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Eliminate opASSIGN macro usage from core
[perl5.git] / gv.c
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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW
20 */
21
ccfc67b7
JH
22/*
23=head1 GV Functions
166f8a29
DM
24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH
32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
6ffcffbd 37#include "overload.inc"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a 41static const char S_autoload[] = "AUTOLOAD";
3c81f0b3 42#define S_autolen (sizeof("AUTOLOAD")-1)
5c7983e5 43
13c59d41
MH
44GV *
45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13c59d41
MH
49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
13be902c 53 && SvTYPE((const SV *)gv) != SVt_PVLV
13c59d41 54 )
13be902c 55 ) {
bb85b28a 56 const char *what;
13c59d41 57 if (type == SVt_PVIO) {
bb85b28a
NC
58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
13c59d41 64 } else if (type == SVt_PVHV) {
bb85b28a
NC
65 what = "hash";
66 } else {
13c59d41 67 what = type == SVt_PVAV ? "array" : "scalar";
bb85b28a 68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896 72
13c59d41
MH
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
13c59d41
MH
83 if (!*where)
84 {
85 *where = newSV_type(type);
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 :
498a02d8 528 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC
529 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
530 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
531 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 532 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 533 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 534 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 535 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 536 case KEY_state: case KEY_sub :
46bef06f 537 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
7896dde7 538 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
88b892d8 539 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC
540 return NULL;
541 case KEY_chdir:
eb31eb35 542 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
73665bc4 543 case KEY_eof : case KEY_exec: case KEY_exists :
0f8d4b5e 544 case KEY_lstat:
bea284c8 545 case KEY_split:
0f8d4b5e
FC
546 case KEY_stat:
547 case KEY_system:
548 case KEY_truncate: case KEY_unlink:
0f8d4b5e
FC
549 ampable = FALSE;
550 }
551 if (!gv) {
552 gv = (GV *)newSV(0);
553 gv_init(gv, stash, name, len, TRUE);
554 }
7e68c38b 555 GvMULTI_on(gv);
0f8d4b5e
FC
556 if (ampable) {
557 ENTER;
558 oldcurcop = PL_curcop;
559 oldparser = PL_parser;
560 lex_start(NULL, NULL, 0);
561 oldcompcv = PL_compcv;
562 PL_compcv = NULL; /* Prevent start_subparse from setting
563 CvOUTSIDE. */
564 oldsavestack_ix = start_subparse(FALSE,0);
565 cv = PL_compcv;
566 }
567 else {
568 /* Avoid calling newXS, as it calls us, and things start to
569 get hairy. */
570 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
571 GvCV_set(gv,cv);
572 GvCVGEN(gv) = 0;
0f8d4b5e
FC
573 CvISXSUB_on(cv);
574 CvXSUB(cv) = core_xsub;
eacbb379 575 PoisonPADLIST(cv);
0f8d4b5e
FC
576 }
577 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
578 from PL_curcop. */
9b669ea1
DD
579 /* XSUBs can't be perl lang/perl5db.pl debugged
580 if (PERLDB_LINE_OR_SAVESRC)
581 (void)gv_fetchfile(file); */
0f8d4b5e
FC
582 CvFILE(cv) = (char *)file;
583 /* XXX This is inefficient, as doing things this order causes
584 a prototype check in newATTRSUB. But we have to do
585 it this order as we need an op number before calling
586 new ATTRSUB. */
587 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 588 if (stash)
73c02f15 589 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 590 if (ampable) {
4428fb0e
TC
591#ifdef DEBUGGING
592 CV *orig_cv = cv;
593#endif
0f8d4b5e 594 CvLVALUE_on(cv);
4428fb0e
TC
595 /* newATTRSUB will free the CV and return NULL if we're still
596 compiling after a syntax error */
e8f91c91 597 if ((cv = newATTRSUB_x(
7e68c38b 598 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC
599 NULL,NULL,
600 coresub_op(
601 opnum
602 ? newSVuv((UV)opnum)
603 : newSVpvn(name,len),
604 code, opnum
7e68c38b 605 ),
e8f91c91 606 TRUE
4428fb0e
TC
607 )) != NULL) {
608 assert(GvCV(gv) == orig_cv);
609 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
cd642408 610 && opnum != OP_UNDEF && opnum != OP_KEYS)
4428fb0e
TC
611 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
612 }
0f8d4b5e
FC
613 LEAVE;
614 PL_parser = oldparser;
615 PL_curcop = oldcurcop;
616 PL_compcv = oldcompcv;
617 }
4428fb0e 618 if (cv) {
a83b92fa
Z
619 SV *opnumsv = newSViv(
620 (opnum == OP_ENTEREVAL && len == 9 && memEQ(name, "evalbytes", 9)) ?
621 (OP_ENTEREVAL | (1<<16))
622 : opnum ? opnum : (((I32)name[2]) << 16));
623 cv_set_call_checker_flags(cv, Perl_ck_entersub_args_core, opnumsv, 0);
624 SvREFCNT_dec_NN(opnumsv);
4428fb0e
TC
625 }
626
0f8d4b5e
FC
627 return gv;
628}
629
954c1994 630/*
6c53d59b
FC
631=for apidoc gv_fetchmeth
632
633Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
634
e6919483
BF
635=for apidoc gv_fetchmeth_sv
636
637Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
638of an SV instead of a string/length pair.
639
640=cut
641*/
642
643GV *
644Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
645{
c290e187 646 char *namepv;
647 STRLEN namelen;
648 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
649 if (LIKELY(SvPOK_nog(namesv))) /* common case */
14062320
FC
650 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level,
651 flags | SvUTF8(namesv));
c290e187 652 namepv = SvPV(namesv, namelen);
653 if (SvUTF8(namesv)) flags |= SVf_UTF8;
654 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF
655}
656
657/*
658=for apidoc gv_fetchmeth_pv
659
660Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
661instead of a string/length pair.
662
663=cut
664*/
665
666GV *
667Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
668{
669 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 670 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF
671}
672
673/*
674=for apidoc gv_fetchmeth_pvn
954c1994
GS
675
676Returns the glob with the given C<name> and a defined subroutine or
677C<NULL>. The glob lives in the given C<stash>, or in the stashes
796b6530 678accessible via C<@ISA> and C<UNIVERSAL::>.
954c1994
GS
679
680The argument C<level> should be either 0 or -1. If C<level==0>, as a
681side-effect creates a glob with the given C<name> in the given C<stash>
682which in the case of success contains an alias for the subroutine, and sets
e1a479c5 683up caching info for this glob.
954c1994 684
796b6530 685The only significant values for C<flags> are C<GV_SUPER> and C<SVf_UTF8>.
aae43805 686
796b6530 687C<GV_SUPER> indicates that we want to look up the method in the superclasses
aae43805 688of the C<stash>.
e6919483 689
aae43805 690The
954c1994 691GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 692visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 693the GV directly; instead, you should use the method's CV, which can be
b267980d 694obtained from the GV with the C<GvCV> macro.
954c1994
GS
695
696=cut
697*/
698
e1a479c5
BB
699/* NOTE: No support for tied ISA */
700
c6afe666 701PERL_STATIC_INLINE GV*
702S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 703{
463ee0b2 704 GV** gvp;
c6afe666 705 HE* he;
e1a479c5
BB
706 AV* linear_av;
707 SV** linear_svp;
708 SV* linear_sv;
aae43805 709 HV* cstash, *cachestash;
e1a479c5
BB
710 GV* candidate = NULL;
711 CV* cand_cv = NULL;
e1a479c5 712 GV* topgv = NULL;
bfcb3514 713 const char *hvname;
c6afe666 714 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 715 I32 items;
e1a479c5 716 U32 topgen_cmp;
04f3bf56 717 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 718
af09ea45
IK
719 /* UNIVERSAL methods should be callable without a stash */
720 if (!stash) {
e1a479c5 721 create = 0; /* probably appropriate */
da51bb9b 722 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK
723 return 0;
724 }
725
e1a479c5
BB
726 assert(stash);
727
bfcb3514
NC
728 hvname = HvNAME_get(stash);
729 if (!hvname)
e1a479c5 730 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 731
e1a479c5 732 assert(hvname);
55df6700 733 assert(name || meth);
463ee0b2 734
aae43805 735 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC
736 flags & GV_SUPER ? "SUPER " : "",
737 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 738
dd69841b 739 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 740
aae43805 741 if (flags & GV_SUPER) {
1a33a059
FC
742 if (!HvAUX(stash)->xhv_mro_meta->super)
743 HvAUX(stash)->xhv_mro_meta->super = newHV();
744 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC
745 }
746 else cachestash = stash;
747
e1a479c5 748 /* check locally for a real method or a cache entry */
c6afe666 749 he = (HE*)hv_common(
1cde3371 750 cachestash, meth, name, len, is_utf8 ? HVhek_UTF8 : 0, create, NULL, 0
c6afe666 751 );
752 if (he) gvp = (GV**)&HeVAL(he);
753 else gvp = NULL;
754
e1a479c5
BB
755 if(gvp) {
756 topgv = *gvp;
0f8d4b5e 757 have_gv:
e1a479c5
BB
758 assert(topgv);
759 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC
760 {
761 if (!name)
762 name = SvPV_nomg(meth, len);
04ec7e59 763 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 764 }
e1a479c5
BB
765 if ((cand_cv = GvCV(topgv))) {
766 /* If genuine method or valid cache entry, use it */
767 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
768 return topgv;
769 }
770 else {
771 /* stale cache entry, junk it and move on */
e7881358 772 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM
773 GvCV_set(topgv, NULL);
774 cand_cv = NULL;
e1a479c5
BB
775 GvCVGEN(topgv) = 0;
776 }
777 }
778 else if (GvCVGEN(topgv) == topgen_cmp) {
779 /* cache indicates no such method definitively */
780 return 0;
781 }
aae43805 782 else if (stash == cachestash
b59bf0b2
KW
783 && len > 1 /* shortest is uc */
784 && memEQs(hvname, HvNAMELEN_get(stash), "CORE")
87566176 785 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 786 goto have_gv;
463ee0b2 787 }
79072805 788
aae43805 789 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB
790 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
791 items = AvFILLp(linear_av); /* no +1, to skip over self */
792 while (items--) {
793 linear_sv = *linear_svp++;
794 assert(linear_sv);
795 cstash = gv_stashsv(linear_sv, 0);
796
dd69841b 797 if (!cstash) {
ecad31f0 798 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
147e3846 799 "Can't locate package %" SVf " for @%" HEKf "::ISA",
ecad31f0 800 SVfARG(linear_sv),
d0c0e7dd 801 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB
802 continue;
803 }
9607fc9c 804
e1a479c5
BB
805 assert(cstash);
806
202cd98a
SA
807 gvp = (GV**)hv_common(
808 cstash, meth, name, len, is_utf8 ? HVhek_UTF8 : 0, HV_FETCH_JUST_SV, NULL, 0
809 );
0f8d4b5e
FC
810 if (!gvp) {
811 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
812 const char *hvname = HvNAME(cstash); assert(hvname);
c8b388b0 813 if (strBEGINs(hvname, "CORE")
0f8d4b5e 814 && (candidate =
87566176 815 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC
816 ))
817 goto have_candidate;
818 }
819 continue;
820 }
821 else candidate = *gvp;
822 have_candidate:
e1a479c5 823 assert(candidate);
04f3bf56 824 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 825 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
826 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
827 /*
828 * Found real method, cache method in topgv if:
829 * 1. topgv has no synonyms (else inheritance crosses wires)
830 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
831 */
832 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
833 CV *old_cv = GvCV(topgv);
834 SvREFCNT_dec(old_cv);
e1a479c5 835 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 836 GvCV_set(topgv, cand_cv);
e1a479c5
BB
837 GvCVGEN(topgv) = topgen_cmp;
838 }
839 return candidate;
840 }
841 }
9607fc9c 842
e1a479c5
BB
843 /* Check UNIVERSAL without caching */
844 if(level == 0 || level == -1) {
55df6700
FC
845 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
846 flags &~GV_SUPER);
e1a479c5
BB
847 if(candidate) {
848 cand_cv = GvCV(candidate);
849 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
850 CV *old_cv = GvCV(topgv);
851 SvREFCNT_dec(old_cv);
e1a479c5 852 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 853 GvCV_set(topgv, cand_cv);
e1a479c5
BB
854 GvCVGEN(topgv) = topgen_cmp;
855 }
856 return candidate;
857 }
858 }
859
860 if (topgv && GvREFCNT(topgv) == 1) {
861 /* cache the fact that the method is not defined */
862 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW
863 }
864
79072805
LW
865 return 0;
866}
867
c6afe666 868GV *
869Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
870{
871 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
872 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
873}
874
954c1994 875/*
460e5730
FC
876=for apidoc gv_fetchmeth_autoload
877
878This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
879parameter.
880
d21989ed 881=for apidoc gv_fetchmeth_sv_autoload
611c1e95 882
d21989ed
BF
883Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
884of an SV instead of a string/length pair.
885
886=cut
887*/
888
889GV *
890Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
891{
892 char *namepv;
893 STRLEN namelen;
894 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
895 namepv = SvPV(namesv, namelen);
896 if (SvUTF8(namesv))
897 flags |= SVf_UTF8;
898 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
899}
900
901/*
902=for apidoc gv_fetchmeth_pv_autoload
903
904Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
905instead of a string/length pair.
906
907=cut
908*/
909
910GV *
911Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
912{
913 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
914 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
915}
916
917/*
918=for apidoc gv_fetchmeth_pvn_autoload
919
796b6530 920Same as C<gv_fetchmeth_pvn()>, but looks for autoloaded subroutines too.
611c1e95
IZ
921Returns a glob for the subroutine.
922
923For an autoloaded subroutine without a GV, will create a GV even
796b6530 924if C<level < 0>. For an autoloaded subroutine without a stub, C<GvCV()>
611c1e95
IZ
925of the result may be zero.
