[perl5.git] / cv.h

/*    cv.h
 *
 *    Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2001,
 *    2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 */

/* This structure must match the beginning of XPVFM in sv.h  */

struct xpvcv {
    _XPV_HEAD;
    _XPVCV_COMMON;
};

/*
=head1 CV Handling

This section documents functions to manipulate CVs which are code-values,
meaning subroutines.  For more information, see L<perlguts>.

=for apidoc Ayh||CV

=for apidoc ADmnU||Nullcv
Null CV pointer.

(deprecated - use C<(CV *)NULL> instead)

=for apidoc Am|HV*|CvSTASH|CV* cv
Returns the stash of the CV.  A stash is the symbol table hash, containing
the package-scoped variables in the package where the subroutine was defined.
For more information, see L<perlguts>.

This also has a special use with XS AUTOLOAD subs.
See L<perlguts/Autoloading with XSUBs>.

=cut
*/

#ifndef PERL_CORE
#  define Nullcv Null(CV*)
#endif

#define CvSTASH(sv)	(0+((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_stash)
#define CvSTASH_set(cv,st) Perl_cvstash_set(aTHX_ cv, st)
#define CvSTART(sv)	((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_start_u.xcv_start
#define CvROOT(sv)	((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_root_u.xcv_root
#define CvXSUB(sv)	((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_root_u.xcv_xsub
#define CvXSUBANY(sv)	((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_start_u.xcv_xsubany
#define CvGV(sv)	Perl_CvGV(aTHX_ (CV *)(sv))
#define CvGV_set(cv,gv)	Perl_cvgv_set(aTHX_ cv, gv)
#define CvHASGV(cv)	cBOOL(SvANY(cv)->xcv_gv_u.xcv_gv)
#define CvFILE(sv)	((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_file
#ifdef USE_ITHREADS
#  define CvFILE_set_from_cop(sv, cop)	\
    (CvFILE(sv) = savepv(CopFILE(cop)), CvDYNFILE_on(sv))
#else
#  define CvFILE_set_from_cop(sv, cop)	\
    (CvFILE(sv) = CopFILE(cop), CvDYNFILE_off(sv))
#endif
#define CvFILEGV(sv)	(gv_fetchfile(CvFILE(sv)))
#define CvDEPTH(sv)	(*Perl_CvDEPTH((const CV *)sv))
/* For use when you only have a XPVCV*, not a real CV*.
   Must be assert protected as in Perl_CvDEPTH before use. */
#define CvDEPTHunsafe(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_depth

/* these CvPADLIST/CvRESERVED asserts can be reverted one day, once stabilized */
#define CvPADLIST(sv)	  (*(assert_(!CvISXSUB((CV*)(sv))) \
	&(((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_padlist_u.xcv_padlist)))
/* CvPADLIST_set is not public API, it can be removed one day, once stabilized */
#ifdef DEBUGGING
#  define CvPADLIST_set(sv, padlist) Perl_set_padlist((CV*)sv, padlist)
#else
#  define CvPADLIST_set(sv, padlist) (CvPADLIST(sv) = (padlist))
#endif
#define CvHSCXT(sv)	  *(assert_(CvISXSUB((CV*)(sv))) \
	&(((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_padlist_u.xcv_hscxt))
#ifdef DEBUGGING
#  if PTRSIZE == 8
#    define PoisonPADLIST(sv) \
        (((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_padlist_u.xcv_padlist = (PADLIST *)UINT64_C(0xEFEFEFEFEFEFEFEF))
#  elif PTRSIZE == 4
#    define PoisonPADLIST(sv) \
        (((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_padlist_u.xcv_padlist = (PADLIST *)0xEFEFEFEF)
#  else
#    error unknown pointer size
#  endif
#else
#  define PoisonPADLIST(sv) NOOP
#endif

#define CvOUTSIDE(sv)	  ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_outside
#define CvOUTSIDE_SEQ(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_outside_seq
#define CvFLAGS(sv)	  ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_flags

