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[perl #125541] Fix crash with %::=(); J->${\"::"}
[perl5.git] / gv.c
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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW
20 */
21
ccfc67b7
JH
22/*
23=head1 GV Functions
166f8a29
DM
24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH
32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
6ffcffbd 37#include "overload.inc"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a 41static const char S_autoload[] = "AUTOLOAD";
3c81f0b3 42#define S_autolen (sizeof("AUTOLOAD")-1)
5c7983e5 43
13c59d41
MH
44GV *
45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13c59d41
MH
49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
13be902c 53 && SvTYPE((const SV *)gv) != SVt_PVLV
13c59d41 54 )
13be902c 55 ) {
bb85b28a 56 const char *what;
13c59d41 57 if (type == SVt_PVIO) {
bb85b28a
NC
58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
13c59d41 64 } else if (type == SVt_PVHV) {
bb85b28a
NC
65 what = "hash";
66 } else {
13c59d41 67 what = type == SVt_PVAV ? "array" : "scalar";
bb85b28a 68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896 72
13c59d41
MH
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
13c59d41
MH
83 if (!*where)
84 {
85 *where = newSV_type(type);
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
e17aed30 89 }
13c59d41 90 return gv;
79072805
LW
91}
92
93GV *
864dbfa3 94Perl_gv_fetchfile(pTHX_ const char *name)
79072805 95{
7918f24d 96 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC
97 return gv_fetchfile_flags(name, strlen(name), 0);
98}
99
100GV *
101Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
102 const U32 flags)
103{
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW
107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC
110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS
116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS
120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC
122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
c7a622b3 132 if (PERLDB_LINE_OR_SAVESRC && !GvAV(gv))
43e4250a 133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
53d95988
CS
134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW
136 return gv;
137}
138
62d55b22
NC
139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
145NULL.
146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d 153 PERL_ARGS_ASSERT_GV_CONST_SV;
23491f1d 154 PERL_UNUSED_CONTEXT;
7918f24d 155
62d55b22
NC
156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
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
307overwriting it as happens with typeglobs created by SvSetSV. Converting
308any scalar that is SvOK() may produce unpredictable results and is reserved
309for perl's internal use.
310
311C<gv> is the scalar to be converted.
312
313C<stash> is the parent stash/package, if any.
314
04ec7e59
FC
315C<name> and C<len> give the name. The name must be unqualified;
316that is, it must not include the package name. If C<gv> is a
e1104062
FC
317stash element, it is the caller's responsibility to ensure that the name
318passed to this function matches the name of the element. If it does not
319match, perl's internal bookkeeping will get out of sync.
320
04ec7e59
FC
321C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
322the return value of SvUTF8(sv). It can also take the
323GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC
324seen before (i.e., suppress "Used once" warnings).
325
326=for apidoc gv_init
327
328The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC
329has no flags parameter. If the C<multi> parameter is set, the
330GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC
331
332=for apidoc gv_init_pv
333
334Same as gv_init_pvn(), but takes a nul-terminated string for the name
335instead of separate char * and length parameters.
336
337=for apidoc gv_init_sv
338
339Same as gv_init_pvn(), but takes an SV * for the name instead of separate
340char * and length parameters. C<flags> is currently unused.
341
342=cut
343*/
344
463ee0b2 345void
04ec7e59 346Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF
347{
348 char *namepv;
349 STRLEN namelen;
350 PERL_ARGS_ASSERT_GV_INIT_SV;
351 namepv = SvPV(namesv, namelen);
352 if (SvUTF8(namesv))
353 flags |= SVf_UTF8;
04ec7e59 354 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF
355}
356
357void
04ec7e59 358Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF
359{
360 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 361 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF
362}
363
364void
04ec7e59 365Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 366{
3b6733bf
NC
367 const U32 old_type = SvTYPE(gv);
368 const bool doproto = old_type > SVt_NULL;
f9509170 369 char * const proto = (doproto && SvPOK(gv))
dad95a0a 370 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 371 : NULL;
49a54bbe 372 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 373 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 374 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 375 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 376
e6066781 377 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC
378 assert (!(proto && has_constant));
379
380 if (has_constant) {
2eaf799e 381 /* The constant has to be a scalar, array or subroutine. */
5c1f4d79 382 switch (SvTYPE(has_constant)) {
5c1f4d79 383 case SVt_PVHV:
5c1f4d79
NC
384 case SVt_PVFM:
385 case SVt_PVIO:
386 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
387 sv_reftype(has_constant, 0));
81d52ecd 388
42d0e0b7 389 default: NOOP;
5c1f4d79 390 }
756cb477
NC
391 SvRV_set(gv, NULL);
392 SvROK_off(gv);
393 }
463ee0b2 394
3b6733bf
NC
395
396 if (old_type < SVt_PVGV) {
397 if (old_type >= SVt_PV)
398 SvCUR_set(gv, 0);
ad64d0ec 399 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 400 }
55d729e4
GS
401 if (SvLEN(gv)) {
402 if (proto) {
f880fe2f 403 SvPV_set(gv, NULL);
b162af07 404 SvLEN_set(gv, 0);
55d729e4
GS
405 SvPOK_off(gv);
406 } else
94010e71 407 Safefree(SvPVX_mutable(gv));
55d729e4 408 }
2e5b91de
NC
409 SvIOK_off(gv);
410 isGV_with_GP_on(gv);
12816592 411
c43ae56f 412 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC
413 GvSTASH(gv) = stash;
414 if (stash)
ad64d0ec 415 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 416 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC
417 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
418 GvMULTI_on(gv); /* _was_ mentioned */
2eaf799e
FC
419 if (has_constant && SvTYPE(has_constant) == SVt_PVCV) {
420 /* Not actually a constant. Just a regular sub. */
421 CV * const cv = (CV *)has_constant;
422 GvCV_set(gv,cv);
423 if (CvSTASH(cv) == stash && (
424 CvNAME_HEK(cv) == GvNAME_HEK(gv)
425 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
426 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
427 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
428 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
429 )
430 ))
431 CvGV_set(cv,gv);
432 }
433 else if (doproto) {
e3d2b9e7 434 CV *cv;
756cb477
NC
435 if (has_constant) {
436 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 437 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC
438 /* In case op.c:S_process_special_blocks stole it: */
439 if (!GvCV(gv))
c43ae56f 440 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 441 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC
442 /* If this reference was a copy of another, then the subroutine
443 must have been "imported", by a Perl space assignment to a GV
444 from a reference to CV. */
445 if (exported_constant)
446 GvIMPORTED_CV_on(gv);
186a5ba8 447 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 448 } else {
186a5ba8 449 cv = newSTUB(gv,1);
756cb477 450 }
55d729e4 451 if (proto) {
e3d2b9e7 452 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 453 SV_HAS_TRAILING_NUL);
e0260a5b 454 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS
455 }
456 }
463ee0b2
LW
457}
458
76e3520e 459STATIC void
e6066781 460S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 461{
13c59d41
MH
462 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
463
464 switch (sv_type) {
465 case SVt_PVIO:
466 (void)GvIOn(gv);
467 break;
468 case SVt_PVAV:
469 (void)GvAVn(gv);
470 break;
471 case SVt_PVHV:
472 (void)GvHVn(gv);
473 break;
c69033f2 474#ifdef PERL_DONT_CREATE_GVSV
13c59d41
MH
475 case SVt_NULL:
476 case SVt_PVCV:
477 case SVt_PVFM:
478 case SVt_PVGV:
479 break;
480 default:
481 if(GvSVn(gv)) {
482 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
483 If we just cast GvSVn(gv) to void, it ignores evaluating it for
484 its side effect */
485 }
c69033f2 486#endif
a0d0e21e
LW
487 }
488}
489
0f8d4b5e
FC
490static void core_xsub(pTHX_ CV* cv);
491
492static GV *
493S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 494 const char * const name, const STRLEN len)
0f8d4b5e
FC
495{
496 const int code = keyword(name, len, 1);
497 static const char file[] = __FILE__;
97021f77 498 CV *cv, *oldcompcv = NULL;
0f8d4b5e 499 int opnum = 0;
0f8d4b5e 500 bool ampable = TRUE; /* &{}-able */
97021f77
FC
501 COP *oldcurcop = NULL;
502 yy_parser *oldparser = NULL;
503 I32 oldsavestack_ix = 0;
0f8d4b5e
FC
504
505 assert(gv || stash);
506 assert(name);
0f8d4b5e 507
88b892d8
FC
508 if (!code) return NULL; /* Not a keyword */
509 switch (code < 0 ? -code : code) {
0f8d4b5e 510 /* no support for \&CORE::infix;
d885f758 511 no support for funcs that do not parse like funcs */
88b892d8 512 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 513 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 514 case KEY_default : case KEY_DESTROY:
88b892d8 515 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 516 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 517 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 518 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC
519 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
520 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
521 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 522 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 523 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 524 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 525 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 526 case KEY_state: case KEY_sub :
46bef06f 527 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC
528 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
529 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC
530 return NULL;
531 case KEY_chdir:
eb31eb35 532 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 533 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC
534 case KEY_keys:
535 case KEY_lstat:
536 case KEY_pop:
537 case KEY_push:
538 case KEY_shift:
a99f2ca2 539 case KEY_splice: case KEY_split:
0f8d4b5e
FC
540 case KEY_stat:
541 case KEY_system:
542 case KEY_truncate: case KEY_unlink:
543 case KEY_unshift:
544 case KEY_values:
545 ampable = FALSE;
546 }
547 if (!gv) {
548 gv = (GV *)newSV(0);
549 gv_init(gv, stash, name, len, TRUE);
550 }
7e68c38b 551 GvMULTI_on(gv);
0f8d4b5e
FC
552 if (ampable) {
553 ENTER;
554 oldcurcop = PL_curcop;
555 oldparser = PL_parser;
556 lex_start(NULL, NULL, 0);
557 oldcompcv = PL_compcv;
558 PL_compcv = NULL; /* Prevent start_subparse from setting
559 CvOUTSIDE. */
560 oldsavestack_ix = start_subparse(FALSE,0);
561 cv = PL_compcv;
562 }
563 else {
564 /* Avoid calling newXS, as it calls us, and things start to
565 get hairy. */
566 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
567 GvCV_set(gv,cv);
568 GvCVGEN(gv) = 0;
0f8d4b5e
FC
569 CvISXSUB_on(cv);
570 CvXSUB(cv) = core_xsub;
eacbb379 571 PoisonPADLIST(cv);
0f8d4b5e
FC
572 }
573 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
574 from PL_curcop. */
575 (void)gv_fetchfile(file);
576 CvFILE(cv) = (char *)file;
577 /* XXX This is inefficient, as doing things this order causes
578 a prototype check in newATTRSUB. But we have to do
579 it this order as we need an op number before calling
580 new ATTRSUB. */
581 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 582 if (stash)
73c02f15 583 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 584 if (ampable) {
4428fb0e
TC
585#ifdef DEBUGGING
586 CV *orig_cv = cv;
587#endif
0f8d4b5e 588 CvLVALUE_on(cv);
4428fb0e
TC
589 /* newATTRSUB will free the CV and return NULL if we're still
590 compiling after a syntax error */
e8f91c91 591 if ((cv = newATTRSUB_x(
7e68c38b 592 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC
593 NULL,NULL,
594 coresub_op(
595 opnum
596 ? newSVuv((UV)opnum)
597 : newSVpvn(name,len),
598 code, opnum
7e68c38b 599 ),
e8f91c91 600 TRUE
4428fb0e
TC
601 )) != NULL) {
602 assert(GvCV(gv) == orig_cv);
603 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
604 && opnum != OP_UNDEF)
605 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
606 }
0f8d4b5e
FC
607 LEAVE;
608 PL_parser = oldparser;
609 PL_curcop = oldcurcop;
610 PL_compcv = oldcompcv;
611 }
4428fb0e
TC
612 if (cv) {
613 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
614 cv_set_call_checker(
615 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
616 );
617 SvREFCNT_dec(opnumsv);
618 }
619
0f8d4b5e
FC
620 return gv;
621}
622
954c1994 623/*
6c53d59b
FC
624=for apidoc gv_fetchmeth
625
626Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
627
e6919483
BF
628=for apidoc gv_fetchmeth_sv
629
630Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
631of an SV instead of a string/length pair.
632
633=cut
634*/
635
636GV *
637Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
638{
c290e187 639 char *namepv;
640 STRLEN namelen;
641 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
642 if (LIKELY(SvPOK_nog(namesv))) /* common case */
643 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, flags);
644 namepv = SvPV(namesv, namelen);
645 if (SvUTF8(namesv)) flags |= SVf_UTF8;
646 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF
647}
648
649/*
650=for apidoc gv_fetchmeth_pv
651
652Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
653instead of a string/length pair.
654
655=cut
656*/
657
658GV *
659Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
660{
661 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 662 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF
663}
664
665/*
666=for apidoc gv_fetchmeth_pvn
954c1994
GS
667
668Returns the glob with the given C<name> and a defined subroutine or
669C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 670accessible via @ISA and UNIVERSAL::.
954c1994
GS
671
672The argument C<level> should be either 0 or -1. If C<level==0>, as a
673side-effect creates a glob with the given C<name> in the given C<stash>
674which in the case of success contains an alias for the subroutine, and sets
e1a479c5 675up caching info for this glob.