926
796b6530 927Currently, the only significant value for C<flags> is C<SVf_UTF8>.
d21989ed 928
611c1e95
IZ
929=cut
930*/
931
932GV *
d21989ed 933Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 934{
499321d3 935 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 936
d21989ed 937 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 938
611c1e95 939 if (!gv) {
611c1e95
IZ
940 CV *cv;
941 GV **gvp;
942
943 if (!stash)
6136c704 944 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 945 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 946 return NULL;
d21989ed 947 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 948 return NULL;
611c1e95
IZ
949 cv = GvCV(gv);
950 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 951 return NULL;
611c1e95
IZ
952 /* Have an autoload */
953 if (level < 0) /* Cannot do without a stub */
d21989ed 954 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF
955 gvp = (GV**)hv_fetch(stash, name,
956 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 957 if (!gvp)
6136c704 958 return NULL;
611c1e95
IZ
959 return *gvp;
960 }
961 return gv;
962}
963
964/*
954c1994
GS
965=for apidoc gv_fetchmethod_autoload
966
967Returns the glob which contains the subroutine to call to invoke the method
968on the C<stash>. In fact in the presence of autoloading this may be the
796b6530 969glob for "AUTOLOAD". In this case the corresponding variable C<$AUTOLOAD> is
b267980d 970already setup.
954c1994
GS
971
972The third parameter of C<gv_fetchmethod_autoload> determines whether
973AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 974means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 975Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 976with a non-zero C<autoload> parameter.
954c1994 977
cec2d7b1
FC
978These functions grant C<"SUPER"> token
979as a prefix of the method name. Note
954c1994
GS
980that if you want to keep the returned glob for a long time, you need to
981check for it being "AUTOLOAD", since at the later time the call may load a
796b6530 982different subroutine due to C<$AUTOLOAD> changing its value. Use the glob
cec2d7b1 983created as a side effect to do this.
954c1994 984
cec2d7b1
FC
985These functions have the same side-effects as C<gv_fetchmeth> with
986C<level==0>. The warning against passing the GV returned by
987C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS
988
989=cut
990*/
991
dc848c6f 992GV *
864dbfa3 993Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 994{
547bb267
NC
995 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
996
256d1bb2
NC
997 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
998}
999
44130a26
BF
1000GV *
1001Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
1002{
1003 char *namepv;
1004 STRLEN namelen;
1005 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
1006 namepv = SvPV(namesv, namelen);
1007 if (SvUTF8(namesv))
1008 flags |= SVf_UTF8;
1009 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
1010}
1011
1012GV *
1013Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1014{
1015 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1016 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1017}
1018
256d1bb2 1019GV *
44130a26 1020Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1021{
65308f87
YO
1022 const char * const origname = name;
1023 const char * const name_end = name + len;
e2cace1e 1024 const char *last_separator = NULL;
a0d0e21e 1025 GV* gv;
0dae17bd 1026 HV* ostash = stash;
ad64d0ec 1027 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
1028 const U32 autoload = flags & GV_AUTOLOAD;
1029 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1030 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1031
44130a26 1032 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1033
eff494dd 1034 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1035 stash = NULL;
c9bf4021 1036 else {
e2cace1e 1037 /* The only way stash can become NULL later on is if last_separator is set,
c9bf4021
NC
1038 which in turn means that there is no need for a SVt_PVHV case
1039 the error reporting code. */
1040 }
b267980d 1041
cfb73676
YO
1042 {
1043 /* check if the method name is fully qualified or
1044 * not, and separate the package name from the actual
1045 * method name.
1046 *
1047 * leaves last_separator pointing to the beginning of the
1048 * last package separator (either ' or ::) or 0
1049 * if none was found.
1050 *
1051 * leaves name pointing at the beginning of the
1052 * method name.
1053 */
1054 const char *name_cursor = name;
1055 const char * const name_em1 = name_end - 1; /* name_end minus 1 */
1056 for (name_cursor = name; name_cursor < name_end ; name_cursor++) {
1057 if (*name_cursor == '\'') {
1058 last_separator = name_cursor;
1059 name = name_cursor + 1;
1060 }
1061 else if (name_cursor < name_em1 && *name_cursor == ':' && name_cursor[1] == ':') {
1062 last_separator = name_cursor++;
1063 name = name_cursor + 1;
1064 }
1065 }
a0d0e21e 1066 }
cfb73676
YO
1067
1068 /* did we find a separator? */
e2cace1e 1069 if (last_separator) {
9b7f107c
YO
1070 STRLEN sep_len= last_separator - origname;
1071 if ( memEQs(origname, sep_len, "SUPER")) {
9607fc9c 1072 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC
1073 stash = CopSTASH(PL_curcop);
1074 flags |= GV_SUPER;
cea2e8a9 1075 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1076 origname, HvENAME_get(stash), name) );
4633a7c4 1077 }
47324b4e
KW
1078 else if ( sep_len >= 7 &&
1079 strBEGINs(last_separator - 7, "::SUPER")) {
aae43805 1080 /* don't autovifify if ->NoSuchStash::SUPER::method */
9b7f107c 1081 stash = gv_stashpvn(origname, sep_len - 7, is_utf8);
aae43805
FC
1082 if (stash) flags |= GV_SUPER;
1083 }
e189a56d 1084 else {
af09ea45 1085 /* don't autovifify if ->NoSuchStash::method */
9b7f107c 1086 stash = gv_stashpvn(origname, sep_len, is_utf8);
e189a56d 1087 }
0dae17bd 1088 ostash = stash;
4633a7c4
LW
1089 }
1090
65308f87 1091 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags);
a0d0e21e 1092 if (!gv) {
7da9d78d
AB
1093 /* This is the special case that exempts Foo->import and
1094 Foo->unimport from being an error even if there's no
1095 import/unimport subroutine */
0740a29d
Z
1096 if (strEQ(name,"import") || strEQ(name,"unimport")) {
1097 gv = (GV*)sv_2mortal((SV*)newCONSTSUB_flags(NULL,
1098 NULL, 0, 0, NULL));
1099 } else if (autoload)
c8416c26 1100 gv = gv_autoload_pvn(
65308f87 1101 ostash, name, name_end - name, GV_AUTOLOAD_ISMETHOD|flags
c8416c26 1102 );
256d1bb2
NC
1103 if (!gv && do_croak) {
1104 /* Right now this is exclusively for the benefit of S_method_common
1105 in pp_hot.c */
1106 if (stash) {
15e6cdd9
DG
1107 /* If we can't find an IO::File method, it might be a call on
1108 * a filehandle. If IO:File has not been loaded, try to
1109 * require it first instead of croaking */
1110 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1111 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1112 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1113 STR_WITH_LEN("IO/File.pm"), 0,
1114 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1115 ) {
31b05a0f 1116 require_pv("IO/File.pm");
65308f87 1117 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags);
15e6cdd9
DG
1118 if (gv)
1119 return gv;
1120 }
256d1bb2 1121 Perl_croak(aTHX_
147e3846
KW
1122 "Can't locate object method \"%" UTF8f
1123 "\" via package \"%" HEKf "\"",
65308f87 1124 UTF8fARG(is_utf8, name_end - name, name),
d0c0e7dd 1125 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC
1126 }
1127 else {
ecad31f0 1128 SV* packnamesv;
256d1bb2 1129
e2cace1e
YO
1130 if (last_separator) {
1131 packnamesv = newSVpvn_flags(origname, last_separator - origname,
ecad31f0 1132 SVs_TEMP | is_utf8);
256d1bb2 1133 } else {
017c5e4e 1134 packnamesv = error_report;
256d1bb2
NC
1135 }
1136
1137 Perl_croak(aTHX_
147e3846
KW
1138 "Can't locate object method \"%" UTF8f
1139 "\" via package \"%" SVf "\""
1140 " (perhaps you forgot to load \"%" SVf "\"?)",
65308f87 1141 UTF8fARG(is_utf8, name_end - name, name),
ecad31f0 1142 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1143 }
1144 }
463ee0b2 1145 }
dc848c6f 1146 else if (autoload) {
9d4ba2ae 1147 CV* const cv = GvCV(gv);
09280a33
CS
1148 if (!CvROOT(cv) && !CvXSUB(cv)) {
1149 GV* stubgv;
1150 GV* autogv;
1151
0c028dca 1152 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS
1153 stubgv = gv;
1154 else {
1155 stubgv = CvGV(cv);
1156 if (GvCV(stubgv) != cv) /* orphaned import */
1157 stubgv = gv;
1158 }
c8416c26
BF
1159 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1160 GvNAME(stubgv), GvNAMELEN(stubgv),
1161 GV_AUTOLOAD_ISMETHOD
1162 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1163 if (autogv)
1164 gv = autogv;
1165 }
1166 }
44a8e56a
PP
1167
1168 return gv;
1169}
1170
1171GV*
0eeb01b9 1172Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1173{
1174 char *namepv;
1175 STRLEN namelen;
0fe84f7c 1176 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1177 namepv = SvPV(namesv, namelen);
1178 if (SvUTF8(namesv))
1179 flags |= SVf_UTF8;
0eeb01b9 1180 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1181}
1182
1183GV*
0eeb01b9 1184Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1185{
0fe84f7c 1186 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1187 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1188}
1189
1190GV*
0eeb01b9 1191Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1192{
44a8e56a
PP
1193 GV* gv;
1194 CV* cv;
1195 HV* varstash;
1196 GV* vargv;
1197 SV* varsv;
c8416c26
BF
1198 SV *packname = NULL;
1199 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1200
0fe84f7c 1201 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1202
7edbdc6b 1203 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1204 return NULL;
0dae17bd
GS
1205 if (stash) {
1206 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1207 STRLEN packname_len = 0;
1208 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1209 packname = newSVpvn_flags(packname_ptr, packname_len,
1210 SVs_TEMP | SvUTF8(stash));
5c284bb0 1211 stash = NULL;
0dae17bd 1212 }
c8416c26
BF
1213 else
1214 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1215 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1216 }
257dc59d
FC
1217 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1218 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1219 return NULL;
dc848c6f
PP
1220 cv = GvCV(gv);
1221
adb5a9ae 1222 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1223 return NULL;
ed850460 1224
dc848c6f 1225 /*
64278e8c 1226 * Inheriting AUTOLOAD for non-methods no longer works
dc848c6f 1227 */
0eeb01b9
FC
1228 if (
1229 !(flags & GV_AUTOLOAD_ISMETHOD)
1230 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1231 )
64278e8c
A
1232 Perl_croak(aTHX_ "Use of inherited AUTOLOAD for non-method %" SVf
1233 "::%" UTF8f "() is no longer allowed",
ecad31f0 1234 SVfARG(packname),
b17a0679 1235 UTF8fARG(is_utf8, len, name));
44a8e56a 1236
aed2304a 1237 if (CvISXSUB(cv)) {
bb619f37
FC
1238 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1239 * and split that value on the last '::', pass along the same data
1240 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC
1241 *
1242 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1243 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC
1244 * type. Since SvPVX has been documented as returning the sub name
1245 * for a long time, but not as returning the prototype, we have
1246 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1247 * elsewhere.
1248 *
1249 * We put the prototype in the same allocated buffer, but after
1250 * the sub name. The SvPOK flag indicates the presence of a proto-
1251 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1252 * If both flags are on, then SvLEN is used to indicate the end of
1253 * the prototype (artificially lower than what is actually allo-
1254 * cated), at the risk of having to reallocate a few bytes unneces-
1255 * sarily--but that should happen very rarely, if ever.
1256 *
1257 * We use SvUTF8 for both prototypes and sub names, so if one is
1258 * UTF8, the other must be upgraded.
adb5a9ae 1259 */
c68d9564 1260 CvSTASH_set(cv, stash);
8fa6a409 1261 if (SvPOK(cv)) { /* Ouch! */
e7881358 1262 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC
1263 STRLEN ulen;
1264 const char *proto = CvPROTO(cv);
1265 assert(proto);
1266 if (SvUTF8(cv))
1267 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1268 ulen = SvCUR(tmpsv);
1269 SvCUR(tmpsv)++; /* include null in string */
1270 sv_catpvn_flags(
1271 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1272 );
1273 SvTEMP_on(tmpsv); /* Allow theft */
1274 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1275 SvTEMP_off(tmpsv);
e7881358 1276 SvREFCNT_dec_NN(tmpsv);
59c3c222 1277 SvLEN_set(cv, SvCUR(cv) + 1);
8fa6a409
FC
1278 SvCUR(cv) = ulen;
1279 }
1280 else {
1281 sv_setpvn((SV *)cv, name, len);
1282 SvPOK_off(cv);
1283 if (is_utf8)
c8416c26 1284 SvUTF8_on(cv);
8fa6a409
FC
1285 else SvUTF8_off(cv);
1286 }
1287 CvAUTOLOAD_on(cv);
adb5a9ae 1288 }
adb5a9ae 1289
44a8e56a
PP
1290 /*
1291 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1292 * The subroutine's original name may not be "AUTOLOAD", so we don't
1293 * use that, but for lack of anything better we will use the sub's
1294 * original package to look up $AUTOLOAD.
1295 */
18691622 1296 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1297 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1298 ENTER;
1299
c69033f2 1300 if (!isGV(vargv)) {
04ec7e59 1301 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1302#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1303 GvSV(vargv) = newSV(0);
c69033f2
NC
1304#endif
1305 }
3d35f11b 1306 LEAVE;
e203899d 1307 varsv = GvSVn(vargv);
4bac9ae4
CS
1308 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1309 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1310 sv_setsv(varsv, packname);
396482e1 1311 sv_catpvs(varsv, "::");
d40bf27b
NC
1312 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1313 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC
1314 sv_catpvn_flags(
1315 varsv, name, len,
5bcd1ef4 1316 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1317 );
c8416c26
BF
1318 if (is_utf8)
1319 SvUTF8_on(varsv);
a0d0e21e
LW
1320 return gv;
1321}
1322
44a2ac75
YO
1323
1324/* require_tie_mod() internal routine for requiring a module
486ec47a 1325 * that implements the logic of automatic ties like %! and %-
e94ea821
FC
1326 * It loads the module and then calls the _tie_it subroutine
1327 * with the passed gv as an argument.