/* These two are sometimes called on non-CVs */
#define CvPROTO(sv)                               \
	(                                          \
	 SvPOK(sv)                                  \
	  ? SvTYPE(sv) == SVt_PVCV && CvAUTOLOAD(sv) \
	     ? SvEND(sv)+1 : SvPVX_const(sv)          \
	  : NULL                                       \
	)
#define CvPROTOLEN(sv)	                          \
	(                                          \
	 SvPOK(sv)                                  \
	  ? SvTYPE(sv) == SVt_PVCV && CvAUTOLOAD(sv) \
	     ? SvLEN(sv)-SvCUR(sv)-2                  \
	     : SvCUR(sv)                               \
	  : 0                                           \
	)

#define CVf_METHOD	0x0001	/* CV is explicitly marked as a method */
#define CVf_LVALUE	0x0002  /* CV return value can be used as lvalue */
#define CVf_CONST	0x0004  /* inlinable sub */
#define CVf_ISXSUB	0x0008	/* CV is an XSUB, not pure perl.  */

#define CVf_WEAKOUTSIDE	0x0010  /* CvOUTSIDE isn't ref counted */
#define CVf_CLONE	0x0020	/* anon CV uses external lexicals */
#define CVf_CLONED	0x0040	/* a clone of one of those */
#define CVf_ANON	0x0080	/* CV is not pointed to by a GV */
#define CVf_UNIQUE	0x0100	/* sub is only called once (eg PL_main_cv,
				 * require, eval). */
#define CVf_NODEBUG	0x0200	/* no DB::sub indirection for this CV
				   (esp. useful for special XSUBs) */
#define CVf_CVGV_RC	0x0400	/* CvGV is reference counted */
#if defined(PERL_CORE) || defined(PERL_EXT)
# define CVf_SLABBED	0x0800	/* Holds refcount on op slab  */
#endif
#define CVf_DYNFILE	0x1000	/* The filename is malloced  */
#define CVf_AUTOLOAD	0x2000	/* SvPVX contains AUTOLOADed sub name  */
#define CVf_HASEVAL	0x4000	/* contains string eval  */
#define CVf_NAMED	0x8000  /* Has a name HEK */
#define CVf_LEXICAL	0x10000 /* Omit package from name */
#define CVf_ANONCONST	0x20000 /* :const - create anonconst op */

/* This symbol for optimised communication between toke.c and op.c: */
#define CVf_BUILTIN_ATTRS	(CVf_METHOD|CVf_LVALUE|CVf_ANONCONST)

#define CvCLONE(cv)		(CvFLAGS(cv) & CVf_CLONE)
#define CvCLONE_on(cv)		(CvFLAGS(cv) |= CVf_CLONE)
#define CvCLONE_off(cv)		(CvFLAGS(cv) &= ~CVf_CLONE)

#define CvCLONED(cv)		(CvFLAGS(cv) & CVf_CLONED)
#define CvCLONED_on(cv)		(CvFLAGS(cv) |= CVf_CLONED)
#define CvCLONED_off(cv)	(CvFLAGS(cv) &= ~CVf_CLONED)

#define CvANON(cv)		(CvFLAGS(cv) & CVf_ANON)
#define CvANON_on(cv)		(CvFLAGS(cv) |= CVf_ANON)
#define CvANON_off(cv)		(CvFLAGS(cv) &= ~CVf_ANON)

/* CvEVAL or CvSPECIAL */
#define CvUNIQUE(cv)		(CvFLAGS(cv) & CVf_UNIQUE)
#define CvUNIQUE_on(cv)		(CvFLAGS(cv) |= CVf_UNIQUE)
#define CvUNIQUE_off(cv)	(CvFLAGS(cv) &= ~CVf_UNIQUE)

#define CvNODEBUG(cv)		(CvFLAGS(cv) & CVf_NODEBUG)
#define CvNODEBUG_on(cv)	(CvFLAGS(cv) |= CVf_NODEBUG)
#define CvNODEBUG_off(cv)	(CvFLAGS(cv) &= ~CVf_NODEBUG)