954c1994 676
aae43805
FC
677The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
678
679GV_SUPER indicates that we want to look up the method in the superclasses
680of the C<stash>.
e6919483 681
aae43805 682The
954c1994 683GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 684visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 685the GV directly; instead, you should use the method's CV, which can be
b267980d 686obtained from the GV with the C<GvCV> macro.
954c1994
GS
687
688=cut
689*/
690
e1a479c5
BB
691/* NOTE: No support for tied ISA */
692
c6afe666 693PERL_STATIC_INLINE GV*
694S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 695{
463ee0b2 696 GV** gvp;
c6afe666 697 HE* he;
e1a479c5
BB
698 AV* linear_av;
699 SV** linear_svp;
700 SV* linear_sv;
aae43805 701 HV* cstash, *cachestash;
e1a479c5
BB
702 GV* candidate = NULL;
703 CV* cand_cv = NULL;
e1a479c5 704 GV* topgv = NULL;
bfcb3514 705 const char *hvname;
c6afe666 706 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 707 I32 items;
e1a479c5 708 U32 topgen_cmp;
04f3bf56 709 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 710
af09ea45
IK
711 /* UNIVERSAL methods should be callable without a stash */
712 if (!stash) {
e1a479c5 713 create = 0; /* probably appropriate */
da51bb9b 714 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK
715 return 0;
716 }
717
e1a479c5
BB
718 assert(stash);
719
bfcb3514
NC
720 hvname = HvNAME_get(stash);
721 if (!hvname)
e1a479c5 722 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 723
e1a479c5 724 assert(hvname);
55df6700 725 assert(name || meth);
463ee0b2 726
aae43805 727 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC
728 flags & GV_SUPER ? "SUPER " : "",
729 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 730
dd69841b 731 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 732
aae43805 733 if (flags & GV_SUPER) {
1a33a059
FC
734 if (!HvAUX(stash)->xhv_mro_meta->super)
735 HvAUX(stash)->xhv_mro_meta->super = newHV();
736 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC
737 }
738 else cachestash = stash;
739
e1a479c5 740 /* check locally for a real method or a cache entry */
c6afe666 741 he = (HE*)hv_common(
742 cachestash, meth, name, len, (flags & SVf_UTF8) ? HVhek_UTF8 : 0, create, NULL, 0
743 );
744 if (he) gvp = (GV**)&HeVAL(he);
745 else gvp = NULL;
746
e1a479c5
BB
747 if(gvp) {
748 topgv = *gvp;
0f8d4b5e 749 have_gv:
e1a479c5
BB
750 assert(topgv);
751 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC
752 {
753 if (!name)
754 name = SvPV_nomg(meth, len);
04ec7e59 755 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 756 }
e1a479c5
BB
757 if ((cand_cv = GvCV(topgv))) {
758 /* If genuine method or valid cache entry, use it */
759 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
760 return topgv;
761 }
762 else {
763 /* stale cache entry, junk it and move on */
e7881358 764 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM
765 GvCV_set(topgv, NULL);
766 cand_cv = NULL;
e1a479c5
BB
767 GvCVGEN(topgv) = 0;
768 }
769 }
770 else if (GvCVGEN(topgv) == topgen_cmp) {
771 /* cache indicates no such method definitively */
772 return 0;
773 }
aae43805
FC
774 else if (stash == cachestash
775 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 776 && strnEQ(hvname, "CORE", 4)
87566176 777 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 778 goto have_gv;
463ee0b2 779 }
79072805 780
aae43805 781 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB
782 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
783 items = AvFILLp(linear_av); /* no +1, to skip over self */
784 while (items--) {
785 linear_sv = *linear_svp++;
786 assert(linear_sv);
787 cstash = gv_stashsv(linear_sv, 0);
788
dd69841b 789 if (!cstash) {
ecad31f0 790 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 791 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 792 SVfARG(linear_sv),
d0c0e7dd 793 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB
794 continue;
795 }
9607fc9c 796
e1a479c5
BB
797 assert(cstash);
798
c60dbbc3 799 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC
800 if (!gvp) {
801 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
802 const char *hvname = HvNAME(cstash); assert(hvname);
803 if (strnEQ(hvname, "CORE", 4)
804 && (candidate =
87566176 805 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC
806 ))
807 goto have_candidate;
808 }
809 continue;
810 }
811 else candidate = *gvp;
812 have_candidate:
e1a479c5 813 assert(candidate);
04f3bf56 814 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 815 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
816 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
817 /*
818 * Found real method, cache method in topgv if:
819 * 1. topgv has no synonyms (else inheritance crosses wires)
820 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
821 */
822 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
823 CV *old_cv = GvCV(topgv);
824 SvREFCNT_dec(old_cv);
e1a479c5 825 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 826 GvCV_set(topgv, cand_cv);
e1a479c5
BB
827 GvCVGEN(topgv) = topgen_cmp;
828 }
829 return candidate;
830 }
831 }
9607fc9c 832
e1a479c5
BB
833 /* Check UNIVERSAL without caching */
834 if(level == 0 || level == -1) {
55df6700
FC
835 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
836 flags &~GV_SUPER);
e1a479c5
BB
837 if(candidate) {
838 cand_cv = GvCV(candidate);
839 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
840 CV *old_cv = GvCV(topgv);
841 SvREFCNT_dec(old_cv);
e1a479c5 842 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 843 GvCV_set(topgv, cand_cv);
e1a479c5
BB
844 GvCVGEN(topgv) = topgen_cmp;
845 }
846 return candidate;
847 }
848 }
849
850 if (topgv && GvREFCNT(topgv) == 1) {
851 /* cache the fact that the method is not defined */
852 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW
853 }
854
79072805
LW
855 return 0;
856}
857
c6afe666 858GV *
859Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
860{
861 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
862 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
863}
864
954c1994 865/*
460e5730
FC
866=for apidoc gv_fetchmeth_autoload
867
868This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
869parameter.
870
d21989ed 871=for apidoc gv_fetchmeth_sv_autoload
611c1e95 872
d21989ed
BF
873Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
874of an SV instead of a string/length pair.
875
876=cut
877*/
878
879GV *
880Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
881{
882 char *namepv;
883 STRLEN namelen;
884 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
885 namepv = SvPV(namesv, namelen);
886 if (SvUTF8(namesv))
887 flags |= SVf_UTF8;
888 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
889}
890
891/*
892=for apidoc gv_fetchmeth_pv_autoload
893
894Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
895instead of a string/length pair.
896
897=cut
898*/
899
900GV *
901Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
902{
903 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
904 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
905}
906
907/*
908=for apidoc gv_fetchmeth_pvn_autoload
909
910Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ
911Returns a glob for the subroutine.
912
913For an autoloaded subroutine without a GV, will create a GV even
914if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
915of the result may be zero.
916
d21989ed
BF
917Currently, the only significant value for C<flags> is SVf_UTF8.
918
611c1e95
IZ
919=cut
920*/
921
922GV *
d21989ed 923Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 924{
499321d3 925 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 926
d21989ed 927 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 928
611c1e95 929 if (!gv) {
611c1e95
IZ
930 CV *cv;
931 GV **gvp;
932
933 if (!stash)
6136c704 934 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 935 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 936 return NULL;
d21989ed 937 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 938 return NULL;
611c1e95
IZ
939 cv = GvCV(gv);
940 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 941 return NULL;
611c1e95
IZ
942 /* Have an autoload */
943 if (level < 0) /* Cannot do without a stub */
d21989ed 944 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF
945 gvp = (GV**)hv_fetch(stash, name,
946 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 947 if (!gvp)
6136c704 948 return NULL;
611c1e95
IZ
949 return *gvp;
950 }
951 return gv;
952}
953
954/*
954c1994
GS
955=for apidoc gv_fetchmethod_autoload
956
957Returns the glob which contains the subroutine to call to invoke the method
958on the C<stash>. In fact in the presence of autoloading this may be the
959glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 960already setup.
954c1994
GS
961
962The third parameter of C<gv_fetchmethod_autoload> determines whether
963AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 964means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 965Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 966with a non-zero C<autoload> parameter.
954c1994 967
cec2d7b1
FC
968These functions grant C<"SUPER"> token
969as a prefix of the method name. Note
954c1994
GS
970that if you want to keep the returned glob for a long time, you need to
971check for it being "AUTOLOAD", since at the later time the call may load a
cec2d7b1
FC
972different subroutine due to $AUTOLOAD changing its value. Use the glob
973created as a side effect to do this.
954c1994 974
cec2d7b1
FC
975These functions have the same side-effects as C<gv_fetchmeth> with
976C<level==0>. The warning against passing the GV returned by
977C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS
978
979=cut
980*/
981
dc848c6f 982GV *
864dbfa3 983Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 984{
547bb267
NC
985 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
986
256d1bb2
NC
987 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
988}
989
44130a26
BF
990GV *
991Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
992{
993 char *namepv;
994 STRLEN namelen;
995 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
996 namepv = SvPV(namesv, namelen);
997 if (SvUTF8(namesv))
998 flags |= SVf_UTF8;
999 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
1000}
1001
1002GV *
1003Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1004{
1005 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1006 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1007}
1008
256d1bb2
NC
1009/* Don't merge this yet, as it's likely to get a len parameter, and possibly
1010 even a U32 hash */
1011GV *
44130a26 1012Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1013{
eb578fdb 1014 const char *nend;
c445ea15 1015 const char *nsplit = NULL;
a0d0e21e 1016 GV* gv;
0dae17bd 1017 HV* ostash = stash;
c94593d0 1018 const char * const origname = name;
ad64d0ec 1019 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
1020 const U32 autoload = flags & GV_AUTOLOAD;
1021 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1022 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1023
44130a26 1024 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1025
eff494dd 1026 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1027 stash = NULL;
c9bf4021
NC
1028 else {
1029 /* The only way stash can become NULL later on is if nsplit is set,
1030 which in turn means that there is no need for a SVt_PVHV case
1031 the error reporting code. */
1032 }
b267980d 1033
44130a26 1034 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 1035 if (*nend == '\'') {
a0d0e21e 1036 nsplit = nend;
c94593d0
NC
1037 name = nend + 1;
1038 }
1039 else if (*nend == ':' && *(nend + 1) == ':') {
1040 nsplit = nend++;
1041 name = nend + 1;
1042 }
a0d0e21e
LW
1043 }
1044 if (nsplit) {
7edbdc6b 1045 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 1046 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC
1047 stash = CopSTASH(PL_curcop);
1048 flags |= GV_SUPER;
cea2e8a9 1049 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1050 origname, HvENAME_get(stash), name) );
4633a7c4 1051 }
aae43805
FC
1052 else if ((nsplit - origname) >= 7 &&
1053 strnEQ(nsplit - 7, "::SUPER", 7)) {
1054 /* don't autovifify if ->NoSuchStash::SUPER::method */
1055 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
1056 if (stash) flags |= GV_SUPER;
1057 }
e189a56d 1058 else {
af09ea45 1059 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1060 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 1061 }
0dae17bd 1062 ostash = stash;
4633a7c4
LW
1063 }
1064
14d1dfbd 1065 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1066 if (!gv) {
2f6e0fe7 1067 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1068 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1069 else if (autoload)
c8416c26
BF
1070 gv = gv_autoload_pvn(
1071 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1072 );
256d1bb2
NC
1073 if (!gv && do_croak) {
1074 /* Right now this is exclusively for the benefit of S_method_common
1075 in pp_hot.c */
1076 if (stash) {
15e6cdd9
DG
1077 /* If we can't find an IO::File method, it might be a call on
1078 * a filehandle. If IO:File has not been loaded, try to
1079 * require it first instead of croaking */
1080 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1081 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1082 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1083 STR_WITH_LEN("IO/File.pm"), 0,
1084 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1085 ) {
31b05a0f 1086 require_pv("IO/File.pm");
14d1dfbd 1087 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG
1088 if (gv)
1089 return gv;
1090 }
256d1bb2 1091 Perl_croak(aTHX_
b17a0679 1092 "Can't locate object method \"%"UTF8f
d0c0e7dd 1093 "\" via package \"%"HEKf"\"",
b17a0679 1094 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1095 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC
1096 }
1097 else {
ecad31f0 1098 SV* packnamesv;
256d1bb2 1099
256d1bb2 1100 if (nsplit) {
ecad31f0
BF
1101 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1102 SVs_TEMP | is_utf8);
256d1bb2 1103 } else {
017c5e4e 1104 packnamesv = error_report;
256d1bb2
NC
1105 }
1106
1107 Perl_croak(aTHX_
b17a0679
FC
1108 "Can't locate object method \"%"UTF8f
1109 "\" via package \"%"SVf"\""
ecad31f0 1110 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1111 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1112 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1113 }
1114 }
463ee0b2 1115 }
dc848c6f 1116 else if (autoload) {
9d4ba2ae 1117 CV* const cv = GvCV(gv);
09280a33
CS
1118 if (!CvROOT(cv) && !CvXSUB(cv)) {
1119 GV* stubgv;
1120 GV* autogv;
1121
0c028dca 1122 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS
1123 stubgv = gv;
1124 else {
1125 stubgv = CvGV(cv);
1126 if (GvCV(stubgv) != cv) /* orphaned import */
1127 stubgv = gv;
1128 }
c8416c26
BF
1129 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1130 GvNAME(stubgv), GvNAMELEN(stubgv),
1131 GV_AUTOLOAD_ISMETHOD
1132 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1133 if (autogv)
1134 gv = autogv;
1135 }
1136 }
44a8e56a
PP
1137
1138 return gv;
1139}
1140
1141GV*
0eeb01b9 1142Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1143{
1144 char *namepv;
1145 STRLEN namelen;
0fe84f7c 1146 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1147 namepv = SvPV(namesv, namelen);
1148 if (SvUTF8(namesv))
1149 flags |= SVf_UTF8;
0eeb01b9 1150 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1151}
1152
1153GV*
0eeb01b9 1154Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1155{
0fe84f7c 1156 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1157 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1158}
1159
1160GV*
0eeb01b9 1161Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1162{
44a8e56a
PP
1163 GV* gv;
1164 CV* cv;
1165 HV* varstash;
1166 GV* vargv;
1167 SV* varsv;
c8416c26
BF
1168 SV *packname = NULL;
1169 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1170
0fe84f7c 1171 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1172
7edbdc6b 1173 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1174 return NULL;
0dae17bd
GS
1175 if (stash) {
1176 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1177 STRLEN packname_len = 0;
1178 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1179 packname = newSVpvn_flags(packname_ptr, packname_len,
1180 SVs_TEMP | SvUTF8(stash));
5c284bb0 1181 stash = NULL;
0dae17bd 1182 }
c8416c26
BF
1183 else
1184 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1185 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1186 }
257dc59d
FC
1187 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1188 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1189 return NULL;
dc848c6f
PP
1190 cv = GvCV(gv);
1191
adb5a9ae 1192 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1193 return NULL;
ed850460 1194
dc848c6f
PP
1195 /*
1196 * Inheriting AUTOLOAD for non-methods works ... for now.