44a2ac75
YO
1328 *
1329 * The "gv" parameter should be the glob.
ee33cc1a 1330 * "varname" holds the 1-char name of the var, used for error messages.
45cbc99a 1331 * "namesv" holds the module name. Its refcount will be decremented.
45cbc99a 1332 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1333 * For the protection of $! to work (it is set by this routine)
1334 * the sv slot must already be magicalized.
d2c93421 1335 */
e94ea821 1336STATIC void
ee33cc1a 1337S_require_tie_mod(pTHX_ GV *gv, const char varname, const char * name,
a1683482 1338 STRLEN len, const U32 flags)
d2c93421 1339{
e94ea821 1340 const SV * const target = varname == '[' ? GvSV(gv) : (SV *)GvHV(gv);
45cbc99a 1341
7918f24d
NC
1342 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1343
e94ea821
FC
1344 /* If it is not tied */
1345 if (!target || !SvRMAGICAL(target)
1346 || !mg_find(target,
1347 varname == '[' ? PERL_MAGIC_tiedscalar : PERL_MAGIC_tied))
1348 {
1349 HV *stash;
1350 GV **gvp;
1351 dSP;
1352
655f5b26 1353 PUSHSTACKi(PERLSI_MAGIC);
e94ea821 1354 ENTER;
e94ea821 1355
6881372e
FC
1356#define GET_HV_FETCH_TIE_FUNC \
1357 ( (gvp = (GV **)hv_fetchs(stash, "_tie_it", 0)) \
1358 && *gvp \
1359 && ( (isGV(*gvp) && GvCV(*gvp)) \
1360 || (SvROK(*gvp) && SvTYPE(SvRV(*gvp)) == SVt_PVCV) ) \
1361 )
e94ea821
FC
1362
1363 /* Load the module if it is not loaded. */
360cebfd 1364 if (!(stash = gv_stashpvn(name, len, 0))
6881372e 1365 || ! GET_HV_FETCH_TIE_FUNC)
e94ea821 1366 {
360cebfd 1367 SV * const module = newSVpvn(name, len);
b82b06b8 1368 const char type = varname == '[' ? '$' : '%';
44a2ac75 1369 if ( flags & 1 )
45cbc99a 1370 save_scalar(gv);
5b2ef88e 1371 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1372 assert(sp == PL_stack_sp);
360cebfd 1373 stash = gv_stashpvn(name, len, 0);
44a2ac75 1374 if (!stash)
360cebfd
FC
1375 Perl_croak(aTHX_ "panic: Can't use %c%c because %s is not available",
1376 type, varname, name);
6881372e 1377 else if (! GET_HV_FETCH_TIE_FUNC)
360cebfd
FC
1378 Perl_croak(aTHX_ "panic: Can't use %c%c because %s does not define _tie_it",
1379 type, varname, name);
e94ea821
FC
1380 }
1381 /* Now call the tie function. It should be in *gvp. */
6881372e 1382 assert(gvp); assert(*gvp);
e94ea821
FC
1383 PUSHMARK(SP);
1384 XPUSHs((SV *)gv);
1385 PUTBACK;
1386 call_sv((SV *)*gvp, G_VOID|G_DISCARD);
1387 LEAVE;
655f5b26 1388 POPSTACK;
d2c93421
RH
1389 }
1390}
1391
7c719134
YO
1392/* add a require_tie_mod_s - the _s suffix is similar to pvs type suffixes,
1393 * IOW it means we do STR_WITH_LEN() ourselves and the user should pass in
1394 * a true string WITHOUT a len.
1395 */
1396#define require_tie_mod_s(gv, varname, name, flags) \
1397 S_require_tie_mod(aTHX_ gv, varname, STR_WITH_LEN(name), flags)
1398
954c1994
GS
1399/*
1400=for apidoc gv_stashpv
1401
da51bb9b 1402Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1403determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1404
1405=cut
1406*/
1407
a0d0e21e 1408HV*
864dbfa3 1409Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1410{
7918f24d 1411 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1412 return gv_stashpvn(name, strlen(name), create);
1413}
1414
bc96cb06
SH
1415/*
1416=for apidoc gv_stashpvn
1417
da51bb9b
NC
1418Returns a pointer to the stash for a specified package. The C<namelen>
1419parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1420to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1421created if it does not already exist. If the package does not exist and
796b6530 1422C<flags> is 0 (or any other setting that does not create packages) then C<NULL>
da51bb9b
NC
1423is returned.
1424
566a4718
YO
1425Flags may be one of:
1426
1427 GV_ADD
1428 SVf_UTF8
1429 GV_NOADD_NOINIT
1430 GV_NOINIT
1431 GV_NOEXPAND
1432 GV_ADDMG
1433
796b6530 1434The most important of which are probably C<GV_ADD> and C<SVf_UTF8>.
bc96cb06 1435
808724c8 1436Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1437recommended for performance reasons.
1438
bc96cb06
SH
1439=cut
1440*/
1441
0eadbdad
YO
1442/*
1443gv_stashpvn_internal
1444
1445Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1446as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1447
1448*/
1449
4e7ebec5 1450PERL_STATIC_INLINE HV*
0eadbdad 1451S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1452{
0cea0058 1453 char smallbuf[128];
46fc3d4c 1454 char *tmpbuf;
a0d0e21e
LW
1455 HV *stash;
1456 GV *tmpgv;
add0ecde 1457 U32 tmplen = namelen + 2;
dc437b57 1458
0eadbdad 1459 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1460
add0ecde 1461 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1462 tmpbuf = smallbuf;
1463 else
add0ecde
VP
1464 Newx(tmpbuf, tmplen, char);
1465 Copy(name, tmpbuf, namelen, char);
1466 tmpbuf[namelen] = ':';
1467 tmpbuf[namelen+1] = ':';
1468 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1469 if (tmpbuf != smallbuf)
1470 Safefree(tmpbuf);
d2fcb1d6 1471 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1472 return NULL;
a0d0e21e 1473 stash = GvHV(tmpgv);
1f656fcf 1474 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1475 assert(stash);
1f656fcf 1476 if (!HvNAME_get(stash)) {
0be4d16f 1477 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1478
1479 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1480 /* If the containing stash has multiple effective
1481 names, see that this one gets them, too. */
1482 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1483 mro_package_moved(stash, NULL, tmpgv, 1);
1484 }
a0d0e21e 1485 return stash;
463ee0b2
LW
1486}
1487
808724c8 1488/*
1489gv_stashsvpvn_cached
1490
1491Returns a pointer to the stash for a specified package, possibly
48a81373 1492cached. Implements both C<gv_stashpvn> and C<gv_stashsv>.
808724c8 1493
1494Requires one of either namesv or namepv to be non-null.
1495
fbe13c60 1496See C<L</gv_stashpvn>> for details on "flags".
808724c8 1497
1498Note the sv interface is strongly preferred for performance reasons.
1499
1500*/
1501
1502#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1503 assert(namesv || name)
1504
1505PERL_STATIC_INLINE HV*
1506S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1507{
1508 HV* stash;
808724c8 1509 HE* he;
1510
1511 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1512
1513 he = (HE *)hv_common(
1514 PL_stashcache, namesv, name, namelen,
4e7ebec5 1515 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1516 );
808724c8 1517
78e4f28f
DM
1518 if (he) {
1519 SV *sv = HeVAL(he);
1520 HV *hv;
1521 assert(SvIOK(sv));
1522 hv = INT2PTR(HV*, SvIVX(sv));
1523 assert(SvTYPE(hv) == SVt_PVHV);
1524 return hv;
1525 }
d283e876 1526 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1527
808724c8 1528 if (namesv) {
1529 if (SvOK(namesv)) { /* prevent double uninit warning */
1530 STRLEN len;
1531 name = SvPV_const(namesv, len);
1532 namelen = len;
1533 flags |= SvUTF8(namesv);
1534 } else {
1535 name = ""; namelen = 0;
1536 }
1537 }
0eadbdad
YO
1538 stash = gv_stashpvn_internal(name, namelen, flags);
1539
4e7ebec5 1540 if (stash && namelen) {
1541 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1542 (void)hv_store(PL_stashcache, name,
4e7ebec5 1543 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1544 }
808724c8 1545
4e7ebec5 1546 return stash;
1547}
1548
808724c8 1549HV*
1550Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1551{
1552 PERL_ARGS_ASSERT_GV_STASHPVN;
1553 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1554}
1555
954c1994
GS
1556/*
1557=for apidoc gv_stashsv
1558
fbe13c60
KW
1559Returns a pointer to the stash for a specified package. See
1560C<L</gv_stashpvn>>.
954c1994 1561
fbe13c60
KW
1562Note this interface is strongly preferred over C<gv_stashpvn> for performance
1563reasons.
808724c8 1564
954c1994
GS
1565=cut
1566*/
1567
a0d0e21e 1568HV*
da51bb9b 1569Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1570{
7918f24d 1571 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1572 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW
1573}
1574
1575
463ee0b2 1576GV *
fe9845cc 1577Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1578 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1579 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1580}
1581
1582GV *
fe9845cc 1583Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1584 STRLEN len;
77cb3b01
FC
1585 const char * const nambeg =
1586 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1587 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1588 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1589}
1590
90aeefb4 1591PERL_STATIC_INLINE void
290a1700 1592S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1593{
1594 AV* av;
1595
1596 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1597
1598 av = GvAVn(gv);
1599 GvMULTI_on(gv);
1600 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1601 NULL, 0);
ad7cce9f
FR
1602}
1603
90aeefb4
BF
1604/* This function grabs name and tries to split a stash and glob
1605 * from its contents. TODO better description, comments
1606 *
1607 * If the function returns TRUE and 'name == name_end', then
1608 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1609 */
1610PERL_STATIC_INLINE bool
1611S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1612 STRLEN *len, const char *nambeg, STRLEN full_len,
1613 const U32 is_utf8, const I32 add)
1614{
8c573bee 1615 char *tmpfullbuf = NULL; /* only malloc one big chunk of memory when the smallbuff is not large enough */
90aeefb4
BF
1616 const char *name_cursor;
1617 const char *const name_end = nambeg + full_len;
1618 const char *const name_em1 = name_end - 1;
8c573bee 1619 char smallbuf[64]; /* small buffer to avoid a malloc when possible */
90aeefb4
BF
1620
1621 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1622
7a207065
KW
1623 if ( full_len > 2
1624 && **name == '*'
1625 && isIDFIRST_lazy_if_safe(*name + 1, name_end, is_utf8))
1626 {
90aeefb4
BF
1627 /* accidental stringify on a GV? */
1628 (*name)++;
1629 }
1630
1631 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1632 if (name_cursor < name_em1 &&
1633 ((*name_cursor == ':' && name_cursor[1] == ':')
1634 || *name_cursor == '\''))
1635 {
1636 if (!*stash)
1637 *stash = PL_defstash;
1638 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1639 return FALSE;
1640
1641 *len = name_cursor - *name;
1642 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1643 const char *key;
1644 GV**gvp;
1645 if (*name_cursor == ':') {
1646 key = *name;
1647 *len += 2;
1648 }
f8ac814f 1649 else { /* using ' for package separator */
8c573bee
N
1650 /* use our pre-allocated buffer when possible to save a malloc */
1651 char *tmpbuf;
1652 if ( *len+2 <= sizeof smallbuf)
1653 tmpbuf = smallbuf;
1654 else {
1655 /* only malloc once if needed */
1656 if (tmpfullbuf == NULL) /* only malloc&free once, a little more than needed */
1657 Newx(tmpfullbuf, full_len+2, char);
1658 tmpbuf = tmpfullbuf;
1659 }
90aeefb4
BF
1660 Copy(*name, tmpbuf, *len, char);
1661 tmpbuf[(*len)++] = ':';
1662 tmpbuf[(*len)++] = ':';
1663 key = tmpbuf;
1664 }
c161da64 1665 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4 1666 *gv = gvp ? *gvp : NULL;
f8ac814f 1667 if (!*gv || *gv == (const GV *)&PL_sv_undef) {
8c573bee 1668 Safefree(tmpfullbuf); /* free our tmpfullbuf if it was used */
90aeefb4 1669 return FALSE;
f8ac814f
N
1670 }
1671 /* here we know that *gv && *gv != &PL_sv_undef */
1672 if (SvTYPE(*gv) != SVt_PVGV)
1673 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1674 else
1675 GvMULTI_on(*gv);
90aeefb4
BF
1676
1677 if (!(*stash = GvHV(*gv))) {
1678 *stash = GvHV(*gv) = newHV();
1679 if (!HvNAME_get(*stash)) {
1680 if (GvSTASH(*gv) == PL_defstash && *len == 6
c8b388b0 1681 && strBEGINs(*name, "CORE"))
4c4f3c46 1682 hv_name_sets(*stash, "CORE", 0);
90aeefb4
BF
1683 else
1684 hv_name_set(
1685 *stash, nambeg, name_cursor-nambeg, is_utf8
1686 );
1687 /* If the containing stash has multiple effective
1688 names, see that this one gets them, too. */
1689 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1690 mro_package_moved(*stash, NULL, *gv, 1);
1691 }
1692 }
1693 else if (!HvNAME_get(*stash))
1694 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1695 }
1696
1697 if (*name_cursor == ':')
1698 name_cursor++;
1699 *name = name_cursor+1;
1700 if (*name == name_end) {
120921ac
Z
1701 if (!*gv) {
1702 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1703 if (SvTYPE(*gv) != SVt_PVGV) {
1704 gv_init_pvn(*gv, PL_defstash, "main::", 6,
1705 GV_ADDMULTI);
1706 GvHV(*gv) =
1707 MUTABLE_HV(SvREFCNT_inc_simple(PL_defstash));
1708 }
1709 }
8c573bee 1710 Safefree(tmpfullbuf); /* free our tmpfullbuf if it was used */
90aeefb4
BF
1711 return TRUE;
1712 }
1713 }
1714 }
1715 *len = name_cursor - *name;
1716 return TRUE;
1717}
1718
536d1a88 1719/* Checks if an unqualified name is in the main stash */
90aeefb4 1720PERL_STATIC_INLINE bool
536d1a88 1721S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1722{
536d1a88 1723 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1724
90aeefb4 1725 /* If it's an alphanumeric variable */
7a207065 1726 if ( len && isIDFIRST_lazy_if_safe(name, name + len, is_utf8) ) {
90aeefb4
BF
1727 /* Some "normal" variables are always in main::,
1728 * like INC or STDOUT.