#define CvMETHOD(cv)		(CvFLAGS(cv) & CVf_METHOD)
#define CvMETHOD_on(cv)		(CvFLAGS(cv) |= CVf_METHOD)
#define CvMETHOD_off(cv)	(CvFLAGS(cv) &= ~CVf_METHOD)

#define CvLVALUE(cv)		(CvFLAGS(cv) & CVf_LVALUE)
#define CvLVALUE_on(cv)		(CvFLAGS(cv) |= CVf_LVALUE)
#define CvLVALUE_off(cv)	(CvFLAGS(cv) &= ~CVf_LVALUE)

/* eval or PL_main_cv */
#define CvEVAL(cv)		(CvUNIQUE(cv) && !SvFAKE(cv))
#define CvEVAL_on(cv)		(CvUNIQUE_on(cv),SvFAKE_off(cv))
#define CvEVAL_off(cv)		CvUNIQUE_off(cv)

/* BEGIN|CHECK|INIT|UNITCHECK|END */
#define CvSPECIAL(cv)		(CvUNIQUE(cv) && SvFAKE(cv))
#define CvSPECIAL_on(cv)	(CvUNIQUE_on(cv),SvFAKE_on(cv))
#define CvSPECIAL_off(cv)	(CvUNIQUE_off(cv),SvFAKE_off(cv))

#define CvCONST(cv)		(CvFLAGS(cv) & CVf_CONST)
#define CvCONST_on(cv)		(CvFLAGS(cv) |= CVf_CONST)
#define CvCONST_off(cv)		(CvFLAGS(cv) &= ~CVf_CONST)

#define CvWEAKOUTSIDE(cv)	(CvFLAGS(cv) & CVf_WEAKOUTSIDE)
#define CvWEAKOUTSIDE_on(cv)	(CvFLAGS(cv) |= CVf_WEAKOUTSIDE)
#define CvWEAKOUTSIDE_off(cv)	(CvFLAGS(cv) &= ~CVf_WEAKOUTSIDE)

#define CvISXSUB(cv)		(CvFLAGS(cv) & CVf_ISXSUB)
#define CvISXSUB_on(cv)		(CvFLAGS(cv) |= CVf_ISXSUB)
#define CvISXSUB_off(cv)	(CvFLAGS(cv) &= ~CVf_ISXSUB)

#define CvCVGV_RC(cv)		(CvFLAGS(cv) & CVf_CVGV_RC)
#define CvCVGV_RC_on(cv)	(CvFLAGS(cv) |= CVf_CVGV_RC)
#define CvCVGV_RC_off(cv)	(CvFLAGS(cv) &= ~CVf_CVGV_RC)

#ifdef PERL_CORE
# define CvSLABBED(cv)		(CvFLAGS(cv) & CVf_SLABBED)
# define CvSLABBED_on(cv)	(CvFLAGS(cv) |= CVf_SLABBED)
# define CvSLABBED_off(cv)	(CvFLAGS(cv) &= ~CVf_SLABBED)
#endif

#define CvDYNFILE(cv)		(CvFLAGS(cv) & CVf_DYNFILE)
#define CvDYNFILE_on(cv)	(CvFLAGS(cv) |= CVf_DYNFILE)
#define CvDYNFILE_off(cv)	(CvFLAGS(cv) &= ~CVf_DYNFILE)

#define CvAUTOLOAD(cv)		(CvFLAGS(cv) & CVf_AUTOLOAD)
#define CvAUTOLOAD_on(cv)	(CvFLAGS(cv) |= CVf_AUTOLOAD)
#define CvAUTOLOAD_off(cv)	(CvFLAGS(cv) &= ~CVf_AUTOLOAD)

#define CvHASEVAL(cv)		(CvFLAGS(cv) & CVf_HASEVAL)
#define CvHASEVAL_on(cv)	(CvFLAGS(cv) |= CVf_HASEVAL)
#define CvHASEVAL_off(cv)	(CvFLAGS(cv) &= ~CVf_HASEVAL)

