08ad1
FC		 3694 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3695 return;
803f2748
DM		 3696 if (SvMAGICAL(gv)) {
3697 MAGIC *mg;
3698 /* only backref magic is allowed */
3699 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3700 return;
3701 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3702 if (mg->mg_type != PERL_MAGIC_backref)
3703 return;
3704 }
3705 }
2867cdbc
Z		 3706 cv = GvCV(gv);
3707 if (!cv) {
3708 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3709 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3710 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3711 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3712 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z		 3713 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3714 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3715 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3716 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3717 *gvp == (SV*)gv) {
3718 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3719 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3720 SvREFCNT(gv) = 0;
3721 sv_clear((SV*)gv);
3722 SvREFCNT(gv) = 1;
70e5f2b5 3723 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH		 3724
3725 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z		 3726 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3727 STRUCT_OFFSET(XPVIV, xiv_iv));
3728 SvRV_set(gv, value);
3729 }
3730}
3731
9e3fb20c
FC		 3732GV *
3733Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3734{
3735 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3736 GV * const *gvp;
3737 PERL_ARGS_ASSERT_GV_OVERRIDE;
3738 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3739 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3740 gv = gvp ? *gvp : NULL;
3741 if (gv && !isGV(gv)) {
3742 if (!SvPCS_IMPORTED(gv)) return NULL;
3743 gv_init(gv, PL_globalstash, name, len, 0);
3744 return gv;
3745 }
3746 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3747}
3748
4aaa4757
FC		 3749#include "XSUB.h"
3750
3751static void
3752core_xsub(pTHX_ CV* cv)
3753{
3754 Perl_croak(aTHX_
3755 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3756 );
3757}
3758
f7461760 3759/*
14d04a33 3760 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3761 */
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