1729 */
1730 switch (len) {
1731 case 1:
1732 if (*name == '_')
536d1a88 1733 return TRUE;
90aeefb4
BF
1734 break;
1735 case 3:
1736 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1737 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1738 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1739 return TRUE;
90aeefb4
BF
1740 break;
1741 case 4:
1742 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1743 && name[3] == 'V')
536d1a88 1744 return TRUE;
90aeefb4
BF
1745 break;
1746 case 5:
1747 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1748 && name[3] == 'I' && name[4] == 'N')
536d1a88 1749 return TRUE;
90aeefb4
BF
1750 break;
1751 case 6:
1752 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1753 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1754 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1755 return TRUE;
90aeefb4
BF
1756 break;
1757 case 7:
1758 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1759 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1760 && name[6] == 'T')
536d1a88 1761 return TRUE;
90aeefb4
BF
1762 break;
1763 }
536d1a88
BF
1764 }
1765 /* *{""}, or a special variable like $@ */
1766 else
1767 return TRUE;
1768
1769 return FALSE;
1770}
1771
1772
1773/* This function is called if parse_gv_stash_name() failed to
1774 * find a stash, or if GV_NOTQUAL or an empty name was passed
1775 * to gv_fetchpvn_flags.
1776 *
1777 * It returns FALSE if the default stash can't be found nor created,
1778 * which might happen during global destruction.
1779 */
1780PERL_STATIC_INLINE bool
1781S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1782 const U32 is_utf8, const I32 add,
1783 const svtype sv_type)
1784{
1785 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1786
1787 /* No stash in name, so see how we can default */
90aeefb4 1788
536d1a88
BF
1789 if ( gv_is_in_main(name, len, is_utf8) ) {
1790 *stash = PL_defstash;
1791 }
1792 else {
1793 if (IN_PERL_COMPILETIME) {
90aeefb4
BF
1794 *stash = PL_curstash;
1795 if (add && (PL_hints & HINT_STRICT_VARS) &&
1796 sv_type != SVt_PVCV &&
1797 sv_type != SVt_PVGV &&
1798 sv_type != SVt_PVFM &&
1799 sv_type != SVt_PVIO &&
1800 !(len == 1 && sv_type == SVt_PV &&
1801 (*name == 'a' || *name == 'b')) )
1802 {
c161da64 1803 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF
1804 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1805 SvTYPE(*gvp) != SVt_PVGV)
1806 {
1807 *stash = NULL;
1808 }
1809 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1810 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1811 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1812 {
1813 /* diag_listed_as: Variable "%s" is not imported%s */
1814 Perl_ck_warner_d(
1815 aTHX_ packWARN(WARN_MISC),
147e3846 1816 "Variable \"%c%" UTF8f "\" is not imported",
90aeefb4
BF
1817 sv_type == SVt_PVAV ? '@' :
1818 sv_type == SVt_PVHV ? '%' : '$',
1819 UTF8fARG(is_utf8, len, name));
1820 if (GvCVu(*gvp))
1821 Perl_ck_warner_d(
1822 aTHX_ packWARN(WARN_MISC),
147e3846 1823 "\t(Did you mean &%" UTF8f " instead?)\n",
90aeefb4
BF
1824 UTF8fARG(is_utf8, len, name)
1825 );
1826 *stash = NULL;
1827 }
1828 }
1829 }
1830 else {
1831 /* Use the current op's stash */
1832 *stash = CopSTASH(PL_curcop);
1833 }
1834 }
90aeefb4
BF
1835
1836 if (!*stash) {
1837 if (add && !PL_in_clean_all) {
10860bf4
FC
1838 GV *gv;
1839 qerror(Perl_mess(aTHX_
147e3846 1840 "Global symbol \"%s%" UTF8f
d8c6310a 1841 "\" requires explicit package name (did you forget to "
147e3846 1842 "declare \"my %s%" UTF8f "\"?)",
d8c6310a
FC
1843 (sv_type == SVt_PV ? "$"
1844 : sv_type == SVt_PVAV ? "@"
1845 : sv_type == SVt_PVHV ? "%"
1846 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF
1847 (sv_type == SVt_PV ? "$"
1848 : sv_type == SVt_PVAV ? "@"
1849 : sv_type == SVt_PVHV ? "%"
10860bf4 1850 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF
1851 /* To maintain the output of errors after the strict exception
1852 * above, and to keep compat with older releases, rather than
1853 * placing the variables in the pad, we place
1854 * them in the <none>:: stash.
1855 */
90aeefb4
BF
1856 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1857 if (!gv) {
1858 /* symbol table under destruction */
1859 return FALSE;
1860 }
1861 *stash = GvHV(gv);
1862 }
1863 else
1864 return FALSE;
1865 }
1866
1867 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1868 return FALSE;
1869
1870 return TRUE;
1871}
1872
8c995aba
FC
1873/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1874 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1875 this file. */
1876#undef SvREADONLY_on
1877#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1878
930867a8
BF
1879/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1880 * a new GV.
1881 * Note that it does not insert the GV into the stash prior to
1882 * magicalization, which some variables require need in order
c22e17d0 1883 * to work (like %+, %-, %!), so callers must take care of
1321bbe3 1884 * that.
930867a8 1885 *
1321bbe3
FC
1886 * It returns true if the gv did turn out to be magical one; i.e.,
1887 * if gv_magicalize actually did something.
930867a8
BF
1888 */
1889PERL_STATIC_INLINE bool
1890S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
1321bbe3 1891 const svtype sv_type)
79072805 1892{
960b831f 1893 SSize_t paren;
79072805 1894
930867a8 1895 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1896
44428a46 1897 if (stash != PL_defstash) { /* not the main stash */
ea238638 1898 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC
1899 and VERSION. All the others apply only to the main stash or to
1900 CORE (which is checked right after this). */
ea238638 1901 if (len) {
cc4c2da6 1902 switch (*name) {
cc4c2da6 1903 case 'E':
3092ee0c
YO
1904 if (
1905 len >= 6 && name[1] == 'X' &&
1906 (memEQs(name, len, "EXPORT")
eafd371c
YO
1907 ||memEQs(name, len, "EXPORT_OK")
1908 ||memEQs(name, len, "EXPORT_FAIL")
3092ee0c 1909 ||memEQs(name, len, "EXPORT_TAGS"))
eafd371c 1910 )
cc4c2da6
NC
1911 GvMULTI_on(gv);
1912 break;
1913 case 'I':
eafd371c 1914 if (memEQs(name, len, "ISA"))
290a1700 1915 gv_magicalize_isa(gv);
cc4c2da6 1916 break;
44428a46 1917 case 'V':
eafd371c 1918 if (memEQs(name, len, "VERSION"))
44428a46
FC
1919 GvMULTI_on(gv);
1920 break;
ea238638 1921 case 'a':
eafd371c 1922 if (stash == PL_debstash && memEQs(name, len, "args")) {
7bb33634
FC
1923 GvMULTI_on(gv_AVadd(gv));
1924 break;
eafd371c
YO
1925 }
1926 /* FALLTHROUGH */
ea238638
FC
1927 case 'b':
1928 if (len == 1 && sv_type == SVt_PV)
1929 GvMULTI_on(gv);
924ba076 1930 /* FALLTHROUGH */
4aaa4757
FC
1931 default:
1932 goto try_core;
1933 }
1321bbe3 1934 goto ret;
4aaa4757
FC
1935 }
1936 try_core:
1937 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1938 /* Avoid null warning: */
1939 const char * const stashname = HvNAME(stash); assert(stashname);
c8b388b0 1940 if (strBEGINs(stashname, "CORE"))
87566176 1941 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC
1942 }
1943 }
1944 else if (len > 1) {
1945#ifndef EBCDIC
1946 if (*name > 'V' ) {
1947 NOOP;
1948 /* Nothing else to do.
1949 The compiler will probably turn the switch statement into a
1950 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW
1951 the common case of lower case variable names. (On EBCDIC
1952 platforms, we can't just do:
1953 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1954 because cases like '\027' in the switch statement below are
1955 C1 (non-ASCII) controls on those platforms, so the remapping
1956 would make them larger than 'V')
1957 */
44428a46
FC
1958 } else
1959#endif
1960 {
44428a46
FC
1961 switch (*name) {
1962 case 'A':
eafd371c 1963 if (memEQs(name, len, "ARGV")) {
44428a46
FC
1964 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1965 }
eafd371c 1966 else if (memEQs(name, len, "ARGVOUT")) {
44428a46
FC
1967 GvMULTI_on(gv);
1968 }
1969 break;
1970 case 'E':
3092ee0c
YO
1971 if (
1972 len >= 6 && name[1] == 'X' &&
1973 (memEQs(name, len, "EXPORT")
055ae706
YO
1974 ||memEQs(name, len, "EXPORT_OK")
1975 ||memEQs(name, len, "EXPORT_FAIL")
3092ee0c 1976 ||memEQs(name, len, "EXPORT_TAGS"))
055ae706 1977 )
44428a46
FC
1978 GvMULTI_on(gv);
1979 break;
1980 case 'I':
eafd371c 1981 if (memEQs(name, len, "ISA")) {
290a1700 1982 gv_magicalize_isa(gv);
44428a46
FC
1983 }
1984 break;
cc4c2da6 1985 case 'S':
eafd371c 1986 if (memEQs(name, len, "SIG")) {
cc4c2da6
NC
1987 HV *hv;
1988 I32 i;
d525a7b2
NC
1989 if (!PL_psig_name) {
1990 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1991 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1992 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1993 } else {
1994 /* I think that the only way to get here is to re-use an
1995 embedded perl interpreter, where the previous
1996 use didn't clean up fully because
1997 PL_perl_destruct_level was 0. I'm not sure that we
1998 "support" that, in that I suspect in that scenario
1999 there are sufficient other garbage values left in the
2000 interpreter structure that something else will crash
2001 before we get here. I suspect that this is one of
2002 those "doctor, it hurts when I do this" bugs. */
d525a7b2 2003 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 2004 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
2005 }
2006 GvMULTI_on(gv);
2007 hv = GvHVn(gv);
a0714e2c 2008 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 2009 for (i = 1; i < SIG_SIZE; i++) {
551405c4 2010 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
2011 if (init)
2012 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
2013 }
2014 }
2015 break;
2016 case 'V':
eafd371c 2017 if (memEQs(name, len, "VERSION"))
cc4c2da6
NC
2018 GvMULTI_on(gv);
2019 break;
e5218da5 2020 case '\003': /* $^CHILD_ERROR_NATIVE */
eafd371c 2021 if (memEQs(name, len, "\003HILD_ERROR_NATIVE"))
e5218da5 2022 goto magicalize;
27deb0cf
YO
2023 /* @{^CAPTURE} %{^CAPTURE} */
2024 if (memEQs(name, len, "\003APTURE")) {
2025 AV* const av = GvAVn(gv);
fa531f32 2026 const Size_t n = *name;
27deb0cf 2027
fa531f32 2028 sv_magic(MUTABLE_SV(av), (SV*)n, PERL_MAGIC_regdata, NULL, 0);
27deb0cf
YO
2029 SvREADONLY_on(av);
2030
2031 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
2032 require_tie_mod_s(gv, '-', "Tie::Hash::NamedCapture",0);
2033
2034 } else /* %{^CAPTURE_ALL} */
2035 if (memEQs(name, len, "\003APTURE_ALL")) {
2036 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
2037 require_tie_mod_s(gv, '+', "Tie::Hash::NamedCapture",0);
2038 }
e5218da5 2039 break;
cc4c2da6 2040 case '\005': /* $^ENCODING */
eafd371c 2041 if (memEQs(name, len, "\005NCODING"))
cc4c2da6
NC
2042 goto magicalize;
2043 break;
9ebf26ad 2044 case '\007': /* $^GLOBAL_PHASE */
eafd371c 2045 if (memEQs(name, len, "\007LOBAL_PHASE"))
9ebf26ad
FR
2046 goto ro_magicalize;
2047 break;
8561ea1d 2048 case '\014': /* $^LAST_FH */
eafd371c 2049 if (memEQs(name, len, "\014AST_FH"))
8561ea1d
FC
2050 goto ro_magicalize;
2051 break;
cde0cee5 2052 case '\015': /* $^MATCH */
eafd371c 2053 if (memEQs(name, len, "\015ATCH")) {
960b831f
NC
2054 paren = RX_BUFF_IDX_CARET_FULLMATCH;
2055 goto storeparen;
2056 }
66230c86 2057 break;
cc4c2da6 2058 case '\017': /* $^OPEN */
eafd371c 2059 if (memEQs(name, len, "\017PEN"))
cc4c2da6
NC
2060 goto magicalize;
2061 break;
cde0cee5 2062 case '\020': /* $^PREMATCH $^POSTMATCH */
eafd371c 2063 if (memEQs(name, len, "\020REMATCH")) {
960b831f
NC
2064 paren = RX_BUFF_IDX_CARET_PREMATCH;
2065 goto storeparen;
2066 }
eafd371c 2067 if (memEQs(name, len, "\020OSTMATCH")) {
960b831f
NC
2068 paren = RX_BUFF_IDX_CARET_POSTMATCH;
2069 goto storeparen;
2070 }
9ebf26ad 2071 break;
f512d242
KW
2072 case '\023':
2073 if (memEQs(name, len, "\023AFE_LOCALES"))
2074 goto ro_magicalize;
2075 break;
cc4c2da6 2076 case '\024': /* ${^TAINT} */
eafd371c 2077 if (memEQs(name, len, "\024AINT"))
cc4c2da6
NC
2078 goto ro_magicalize;
2079 break;
