SVt_PVAV Array
SVt_PVHV Hash
SVt_PVCV Code
- SVt_PVGV Glob (possible a file handle)
+ SVt_PVGV Glob (possibly a file handle)
SVt_PVMG Blessed or Magical Scalar
See the F<sv.h> header file for more details.
(old-style char and macro) MGVTBL Type of magic
-------------------------- ------ -------------
\0 PERL_MAGIC_sv vtbl_sv Special scalar variable
+ # PERL_MAGIC_arylen vtbl_arylen Array length ($#ary)
+ % PERL_MAGIC_rhash (none) extra data for restricted
+ hashes
+ . PERL_MAGIC_pos vtbl_pos pos() lvalue
+ : PERL_MAGIC_symtab (none) extra data for symbol tables
+ < PERL_MAGIC_backref vtbl_backref for weak ref data
+ @ PERL_MAGIC_arylen_p (none) to move arylen out of XPVAV
A PERL_MAGIC_overload vtbl_amagic %OVERLOAD hash
a PERL_MAGIC_overload_elem vtbl_amagicelem %OVERLOAD hash element
- c PERL_MAGIC_overload_table (none) Holds overload table (AMT)
- on stash
- B PERL_MAGIC_bm vtbl_bm Boyer-Moore (fast string search)
- D PERL_MAGIC_regdata vtbl_regdata Regex match position data
+ B PERL_MAGIC_bm vtbl_regexp Boyer-Moore
+ (fast string search)
+ c PERL_MAGIC_overload_table vtbl_ovrld Holds overload table
+ (AMT) on stash
+ D PERL_MAGIC_regdata vtbl_regdata Regex match position data
(@+ and @- vars)
d PERL_MAGIC_regdatum vtbl_regdatum Regex match position data
element
E PERL_MAGIC_env vtbl_env %ENV hash
e PERL_MAGIC_envelem vtbl_envelem %ENV hash element
- f PERL_MAGIC_fm vtbl_fm Formline ('compiled' format)
- g PERL_MAGIC_regex_global vtbl_mglob m//g target / study()ed string
+ f PERL_MAGIC_fm vtbl_regdata Formline ('compiled' format)
+ G PERL_MAGIC_study vtbl_regdata study()ed string
+ g PERL_MAGIC_regex_global vtbl_mglob m//g target
H PERL_MAGIC_hints vtbl_hints %^H hash
h PERL_MAGIC_hintselem vtbl_hintselem %^H hash element
I PERL_MAGIC_isa vtbl_isa @ISA array
k PERL_MAGIC_nkeys vtbl_nkeys scalar(keys()) lvalue
L PERL_MAGIC_dbfile (none) Debugger %_<filename
l PERL_MAGIC_dbline vtbl_dbline Debugger %_<filename element
- o PERL_MAGIC_collxfrm vtbl_collxfrm Locale collate transformation
+ N PERL_MAGIC_shared (none) Shared between threads
+ n PERL_MAGIC_shared_scalar (none) Shared between threads
+ o PERL_MAGIC_collxfrm vtbl_collxfrm Locale transformation
P PERL_MAGIC_tied vtbl_pack Tied array or hash
p PERL_MAGIC_tiedelem vtbl_packelem Tied array or hash element
q PERL_MAGIC_tiedscalar vtbl_packelem Tied scalar or handle
- r PERL_MAGIC_qr vtbl_qr precompiled qr// regex
- S PERL_MAGIC_sig vtbl_sig %SIG hash
+ r PERL_MAGIC_qr vtbl_regexp precompiled qr// regex
+ S PERL_MAGIC_sig (none) %SIG hash
s PERL_MAGIC_sigelem vtbl_sigelem %SIG hash element
t PERL_MAGIC_taint vtbl_taint Taintedness
U PERL_MAGIC_uvar vtbl_uvar Available for use by extensions
+ u PERL_MAGIC_uvar_elem (none) Reserved for use by extensions
+ V PERL_MAGIC_vstring (none) SV was vstring literal
v PERL_MAGIC_vec vtbl_vec vec() lvalue
- V PERL_MAGIC_vstring (none) v-string scalars
- w PERL_MAGIC_utf8 vtbl_utf8 UTF-8 length+offset cache
+ w PERL_MAGIC_utf8 vtbl_utf8 Cached UTF-8 information
x PERL_MAGIC_substr vtbl_substr substr() lvalue
y PERL_MAGIC_defelem vtbl_defelem Shadow "foreach" iterator
variable / smart parameter
vivification
- # PERL_MAGIC_arylen vtbl_arylen Array length ($#ary)
- . PERL_MAGIC_pos vtbl_pos pos() lvalue
- < PERL_MAGIC_backref vtbl_backref back pointer to a weak ref
+ ] PERL_MAGIC_checkcall (none) inlining/mutation of call to
+ this CV
~ PERL_MAGIC_ext (none) Available for use by extensions
- : PERL_MAGIC_symtab (none) hash used as symbol table
- % PERL_MAGIC_rhash (none) hash used as restricted hash
- @ PERL_MAGIC_arylen_p vtbl_arylen_p pointer to $#a from @a
When an uppercase and lowercase letter both exist in the table, then the
For more information, consult L<perlxs> and L<perlxstut>.
+=head2 Autoloading with XSUBs
+
+If an AUTOLOAD routine is an XSUB, as with Perl subroutines, Perl puts the
+fully-qualified name of the autoloaded subroutine in the $AUTOLOAD variable
+of the XSUB's package.
+
+But it also puts the same information in certain fields of the XSUB itself:
+
+ HV *stash = CvSTASH(cv);
+ const char *subname = SvPVX(cv);
+ STRLEN name_length = SvCUR(cv); /* in bytes */
+ U32 is_utf8 = SvUTF8(cv);
+
+C<SvPVX(cv)> contains just the sub name itself, not including the package.
+For an AUTOLOAD routine in UNIVERSAL or one of its superclasses,
+C<CvSTASH(cv)> returns NULL during a method call on a nonexistent package.
+
+B<Note>: Setting $AUTOLOAD stopped working in 5.6.1, which did not support
+XS AUTOLOAD subs at all. Perl 5.8.0 introduced the use of fields in the
+XSUB itself. Perl 5.16.0 restored the setting of $AUTOLOAD. If you need
+to support 5.8-5.14, use the XSUB's fields.
+
=head2 Calling Perl Routines from within C Programs
There are four routines that can be used to call a Perl subroutine from
https://perl5.git.perl.org / perl5.git / blobdiff