1197 */
0eeb01b9
FC
1198 if (
1199 !(flags & GV_AUTOLOAD_ISMETHOD)
1200 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1201 )
d1d15184 1202 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC
1203 "Use of inherited AUTOLOAD for non-method %"SVf
1204 "::%"UTF8f"() is deprecated",
ecad31f0 1205 SVfARG(packname),
b17a0679 1206 UTF8fARG(is_utf8, len, name));
44a8e56a 1207
aed2304a 1208 if (CvISXSUB(cv)) {
bb619f37
FC
1209 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1210 * and split that value on the last '::', pass along the same data
1211 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC
1212 *
1213 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1214 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC
1215 * type. Since SvPVX has been documented as returning the sub name
1216 * for a long time, but not as returning the prototype, we have
1217 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1218 * elsewhere.
1219 *
1220 * We put the prototype in the same allocated buffer, but after
1221 * the sub name. The SvPOK flag indicates the presence of a proto-
1222 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1223 * If both flags are on, then SvLEN is used to indicate the end of
1224 * the prototype (artificially lower than what is actually allo-
1225 * cated), at the risk of having to reallocate a few bytes unneces-
1226 * sarily--but that should happen very rarely, if ever.
1227 *
1228 * We use SvUTF8 for both prototypes and sub names, so if one is
1229 * UTF8, the other must be upgraded.
adb5a9ae 1230 */
c68d9564 1231 CvSTASH_set(cv, stash);
8fa6a409 1232 if (SvPOK(cv)) { /* Ouch! */
e7881358 1233 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC
1234 STRLEN ulen;
1235 const char *proto = CvPROTO(cv);
1236 assert(proto);
1237 if (SvUTF8(cv))
1238 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1239 ulen = SvCUR(tmpsv);
1240 SvCUR(tmpsv)++; /* include null in string */
1241 sv_catpvn_flags(
1242 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1243 );
1244 SvTEMP_on(tmpsv); /* Allow theft */
1245 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1246 SvTEMP_off(tmpsv);
e7881358 1247 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC
1248 SvLEN(cv) = SvCUR(cv) + 1;
1249 SvCUR(cv) = ulen;
1250 }
1251 else {
1252 sv_setpvn((SV *)cv, name, len);
1253 SvPOK_off(cv);
1254 if (is_utf8)
c8416c26 1255 SvUTF8_on(cv);
8fa6a409
FC
1256 else SvUTF8_off(cv);
1257 }
1258 CvAUTOLOAD_on(cv);
adb5a9ae 1259 }
adb5a9ae 1260
44a8e56a
PP
1261 /*
1262 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1263 * The subroutine's original name may not be "AUTOLOAD", so we don't
1264 * use that, but for lack of anything better we will use the sub's
1265 * original package to look up $AUTOLOAD.
1266 */
18691622 1267 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1268 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1269 ENTER;
1270
c69033f2 1271 if (!isGV(vargv)) {
04ec7e59 1272 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1273#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1274 GvSV(vargv) = newSV(0);
c69033f2
NC
1275#endif
1276 }
3d35f11b 1277 LEAVE;
e203899d 1278 varsv = GvSVn(vargv);
4bac9ae4
CS
1279 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1280 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1281 sv_setsv(varsv, packname);
396482e1 1282 sv_catpvs(varsv, "::");
d40bf27b
NC
1283 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1284 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC
1285 sv_catpvn_flags(
1286 varsv, name, len,
5bcd1ef4 1287 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1288 );
c8416c26
BF
1289 if (is_utf8)
1290 SvUTF8_on(varsv);
a0d0e21e
LW
1291 return gv;
1292}
1293
44a2ac75
YO
1294
1295/* require_tie_mod() internal routine for requiring a module
486ec47a 1296 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO
1297 *
1298 * The "gv" parameter should be the glob.
45cbc99a
RGS
1299 * "varpv" holds the name of the var, used for error messages.
1300 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1301 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS
1302 * are working reasonably close to as expected.
1303 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1304 * For the protection of $! to work (it is set by this routine)
1305 * the sv slot must already be magicalized.
d2c93421 1306 */
44a2ac75
YO
1307STATIC HV*
1308S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1309{
da51bb9b 1310 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1311
7918f24d
NC
1312 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1313
0ea03996 1314 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS
1315 SV *module = newSVsv(namesv);
1316 char varname = *varpv; /* varpv might be clobbered by load_module,
1317 so save it. For the moment it's always
1318 a single char. */
b82b06b8 1319 const char type = varname == '[' ? '$' : '%';
61bac25c 1320#ifdef DEBUGGING
d2c93421 1321 dSP;
61bac25c 1322#endif
d2c93421 1323 ENTER;
600beb2e 1324 SAVEFREESV(namesv);
44a2ac75 1325 if ( flags & 1 )
45cbc99a
RGS
1326 save_scalar(gv);
1327 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1328 assert(sp == PL_stack_sp);
da51bb9b 1329 stash = gv_stashsv(namesv, 0);
44a2ac75 1330 if (!stash)
b82b06b8
FC
1331 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1332 type, varname, SVfARG(namesv));
45cbc99a 1333 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC
1334 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1335 type, varname, SVfARG(namesv), methpv);
600beb2e 1336 LEAVE;
d2c93421 1337 }
e7881358 1338 else SvREFCNT_dec_NN(namesv);
44a2ac75 1339 return stash;
d2c93421
RH
1340}
1341
954c1994
GS
1342/*
1343=for apidoc gv_stashpv
1344
da51bb9b 1345Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1346determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1347
1348=cut
1349*/
1350
a0d0e21e 1351HV*
864dbfa3 1352Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1353{
7918f24d 1354 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1355 return gv_stashpvn(name, strlen(name), create);
1356}
1357
bc96cb06
SH
1358/*
1359=for apidoc gv_stashpvn
1360
da51bb9b
NC
1361Returns a pointer to the stash for a specified package. The C<namelen>
1362parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1363to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1364created if it does not already exist. If the package does not exist and
1365C<flags> is 0 (or any other setting that does not create packages) then NULL
1366is returned.
1367
566a4718
YO
1368Flags may be one of:
1369
1370 GV_ADD
1371 SVf_UTF8
1372 GV_NOADD_NOINIT
1373 GV_NOINIT
1374 GV_NOEXPAND
1375 GV_ADDMG
1376
1377The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06 1378
808724c8 1379Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1380recommended for performance reasons.
1381
bc96cb06
SH
1382=cut
1383*/
1384
0eadbdad
YO
1385/*
1386gv_stashpvn_internal
1387
1388Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1389as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1390
1391*/
1392
4e7ebec5 1393PERL_STATIC_INLINE HV*
0eadbdad 1394S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1395{
0cea0058 1396 char smallbuf[128];
46fc3d4c 1397 char *tmpbuf;
a0d0e21e
LW
1398 HV *stash;
1399 GV *tmpgv;
add0ecde 1400 U32 tmplen = namelen + 2;
dc437b57 1401
0eadbdad 1402 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1403
add0ecde 1404 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1405 tmpbuf = smallbuf;
1406 else
add0ecde
VP
1407 Newx(tmpbuf, tmplen, char);
1408 Copy(name, tmpbuf, namelen, char);
1409 tmpbuf[namelen] = ':';
1410 tmpbuf[namelen+1] = ':';
1411 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1412 if (tmpbuf != smallbuf)
1413 Safefree(tmpbuf);
d2fcb1d6 1414 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1415 return NULL;
a0d0e21e 1416 stash = GvHV(tmpgv);
1f656fcf 1417 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1418 assert(stash);
1f656fcf 1419 if (!HvNAME_get(stash)) {
0be4d16f 1420 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1421
1422 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1423 /* If the containing stash has multiple effective
1424 names, see that this one gets them, too. */
1425 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1426 mro_package_moved(stash, NULL, tmpgv, 1);
1427 }
a0d0e21e 1428 return stash;
463ee0b2
LW
1429}
1430
808724c8 1431/*
1432gv_stashsvpvn_cached
1433
1434Returns a pointer to the stash for a specified package, possibly
1435cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1436
1437Requires one of either namesv or namepv to be non-null.
1438
1439See C<gv_stashpvn> for details on "flags".
1440
1441Note the sv interface is strongly preferred for performance reasons.
1442
1443*/
1444
1445#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1446 assert(namesv || name)
1447
1448PERL_STATIC_INLINE HV*
1449S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1450{
1451 HV* stash;
808724c8 1452 HE* he;
1453
1454 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1455
1456 he = (HE *)hv_common(
1457 PL_stashcache, namesv, name, namelen,
4e7ebec5 1458 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1459 );
808724c8 1460
4e7ebec5 1461 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1462 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1463
808724c8 1464 if (namesv) {
1465 if (SvOK(namesv)) { /* prevent double uninit warning */
1466 STRLEN len;
1467 name = SvPV_const(namesv, len);
1468 namelen = len;
1469 flags |= SvUTF8(namesv);
1470 } else {
1471 name = ""; namelen = 0;
1472 }
1473 }
0eadbdad
YO
1474 stash = gv_stashpvn_internal(name, namelen, flags);
1475
4e7ebec5 1476 if (stash && namelen) {
1477 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1478 (void)hv_store(PL_stashcache, name,
4e7ebec5 1479 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1480 }
808724c8 1481
4e7ebec5 1482 return stash;
1483}
1484
808724c8 1485HV*
1486Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1487{
1488 PERL_ARGS_ASSERT_GV_STASHPVN;
1489 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1490}
1491
954c1994
GS
1492/*
1493=for apidoc gv_stashsv
1494
da51bb9b 1495Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994 1496
808724c8 1497Note this interface is strongly preferred over C<gv_stashpvn> for performance reasons.
1498
954c1994
GS
1499=cut
1500*/
1501
a0d0e21e 1502HV*
da51bb9b 1503Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1504{
7918f24d 1505 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1506 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW
1507}
1508
1509
463ee0b2 1510GV *
fe9845cc 1511Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1512 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1513 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1514}
1515
1516GV *
fe9845cc 1517Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1518 STRLEN len;
77cb3b01
FC
1519 const char * const nambeg =
1520 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1521 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1522 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1523}
1524
90aeefb4 1525PERL_STATIC_INLINE void
290a1700 1526S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1527{
1528 AV* av;
1529
1530 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1531
1532 av = GvAVn(gv);
1533 GvMULTI_on(gv);
1534 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1535 NULL, 0);
ad7cce9f
FR
1536}
1537
90aeefb4
BF
1538/* This function grabs name and tries to split a stash and glob
1539 * from its contents. TODO better description, comments
1540 *
1541 * If the function returns TRUE and 'name == name_end', then
1542 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1543 */
1544PERL_STATIC_INLINE bool
1545S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1546 STRLEN *len, const char *nambeg, STRLEN full_len,
1547 const U32 is_utf8, const I32 add)
1548{
1549 const char *name_cursor;
1550 const char *const name_end = nambeg + full_len;
1551 const char *const name_em1 = name_end - 1;
1552
1553 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1554
1555 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1556 /* accidental stringify on a GV? */
1557 (*name)++;
1558 }
1559
1560 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1561 if (name_cursor < name_em1 &&
1562 ((*name_cursor == ':' && name_cursor[1] == ':')
1563 || *name_cursor == '\''))
1564 {
1565 if (!*stash)
1566 *stash = PL_defstash;
1567 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1568 return FALSE;
1569
1570 *len = name_cursor - *name;
1571 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1572 const char *key;
1573 GV**gvp;
1574 if (*name_cursor == ':') {
1575 key = *name;
1576 *len += 2;
1577 }
1578 else {
1579 char *tmpbuf;
1580 Newx(tmpbuf, *len+2, char);
1581 Copy(*name, tmpbuf, *len, char);
1582 tmpbuf[(*len)++] = ':';
1583 tmpbuf[(*len)++] = ':';
1584 key = tmpbuf;
1585 }
c161da64 1586 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF
1587 *gv = gvp ? *gvp : NULL;
1588 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1589 if (SvTYPE(*gv) != SVt_PVGV)
1590 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1591 else
1592 GvMULTI_on(*gv);
1593 }
1594 if (key != *name)
1595 Safefree(key);
1596 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1597 return FALSE;
1598
1599 if (!(*stash = GvHV(*gv))) {
1600 *stash = GvHV(*gv) = newHV();
1601 if (!HvNAME_get(*stash)) {
1602 if (GvSTASH(*gv) == PL_defstash && *len == 6
1603 && strnEQ(*name, "CORE", 4))
1604 hv_name_set(*stash, "CORE", 4, 0);
1605 else
1606 hv_name_set(
1607 *stash, nambeg, name_cursor-nambeg, is_utf8
1608 );
1609 /* If the containing stash has multiple effective
1610 names, see that this one gets them, too. */
1611 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1612 mro_package_moved(*stash, NULL, *gv, 1);
1613 }
1614 }
1615 else if (!HvNAME_get(*stash))
1616 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1617 }
1618
1619 if (*name_cursor == ':')
1620 name_cursor++;
1621 *name = name_cursor+1;
1622 if (*name == name_end) {
1623 if (!*gv)
1624 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1625 return TRUE;
1626 }
1627 }
1628 }
1629 *len = name_cursor - *name;
1630 return TRUE;
1631}
1632
536d1a88 1633/* Checks if an unqualified name is in the main stash */
90aeefb4 1634PERL_STATIC_INLINE bool
536d1a88 1635S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1636{
536d1a88 1637 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1638
90aeefb4 1639 /* If it's an alphanumeric variable */
536d1a88 1640 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF
1641 /* Some "normal" variables are always in main::,
1642 * like INC or STDOUT.