7cebcbc0 2080 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
eafd371c 2081 if (memEQs(name, len, "\025NICODE"))
cc4c2da6 2082 goto ro_magicalize;
eafd371c 2083 if (memEQs(name, len, "\025TF8LOCALE"))
7cebcbc0 2084 goto ro_magicalize;
eafd371c 2085 if (memEQs(name, len, "\025TF8CACHE"))
e07ea26a 2086 goto magicalize;
cc4c2da6
NC
2087 break;
2088 case '\027': /* $^WARNING_BITS */
eafd371c 2089 if (memEQs(name, len, "\027ARNING_BITS"))
cc4c2da6 2090 goto magicalize;
8ca2a5d6 2091#ifdef WIN32
eafd371c 2092 else if (memEQs(name, len, "\027IN32_SLOPPY_STAT"))
8ca2a5d6
DD
2093 goto magicalize;
2094#endif
cc4c2da6
NC
2095 break;
2096 case '1':
2097 case '2':
2098 case '3':
2099 case '4':
2100 case '5':
2101 case '6':
2102 case '7':
2103 case '8':
2104 case '9':
85e6fe83 2105 {
2fdbfb4d
AB
2106 /* Ensures that we have an all-digit variable, ${"1foo"} fails
2107 this test */
22ff3130
HS
2108 UV uv;
2109 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1321bbe3 2110 goto ret;
22ff3130
HS
2111 /* XXX why are we using a SSize_t? */
2112 paren = (SSize_t)(I32)uv;
960b831f 2113 goto storeparen;
1d7c1841 2114 }
dc437b57 2115 }
93a17b20 2116 }
392db708
NC
2117 } else {
2118 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2119 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2120 switch (*name) {
6361f656 2121 case '&': /* $& */
960b831f
NC
2122 paren = RX_BUFF_IDX_FULLMATCH;
2123 goto sawampersand;
6361f656 2124 case '`': /* $` */
960b831f
NC
2125 paren = RX_BUFF_IDX_PREMATCH;
2126 goto sawampersand;
6361f656 2127 case '\'': /* $' */
960b831f
NC
2128 paren = RX_BUFF_IDX_POSTMATCH;
2129 sawampersand:
1a904fc8 2130#ifdef PERL_SAWAMPERSAND
a289ef89 2131 if (!(
cc4c2da6
NC
2132 sv_type == SVt_PVAV ||
2133 sv_type == SVt_PVHV ||
2134 sv_type == SVt_PVCV ||
2135 sv_type == SVt_PVFM ||
2136 sv_type == SVt_PVIO
d3b97530
DM
2137 )) { PL_sawampersand |=
2138 (*name == '`')
2139 ? SAWAMPERSAND_LEFT
2140 : (*name == '&')
2141 ? SAWAMPERSAND_MIDDLE
2142 : SAWAMPERSAND_RIGHT;
2143 }
1a904fc8 2144#endif
960b831f 2145 goto storeparen;
e91d8259
NC
2146 case '1': /* $1 */
2147 case '2': /* $2 */
2148 case '3': /* $3 */
2149 case '4': /* $4 */
2150 case '5': /* $5 */
2151 case '6': /* $6 */
2152 case '7': /* $7 */
2153 case '8': /* $8 */
2154 case '9': /* $9 */
960b831f
NC
2155 paren = *name - '0';
2156
2157 storeparen:
e91d8259
NC
2158 /* Flag the capture variables with a NULL mg_ptr
2159 Use mg_len for the array index to lookup. */
960b831f 2160 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2161 break;
cc4c2da6 2162
6361f656 2163 case ':': /* $: */
c69033f2 2164 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
2165 goto magicalize;
2166
6361f656 2167 case '?': /* $? */
ff0cee69 2168#ifdef COMPLEX_STATUS
c69033f2 2169 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2170#endif
cc4c2da6 2171 goto magicalize;
ff0cee69 2172
6361f656 2173 case '!': /* $! */
67261566 2174 GvMULTI_on(gv);
44a2ac75 2175 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2176
ad64d0ec 2177 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2178
7c719134 2179 /* magicalization must be done before require_tie_mod_s is called */
67261566 2180 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
7c719134 2181 require_tie_mod_s(gv, '!', "Errno", 1);
d2c93421 2182
6cef1e77 2183 break;
754f85ad
YO
2184 case '-': /* $-, %-, @- */
2185 case '+': /* $+, %+, @+ */
27deb0cf
YO
2186 GvMULTI_on(gv); /* no used once warnings here */
2187 { /* $- $+ */
2188 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
2189 if (*name == '+')
2190 SvREADONLY_on(GvSVn(gv));
2191 }
2192 { /* %- %+ */
2193 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
2194 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture",0);
2195 }
2196 { /* @- @+ */
2197 AV* const av = GvAVn(gv);
fa531f32 2198 const Size_t n = *name;
67261566 2199
fa531f32 2200 sv_magic(MUTABLE_SV(av), (SV*)n, PERL_MAGIC_regdata, NULL, 0);
27deb0cf
YO
2201 SvREADONLY_on(av);
2202 }
80305961 2203 break;
a678626e
A
2204 case '*': /* $* */
2205 case '#': /* $# */
dcb414ac
JK
2206 if (sv_type == SVt_PV)
2207 /* diag_listed_as: $* is no longer supported as of Perl 5.30 */
2208 Perl_croak(aTHX_ "$%c is no longer supported as of Perl 5.30", *name);
2209 break;
b3ca2e83
NC
2210 case '\010': /* $^H */
2211 {
2212 HV *const hv = GvHVn(gv);
2213 hv_magic(hv, NULL, PERL_MAGIC_hints);
2214 }
2215 goto magicalize;
cc4c2da6 2216 case '\023': /* $^S */
2fdbfb4d
AB
2217 ro_magicalize:
2218 SvREADONLY_on(GvSVn(gv));
924ba076 2219 /* FALLTHROUGH */
6361f656 2220 case '0': /* $0 */
6361f656
AB
2221 case '^': /* $^ */
2222 case '~': /* $~ */
2223 case '=': /* $= */
2224 case '%': /* $% */
2225 case '.': /* $. */
2226 case '(': /* $( */
2227 case ')': /* $) */
2228 case '<': /* $< */
2229 case '>': /* $> */
2230 case '\\': /* $\ */
2231 case '/': /* $/ */
4505a31f 2232 case '|': /* $| */
9cdac2a2 2233 case '$': /* $$ */
c22e17d0 2234 case '[': /* $[ */
cc4c2da6
NC
2235 case '\001': /* $^A */
2236 case '\003': /* $^C */
2237 case '\004': /* $^D */
2238 case '\005': /* $^E */
2239 case '\006': /* $^F */
cc4c2da6
NC
2240 case '\011': /* $^I, NOT \t in EBCDIC */
2241 case '\016': /* $^N */
2242 case '\017': /* $^O */
2243 case '\020': /* $^P */
2244 case '\024': /* $^T */
2245 case '\027': /* $^W */
2246 magicalize:
ad64d0ec 2247 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2248 break;
e521374c 2249
cc4c2da6 2250 case '\014': /* $^L */
76f68e9b 2251 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2252 break;
6361f656 2253 case ';': /* $; */
76f68e9b 2254 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2255 break;
6361f656 2256 case ']': /* $] */
cc4c2da6 2257 {
3638bf15 2258 SV * const sv = GvSV(gv);
d7aa5382 2259 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2260 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
2261 GvSV(gv) = vnumify(PL_patchlevel);
2262 SvREADONLY_on(GvSV(gv));
2263 SvREFCNT_dec(sv);
93a17b20
LW
2264 }
2265 break;
cc4c2da6
NC
2266 case '\026': /* $^V */
2267 {
3638bf15 2268 SV * const sv = GvSV(gv);
f9be5ac8
DM
2269 GvSV(gv) = new_version(PL_patchlevel);
2270 SvREADONLY_on(GvSV(gv));
2271 SvREFCNT_dec(sv);
16070b82
GS
2272 }
2273 break;
ea238638
FC
2274 case 'a':
2275 case 'b':
dc3e91f6 2276 if (sv_type == SVt_PV)
ea238638 2277 GvMULTI_on(gv);
cc4c2da6 2278 }
79072805 2279 }
930867a8 2280
1321bbe3
FC
2281 ret:
2282 /* Return true if we actually did something. */
2283 return GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv)
2284 || ( GvSV(gv) && (
2285 SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv))
2286 )
2287 );
71c35c05
BF
2288}
2289
8c995aba
FC
2290/* If we do ever start using this later on in the file, we need to make
2291 sure we don’t accidentally use the wrong definition. */
2292#undef SvREADONLY_on
2293
070dc475
BF
2294/* This function is called when the stash already holds the GV of the magic
2295 * variable we're looking for, but we need to check that it has the correct
2296 * kind of magic. For example, if someone first uses $! and then %!, the
2297 * latter would end up here, and we add the Errno tie to the HASH slot of
2298 * the *! glob.
2299 */
2300PERL_STATIC_INLINE void
2301S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2302{
2303 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2304
2305 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2306 if (*name == '!')
7c719134 2307 require_tie_mod_s(gv, '!', "Errno", 1);
070dc475 2308 else if (*name == '-' || *name == '+')
7c719134 2309 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture", 0);
a678626e
A
2310 } else if (sv_type == SVt_PV) {
2311 if (*name == '*' || *name == '#') {
dcb414ac
JK
2312 /* diag_listed_as: $* is no longer supported as of Perl 5.30 */
2313 Perl_croak(aTHX_ "$%c is no longer supported as of Perl 5.30", *name);
a678626e 2314 }
070dc475
BF
2315 }
2316 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2317 switch (*name) {
070dc475
BF
2318#ifdef PERL_SAWAMPERSAND
2319 case '`':
2320 PL_sawampersand |= SAWAMPERSAND_LEFT;
2321 (void)GvSVn(gv);
2322 break;
2323 case '&':
2324 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2325 (void)GvSVn(gv);
2326 break;
2327 case '\'':
2328 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2329 (void)GvSVn(gv);
2330 break;
2331#endif
2332 }
2333 }
2334}
2335
71c35c05
BF
2336GV *
2337Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2338 const svtype sv_type)
2339{
71c35c05
BF
2340 const char *name = nambeg;
2341 GV *gv = NULL;
2342 GV**gvp;
2343 STRLEN len;
2344 HV *stash = NULL;
2345 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2346 const I32 no_expand = flags & GV_NOEXPAND;
2347 const I32 add = flags & ~GV_NOADD_MASK;
2348 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2349 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF
2350 const char *const name_end = nambeg + full_len;
2351 U32 faking_it;
2352
2353 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2354
2355 /* If we have GV_NOTQUAL, the caller promised that
2356 * there is no stash, so we can skip the check.
2357 * Similarly if full_len is 0, since then we're
2358 * dealing with something like *{""} or ""->foo()
2359 */
2360 if ((flags & GV_NOTQUAL) || !full_len) {
2361 len = full_len;
2362 }
2363 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2364 if (name == name_end) return gv;
2365 }
2366 else {
2367 return NULL;
2368 }
2369
2370 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2371 return NULL;
2372 }
2373
2374 /* By this point we should have a stash and a name */
c161da64 2375 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF
2376 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2377 if (addmg) gv = (GV *)newSV(0);
2378 else return NULL;
2379 }
2380 else gv = *gvp, addmg = 0;
2381 /* From this point on, addmg means gv has not been inserted in the
2382 symtab yet. */
2383
2384 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF
2385 /* The GV already exists, so return it, but check if we need to do
2386 * anything else with it before that.
2387 */
71c35c05 2388 if (add) {
c002ae9a
BF
2389 /* This is the heuristic that handles if a variable triggers the
2390 * 'used only once' warning. If there's already a GV in the stash
2391 * with this name, then we assume that the variable has been used
2392 * before and turn its MULTI flag on.
2393 * It's a heuristic because it can easily be "tricked", like with
2394 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2395 * not warning about $main::foo being used just once
2396 */
71c35c05
BF
2397 GvMULTI_on(gv);
2398 gv_init_svtype(gv, sv_type);
2399 /* You reach this path once the typeglob has already been created,
2400 either by the same or a different sigil. If this path didn't
2401 exist, then (say) referencing $! first, and %! second would
2402 mean that %! was not handled correctly. */
2403 if (len == 1 && stash == PL_defstash) {
070dc475 2404 maybe_multimagic_gv(gv, name, sv_type);
71c35c05 2405 }
b59bf0b2
KW
2406 else if (sv_type == SVt_PVAV
2407 && memEQs(name, len, "ISA")
71c35c05
BF
2408 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2409 gv_magicalize_isa(gv);
2410 }
2411 return gv;
2412 } else if (no_init) {
2413 assert(!addmg);
2414 return gv;
c002ae9a
BF
2415 }
2416 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2417 * don't expand it to a glob. This is an optimization so that things
2418 * copying constants over, like Exporter, don't have to be rewritten
2419 * to take into account that you can store more than just globs in
2420 * stashes.
2421 */
2422 else if (no_expand && SvROK(gv)) {
71c35c05
BF
2423 assert(!addmg);
2424 return gv;
2425 }
2426
2427 /* Adding a new symbol.
2428 Unless of course there was already something non-GV here, in which case
2429 we want to behave as if there was always a GV here, containing some sort
2430 of subroutine.
2431 Otherwise we run the risk of creating things like GvIO, which can cause
2432 subtle bugs. eg the one that tripped up SQL::Translator */
2433
2434 faking_it = SvOK(gv);
2435
2436 if (add & GV_ADDWARN)
2437 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
147e3846 2438 "Had to create %" UTF8f " unexpectedly",
71c35c05
BF
2439 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2440 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2441
7a207065
KW
2442 if ( full_len != 0
2443 && isIDFIRST_lazy_if_safe(name, name + full_len, is_utf8)
2444 && !ckWARN(WARN_ONCE) )
2445 {
71c35c05 2446 GvMULTI_on(gv) ;
7a207065 2447 }
71c35c05
BF
2448
2449 /* set up magic where warranted */
1321bbe3 2450 if ( gv_magicalize(gv, stash, name, len, sv_type) ) {
930867a8 2451 /* See 23496c6 */
1321bbe3
FC
2452 if (addmg) {
2453 /* gv_magicalize magicalised this gv, so we want it
930867a8 2454 * stored in the symtab.
1321bbe3
FC
2455 * Effectively the caller is asking, ‘Does this gv exist?’
2456 * And we respond, ‘Er, *now* it does!’
930867a8
BF
2457 */
2458 (void)hv_store(stash,name,len,(SV *)gv,0);
1321bbe3
FC
2459 }
2460 }
2461 else if (addmg) {
2462 /* The temporary GV created above */
930867a8
BF
2463 SvREFCNT_dec_NN(gv);
2464 gv = NULL;
930867a8 2465 }
71c35c05 2466
e6066781 2467 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2468 return gv;
79072805
LW
2469}
2470
2471void
35a4481c 2472Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2473{
ed60a868 2474 const char *name;
35a4481c 2475 const HV * const hv = GvSTASH(gv);
7918f24d
NC
2476
2477 PERL_ARGS_ASSERT_GV_FULLNAME4;
2478
666ea192 2479 sv_setpv(sv, prefix ? prefix : "");
a0288114 2480
52a6327b 2481 if (hv && (name = HvNAME(hv))) {
ed60a868 2482 const STRLEN len = HvNAMELEN(hv);
61e2287f 2483 if (keepmain || ! memBEGINs(name, len, "main")) {
ed60a868 2484 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2485 sv_catpvs(sv,"::");
ed60a868 2486 }
43693395 2487 }
ed60a868 2488 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2489 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2490}
2491
2492void
35a4481c 2493Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2494{
099be4f1 2495 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2496
2497 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2498
46c461b5 2499 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2500}
2501
39a65960
DM
2502
2503/* recursively scan a stash and any nested stashes looking for entries
2504 * that need the "only used once" warning raised
2505 */
2506
79072805 2507void
51da40ed 2508Perl_gv_check(pTHX_ HV *stash)
79072805 2509{
eb578fdb 2510 I32 i;
463ee0b2 2511
7918f24d
NC
2512 PERL_ARGS_ASSERT_GV_CHECK;
2513
9e5cda6b 2514 if (!SvOOK(stash))
8990e307 2515 return;
90754377 2516
9e5cda6b 2517 assert(HvARRAY(stash));
90754377 2518
a0d0e21e 2519 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2520 const HE *entry;
90754377 2521 /* mark stash is being scanned, to avoid recursing */
339441ef 2522 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2523 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2524 GV *gv;
b7787f18 2525 HV *hv;
e7acdfe9
DM
2526 STRLEN keylen = HeKLEN(entry);
2527 const char * const key = HeKEY(entry);
2528
2529 if (keylen >= 2 && key[keylen-2] == ':' && key[keylen-1] == ':' &&
159b6efe 2530 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2531 {
90754377
DM
2532 if (hv != PL_defstash && hv != stash
2533 && !(SvOOK(hv)
2534 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2535 )
a0d0e21e
LW
2536 gv_check(hv); /* nested package */
2537 }
7a207065
KW
2538 else if ( HeKLEN(entry) != 0
2539 && *HeKEY(entry) != '_'
2540 && isIDFIRST_lazy_if_safe(HeKEY(entry),
2541 HeKEY(entry) + HeKLEN(entry),
2542 HeUTF8(entry)) )
2543 {
e1ec3a88 2544 const char *file;
159b6efe 2545 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2546 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2547 continue;
1d7c1841 2548 file = GvFILE(gv);
1d7c1841 2549 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC
2550#ifdef USE_ITHREADS
2551 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2552#else
2553 CopFILEGV(PL_curcop)
2554 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2555#endif
9014280d 2556 Perl_warner(aTHX_ packWARN(WARN_ONCE),
147e3846 2557 "Name \"%" HEKf "::%" HEKf
d0c0e7dd
FC
2558 "\" used only once: possible typo",
2559 HEKfARG(HvNAME_HEK(stash)),
2560 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2561 }
79072805 2562 }
339441ef 2563 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW
2564 }
2565}
2566
2567GV *
9cc50d5b 2568Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2569{
9cc50d5b 2570 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2571 assert(!(flags & ~SVf_UTF8));
7918f24d 2572
147e3846 2573 return gv_fetchpv(Perl_form(aTHX_ "%" UTF8f "::_GEN_%ld",
b17a0679 2574 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF
2575 (long)PL_gensym++),
2576 GV_ADD, SVt_PVGV);
79072805
LW
2577}
2578
2579/* hopefully this is only called on local symbol table entries */
2580
2581GP*
864dbfa3 2582Perl_gp_ref(pTHX_ GP *gp)
79072805 2583{
1d7c1841 2584 if (!gp)
d4c19fe8 2585 return NULL;
79072805 2586 gp->gp_refcnt++;
44a8e56a
PP
2587 if (gp->gp_cv) {
2588 if (gp->gp_cvgen) {
e1a479c5
BB
2589 /* If the GP they asked for a reference to contains
2590 a method cache entry, clear it first, so that we
2591 don't infect them with our cached entry */
e7881358 2592 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2593 gp->gp_cv = NULL;
44a8e56a
PP
2594 gp->gp_cvgen = 0;
2595 }
44a8e56a 2596 }
79072805 2597 return gp;
79072805
LW
2598}
2599
2600void
864dbfa3 2601Perl_gp_free(pTHX_ GV *gv)
79072805 2602{
79072805 2603 GP* gp;
b0d55c99 2604 int attempts = 100;
79072805 2605
f7877b28 2606 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2607 return;
f248d071 2608 if (gp->gp_refcnt == 0) {
9b387841
NC
2609 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2610 "Attempt to free unreferenced glob pointers"
2611 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2612 return;
2613 }
4571f4a7 2614 if (gp->gp_refcnt > 1) {
bc81b34d 2615 borrowed:
748a9306
LW
2616 if (gp->gp_egv == gv)
2617 gp->gp_egv = 0;
4571f4a7 2618 gp->gp_refcnt--;
c43ae56f 2619 GvGP_set(gv, NULL);
79072805 2620 return;
748a9306 2621 }
79072805 2622
b0d55c99
FC
2623 while (1) {
2624 /* Copy and null out all the glob slots, so destructors do not see
2625 freed SVs. */
2626 HEK * const file_hek = gp->gp_file_hek;
2627 SV * const sv = gp->gp_sv;
2628 AV * const av = gp->gp_av;
2629 HV * const hv = gp->gp_hv;
2630 IO * const io = gp->gp_io;
2631 CV * const cv = gp->gp_cv;
2632 CV * const form = gp->gp_form;
2633
2634 gp->gp_file_hek = NULL;
2635 gp->gp_sv = NULL;
2636 gp->gp_av = NULL;
2637 gp->gp_hv = NULL;
2638 gp->gp_io = NULL;
2639 gp->gp_cv = NULL;
2640 gp->gp_form = NULL;
2641
2642 if (file_hek)
2643 unshare_hek(file_hek);
2644
2645 SvREFCNT_dec(sv);
2646 SvREFCNT_dec(av);
2647 /* FIXME - another reference loop GV -> symtab -> GV ?
2648 Somehow gp->gp_hv can end up pointing at freed garbage. */
2649 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2650 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC
2651 if (PL_stashcache && hvname_hek) {
2652 DEBUG_o(Perl_deb(aTHX_
147e3846 2653 "gp_free clearing PL_stashcache for '%" HEKf "'\n",
923ed580 2654 HEKfARG(hvname_hek)));
0ca9877d 2655 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2656 }
b0d55c99
FC
2657 SvREFCNT_dec(hv);
2658 }
96d7c888
FC
2659 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2660 && (IoTYPE(io) == IoTYPE_WRONLY ||
2661 IoTYPE(io) == IoTYPE_RDWR ||
2662 IoTYPE(io) == IoTYPE_APPEND)
2663 && ckWARN_d(WARN_IO)
2664 && IoIFP(io) != PerlIO_stdin()
2665 && IoIFP(io) != PerlIO_stdout()
2666 && IoIFP(io) != PerlIO_stderr()
2667 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2668 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC
2669 SvREFCNT_dec(io);
2670 SvREFCNT_dec(cv);
2671 SvREFCNT_dec(form);
2672
bc81b34d
FC
2673 /* Possibly reallocated by a destructor */
2674 gp = GvGP(gv);
2675
b0d55c99
FC
2676 if (!gp->gp_file_hek
2677 && !gp->gp_sv
2678 && !gp->gp_av
2679 && !gp->gp_hv
2680 && !gp->gp_io
2681 && !gp->gp_cv
2682 && !gp->gp_form) break;
2683
2684 if (--attempts == 0) {
2685 Perl_die(aTHX_
2686 "panic: gp_free failed to free glob pointer - "
2687 "something is repeatedly re-creating entries"
2688 );
2689 }
13207a71 2690 }
748a9306 2691
bc81b34d
FC
2692 /* Possibly incremented by a destructor doing glob assignment */
2693 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2694 Safefree(gp);
c43ae56f 2695 GvGP_set(gv, NULL);
79072805
LW
2696}
2697
d460ef45
NIS
2698int
2699Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2700{
53c1dcc0
AL
2701 AMT * const amtp = (AMT*)mg->mg_ptr;
2702 PERL_UNUSED_ARG(sv);
dd374669 2703
7918f24d
NC
2704 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2705
d460ef45
NIS
2706 if (amtp && AMT_AMAGIC(amtp)) {
2707 int i;
2708 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2709 CV * const cv = amtp->table[i];
b37c2d43 2710 if (cv) {
e7881358 2711 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2712 amtp->table[i] = NULL;
d460ef45
NIS
2713 }
2714 }
2715 }
2716 return 0;
2717}
2718
a0d0e21e 2719/* Updates and caches the CV's */
c3a9a790
RGS
2720/* Returns:
2721 * 1 on success and there is some overload
2722 * 0 if there is no overload
2723 * -1 if some error occurred and it couldn't croak
2724 */
a0d0e21e 2725
c3a9a790 2726int
242f8760 2727Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2728{
ad64d0ec 2729 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2730 AMT amt;
9b439311 2731 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2732 U32 newgen;
a0d0e21e 2733
7918f24d
NC
2734 PERL_ARGS_ASSERT_GV_AMUPDATE;
2735
9b439311 2736 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2737 if (mg) {
2738 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2739 if (amtp->was_ok_sub == newgen) {
8c34e50d 2740 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2741 }
ad64d0ec 2742 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2743 }
a0d0e21e 2744
bfcb3514 2745 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2746
d460ef45 2747 Zero(&amt,1,AMT);
e1a479c5 2748 amt.was_ok_sub = newgen;
a6006777
PP
2749 amt.fallback = AMGfallNO;
2750 amt.flags = 0;
2751
a6006777 2752 {
8c34e50d
FC
2753 int filled = 0;
2754 int i;
3d147ac2
DM
2755 bool deref_seen = 0;
2756
a6006777 2757
3866ea3b 2758 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2759
89ffc314 2760 /* Try to find via inheritance. */
e6919483 2761 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2762 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2763 CV* cv;
89ffc314
IZ
2764
2765 if (!gv)
3866ea3b
FC
2766 {
2767 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2768 goto no_table;
3866ea3b
FC
2769 }
2770#ifdef PERL_DONT_CREATE_GVSV
2771 else if (!sv) {
6f207bd3 2772 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC
2773 }
2774#endif
79c9643d
JL
2775 else if (SvTRUE(sv))
2776 /* don't need to set overloading here because fallback => 1
2777 * is the default setting for classes without overloading */
89ffc314 2778 amt.fallback=AMGfallYES;
79c9643d
JL
2779 else if (SvOK(sv)) {
2780 amt.fallback=AMGfallNEVER;
386a5489 2781 filled = 1;
386a5489 2782 }
79c9643d 2783 else {
386a5489 2784 filled = 1;
386a5489 2785 }
a6006777 2786
3d147ac2 2787 assert(SvOOK(stash));
3d147ac2 2788 /* initially assume the worst */
339441ef 2789 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2790
8c34e50d 2791 for (i = 1; i < NofAMmeth; i++) {
6136c704 2792 const char * const cooky = PL_AMG_names[i];
32251b26 2793 /* Human-readable form, for debugging: */
8c34e50d 2794 const char * const cp = AMG_id2name(i);
d279ab82 2795 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2796
a0288114 2797 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2798 cp, HvNAME_get(stash)) );
611c1e95
IZ
2799 /* don't fill the cache while looking up!
2800 Creation of inheritance stubs in intermediate packages may
2801 conflict with the logic of runtime method substitution.
2802 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2803 then we could have created stubs for "(+0" in A and C too.