1643 */
1644 switch (len) {
1645 case 1:
1646 if (*name == '_')
536d1a88 1647 return TRUE;
90aeefb4
BF
1648 break;
1649 case 3:
1650 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1651 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1652 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1653 return TRUE;
90aeefb4
BF
1654 break;
1655 case 4:
1656 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1657 && name[3] == 'V')
536d1a88 1658 return TRUE;
90aeefb4
BF
1659 break;
1660 case 5:
1661 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1662 && name[3] == 'I' && name[4] == 'N')
536d1a88 1663 return TRUE;
90aeefb4
BF
1664 break;
1665 case 6:
1666 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1667 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1668 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1669 return TRUE;
90aeefb4
BF
1670 break;
1671 case 7:
1672 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1673 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1674 && name[6] == 'T')
536d1a88 1675 return TRUE;
90aeefb4
BF
1676 break;
1677 }
536d1a88
BF
1678 }
1679 /* *{""}, or a special variable like $@ */
1680 else
1681 return TRUE;
1682
1683 return FALSE;
1684}
1685
1686
1687/* This function is called if parse_gv_stash_name() failed to
1688 * find a stash, or if GV_NOTQUAL or an empty name was passed
1689 * to gv_fetchpvn_flags.
1690 *
1691 * It returns FALSE if the default stash can't be found nor created,
1692 * which might happen during global destruction.
1693 */
1694PERL_STATIC_INLINE bool
1695S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1696 const U32 is_utf8, const I32 add,
1697 const svtype sv_type)
1698{
1699 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1700
1701 /* No stash in name, so see how we can default */
90aeefb4 1702
536d1a88
BF
1703 if ( gv_is_in_main(name, len, is_utf8) ) {
1704 *stash = PL_defstash;
1705 }
1706 else {
1707 if (IN_PERL_COMPILETIME) {
90aeefb4
BF
1708 *stash = PL_curstash;
1709 if (add && (PL_hints & HINT_STRICT_VARS) &&
1710 sv_type != SVt_PVCV &&
1711 sv_type != SVt_PVGV &&
1712 sv_type != SVt_PVFM &&
1713 sv_type != SVt_PVIO &&
1714 !(len == 1 && sv_type == SVt_PV &&
1715 (*name == 'a' || *name == 'b')) )
1716 {
c161da64 1717 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF
1718 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1719 SvTYPE(*gvp) != SVt_PVGV)
1720 {
1721 *stash = NULL;
1722 }
1723 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1724 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1725 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1726 {
1727 /* diag_listed_as: Variable "%s" is not imported%s */
1728 Perl_ck_warner_d(
1729 aTHX_ packWARN(WARN_MISC),
1730 "Variable \"%c%"UTF8f"\" is not imported",
1731 sv_type == SVt_PVAV ? '@' :
1732 sv_type == SVt_PVHV ? '%' : '$',
1733 UTF8fARG(is_utf8, len, name));
1734 if (GvCVu(*gvp))
1735 Perl_ck_warner_d(
1736 aTHX_ packWARN(WARN_MISC),
1737 "\t(Did you mean &%"UTF8f" instead?)\n",
1738 UTF8fARG(is_utf8, len, name)
1739 );
1740 *stash = NULL;
1741 }
1742 }
1743 }
1744 else {
1745 /* Use the current op's stash */
1746 *stash = CopSTASH(PL_curcop);
1747 }
1748 }
90aeefb4
BF
1749
1750 if (!*stash) {
1751 if (add && !PL_in_clean_all) {
10860bf4
FC
1752 GV *gv;
1753 qerror(Perl_mess(aTHX_
90aeefb4 1754 "Global symbol \"%s%"UTF8f
d8c6310a
FC
1755 "\" requires explicit package name (did you forget to "
1756 "declare \"my %s%"UTF8f"\"?)",
1757 (sv_type == SVt_PV ? "$"
1758 : sv_type == SVt_PVAV ? "@"
1759 : sv_type == SVt_PVHV ? "%"
1760 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF
1761 (sv_type == SVt_PV ? "$"
1762 : sv_type == SVt_PVAV ? "@"
1763 : sv_type == SVt_PVHV ? "%"
10860bf4 1764 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF
1765 /* To maintain the output of errors after the strict exception
1766 * above, and to keep compat with older releases, rather than
1767 * placing the variables in the pad, we place
1768 * them in the <none>:: stash.
1769 */
90aeefb4
BF
1770 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1771 if (!gv) {
1772 /* symbol table under destruction */
1773 return FALSE;
1774 }
1775 *stash = GvHV(gv);
1776 }
1777 else
1778 return FALSE;
1779 }
1780
1781 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1782 return FALSE;
1783
1784 return TRUE;
1785}
1786
8c995aba
FC
1787/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1788 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1789 this file. */
1790#undef SvREADONLY_on
1791#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1792
930867a8
BF
1793/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1794 * a new GV.
1795 * Note that it does not insert the GV into the stash prior to
1796 * magicalization, which some variables require need in order
1797 * to work (like $[, %+, %-, %!), so callers must take care of
1798 * that beforehand.
1799 *
1800 * The return value has a specific meaning for gv_fetchpvn_flags:
1801 * If it returns true, and the gv is empty, it indicates that its
1802 * refcount should be decreased.
1803 */
1804PERL_STATIC_INLINE bool
1805S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1806 bool addmg, const svtype sv_type)
79072805 1807{
960b831f 1808 SSize_t paren;
79072805 1809
930867a8 1810 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1811
44428a46 1812 if (stash != PL_defstash) { /* not the main stash */
ea238638 1813 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC
1814 and VERSION. All the others apply only to the main stash or to
1815 CORE (which is checked right after this). */
ea238638 1816 if (len) {
b464bac0 1817 const char * const name2 = name + 1;
cc4c2da6 1818 switch (*name) {
cc4c2da6
NC
1819 case 'E':
1820 if (strnEQ(name2, "XPORT", 5))
1821 GvMULTI_on(gv);
1822 break;
1823 case 'I':
44428a46 1824 if (strEQ(name2, "SA"))
290a1700 1825 gv_magicalize_isa(gv);
cc4c2da6 1826 break;
44428a46
FC
1827 case 'V':
1828 if (strEQ(name2, "ERSION"))
1829 GvMULTI_on(gv);
1830 break;
ea238638
FC
1831 case 'a':
1832 case 'b':
1833 if (len == 1 && sv_type == SVt_PV)
1834 GvMULTI_on(gv);
924ba076 1835 /* FALLTHROUGH */
4aaa4757
FC
1836 default:
1837 goto try_core;
1838 }
930867a8 1839 return addmg;
4aaa4757
FC
1840 }
1841 try_core:
1842 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1843 /* Avoid null warning: */
1844 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC
1845 if (strnEQ(stashname, "CORE", 4))
1846 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC
1847 }
1848 }
1849 else if (len > 1) {
1850#ifndef EBCDIC
1851 if (*name > 'V' ) {
1852 NOOP;
1853 /* Nothing else to do.
1854 The compiler will probably turn the switch statement into a
1855 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW
1856 the common case of lower case variable names. (On EBCDIC
1857 platforms, we can't just do:
1858 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1859 because cases like '\027' in the switch statement below are
1860 C1 (non-ASCII) controls on those platforms, so the remapping
1861 would make them larger than 'V')
1862 */
44428a46
FC
1863 } else
1864#endif
1865 {
3e669301 1866 const char * name2 = name + 1;
44428a46
FC
1867 switch (*name) {
1868 case 'A':
1869 if (strEQ(name2, "RGV")) {
1870 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1871 }
1872 else if (strEQ(name2, "RGVOUT")) {
1873 GvMULTI_on(gv);
1874 }
1875 break;
1876 case 'E':
1877 if (strnEQ(name2, "XPORT", 5))
1878 GvMULTI_on(gv);
1879 break;
1880 case 'I':
1881 if (strEQ(name2, "SA")) {
290a1700 1882 gv_magicalize_isa(gv);
44428a46
FC
1883 }
1884 break;
cc4c2da6
NC
1885 case 'S':
1886 if (strEQ(name2, "IG")) {
1887 HV *hv;
1888 I32 i;
d525a7b2
NC
1889 if (!PL_psig_name) {
1890 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1891 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1892 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1893 } else {
1894 /* I think that the only way to get here is to re-use an
1895 embedded perl interpreter, where the previous
1896 use didn't clean up fully because
1897 PL_perl_destruct_level was 0. I'm not sure that we
1898 "support" that, in that I suspect in that scenario
1899 there are sufficient other garbage values left in the
1900 interpreter structure that something else will crash
1901 before we get here. I suspect that this is one of
1902 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1903 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1904 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
1905 }
1906 GvMULTI_on(gv);
1907 hv = GvHVn(gv);
a0714e2c 1908 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1909 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1910 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
1911 if (init)
1912 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
1913 }
1914 }
1915 break;
1916 case 'V':
1917 if (strEQ(name2, "ERSION"))
1918 GvMULTI_on(gv);
1919 break;
e5218da5
GA
1920 case '\003': /* $^CHILD_ERROR_NATIVE */
1921 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1922 goto magicalize;
1923 break;
cc4c2da6 1924 case '\005': /* $^ENCODING */
3e669301
KW
1925 if (*name2 == '_') {
1926 name2++;
1927 }
cc4c2da6
NC
1928 if (strEQ(name2, "NCODING"))
1929 goto magicalize;
1930 break;
9ebf26ad
FR
1931 case '\007': /* $^GLOBAL_PHASE */
1932 if (strEQ(name2, "LOBAL_PHASE"))
1933 goto ro_magicalize;
1934 break;
8561ea1d
FC
1935 case '\014': /* $^LAST_FH */
1936 if (strEQ(name2, "AST_FH"))
1937 goto ro_magicalize;
1938 break;
cde0cee5 1939 case '\015': /* $^MATCH */
960b831f
NC
1940 if (strEQ(name2, "ATCH")) {
1941 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1942 goto storeparen;
1943 }
66230c86 1944 break;
cc4c2da6
NC
1945 case '\017': /* $^OPEN */
1946 if (strEQ(name2, "PEN"))
1947 goto magicalize;
1948 break;
cde0cee5 1949 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC
1950 if (strEQ(name2, "REMATCH")) {
1951 paren = RX_BUFF_IDX_CARET_PREMATCH;
1952 goto storeparen;
1953 }
1954 if (strEQ(name2, "OSTMATCH")) {
1955 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1956 goto storeparen;
1957 }
9ebf26ad 1958 break;
cc4c2da6
NC
1959 case '\024': /* ${^TAINT} */
1960 if (strEQ(name2, "AINT"))
1961 goto ro_magicalize;
1962 break;
7cebcbc0 1963 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1964 if (strEQ(name2, "NICODE"))
cc4c2da6 1965 goto ro_magicalize;
a0288114 1966 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1967 goto ro_magicalize;
e07ea26a
NC
1968 if (strEQ(name2, "TF8CACHE"))
1969 goto magicalize;
cc4c2da6
NC
1970 break;
1971 case '\027': /* $^WARNING_BITS */
1972 if (strEQ(name2, "ARNING_BITS"))
1973 goto magicalize;
1974 break;
1975 case '1':
1976 case '2':
1977 case '3':
1978 case '4':
1979 case '5':
1980 case '6':
1981 case '7':
1982 case '8':
1983 case '9':
85e6fe83 1984 {
2fdbfb4d
AB
1985 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1986 this test */
22ff3130
HS
1987 UV uv;
1988 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1989 return addmg;
1990 /* XXX why are we using a SSize_t? */
1991 paren = (SSize_t)(I32)uv;
960b831f 1992 goto storeparen;
1d7c1841 1993 }
dc437b57 1994 }
93a17b20 1995 }
392db708
NC
1996 } else {
1997 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1998 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1999 switch (*name) {
6361f656 2000 case '&': /* $& */
960b831f
NC
2001 paren = RX_BUFF_IDX_FULLMATCH;
2002 goto sawampersand;
6361f656 2003 case '`': /* $` */
960b831f
NC
2004 paren = RX_BUFF_IDX_PREMATCH;
2005 goto sawampersand;
6361f656 2006 case '\'': /* $' */
960b831f
NC
2007 paren = RX_BUFF_IDX_POSTMATCH;
2008 sawampersand:
1a904fc8 2009#ifdef PERL_SAWAMPERSAND
a289ef89 2010 if (!(
cc4c2da6
NC
2011 sv_type == SVt_PVAV ||
2012 sv_type == SVt_PVHV ||
2013 sv_type == SVt_PVCV ||
2014 sv_type == SVt_PVFM ||
2015 sv_type == SVt_PVIO
d3b97530
DM
2016 )) { PL_sawampersand |=
2017 (*name == '`')
2018 ? SAWAMPERSAND_LEFT
2019 : (*name == '&')
2020 ? SAWAMPERSAND_MIDDLE
2021 : SAWAMPERSAND_RIGHT;
2022 }
1a904fc8 2023#endif
960b831f 2024 goto storeparen;
e91d8259
NC
2025 case '1': /* $1 */
2026 case '2': /* $2 */
2027 case '3': /* $3 */
2028 case '4': /* $4 */
2029 case '5': /* $5 */
2030 case '6': /* $6 */
2031 case '7': /* $7 */
2032 case '8': /* $8 */
2033 case '9': /* $9 */
960b831f
NC
2034 paren = *name - '0';
2035
2036 storeparen:
e91d8259
NC
2037 /* Flag the capture variables with a NULL mg_ptr
2038 Use mg_len for the array index to lookup. */
960b831f 2039 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2040 break;
cc4c2da6 2041
6361f656 2042 case ':': /* $: */
c69033f2 2043 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
2044 goto magicalize;
2045
6361f656 2046 case '?': /* $? */
ff0cee69 2047#ifdef COMPLEX_STATUS
c69033f2 2048 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2049#endif
cc4c2da6 2050 goto magicalize;
ff0cee69 2051
6361f656 2052 case '!': /* $! */
67261566 2053 GvMULTI_on(gv);
44a2ac75 2054 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2055
ad64d0ec 2056 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2057
44a2ac75 2058 /* magicalization must be done before require_tie_mod is called */
67261566 2059 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 2060 {
44a2ac75 2061 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 2062 addmg = FALSE;
ffdb8bcd 2063 }
d2c93421 2064
6cef1e77 2065 break;
6361f656
AB
2066 case '-': /* $- */
2067 case '+': /* $+ */
44a2ac75
YO
2068 GvMULTI_on(gv); /* no used once warnings here */
2069 {
44a2ac75 2070 AV* const av = GvAVn(gv);
ad64d0ec 2071 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2072
ad64d0ec
NC
2073 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2074 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2075 if (avc)
44a2ac75 2076 SvREADONLY_on(GvSVn(gv));
44a2ac75 2077 SvREADONLY_on(av);
67261566
YO
2078
2079 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 2080 {
192b9cd1 2081 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 2082 addmg = FALSE;
213084e4 2083 }
67261566 2084
80305961 2085 break;
cc4c2da6 2086 }
6361f656
AB
2087 case '*': /* $* */
2088 case '#': /* $# */
9b387841 2089 if (sv_type == SVt_PV)
4f650b80 2090 /* diag_listed_as: $* is no longer supported */
9b387841 2091 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2092 "$%c is no longer supported", *name);
8ae1fe26 2093 break;
b3ca2e83
NC
2094 case '\010': /* $^H */
2095 {
2096 HV *const hv = GvHVn(gv);
2097 hv_magic(hv, NULL, PERL_MAGIC_hints);
2098 }
2099 goto magicalize;
b82b06b8 2100 case '[': /* $[ */
7d69d4a6 2101 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2102 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 2103 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 2104 addmg = FALSE;
b82b06b8 2105 }
7d69d4a6 2106 else goto magicalize;
b82b06b8 2107 break;
cc4c2da6 2108 case '\023': /* $^S */
2fdbfb4d
AB
2109 ro_magicalize:
2110 SvREADONLY_on(GvSVn(gv));
924ba076 2111 /* FALLTHROUGH */
6361f656 2112 case '0': /* $0 */
6361f656
AB
2113 case '^': /* $^ */
2114 case '~': /* $~ */
2115 case '=': /* $= */
2116 case '%': /* $% */
2117 case '.': /* $. */
2118 case '(': /* $( */
2119 case ')': /* $) */
2120 case '<': /* $< */
2121 case '>': /* $> */
2122 case '\\': /* $\ */
2123 case '/': /* $/ */
4505a31f 2124 case '|': /* $| */
9cdac2a2 2125 case '$': /* $$ */
cc4c2da6
NC
2126 case '\001': /* $^A */
2127 case '\003': /* $^C */
2128 case '\004': /* $^D */
2129 case '\005': /* $^E */
2130 case '\006': /* $^F */
cc4c2da6
NC
2131 case '\011': /* $^I, NOT \t in EBCDIC */
2132 case '\016': /* $^N */
2133 case '\017': /* $^O */
2134 case '\020': /* $^P */
2135 case '\024': /* $^T */
2136 case '\027': /* $^W */
2137 magicalize:
ad64d0ec 2138 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2139 break;
e521374c 2140
cc4c2da6 2141 case '\014': /* $^L */
76f68e9b 2142 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2143 break;
6361f656 2144 case ';': /* $; */
76f68e9b 2145 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2146 break;
6361f656 2147 case ']': /* $] */
cc4c2da6 2148 {
3638bf15 2149 SV * const sv = GvSV(gv);
d7aa5382 2150 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2151 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
2152 GvSV(gv) = vnumify(PL_patchlevel);
2153 SvREADONLY_on(GvSV(gv));
2154 SvREFCNT_dec(sv);
93a17b20
LW
2155 }
2156 break;
cc4c2da6
NC
2157 case '\026': /* $^V */
2158 {
3638bf15 2159 SV * const sv = GvSV(gv);
f9be5ac8
DM
2160 GvSV(gv) = new_version(PL_patchlevel);
2161 SvREADONLY_on(GvSV(gv));
2162 SvREFCNT_dec(sv);
16070b82
GS
2163 }
2164 break;
ea238638
FC
2165 case 'a':
2166 case 'b':
dc3e91f6 2167 if (sv_type == SVt_PV)
ea238638 2168 GvMULTI_on(gv);
cc4c2da6 2169 }
79072805 2170 }
930867a8
BF
2171
2172 return addmg;
71c35c05
BF
2173}
2174
8c995aba
FC
2175/* If we do ever start using this later on in the file, we need to make
2176 sure we don’t accidentally use the wrong definition. */
2177#undef SvREADONLY_on
2178
070dc475
BF
2179/* This function is called when the stash already holds the GV of the magic
2180 * variable we're looking for, but we need to check that it has the correct
2181 * kind of magic. For example, if someone first uses $! and then %!, the
2182 * latter would end up here, and we add the Errno tie to the HASH slot of
2183 * the *! glob.
2184 */
2185PERL_STATIC_INLINE void
2186S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2187{
2188 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2189
2190 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2191 if (*name == '!')
2192 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2193 else if (*name == '-' || *name == '+')
2194 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2195 } else if (sv_type == SVt_PV) {
2196 if (*name == '*' || *name == '#') {
2197 /* diag_listed_as: $* is no longer supported */
2198 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2199 WARN_SYNTAX),
2200 "$%c is no longer supported", *name);
2201 }
2202 }
2203 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2204 switch (*name) {
2205 case '[':
2206 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2207 break;
2208#ifdef PERL_SAWAMPERSAND
2209 case '`':
2210 PL_sawampersand |= SAWAMPERSAND_LEFT;
2211 (void)GvSVn(gv);
2212 break;
2213 case '&':
2214 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2215 (void)GvSVn(gv);
2216 break;
2217 case '\'':
2218 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2219 (void)GvSVn(gv);
2220 break;
2221#endif
2222 }
2223 }
2224}
2225
71c35c05
BF
2226GV *
2227Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2228 const svtype sv_type)
2229{
71c35c05
BF
2230 const char *name = nambeg;
2231 GV *gv = NULL;
2232 GV**gvp;
2233 STRLEN len;
2234 HV *stash = NULL;
2235 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2236 const I32 no_expand = flags & GV_NOEXPAND;
2237 const I32 add = flags & ~GV_NOADD_MASK;
2238 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2239 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF
2240 const char *const name_end = nambeg + full_len;
2241 U32 faking_it;
2242
2243 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2244
2245 /* If we have GV_NOTQUAL, the caller promised that
2246 * there is no stash, so we can skip the check.
2247 * Similarly if full_len is 0, since then we're
2248 * dealing with something like *{""} or ""->foo()
2249 */
2250 if ((flags & GV_NOTQUAL) || !full_len) {
2251 len = full_len;
2252 }
2253 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2254 if (name == name_end) return gv;
2255 }
2256 else {
2257 return NULL;
2258 }
2259
2260 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2261 return NULL;
2262 }
2263
2264 /* By this point we should have a stash and a name */
c161da64 2265 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF
2266 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2267 if (addmg) gv = (GV *)newSV(0);
2268 else return NULL;
2269 }
2270 else gv = *gvp, addmg = 0;
2271 /* From this point on, addmg means gv has not been inserted in the
2272 symtab yet. */
2273
2274 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF
2275 /* The GV already exists, so return it, but check if we need to do
2276 * anything else with it before that.
2277 */
71c35c05 2278 if (add) {
c002ae9a
BF
2279 /* This is the heuristic that handles if a variable triggers the
2280 * 'used only once' warning. If there's already a GV in the stash
2281 * with this name, then we assume that the variable has been used
2282 * before and turn its MULTI flag on.
2283 * It's a heuristic because it can easily be "tricked", like with
2284 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2285 * not warning about $main::foo being used just once
2286 */
71c35c05
BF
2287 GvMULTI_on(gv);
2288 gv_init_svtype(gv, sv_type);
2289 /* You reach this path once the typeglob has already been created,
2290 either by the same or a different sigil. If this path didn't
2291 exist, then (say) referencing $! first, and %! second would
2292 mean that %! was not handled correctly. */
2293 if (len == 1 && stash == PL_defstash) {
070dc475 2294 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF
2295 }
2296 else if (len == 3 && sv_type == SVt_PVAV
2297 && strnEQ(name, "ISA", 3)
2298 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2299 gv_magicalize_isa(gv);
2300 }
2301 return gv;
2302 } else if (no_init) {
2303 assert(!addmg);
2304 return gv;
c002ae9a
BF
2305 }
2306 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2307 * don't expand it to a glob. This is an optimization so that things
2308 * copying constants over, like Exporter, don't have to be rewritten
2309 * to take into account that you can store more than just globs in
2310 * stashes.
2311 */
2312 else if (no_expand && SvROK(gv)) {
71c35c05
BF
2313 assert(!addmg);
2314 return gv;
2315 }
2316
2317 /* Adding a new symbol.
2318 Unless of course there was already something non-GV here, in which case
2319 we want to behave as if there was always a GV here, containing some sort
2320 of subroutine.
2321 Otherwise we run the risk of creating things like GvIO, which can cause
2322 subtle bugs. eg the one that tripped up SQL::Translator */
2323
2324 faking_it = SvOK(gv);
2325
2326 if (add & GV_ADDWARN)
2327 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2328 "Had to create %"UTF8f" unexpectedly",
2329 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2330 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2331
9e5de6ae 2332 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF
2333 GvMULTI_on(gv) ;
2334
930867a8
BF
2335 /* First, store the gv in the symtab if we're adding magic,
2336 * but only for non-empty GVs
2337 */
2338#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2339 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2340
2341 if ( addmg && !GvEMPTY(gv) ) {
2342 (void)hv_store(stash,name,len,(SV *)gv,0);
2343 }
2344
71c35c05 2345 /* set up magic where warranted */
930867a8
BF
2346 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2347 /* See 23496c6 */
2348 if (GvEMPTY(gv)) {
2349 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2350 /* The GV was and still is "empty", except that now
2351 * it has the magic flags turned on, so we want it
2352 * stored in the symtab.