2804 But if B overloads "bool", we may want to use it for
2805 numifying instead of C's "+0". */
8c34e50d 2806 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2807 cv = 0;
c3ad4e54 2808 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
79656330 2809 const HEK * const gvhek = CvGvNAME_HEK(cv);
c3ad4e54
FC
2810 const HEK * const stashek =
2811 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
b59bf0b2
KW
2812 if (memEQs(HEK_KEY(gvhek), HEK_LEN(gvhek), "nil")
2813 && stashek
2814 && memEQs(HEK_KEY(stashek), HEK_LEN(stashek), "overload")) {
611c1e95
IZ
2815 /* This is a hack to support autoloading..., while
2816 knowing *which* methods were declared as overloaded. */
44a8e56a 2817 /* GvSV contains the name of the method. */
6136c704 2818 GV *ngv = NULL;
c69033f2 2819 SV *gvsv = GvSV(gv);
a0288114 2820
147e3846 2821 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%" SVf256\
a0288114 2822 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2823 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2824 if (!gvsv || !SvPOK(gvsv)
7f415459 2825 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2826 {
a0288114 2827 /* Can be an import stub (created by "can"). */
242f8760 2828 if (destructing) {
c3a9a790 2829 return -1;
242f8760
RGS
2830 }
2831 else {
d66cca07
BF
2832 const SV * const name = (gvsv && SvPOK(gvsv))
2833 ? gvsv
2834 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2835 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
147e3846 2836 Perl_croak(aTHX_ "%s method \"%" SVf256
d66cca07 2837 "\" overloading \"%s\" "\
147e3846 2838 "in package \"%" HEKf256 "\"",
242f8760
RGS
2839 (GvCVGEN(gv) ? "Stub found while resolving"
2840 : "Can't resolve"),
d66cca07 2841 SVfARG(name), cp,
d0c0e7dd 2842 HEKfARG(
d66cca07 2843 HvNAME_HEK(stash)
d0c0e7dd 2844 ));
242f8760 2845 }
44a8e56a 2846 }
dc848c6f 2847 cv = GvCV(gv = ngv);
44a8e56a 2848 }
b464bac0 2849 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2850 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2851 GvNAME(CvGV(cv))) );
2852 filled = 1;
611c1e95 2853 } else if (gv) { /* Autoloaded... */
ea726b52 2854 cv = MUTABLE_CV(gv);
611c1e95 2855 filled = 1;
44a8e56a 2856 }
ea726b52 2857 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM
2858
2859 if (gv) {
2860 switch (i) {
2861 case to_sv_amg:
2862 case to_av_amg:
2863 case to_hv_amg:
2864 case to_gv_amg:
2865 case to_cv_amg:
2866 case nomethod_amg:
2867 deref_seen = 1;
2868 break;
2869 }
2870 }
a0d0e21e 2871 }
3d147ac2 2872 if (!deref_seen)
45479970
DM
2873 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2874 * NB - aux var invalid here, HvARRAY() could have been
2875 * reallocated since it was assigned to */
2876 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2877
a0d0e21e 2878 if (filled) {
a6006777 2879 AMT_AMAGIC_on(&amt);
ad64d0ec 2880 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2881 (char*)&amt, sizeof(AMT));
8c34e50d 2882 return TRUE;
a0d0e21e
LW
2883 }
2884 }
a6006777 2885 /* Here we have no table: */
8c34e50d 2886 no_table:
a6006777 2887 AMT_AMAGIC_off(&amt);
ad64d0ec 2888 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2889 (char*)&amt, sizeof(AMTS));
c3a9a790 2890 return 0;
a0d0e21e
LW
2891}
2892
32251b26
IZ
2893
2894CV*
2895Perl_gv_handler(pTHX_ HV *stash, I32 id)
2896{
3f8f4626 2897 MAGIC *mg;
32251b26 2898 AMT *amtp;
e1a479c5 2899 U32 newgen;
9b439311 2900 struct mro_meta* stash_meta;
32251b26 2901
bfcb3514 2902 if (!stash || !HvNAME_get(stash))
601f1833 2903 return NULL;
e1a479c5 2904
9b439311
BB
2905 stash_meta = HvMROMETA(stash);
2906 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2907
ad64d0ec 2908 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2909 if (!mg) {
2910 do_update:
8c34e50d 2911 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2912 return NULL;
ad64d0ec 2913 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2914 }
a9fd4e40 2915 assert(mg);
32251b26 2916 amtp = (AMT*)mg->mg_ptr;
66978156 2917 if ( amtp->was_ok_sub != newgen )
32251b26 2918 goto do_update;
3ad83ce7 2919 if (AMT_AMAGIC(amtp)) {
b7787f18 2920 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2921 if (ret && isGV(ret)) { /* Autoloading stab */
2922 /* Passing it through may have resulted in a warning
2923 "Inherited AUTOLOAD for a non-method deprecated", since
2924 our caller is going through a function call, not a method call.
2925 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2926 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2927
2928 if (gv && GvCV(gv))
2929 return GvCV(gv);
2930 }
2931 return ret;
2932 }
a0288114 2933
601f1833 2934 return NULL;
32251b26
IZ
2935}
2936
2937
6f1401dc
DM
2938/* Implement tryAMAGICun_MG macro.
2939 Do get magic, then see if the stack arg is overloaded and if so call it.
2940 Flags:
2941 AMGf_set return the arg using SETs rather than assigning to
2942 the targ
2943 AMGf_numeric apply sv_2num to the stack arg.
2944*/
2945
2946bool
2947Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM
2948 dSP;
2949 SV* tmpsv;
2950 SV* const arg = TOPs;
2951
2952 SvGETMAGIC(arg);
2953
9f8bf298 2954 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC
2955 AMGf_noright | AMGf_unary
2956 | (flags & AMGf_numarg))))
2957 {
6f1401dc
DM
2958 if (flags & AMGf_set) {
2959 SETs(tmpsv);
2960 }
2961 else {
2962 dTARGET;
2963 if (SvPADMY(TARG)) {
2964 sv_setsv(TARG, tmpsv);
2965 SETTARG;
2966 }
2967 else
2968 SETs(tmpsv);
2969 }
2970 PUTBACK;
2971 return TRUE;
2972 }
2973
2974 if ((flags & AMGf_numeric) && SvROK(arg))
2975 *sp = sv_2num(arg);
2976 return FALSE;
2977}
2978
2979
2980/* Implement tryAMAGICbin_MG macro.
2981 Do get magic, then see if the two stack args are overloaded and if so
2982 call it.
2983 Flags:
2984 AMGf_set return the arg using SETs rather than assigning to
2985 the targ
2986 AMGf_assign op may be called as mutator (eg +=)
2987 AMGf_numeric apply sv_2num to the stack arg.
2988*/
2989
2990bool
2991Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM
2992 dSP;
2993 SV* const left = TOPm1s;
2994 SV* const right = TOPs;
2995
2996 SvGETMAGIC(left);
2997 if (left != right)
2998 SvGETMAGIC(right);
2999
3000 if (SvAMAGIC(left) || SvAMAGIC(right)) {
72876cce
DM
3001 SV * tmpsv;
3002 /* STACKED implies mutator variant, e.g. $x += 1 */
3003 bool mutator = (flags & AMGf_assign) && (PL_op->op_flags & OPf_STACKED);
3004
3005 tmpsv = amagic_call(left, right, method,
3006 (mutator ? AMGf_assign: 0)
636ac8fc 3007 | (flags & AMGf_numarg));
6f1401dc
DM
3008 if (tmpsv) {
3009 if (flags & AMGf_set) {
3010 (void)POPs;
3011 SETs(tmpsv);
3012 }
3013 else {
3014 dATARGET;
3015 (void)POPs;
72876cce 3016 if (mutator || SvPADMY(TARG)) {
6f1401dc
DM
3017 sv_setsv(TARG, tmpsv);
3018 SETTARG;
3019 }
3020 else
3021 SETs(tmpsv);
3022 }
3023 PUTBACK;
3024 return TRUE;
3025 }
3026 }
75ea7a12
FC
3027 if(left==right && SvGMAGICAL(left)) {
3028 SV * const left = sv_newmortal();
3029 *(sp-1) = left;
3030 /* Print the uninitialized warning now, so it includes the vari-
3031 able name. */
3032 if (!SvOK(right)) {
3033 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
3034 sv_setsv_flags(left, &PL_sv_no, 0);
3035 }
3036 else sv_setsv_flags(left, right, 0);
3037 SvGETMAGIC(right);
3038 }
6f1401dc 3039 if (flags & AMGf_numeric) {
75ea7a12
FC
3040 if (SvROK(TOPm1s))
3041 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
3042 if (SvROK(right))
3043 *sp = sv_2num(right);
3044 }
3045 return FALSE;
3046}
3047
25a9ffce
NC
3048SV *
3049Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
3050 SV *tmpsv = NULL;
3d147ac2 3051 HV *stash;
25a9ffce
NC
3052
3053 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
3054
3d147ac2
DM
3055 if (!SvAMAGIC(ref))
3056 return ref;
3057 /* return quickly if none of the deref ops are overloaded */
3058 stash = SvSTASH(SvRV(ref));
3059 assert(SvOOK(stash));
3060 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
3061 return ref;
3062
3063 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC
3064 AMGf_noright | AMGf_unary))) {
3065 if (!SvROK(tmpsv))
3066 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
3067 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
3068 /* Bail out if it returns us the same reference. */
3069 return tmpsv;
3070 }
3071 ref = tmpsv;
3d147ac2
DM
3072 if (!SvAMAGIC(ref))
3073 break;
25a9ffce
NC
3074 }
3075 return tmpsv ? tmpsv : ref;
3076}
6f1401dc 3077
8d569291
FC
3078bool
3079Perl_amagic_is_enabled(pTHX_ int method)
3080{
3081 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
3082
3083 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
3084
3085 if ( !lex_mask || !SvOK(lex_mask) )
3086 /* overloading lexically disabled */
3087 return FALSE;
3088 else if ( lex_mask && SvPOK(lex_mask) ) {
3089 /* we have an entry in the hints hash, check if method has been
3090 * masked by overloading.pm */
3091 STRLEN len;
3092 const int offset = method / 8;
3093 const int bit = method % 8;
3094 char *pv = SvPV(lex_mask, len);
3095
3096 /* Bit set, so this overloading operator is disabled */
3097 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
3098 return FALSE;
3099 }
3100 return TRUE;
3101}
3102
a0d0e21e 3103SV*
864dbfa3 3104Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 3105{
27da23d5 3106 dVAR;
b267980d 3107 MAGIC *mg;
9c5ffd7c 3108 CV *cv=NULL;
a0d0e21e 3109 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3110 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
3111 int off = 0, off1, lr = 0, notfound = 0;
3112 int postpr = 0, force_cpy = 0;
3113 int assign = AMGf_assign & flags;
3114 const int assignshift = assign ? 1 : 0;
bf5522a1 3115 int use_default_op = 0;
67288365 3116 int force_scalar = 0;
497b47a8
JH
3117#ifdef DEBUGGING
3118 int fl=0;
497b47a8 3119#endif
25716404 3120 HV* stash=NULL;
7918f24d
NC
3121
3122 PERL_ARGS_ASSERT_AMAGIC_CALL;
3123
e46c382e 3124 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3125 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK
3126 }
3127
a0d0e21e 3128 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3129 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3130 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3131 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3132 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3133 : NULL))
b267980d 3134 && ((cv = cvp[off=method+assignshift])
748a9306
LW
3135 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3136 * usual method */
497b47a8
JH
3137 (
3138#ifdef DEBUGGING
3139 fl = 1,
a0288114 3140#endif
497b47a8 3141 cv = cvp[off=method])))) {
a0d0e21e
LW
3142 lr = -1; /* Call method for left argument */
3143 } else {
3144 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3145 int logic;
3146
3147 /* look for substituted methods */
ee239bfe 3148 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
3149 switch (method) {
3150 case inc_amg:
ee239bfe
IZ
3151 force_cpy = 1;
3152 if ((cv = cvp[off=add_ass_amg])
3153 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3154 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
3155 }
3156 break;
3157 case dec_amg:
ee239bfe
IZ
3158 force_cpy = 1;
3159 if ((cv = cvp[off = subtr_ass_amg])
3160 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3161 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
3162 }
3163 break;
3164 case bool__amg:
3165 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3166 break;
3167 case numer_amg:
3168 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3169 break;
3170 case string_amg:
3171 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3172 break;
b7787f18
AL
3173 case not_amg:
3174 (void)((cv = cvp[off=bool__amg])
3175 || (cv = cvp[off=numer_amg])
3176 || (cv = cvp[off=string_amg]));
2ab54efd
MB
3177 if (cv)
3178 postpr = 1;
b7787f18 3179 break;
748a9306
LW
3180 case copy_amg:
3181 {
76e3520e
GS
3182 /*
3183 * SV* ref causes confusion with the interpreter variable of
3184 * the same name
3185 */
890ce7af 3186 SV* const tmpRef=SvRV(left);
76e3520e 3187 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
3188 /*
3189 * Just to be extra cautious. Maybe in some
3190 * additional cases sv_setsv is safe, too.