2353 */
2354 (void)hv_store(stash,name,len,(SV *)gv,0);
2355 }
2356 else {
2357 /* Most likely the temporary GV created above */
2358 SvREFCNT_dec_NN(gv);
2359 gv = NULL;
2360 }
2361 }
2362 }
71c35c05 2363
e6066781 2364 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2365 return gv;
79072805
LW
2366}
2367
2368void
35a4481c 2369Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2370{
ed60a868 2371 const char *name;
35a4481c 2372 const HV * const hv = GvSTASH(gv);
7918f24d
NC
2373
2374 PERL_ARGS_ASSERT_GV_FULLNAME4;
2375
666ea192 2376 sv_setpv(sv, prefix ? prefix : "");
a0288114 2377
52a6327b 2378 if (hv && (name = HvNAME(hv))) {
ed60a868
FC
2379 const STRLEN len = HvNAMELEN(hv);
2380 if (keepmain || strnNE(name, "main", len)) {
2381 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2382 sv_catpvs(sv,"::");
ed60a868 2383 }
43693395 2384 }
ed60a868 2385 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2386 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2387}
2388
2389void
35a4481c 2390Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2391{
099be4f1 2392 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2393
2394 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2395
46c461b5 2396 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2397}
2398
39a65960
DM
2399
2400/* recursively scan a stash and any nested stashes looking for entries
2401 * that need the "only used once" warning raised
2402 */
2403
79072805 2404void
51da40ed 2405Perl_gv_check(pTHX_ HV *stash)
79072805 2406{
eb578fdb 2407 I32 i;
463ee0b2 2408
7918f24d
NC
2409 PERL_ARGS_ASSERT_GV_CHECK;
2410
8990e307
LW
2411 if (!HvARRAY(stash))
2412 return;
90754377
DM
2413
2414 assert(SvOOK(stash));
90754377 2415
a0d0e21e 2416 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2417 const HE *entry;
90754377 2418 /* mark stash is being scanned, to avoid recursing */
339441ef 2419 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2420 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2421 GV *gv;
b7787f18 2422 HV *hv;
dc437b57 2423 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2424 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2425 {
90754377
DM
2426 if (hv != PL_defstash && hv != stash
2427 && !(SvOOK(hv)
2428 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2429 )
a0d0e21e
LW
2430 gv_check(hv); /* nested package */
2431 }
ecad31f0
BF
2432 else if ( *HeKEY(entry) != '_'
2433 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2434 const char *file;
159b6efe 2435 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2436 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2437 continue;
1d7c1841 2438 file = GvFILE(gv);
1d7c1841 2439 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC
2440#ifdef USE_ITHREADS
2441 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2442#else
2443 CopFILEGV(PL_curcop)
2444 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2445#endif
9014280d 2446 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC
2447 "Name \"%"HEKf"::%"HEKf
2448 "\" used only once: possible typo",
2449 HEKfARG(HvNAME_HEK(stash)),
2450 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2451 }
79072805 2452 }
339441ef 2453 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW
2454 }
2455}
2456
2457GV *
9cc50d5b 2458Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2459{
9cc50d5b 2460 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2461 assert(!(flags & ~SVf_UTF8));
7918f24d 2462
b17a0679
FC
2463 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2464 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF
2465 (long)PL_gensym++),
2466 GV_ADD, SVt_PVGV);
79072805
LW
2467}
2468
2469/* hopefully this is only called on local symbol table entries */
2470
2471GP*
864dbfa3 2472Perl_gp_ref(pTHX_ GP *gp)
79072805 2473{
1d7c1841 2474 if (!gp)
d4c19fe8 2475 return NULL;
79072805 2476 gp->gp_refcnt++;
44a8e56a
PP
2477 if (gp->gp_cv) {
2478 if (gp->gp_cvgen) {
e1a479c5
BB
2479 /* If the GP they asked for a reference to contains
2480 a method cache entry, clear it first, so that we
2481 don't infect them with our cached entry */
e7881358 2482 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2483 gp->gp_cv = NULL;
44a8e56a
PP
2484 gp->gp_cvgen = 0;
2485 }
44a8e56a 2486 }
79072805 2487 return gp;
79072805
LW
2488}
2489
2490void
864dbfa3 2491Perl_gp_free(pTHX_ GV *gv)
79072805 2492{
79072805 2493 GP* gp;
b0d55c99 2494 int attempts = 100;
79072805 2495
f7877b28 2496 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2497 return;
f248d071 2498 if (gp->gp_refcnt == 0) {
9b387841
NC
2499 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2500 "Attempt to free unreferenced glob pointers"
2501 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2502 return;
2503 }
4571f4a7 2504 if (gp->gp_refcnt > 1) {
bc81b34d 2505 borrowed:
748a9306
LW
2506 if (gp->gp_egv == gv)
2507 gp->gp_egv = 0;
4571f4a7 2508 gp->gp_refcnt--;
c43ae56f 2509 GvGP_set(gv, NULL);
79072805 2510 return;
748a9306 2511 }
79072805 2512
b0d55c99
FC
2513 while (1) {
2514 /* Copy and null out all the glob slots, so destructors do not see
2515 freed SVs. */
2516 HEK * const file_hek = gp->gp_file_hek;
2517 SV * const sv = gp->gp_sv;
2518 AV * const av = gp->gp_av;
2519 HV * const hv = gp->gp_hv;
2520 IO * const io = gp->gp_io;
2521 CV * const cv = gp->gp_cv;
2522 CV * const form = gp->gp_form;
2523
2524 gp->gp_file_hek = NULL;
2525 gp->gp_sv = NULL;
2526 gp->gp_av = NULL;
2527 gp->gp_hv = NULL;
2528 gp->gp_io = NULL;
2529 gp->gp_cv = NULL;
2530 gp->gp_form = NULL;
2531
2532 if (file_hek)
2533 unshare_hek(file_hek);
2534
2535 SvREFCNT_dec(sv);
2536 SvREFCNT_dec(av);
2537 /* FIXME - another reference loop GV -> symtab -> GV ?
2538 Somehow gp->gp_hv can end up pointing at freed garbage. */
2539 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2540 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC
2541 if (PL_stashcache && hvname_hek) {
2542 DEBUG_o(Perl_deb(aTHX_
2543 "gp_free clearing PL_stashcache for '%"HEKf"'\n",
2544 HEKfARG(hvname_hek)));
0ca9877d 2545 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2546 }
b0d55c99
FC
2547 SvREFCNT_dec(hv);
2548 }
96d7c888
FC
2549 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2550 && (IoTYPE(io) == IoTYPE_WRONLY ||
2551 IoTYPE(io) == IoTYPE_RDWR ||
2552 IoTYPE(io) == IoTYPE_APPEND)
2553 && ckWARN_d(WARN_IO)
2554 && IoIFP(io) != PerlIO_stdin()
2555 && IoIFP(io) != PerlIO_stdout()
2556 && IoIFP(io) != PerlIO_stderr()
2557 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2558 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC
2559 SvREFCNT_dec(io);
2560 SvREFCNT_dec(cv);
2561 SvREFCNT_dec(form);
2562
bc81b34d
FC
2563 /* Possibly reallocated by a destructor */
2564 gp = GvGP(gv);
2565
b0d55c99
FC
2566 if (!gp->gp_file_hek
2567 && !gp->gp_sv
2568 && !gp->gp_av
2569 && !gp->gp_hv
2570 && !gp->gp_io
2571 && !gp->gp_cv
2572 && !gp->gp_form) break;
2573
2574 if (--attempts == 0) {
2575 Perl_die(aTHX_
2576 "panic: gp_free failed to free glob pointer - "
2577 "something is repeatedly re-creating entries"
2578 );
2579 }
13207a71 2580 }
748a9306 2581
bc81b34d
FC
2582 /* Possibly incremented by a destructor doing glob assignment */
2583 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2584 Safefree(gp);
c43ae56f 2585 GvGP_set(gv, NULL);
79072805
LW
2586}
2587
d460ef45
NIS
2588int
2589Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2590{
53c1dcc0
AL
2591 AMT * const amtp = (AMT*)mg->mg_ptr;
2592 PERL_UNUSED_ARG(sv);
dd374669 2593
7918f24d
NC
2594 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2595
d460ef45
NIS
2596 if (amtp && AMT_AMAGIC(amtp)) {
2597 int i;
2598 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2599 CV * const cv = amtp->table[i];
b37c2d43 2600 if (cv) {
e7881358 2601 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2602 amtp->table[i] = NULL;
d460ef45
NIS
2603 }
2604 }
2605 }
2606 return 0;
2607}
2608
a0d0e21e 2609/* Updates and caches the CV's */
c3a9a790
RGS
2610/* Returns:
2611 * 1 on success and there is some overload
2612 * 0 if there is no overload
2613 * -1 if some error occurred and it couldn't croak
2614 */
a0d0e21e 2615
c3a9a790 2616int
242f8760 2617Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2618{
ad64d0ec 2619 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2620 AMT amt;
9b439311 2621 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2622 U32 newgen;
a0d0e21e 2623
7918f24d
NC
2624 PERL_ARGS_ASSERT_GV_AMUPDATE;
2625
9b439311 2626 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2627 if (mg) {
2628 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2629 if (amtp->was_ok_sub == newgen) {
8c34e50d 2630 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2631 }
ad64d0ec 2632 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2633 }
a0d0e21e 2634
bfcb3514 2635 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2636
d460ef45 2637 Zero(&amt,1,AMT);
e1a479c5 2638 amt.was_ok_sub = newgen;
a6006777
PP
2639 amt.fallback = AMGfallNO;
2640 amt.flags = 0;
2641
a6006777 2642 {
8c34e50d
FC
2643 int filled = 0;
2644 int i;
3d147ac2
DM
2645 bool deref_seen = 0;
2646
a6006777 2647
3866ea3b 2648 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2649
89ffc314 2650 /* Try to find via inheritance. */
e6919483 2651 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2652 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2653 CV* cv;
89ffc314
IZ
2654
2655 if (!gv)
3866ea3b
FC
2656 {
2657 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2658 goto no_table;
3866ea3b
FC
2659 }
2660#ifdef PERL_DONT_CREATE_GVSV
2661 else if (!sv) {
6f207bd3 2662 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC
2663 }
2664#endif
79c9643d
JL
2665 else if (SvTRUE(sv))
2666 /* don't need to set overloading here because fallback => 1
2667 * is the default setting for classes without overloading */
89ffc314 2668 amt.fallback=AMGfallYES;
79c9643d
JL
2669 else if (SvOK(sv)) {
2670 amt.fallback=AMGfallNEVER;
386a5489 2671 filled = 1;
386a5489 2672 }
79c9643d 2673 else {
386a5489 2674 filled = 1;
386a5489 2675 }
a6006777 2676
3d147ac2 2677 assert(SvOOK(stash));
3d147ac2 2678 /* initially assume the worst */
339441ef 2679 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2680
8c34e50d 2681 for (i = 1; i < NofAMmeth; i++) {
6136c704 2682 const char * const cooky = PL_AMG_names[i];
32251b26 2683 /* Human-readable form, for debugging: */
8c34e50d 2684 const char * const cp = AMG_id2name(i);
d279ab82 2685 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2686
a0288114 2687 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2688 cp, HvNAME_get(stash)) );
611c1e95
IZ
2689 /* don't fill the cache while looking up!
2690 Creation of inheritance stubs in intermediate packages may
2691 conflict with the logic of runtime method substitution.
2692 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2693 then we could have created stubs for "(+0" in A and C too.
2694 But if B overloads "bool", we may want to use it for
2695 numifying instead of C's "+0". */
8c34e50d 2696 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2697 cv = 0;
c3ad4e54
FC
2698 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2699 const HEK * const gvhek =
2700 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2701 const HEK * const stashek =
2702 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2703 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2704 && stashek && HEK_LEN(stashek) == 8
2705 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ
2706 /* This is a hack to support autoloading..., while
2707 knowing *which* methods were declared as overloaded. */
44a8e56a 2708 /* GvSV contains the name of the method. */
6136c704 2709 GV *ngv = NULL;
c69033f2 2710 SV *gvsv = GvSV(gv);
a0288114
AL
2711
2712 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2713 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2714 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2715 if (!gvsv || !SvPOK(gvsv)
7f415459 2716 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2717 {
a0288114 2718 /* Can be an import stub (created by "can"). */
242f8760 2719 if (destructing) {
c3a9a790 2720 return -1;
242f8760
RGS
2721 }
2722 else {
d66cca07
BF
2723 const SV * const name = (gvsv && SvPOK(gvsv))
2724 ? gvsv
2725 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2726 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF
2727 Perl_croak(aTHX_ "%s method \"%"SVf256
2728 "\" overloading \"%s\" "\
d0c0e7dd 2729 "in package \"%"HEKf256"\"",
242f8760
RGS
2730 (GvCVGEN(gv) ? "Stub found while resolving"
2731 : "Can't resolve"),
d66cca07 2732 SVfARG(name), cp,
d0c0e7dd 2733 HEKfARG(
d66cca07 2734 HvNAME_HEK(stash)
d0c0e7dd 2735 ));
242f8760 2736 }
44a8e56a 2737 }
dc848c6f 2738 cv = GvCV(gv = ngv);
44a8e56a 2739 }
b464bac0 2740 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2741 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2742 GvNAME(CvGV(cv))) );
2743 filled = 1;
611c1e95 2744 } else if (gv) { /* Autoloaded... */
ea726b52 2745 cv = MUTABLE_CV(gv);
611c1e95 2746 filled = 1;
44a8e56a 2747 }
ea726b52 2748 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM
2749
2750 if (gv) {
2751 switch (i) {
2752 case to_sv_amg:
2753 case to_av_amg:
2754 case to_hv_amg:
2755 case to_gv_amg:
2756 case to_cv_amg:
2757 case nomethod_amg:
2758 deref_seen = 1;
2759 break;
2760 }
2761 }
a0d0e21e 2762 }
3d147ac2 2763 if (!deref_seen)
45479970
DM
2764 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2765 * NB - aux var invalid here, HvARRAY() could have been
2766 * reallocated since it was assigned to */
2767 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2768
a0d0e21e 2769 if (filled) {
a6006777 2770 AMT_AMAGIC_on(&amt);
ad64d0ec 2771 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2772 (char*)&amt, sizeof(AMT));
8c34e50d 2773 return TRUE;
a0d0e21e
LW
2774 }
2775 }
a6006777 2776 /* Here we have no table: */
8c34e50d 2777 no_table:
a6006777 2778 AMT_AMAGIC_off(&amt);
ad64d0ec 2779 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2780 (char*)&amt, sizeof(AMTS));
c3a9a790 2781 return 0;
a0d0e21e
LW
2782}
2783
32251b26
IZ
2784
2785CV*
2786Perl_gv_handler(pTHX_ HV *stash, I32 id)
2787{
3f8f4626 2788 MAGIC *mg;
32251b26 2789 AMT *amtp;
e1a479c5 2790 U32 newgen;
9b439311 2791 struct mro_meta* stash_meta;
32251b26 2792
bfcb3514 2793 if (!stash || !HvNAME_get(stash))
601f1833 2794 return NULL;
e1a479c5 2795
9b439311
BB
2796 stash_meta = HvMROMETA(stash);
2797 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2798
ad64d0ec 2799 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2800 if (!mg) {
2801 do_update:
8c34e50d 2802 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2803 return NULL;
ad64d0ec 2804 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2805 }
a9fd4e40 2806 assert(mg);
32251b26 2807 amtp = (AMT*)mg->mg_ptr;
66978156 2808 if ( amtp->was_ok_sub != newgen )
32251b26 2809 goto do_update;
3ad83ce7 2810 if (AMT_AMAGIC(amtp)) {
b7787f18 2811 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2812 if (ret && isGV(ret)) { /* Autoloading stab */
2813 /* Passing it through may have resulted in a warning
2814 "Inherited AUTOLOAD for a non-method deprecated", since
2815 our caller is going through a function call, not a method call.
2816 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2817 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2818
2819 if (gv && GvCV(gv))
2820 return GvCV(gv);
2821 }
2822 return ret;
2823 }
a0288114 2824
601f1833 2825 return NULL;
32251b26
IZ
2826}
2827
2828
6f1401dc
DM
2829/* Implement tryAMAGICun_MG macro.
2830 Do get magic, then see if the stack arg is overloaded and if so call it.
2831 Flags:
2832 AMGf_set return the arg using SETs rather than assigning to
2833 the targ
2834 AMGf_numeric apply sv_2num to the stack arg.
2835*/
2836
2837bool
2838Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM
2839 dSP;
2840 SV* tmpsv;
2841 SV* const arg = TOPs;
2842
2843 SvGETMAGIC(arg);
2844
9f8bf298 2845 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC
2846 AMGf_noright | AMGf_unary
2847 | (flags & AMGf_numarg))))
2848 {
6f1401dc
DM
2849 if (flags & AMGf_set) {
2850 SETs(tmpsv);
2851 }
2852 else {
2853 dTARGET;
2854 if (SvPADMY(TARG)) {
2855 sv_setsv(TARG, tmpsv);
2856 SETTARG;
2857 }
2858 else
2859 SETs(tmpsv);
2860 }
2861 PUTBACK;
2862 return TRUE;
2863 }
2864
2865 if ((flags & AMGf_numeric) && SvROK(arg))
2866 *sp = sv_2num(arg);
2867 return FALSE;
2868}
2869
2870
2871/* Implement tryAMAGICbin_MG macro.
2872 Do get magic, then see if the two stack args are overloaded and if so
2873 call it.
2874 Flags:
2875 AMGf_set return the arg using SETs rather than assigning to
2876 the targ
2877 AMGf_assign op may be called as mutator (eg +=)
2878 AMGf_numeric apply sv_2num to the stack arg.
2879*/
2880
2881bool
2882Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM
2883 dSP;
2884 SV* const left = TOPm1s;
2885 SV* const right = TOPs;
2886
2887 SvGETMAGIC(left);
2888 if (left != right)
2889 SvGETMAGIC(right);
2890
2891 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2892 SV * const tmpsv = amagic_call(left, right, method,
636ac8fc
FC
2893 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0)
2894 | (flags & AMGf_numarg));
6f1401dc
DM
2895 if (tmpsv) {
2896 if (flags & AMGf_set) {
2897 (void)POPs;
2898 SETs(tmpsv);
2899 }
2900 else {
2901 dATARGET;
2902 (void)POPs;
2903 if (opASSIGN || SvPADMY(TARG)) {
2904 sv_setsv(TARG, tmpsv);
2905 SETTARG;
2906 }
2907 else
2908 SETs(tmpsv);
2909 }
2910 PUTBACK;
2911 return TRUE;
2912 }
2913 }
75ea7a12
FC
2914 if(left==right && SvGMAGICAL(left)) {
2915 SV * const left = sv_newmortal();
2916 *(sp-1) = left;
2917 /* Print the uninitialized warning now, so it includes the vari-
2918 able name. */
2919 if (!SvOK(right)) {
2920 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2921 sv_setsv_flags(left, &PL_sv_no, 0);
2922 }
2923 else sv_setsv_flags(left, right, 0);
2924 SvGETMAGIC(right);
2925 }
6f1401dc 2926 if (flags & AMGf_numeric) {
75ea7a12
FC
2927 if (SvROK(TOPm1s))
2928 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
2929 if (SvROK(right))
2930 *sp = sv_2num(right);
2931 }
2932 return FALSE;
2933}
2934
25a9ffce
NC
2935SV *
2936Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2937 SV *tmpsv = NULL;
3d147ac2 2938 HV *stash;
25a9ffce
NC
2939
2940 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2941
3d147ac2
DM
2942 if (!SvAMAGIC(ref))
2943 return ref;
2944 /* return quickly if none of the deref ops are overloaded */
2945 stash = SvSTASH(SvRV(ref));
2946 assert(SvOOK(stash));
2947 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2948 return ref;
2949
2950 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC
2951 AMGf_noright | AMGf_unary))) {
2952 if (!SvROK(tmpsv))
2953 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2954 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2955 /* Bail out if it returns us the same reference. */
2956 return tmpsv;
2957 }
2958 ref = tmpsv;
3d147ac2
DM
2959 if (!SvAMAGIC(ref))
2960 break;
25a9ffce
NC
2961 }
2962 return tmpsv ? tmpsv : ref;
2963}
6f1401dc 2964
8d569291
FC
2965bool
2966Perl_amagic_is_enabled(pTHX_ int method)
2967{
2968 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2969
2970 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2971
2972 if ( !lex_mask || !SvOK(lex_mask) )
2973 /* overloading lexically disabled */
2974 return FALSE;
2975 else if ( lex_mask && SvPOK(lex_mask) ) {
2976 /* we have an entry in the hints hash, check if method has been
2977 * masked by overloading.pm */
2978 STRLEN len;
2979 const int offset = method / 8;
2980 const int bit = method % 8;
2981 char *pv = SvPV(lex_mask, len);
2982
2983 /* Bit set, so this overloading operator is disabled */
2984 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2985 return FALSE;
2986 }
2987 return TRUE;
2988}
2989
a0d0e21e 2990SV*
864dbfa3 2991Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2992{
27da23d5 2993 dVAR;
b267980d 2994 MAGIC *mg;
9c5ffd7c 2995 CV *cv=NULL;
a0d0e21e 2996 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2997 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
2998 int off = 0, off1, lr = 0, notfound = 0;
2999 int postpr = 0, force_cpy = 0;
3000 int assign = AMGf_assign & flags;
3001 const int assignshift = assign ? 1 : 0;
bf5522a1 3002 int use_default_op = 0;
67288365 3003 int force_scalar = 0;
497b47a8
JH
3004#ifdef DEBUGGING
3005 int fl=0;
497b47a8 3006#endif
25716404 3007 HV* stash=NULL;
7918f24d
NC
3008
3009 PERL_ARGS_ASSERT_AMAGIC_CALL;
3010
e46c382e 3011 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3012 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK
3013 }
3014
a0d0e21e 3015 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3016 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3017 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3018 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3019 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3020 : NULL))
b267980d 3021 && ((cv = cvp[off=method+assignshift])
748a9306
LW
3022 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3023 * usual method */
497b47a8
JH
3024 (
3025#ifdef DEBUGGING
3026 fl = 1,
a0288114 3027#endif
497b47a8 3028 cv = cvp[off=method])))) {
a0d0e21e
LW
3029 lr = -1; /* Call method for left argument */
3030 } else {
3031 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3032 int logic;
3033
3034 /* look for substituted methods */
ee239bfe 3035 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
3036 switch (method) {
3037 case inc_amg:
ee239bfe
IZ
3038 force_cpy = 1;
3039 if ((cv = cvp[off=add_ass_amg])
3040 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3041 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
3042 }
3043 break;
3044 case dec_amg:
ee239bfe
IZ
3045 force_cpy = 1;
3046 if ((cv = cvp[off = subtr_ass_amg])
3047 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3048 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
3049 }
3050 break;
3051 case bool__amg:
3052 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3053 break;
3054 case numer_amg:
3055 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3056 break;
3057 case string_amg:
3058 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3059 break;
b7787f18
AL
3060 case not_amg:
3061 (void)((cv = cvp[off=bool__amg])
3062 || (cv = cvp[off=numer_amg])
3063 || (cv = cvp[off=string_amg]));
2ab54efd
MB
3064 if (cv)
3065 postpr = 1;
b7787f18 3066 break;
748a9306
LW
3067 case copy_amg:
3068 {
76e3520e
GS
3069 /*
3070 * SV* ref causes confusion with the interpreter variable of
3071 * the same name
3072 */
890ce7af 3073 SV* const tmpRef=SvRV(left);
76e3520e 3074 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
3075 /*
3076 * Just to be extra cautious. Maybe in some
3077 * additional cases sv_setsv is safe, too.
3078 */
890ce7af 3079 SV* const newref = newSVsv(tmpRef);
748a9306 3080 SvOBJECT_on(newref);
a1cd65be
FC
3081 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3082 delegate to the stash. */
85fbaab2 3083 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
3084 return newref;
3085 }
3086 }
3087 break;
a0d0e21e 3088 case abs_amg:
b267980d 3089 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3090 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3091 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3092 if (off1==lt_amg) {
890ce7af 3093 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3094 lt_amg,AMGf_noright);
3095 logic = SvTRUE(lessp);
3096 } else {
890ce7af 3097 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3098 ncmp_amg,AMGf_noright);
3099 logic = (SvNV(lessp) < 0);
3100 }
3101 if (logic) {
3102 if (off==subtr_amg) {
3103 right = left;
748a9306 3104 left = nullsv;
a0d0e21e
LW
3105 lr = 1;
3106 }
3107 } else {
3108 return left;
3109 }
3110 }
3111 break;
3112 case neg_amg:
155aba94 3113 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW
3114 right = left;
3115 left = sv_2mortal(newSViv(0));
3116 lr = 1;
3117 }
3118 break;
f216259d 3119 case int_amg:
f5284f61 3120 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3121 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3122 case regexp_amg:
b267980d
NIS
3123 /* FAIL safe */
3124 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3125
f5284f61
IZ
3126 case to_sv_amg:
3127 case to_av_amg:
3128 case to_hv_amg:
3129 case to_gv_amg:
3130 case to_cv_amg:
3131 /* FAIL safe */
b267980d 3132 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3133
a0d0e21e
LW
3134 default:
3135 goto not_found;
3136 }
3137 if (!cv) goto not_found;
3138 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3139 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3140 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3141 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3142 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3143 : NULL))
69815d08
RS
3144 && (cv = cvp[off=method])) { /* Method for right
3145 * argument found */
3146 lr=1;
bf5522a1
MB
3147 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3148 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
3149 && !(flags & AMGf_unary)) {
3150 /* We look for substitution for
3151 * comparison operations and
fc36a67e 3152 * concatenation */
a0d0e21e
LW
3153 if (method==concat_amg || method==concat_ass_amg
3154 || method==repeat_amg || method==repeat_ass_amg) {
3155 return NULL; /* Delegate operation to string conversion */
3156 }
3157 off = -1;
3158 switch (method) {
3159 case lt_amg:
3160 case le_amg:
3161 case gt_amg:
3162 case ge_amg:
3163 case eq_amg:
3164 case ne_amg:
2ab54efd
MB
3165 off = ncmp_amg;
3166 break;
a0d0e21e
LW
3167 case slt_amg:
3168 case sle_amg:
3169 case sgt_amg:
3170 case sge_amg:
3171 case seq_amg:
3172 case sne_amg:
2ab54efd
MB
3173 off = scmp_amg;
3174 break;
a0d0e21e 3175 }
bf5522a1
MB
3176 if (off != -1) {
3177 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3178 cv = ocvp[off];
3179 lr = -1;
3180 }
3181 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3182 cv = cvp[off];
3183 lr = 1;
3184 }
3185 }
3186 if (cv)
2ab54efd
MB
3187 postpr = 1;
3188 else
3189 goto not_found;
a0d0e21e 3190 } else {
a6006777 3191 not_found: /* No method found, either report or croak */
b267980d
NIS
3192 switch (method) {
3193 case to_sv_amg:
3194 case to_av_amg:
3195 case to_hv_amg:
3196 case to_gv_amg:
3197 case to_cv_amg:
3198 /* FAIL safe */
3199 return left; /* Delegate operation to standard mechanisms. */
b267980d 3200 }
a0d0e21e
LW
3201 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3202 notfound = 1; lr = -1;
3203 } else if (cvp && (cv=cvp[nomethod_amg])) {
3204 notfound = 1; lr = 1;
bf5522a1
MB
3205 } else if ((use_default_op =
3206 (!ocvp || oamtp->fallback >= AMGfallYES)
3207 && (!cvp || amtp->fallback >= AMGfallYES))
3208 && !DEBUG_o_TEST) {
4cc0ca18
NC
3209 /* Skip generating the "no method found" message. */
3210 return NULL;
a0d0e21e 3211 } else {
46fc3d4c 3212 SV *msg;
774d564b 3213 if (off==-1) off=method;
b267980d 3214 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF
3215 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3216 AMG_id2name(method + assignshift),