3191 */
890ce7af 3192 SV* const newref = newSVsv(tmpRef);
748a9306 3193 SvOBJECT_on(newref);
a1cd65be
FC
3194 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3195 delegate to the stash. */
85fbaab2 3196 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
3197 return newref;
3198 }
3199 }
3200 break;
a0d0e21e 3201 case abs_amg:
b267980d 3202 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3203 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
725c44f9 3204 SV* const nullsv=&PL_sv_zero;
a0d0e21e 3205 if (off1==lt_amg) {
890ce7af 3206 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e 3207 lt_amg,AMGf_noright);
f4c975aa 3208 logic = SvTRUE_NN(lessp);
a0d0e21e 3209 } else {
890ce7af 3210 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3211 ncmp_amg,AMGf_noright);
3212 logic = (SvNV(lessp) < 0);
3213 }
3214 if (logic) {
3215 if (off==subtr_amg) {
3216 right = left;
748a9306 3217 left = nullsv;
a0d0e21e
LW
3218 lr = 1;
3219 }
3220 } else {
3221 return left;
3222 }
3223 }
3224 break;
3225 case neg_amg:
155aba94 3226 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e 3227 right = left;
725c44f9 3228 left = &PL_sv_zero;
a0d0e21e
LW
3229 lr = 1;
3230 }
3231 break;
f216259d 3232 case int_amg:
f5284f61 3233 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3234 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3235 case regexp_amg:
b267980d
NIS
3236 /* FAIL safe */
3237 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3238
f5284f61
IZ
3239 case to_sv_amg:
3240 case to_av_amg:
3241 case to_hv_amg:
3242 case to_gv_amg:
3243 case to_cv_amg:
3244 /* FAIL safe */
b267980d 3245 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3246
a0d0e21e
LW
3247 default:
3248 goto not_found;
3249 }
3250 if (!cv) goto not_found;
3251 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3252 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3253 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3254 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3255 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3256 : NULL))
69815d08
RS
3257 && (cv = cvp[off=method])) { /* Method for right
3258 * argument found */
3259 lr=1;
bf5522a1
MB
3260 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3261 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
3262 && !(flags & AMGf_unary)) {
3263 /* We look for substitution for
3264 * comparison operations and
fc36a67e 3265 * concatenation */
a0d0e21e
LW
3266 if (method==concat_amg || method==concat_ass_amg
3267 || method==repeat_amg || method==repeat_ass_amg) {
3268 return NULL; /* Delegate operation to string conversion */
3269 }
3270 off = -1;
3271 switch (method) {
3272 case lt_amg:
3273 case le_amg:
3274 case gt_amg:
3275 case ge_amg:
3276 case eq_amg:
3277 case ne_amg:
2ab54efd
MB
3278 off = ncmp_amg;
3279 break;
a0d0e21e
LW
3280 case slt_amg:
3281 case sle_amg:
3282 case sgt_amg:
3283 case sge_amg:
3284 case seq_amg:
3285 case sne_amg:
2ab54efd
MB
3286 off = scmp_amg;
3287 break;
a0d0e21e 3288 }
bf5522a1
MB
3289 if (off != -1) {
3290 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3291 cv = ocvp[off];
3292 lr = -1;
3293 }
3294 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3295 cv = cvp[off];
3296 lr = 1;
3297 }
3298 }
3299 if (cv)
2ab54efd
MB
3300 postpr = 1;
3301 else
3302 goto not_found;
a0d0e21e 3303 } else {
a6006777 3304 not_found: /* No method found, either report or croak */
b267980d
NIS
3305 switch (method) {
3306 case to_sv_amg:
3307 case to_av_amg:
3308 case to_hv_amg:
3309 case to_gv_amg:
3310 case to_cv_amg:
3311 /* FAIL safe */
3312 return left; /* Delegate operation to standard mechanisms. */
b267980d 3313 }
a0d0e21e
LW
3314 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3315 notfound = 1; lr = -1;
3316 } else if (cvp && (cv=cvp[nomethod_amg])) {
3317 notfound = 1; lr = 1;
bf5522a1
MB
3318 } else if ((use_default_op =
3319 (!ocvp || oamtp->fallback >= AMGfallYES)
3320 && (!cvp || amtp->fallback >= AMGfallYES))
3321 && !DEBUG_o_TEST) {
4cc0ca18
NC
3322 /* Skip generating the "no method found" message. */
3323 return NULL;
a0d0e21e 3324 } else {
46fc3d4c 3325 SV *msg;
774d564b 3326 if (off==-1) off=method;
b267980d 3327 msg = sv_2mortal(Perl_newSVpvf(aTHX_
147e3846 3328 "Operation \"%s\": no method found,%sargument %s%" SVf "%s%" SVf,
d66cca07
BF
3329 AMG_id2name(method + assignshift),
3330 (flags & AMGf_unary ? " " : "\n\tleft "),
3331 SvAMAGIC(left)?
3332 "in overloaded package ":
3333 "has no overloaded magic",
3334 SvAMAGIC(left)?
3335 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3336 SVfARG(&PL_sv_no),
3337 SvAMAGIC(right)?
3338 ",\n\tright argument in overloaded package ":
3339 (flags & AMGf_unary
3340 ? ""
3341 : ",\n\tright argument has no overloaded magic"),
3342 SvAMAGIC(right)?
3343 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3344 SVfARG(&PL_sv_no)));
bf5522a1 3345 if (use_default_op) {
147e3846 3346 DEBUG_o( Perl_deb(aTHX_ "%" SVf, SVfARG(msg)) );
a0d0e21e 3347 } else {
147e3846 3348 Perl_croak(aTHX_ "%" SVf, SVfARG(msg));
a0d0e21e
LW
3349 }
3350 return NULL;
3351 }
ee239bfe 3352 force_cpy = force_cpy || assign;
a0d0e21e
LW
3353 }
3354 }
67288365
JL
3355
3356 switch (method) {
3357 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3358 * operation. we need this to return a value, so that it can be assigned
3359 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3360 * increment or decrement was itself called in void context */
3361 case inc_amg:
3362 if (off == add_amg)
3363 force_scalar = 1;
3364 break;
3365 case dec_amg:
3366 if (off == subtr_amg)
3367 force_scalar = 1;
3368 break;
3369 /* in these cases, we're calling an assignment variant of an operator
3370 * (+= rather than +, for instance). regardless of whether it's a
3371 * fallback or not, it always has to return a value, which will be
3372 * assigned to the proper variable later */
3373 case add_amg:
3374 case subtr_amg:
3375 case mult_amg:
3376 case div_amg:
3377 case modulo_amg:
3378 case pow_amg:
3379 case lshift_amg:
3380 case rshift_amg:
3381 case repeat_amg:
3382 case concat_amg:
3383 case band_amg:
3384 case bor_amg:
3385 case bxor_amg:
6d06ecce
FC
3386 case sband_amg:
3387 case sbor_amg:
3388 case sbxor_amg:
67288365
JL
3389 if (assign)
3390 force_scalar = 1;
3391 break;
3392 /* the copy constructor always needs to return a value */
3393 case copy_amg:
3394 force_scalar = 1;
3395 break;
3396 /* because of the way these are implemented (they don't perform the
3397 * dereferencing themselves, they return a reference that perl then
3398 * dereferences later), they always have to be in scalar context */
3399 case to_sv_amg:
3400 case to_av_amg:
3401 case to_hv_amg:
3402 case to_gv_amg:
3403 case to_cv_amg:
3404 force_scalar = 1;
3405 break;
3406 /* these don't have an op of their own; they're triggered by their parent
3407 * op, so the context there isn't meaningful ('$a and foo()' in void
3408 * context still needs to pass scalar context on to $a's bool overload) */
3409 case bool__amg:
3410 case numer_amg:
3411 case string_amg:
3412 force_scalar = 1;
3413 break;
3414 }
3415
497b47a8 3416#ifdef DEBUGGING
a0d0e21e 3417 if (!notfound) {
497b47a8 3418 DEBUG_o(Perl_deb(aTHX_
147e3846 3419 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %" SVf "%s\n",
497b47a8
JH
3420 AMG_id2name(off),
3421 method+assignshift==off? "" :
a0288114 3422 " (initially \"",
497b47a8
JH
3423 method+assignshift==off? "" :
3424 AMG_id2name(method+assignshift),
a0288114 3425 method+assignshift==off? "" : "\")",
497b47a8
JH
3426 flags & AMGf_unary? "" :
3427 lr==1 ? " for right argument": " for left argument",
3428 flags & AMGf_unary? " for argument" : "",
d66cca07 3429 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3430 fl? ",\n\tassignment variant used": "") );
ee239bfe 3431 }
497b47a8 3432#endif
748a9306
LW
3433 /* Since we use shallow copy during assignment, we need
3434 * to dublicate the contents, probably calling user-supplied
3435 * version of copy operator
3436 */
ee239bfe
IZ
3437 /* We need to copy in following cases:
3438 * a) Assignment form was called.
3439 * assignshift==1, assign==T, method + 1 == off
3440 * b) Increment or decrement, called directly.
3441 * assignshift==0, assign==0, method + 0 == off
3442 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3443 * assignshift==0, assign==T,
ee239bfe
IZ
3444 * force_cpy == T
3445 * d) Increment or decrement, translated to nomethod.
b267980d 3446 * assignshift==0, assign==0,
ee239bfe
IZ
3447 * force_cpy == T
3448 * e) Assignment form translated to nomethod.
3449 * assignshift==1, assign==T, method + 1 != off
3450 * force_cpy == T
3451 */
3452 /* off is method, method+assignshift, or a result of opcode substitution.
3453 * In the latter case assignshift==0, so only notfound case is important.
3454 */
73512201 3455 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3456 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3457 || force_cpy) )
6f1401dc 3458 {
1b38c28e
NC
3459 /* newSVsv does not behave as advertised, so we copy missing
3460 * information by hand */
3461 SV *tmpRef = SvRV(left);
3462 SV *rv_copy;
31d632c3 3463 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
3464 SvRV_set(left, rv_copy);
3465 SvSETMAGIC(left);
e7881358 3466 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3467 }
6f1401dc
DM
3468 }
3469
a0d0e21e
LW
3470 {
3471 dSP;
3472 BINOP myop;
3473 SV* res;
b7787f18 3474 const bool oldcatch = CATCH_GET;
67288365 3475 I32 oldmark, nret;
e839e6ed
DM
3476 /* for multiconcat, we may call overload several times,
3477 * with the context of individual concats being scalar,
3478 * regardless of the overall context of the multiconcat op
3479 */
3480 U8 gimme = (force_scalar || PL_op->op_type == OP_MULTICONCAT)
3481 ? G_SCALAR : GIMME_V;
a0d0e21e 3482
54310121 3483 CATCH_SET(TRUE);
a0d0e21e
LW
3484 Zero(&myop, 1, BINOP);
3485 myop.op_last = (OP *) &myop;
b37c2d43 3486 myop.op_next = NULL;
67288365
JL
3487 myop.op_flags = OPf_STACKED;
3488
3489 switch (gimme) {
3490 case G_VOID:
3491 myop.op_flags |= OPf_WANT_VOID;
3492 break;
3493 case G_ARRAY:
3494 if (flags & AMGf_want_list) {
3495 myop.op_flags |= OPf_WANT_LIST;
3496 break;
3497 }
3498 /* FALLTHROUGH */
3499 default:
3500 myop.op_flags |= OPf_WANT_SCALAR;
3501 break;
3502 }
a0d0e21e 3503
e788e7d3 3504 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3505 ENTER;
462e5cf6 3506 SAVEOP();
533c011a 3507 PL_op = (OP *) &myop;
3280af22 3508 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3509 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3510 Perl_pp_pushmark(aTHX);
a0d0e21e 3511
924508f0 3512 EXTEND(SP, notfound + 5);
a0d0e21e
LW
3513 PUSHs(lr>0? right: left);
3514 PUSHs(lr>0? left: right);
3280af22 3515 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3516 if (notfound) {
59cd0e26
NC
3517 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3518 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3519 }
636ac8fc
FC
3520 else if (flags & AMGf_numarg)
3521 PUSHs(&PL_sv_undef);
3522 if (flags & AMGf_numarg)
3523 PUSHs(&PL_sv_yes);
ad64d0ec 3524 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3525 PUTBACK;
67288365 3526 oldmark = TOPMARK;
a0d0e21e 3527
139d0ce6 3528 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3529 CALLRUNOPS(aTHX);
a0d0e21e
LW
3530 LEAVE;
3531 SPAGAIN;
67288365
JL
3532 nret = SP - (PL_stack_base + oldmark);
3533
3534 switch (gimme) {
3535 case G_VOID:
3536 /* returning NULL has another meaning, and we check the context
3537 * at the call site too, so this can be differentiated from the
3538 * scalar case */
3539 res = &PL_sv_undef;
3540 SP = PL_stack_base + oldmark;
3541 break;
2165bd23 3542 case G_ARRAY:
67288365
JL
3543 if (flags & AMGf_want_list) {
3544 res = sv_2mortal((SV *)newAV());
3545 av_extend((AV *)res, nret);
3546 while (nret--)
3547 av_store((AV *)res, nret, POPs);
3548 break;
3549 }
3550 /* FALLTHROUGH */
67288365
JL
3551 default:
3552 res = POPs;
3553 break;
3554 }
a0d0e21e 3555
ebafeae7 3556 PUTBACK;
d3acc0f7 3557 POPSTACK;
54310121 3558 CATCH_SET(oldcatch);
a0d0e21e 3559
a0d0e21e 3560 if (postpr) {
b7787f18 3561 int ans;
a0d0e21e
LW
3562 switch (method) {
3563 case le_amg:
3564 case sle_amg:
3565 ans=SvIV(res)<=0; break;
3566 case lt_amg:
3567 case slt_amg:
3568 ans=SvIV(res)<0; break;
3569 case ge_amg:
3570 case sge_amg:
3571 ans=SvIV(res)>=0; break;
3572 case gt_amg:
3573 case sgt_amg:
3574 ans=SvIV(res)>0; break;
3575 case eq_amg:
3576 case seq_amg:
3577 ans=SvIV(res)==0; break;
3578 case ne_amg:
3579 case sne_amg:
3580 ans=SvIV(res)!=0; break;
3581 case inc_amg:
3582 case dec_amg:
bbce6d69 3583 SvSetSV(left,res); return left;
dc437b57 3584 case not_amg:
f4c975aa 3585 ans=!SvTRUE_NN(res); break;
b7787f18
AL
3586 default:
3587 ans=0; break;
a0d0e21e 3588 }
54310121 3589 return boolSV(ans);
748a9306
LW
3590 } else if (method==copy_amg) {
3591 if (!SvROK(res)) {
cea2e8a9 3592 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
3593 }
3594 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
3595 } else {
3596 return res;
3597 }
3598 }
3599}
c9d5ac95 3600
f5c1e807
NC
3601void
3602Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3603{
3604 dVAR;
acda4c6a 3605 U32 hash;
f5c1e807 3606
7918f24d 3607 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3608
acda4c6a 3609 if (len > I32_MAX)
147e3846 3610 Perl_croak(aTHX_ "panic: gv name too long (%" UVuf ")", (UV) len);
acda4c6a 3611
ae8cc45f
NC