3217 (flags & AMGf_unary ? " " : "\n\tleft "),
3218 SvAMAGIC(left)?
3219 "in overloaded package ":
3220 "has no overloaded magic",
3221 SvAMAGIC(left)?
3222 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3223 SVfARG(&PL_sv_no),
3224 SvAMAGIC(right)?
3225 ",\n\tright argument in overloaded package ":
3226 (flags & AMGf_unary
3227 ? ""
3228 : ",\n\tright argument has no overloaded magic"),
3229 SvAMAGIC(right)?
3230 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3231 SVfARG(&PL_sv_no)));
bf5522a1 3232 if (use_default_op) {
d66cca07 3233 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3234 } else {
be2597df 3235 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW
3236 }
3237 return NULL;
3238 }
ee239bfe 3239 force_cpy = force_cpy || assign;
a0d0e21e
LW
3240 }
3241 }
67288365
JL
3242
3243 switch (method) {
3244 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3245 * operation. we need this to return a value, so that it can be assigned
3246 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3247 * increment or decrement was itself called in void context */
3248 case inc_amg:
3249 if (off == add_amg)
3250 force_scalar = 1;
3251 break;
3252 case dec_amg:
3253 if (off == subtr_amg)
3254 force_scalar = 1;
3255 break;
3256 /* in these cases, we're calling an assignment variant of an operator
3257 * (+= rather than +, for instance). regardless of whether it's a
3258 * fallback or not, it always has to return a value, which will be
3259 * assigned to the proper variable later */
3260 case add_amg:
3261 case subtr_amg:
3262 case mult_amg:
3263 case div_amg:
3264 case modulo_amg:
3265 case pow_amg:
3266 case lshift_amg:
3267 case rshift_amg:
3268 case repeat_amg:
3269 case concat_amg:
3270 case band_amg:
3271 case bor_amg:
3272 case bxor_amg:
6d06ecce
FC
3273 case sband_amg:
3274 case sbor_amg:
3275 case sbxor_amg:
67288365
JL
3276 if (assign)
3277 force_scalar = 1;
3278 break;
3279 /* the copy constructor always needs to return a value */
3280 case copy_amg:
3281 force_scalar = 1;
3282 break;
3283 /* because of the way these are implemented (they don't perform the
3284 * dereferencing themselves, they return a reference that perl then
3285 * dereferences later), they always have to be in scalar context */
3286 case to_sv_amg:
3287 case to_av_amg:
3288 case to_hv_amg:
3289 case to_gv_amg:
3290 case to_cv_amg:
3291 force_scalar = 1;
3292 break;
3293 /* these don't have an op of their own; they're triggered by their parent
3294 * op, so the context there isn't meaningful ('$a and foo()' in void
3295 * context still needs to pass scalar context on to $a's bool overload) */
3296 case bool__amg:
3297 case numer_amg:
3298 case string_amg:
3299 force_scalar = 1;
3300 break;
3301 }
3302
497b47a8 3303#ifdef DEBUGGING
a0d0e21e 3304 if (!notfound) {
497b47a8 3305 DEBUG_o(Perl_deb(aTHX_
d66cca07 3306 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH
3307 AMG_id2name(off),
3308 method+assignshift==off? "" :
a0288114 3309 " (initially \"",
497b47a8
JH
3310 method+assignshift==off? "" :
3311 AMG_id2name(method+assignshift),
a0288114 3312 method+assignshift==off? "" : "\")",
497b47a8
JH
3313 flags & AMGf_unary? "" :
3314 lr==1 ? " for right argument": " for left argument",
3315 flags & AMGf_unary? " for argument" : "",
d66cca07 3316 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3317 fl? ",\n\tassignment variant used": "") );
ee239bfe 3318 }
497b47a8 3319#endif
748a9306
LW
3320 /* Since we use shallow copy during assignment, we need
3321 * to dublicate the contents, probably calling user-supplied
3322 * version of copy operator
3323 */
ee239bfe
IZ
3324 /* We need to copy in following cases:
3325 * a) Assignment form was called.
3326 * assignshift==1, assign==T, method + 1 == off
3327 * b) Increment or decrement, called directly.
3328 * assignshift==0, assign==0, method + 0 == off
3329 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3330 * assignshift==0, assign==T,
ee239bfe
IZ
3331 * force_cpy == T
3332 * d) Increment or decrement, translated to nomethod.
b267980d 3333 * assignshift==0, assign==0,
ee239bfe
IZ
3334 * force_cpy == T
3335 * e) Assignment form translated to nomethod.
3336 * assignshift==1, assign==T, method + 1 != off
3337 * force_cpy == T
3338 */
3339 /* off is method, method+assignshift, or a result of opcode substitution.
3340 * In the latter case assignshift==0, so only notfound case is important.
3341 */
73512201 3342 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3343 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3344 || force_cpy) )
6f1401dc 3345 {
1b38c28e
NC
3346 /* newSVsv does not behave as advertised, so we copy missing
3347 * information by hand */
3348 SV *tmpRef = SvRV(left);
3349 SV *rv_copy;
31d632c3 3350 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
3351 SvRV_set(left, rv_copy);
3352 SvSETMAGIC(left);
e7881358 3353 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3354 }
6f1401dc
DM
3355 }
3356
a0d0e21e
LW
3357 {
3358 dSP;
3359 BINOP myop;
3360 SV* res;
b7787f18 3361 const bool oldcatch = CATCH_GET;
67288365
JL
3362 I32 oldmark, nret;
3363 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3364
54310121 3365 CATCH_SET(TRUE);
a0d0e21e
LW
3366 Zero(&myop, 1, BINOP);
3367 myop.op_last = (OP *) &myop;
b37c2d43 3368 myop.op_next = NULL;
67288365
JL
3369 myop.op_flags = OPf_STACKED;
3370
3371 switch (gimme) {
3372 case G_VOID:
3373 myop.op_flags |= OPf_WANT_VOID;
3374 break;
3375 case G_ARRAY:
3376 if (flags & AMGf_want_list) {
3377 myop.op_flags |= OPf_WANT_LIST;
3378 break;
3379 }
3380 /* FALLTHROUGH */
3381 default:
3382 myop.op_flags |= OPf_WANT_SCALAR;
3383 break;
3384 }
a0d0e21e 3385
e788e7d3 3386 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3387 ENTER;
462e5cf6 3388 SAVEOP();
533c011a 3389 PL_op = (OP *) &myop;
3280af22 3390 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3391 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3392 Perl_pp_pushmark(aTHX);
a0d0e21e 3393
924508f0 3394 EXTEND(SP, notfound + 5);
a0d0e21e
LW
3395 PUSHs(lr>0? right: left);
3396 PUSHs(lr>0? left: right);
3280af22 3397 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3398 if (notfound) {
59cd0e26
NC
3399 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3400 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3401 }
636ac8fc
FC
3402 else if (flags & AMGf_numarg)
3403 PUSHs(&PL_sv_undef);
3404 if (flags & AMGf_numarg)
3405 PUSHs(&PL_sv_yes);
ad64d0ec 3406 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3407 PUTBACK;
67288365 3408 oldmark = TOPMARK;
a0d0e21e 3409
139d0ce6 3410 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3411 CALLRUNOPS(aTHX);
a0d0e21e
LW
3412 LEAVE;
3413 SPAGAIN;
67288365
JL
3414 nret = SP - (PL_stack_base + oldmark);
3415
3416 switch (gimme) {
3417 case G_VOID:
3418 /* returning NULL has another meaning, and we check the context
3419 * at the call site too, so this can be differentiated from the
3420 * scalar case */
3421 res = &PL_sv_undef;
3422 SP = PL_stack_base + oldmark;
3423 break;
3424 case G_ARRAY: {
3425 if (flags & AMGf_want_list) {
3426 res = sv_2mortal((SV *)newAV());
3427 av_extend((AV *)res, nret);
3428 while (nret--)
3429 av_store((AV *)res, nret, POPs);
3430 break;
3431 }
3432 /* FALLTHROUGH */
3433 }
3434 default:
3435 res = POPs;
3436 break;
3437 }
a0d0e21e 3438
ebafeae7 3439 PUTBACK;
d3acc0f7 3440 POPSTACK;
54310121 3441 CATCH_SET(oldcatch);
a0d0e21e 3442
a0d0e21e 3443 if (postpr) {
b7787f18 3444 int ans;
a0d0e21e
LW
3445 switch (method) {
3446 case le_amg:
3447 case sle_amg:
3448 ans=SvIV(res)<=0; break;
3449 case lt_amg:
3450 case slt_amg:
3451 ans=SvIV(res)<0; break;
3452 case ge_amg:
3453 case sge_amg:
3454 ans=SvIV(res)>=0; break;
3455 case gt_amg:
3456 case sgt_amg:
3457 ans=SvIV(res)>0; break;
3458 case eq_amg:
3459 case seq_amg:
3460 ans=SvIV(res)==0; break;
3461 case ne_amg:
3462 case sne_amg:
3463 ans=SvIV(res)!=0; break;
3464 case inc_amg:
3465 case dec_amg:
bbce6d69 3466 SvSetSV(left,res); return left;
dc437b57 3467 case not_amg:
fe7ac86a 3468 ans=!SvTRUE(res); break;
b7787f18
AL
3469 default:
3470 ans=0; break;
a0d0e21e 3471 }
54310121 3472 return boolSV(ans);
748a9306
LW
3473 } else if (method==copy_amg) {
3474 if (!SvROK(res)) {
cea2e8a9 3475 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
3476 }
3477 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
3478 } else {
3479 return res;
3480 }
3481 }
3482}
c9d5ac95 3483
f5c1e807
NC
3484void
3485Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3486{
3487 dVAR;
acda4c6a 3488 U32 hash;
f5c1e807 3489
7918f24d 3490 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3491
acda4c6a
NC
3492 if (len > I32_MAX)
3493 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3494
ae8cc45f
NC
3495 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3496 unshare_hek(GvNAME_HEK(gv));
3497 }
3498
acda4c6a 3499 PERL_HASH(hash, name, len);
c60dbbc3 3500 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC
3501}
3502
66610fdd 3503/*
f7461760
Z
3504=for apidoc gv_try_downgrade
3505
2867cdbc
Z
3506If the typeglob C<gv> can be expressed more succinctly, by having
3507something other than a real GV in its place in the stash, replace it
3508with the optimised form. Basic requirements for this are that C<gv>
3509is a real typeglob, is sufficiently ordinary, and is only referenced
3510from its package. This function is meant to be used when a GV has been
3511looked up in part to see what was there, causing upgrading, but based
3512on what was found it turns out that the real GV isn't required after all.
3513
3514If C<gv> is a completely empty typeglob, it is deleted from the stash.
3515
3516If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3517sub, the typeglob is replaced with a scalar-reference placeholder that
3518more compactly represents the same thing.
f7461760
Z
3519
3520=cut
3521*/
3522
3523void
3524Perl_gv_try_downgrade(pTHX_ GV *gv)
3525{
3526 HV *stash;
3527 CV *cv;
3528 HEK *namehek;
3529 SV **gvp;
3530 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC
3531
3532 /* XXX Why and where does this leave dangling pointers during global
3533 destruction? */
627364f1 3534 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3535
2867cdbc 3536 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3537 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3538 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3539 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3540 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3541 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3542 return;
2be08ad1
FC
3543 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3544 return;
803f2748
DM
3545 if (SvMAGICAL(gv)) {
3546 MAGIC *mg;
3547 /* only backref magic is allowed */
3548 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3549 return;
3550 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3551 if (mg->mg_type != PERL_MAGIC_backref)
3552 return;
3553 }
3554 }
2867cdbc
Z
3555 cv = GvCV(gv);
3556 if (!cv) {
3557 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3558 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3559 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3560 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3561 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z
3562 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3563 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3564 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3565 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z
3566 *gvp == (SV*)gv) {
3567 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3568 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z
3569 SvREFCNT(gv) = 0;
3570 sv_clear((SV*)gv);
3571 SvREFCNT(gv) = 1;
70e5f2b5 3572 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH
3573
3574 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z
3575 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3576 STRUCT_OFFSET(XPVIV, xiv_iv));
3577 SvRV_set(gv, value);
3578 }
3579}
3580
9e3fb20c
FC
3581GV *
3582Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3583{
3584 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3585 GV * const *gvp;
3586 PERL_ARGS_ASSERT_GV_OVERRIDE;
3587 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3588 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3589 gv = gvp ? *gvp : NULL;
3590 if (gv && !isGV(gv)) {
3591 if (!SvPCS_IMPORTED(gv)) return NULL;
3592 gv_init(gv, PL_globalstash, name, len, 0);
3593 return gv;
3594 }
3595 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3596}
3597
4aaa4757
FC
3598#include "XSUB.h"
3599
3600static void
3601core_xsub(pTHX_ CV* cv)
3602{
3603 Perl_croak(aTHX_
3604 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3605 );
3606}
3607
f7461760 3608/*
14d04a33 3609 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3610 */