#define CvNAMED(cv)		(CvFLAGS(cv) & CVf_NAMED)
#define CvNAMED_on(cv)		(CvFLAGS(cv) |= CVf_NAMED)
#define CvNAMED_off(cv)		(CvFLAGS(cv) &= ~CVf_NAMED)

#define CvLEXICAL(cv)		(CvFLAGS(cv) & CVf_LEXICAL)
#define CvLEXICAL_on(cv)	(CvFLAGS(cv) |= CVf_LEXICAL)
#define CvLEXICAL_off(cv)	(CvFLAGS(cv) &= ~CVf_LEXICAL)

#define CvANONCONST(cv)		(CvFLAGS(cv) & CVf_ANONCONST)
#define CvANONCONST_on(cv)	(CvFLAGS(cv) |= CVf_ANONCONST)
#define CvANONCONST_off(cv)	(CvFLAGS(cv) &= ~CVf_ANONCONST)

/* Flags for newXS_flags  */
#define XS_DYNAMIC_FILENAME	0x01	/* The filename isn't static  */

PERL_STATIC_INLINE HEK *
CvNAME_HEK(CV *sv)
{
    return CvNAMED(sv)
	? ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_gv_u.xcv_hek
	: 0;
}

/* helper for the common pattern:
   CvNAMED(sv) ? CvNAME_HEK((CV *)sv) : GvNAME_HEK(CvGV(sv))
*/
#define CvGvNAME_HEK(sv) ( \
        CvNAMED((CV*)sv) ? \
            ((XPVCV*)MUTABLE_PTR(SvANY((SV*)sv)))->xcv_gv_u.xcv_hek\
            : GvNAME_HEK(CvGV( (SV*) sv)) \
        )

/* This lowers the reference count of the previous value, but does *not*
   increment the reference count of the new value. */
#define CvNAME_HEK_set(cv, hek) ( \
	CvNAME_HEK((CV *)(cv))						 \
	    ? unshare_hek(SvANY((CV *)(cv))->xcv_gv_u.xcv_hek)	  \
	    : (void)0,						   \
	((XPVCV*)MUTABLE_PTR(SvANY(cv)))->xcv_gv_u.xcv_hek = (hek), \
	CvNAMED_on(cv)						     \
    )

/*

=for apidoc m|bool|CvWEAKOUTSIDE|CV *cv

Each CV has a pointer, C<CvOUTSIDE()>, to its lexically enclosing
CV (if any).  Because pointers to anonymous sub prototypes are
stored in C<&> pad slots, it is a possible to get a circular reference,
with the parent pointing to the child and vice-versa.  To avoid the
ensuing memory leak, we do not increment the reference count of the CV
pointed to by C<CvOUTSIDE> in the I<one specific instance> that the parent
has a C<&> pad slot pointing back to us.  In this case, we set the
C<CvWEAKOUTSIDE> flag in the child.  This allows us to determine under what
circumstances we should decrement the refcount of the parent when freeing
the child.

There is a further complication with non-closure anonymous subs (i.e. those
that do not refer to any lexicals outside that sub).  In this case, the
anonymous prototype is shared rather than being cloned.  This has the
consequence that the parent may be freed while there are still active
children, I<e.g.>,

    BEGIN { $a = sub { eval '$x' } }

In this case, the BEGIN is freed immediately after execution since there
are no active references to it: the anon sub prototype has
C<CvWEAKOUTSIDE> set since it's not a closure, and $a points to the same
CV, so it doesn't contribute to BEGIN's refcount either.  When $a is
executed, the C<eval '$x'> causes the chain of C<CvOUTSIDE>s to be followed,
and the freed BEGIN is accessed.

To avoid this, whenever a CV and its associated pad is freed, any
C<&> entries in the pad are explicitly removed from the pad, and if the
refcount of the pointed-to anon sub is still positive, then that
child's C<CvOUTSIDE> is set to point to its grandparent.  This will only
occur in the single specific case of a non-closure anon prototype
having one or more active references (such as C<$a> above).

One other thing to consider is that a CV may be merely undefined
rather than freed, eg C<undef &foo>.  In this case, its refcount may
not have reached zero, but we still delete its pad and its C<CvROOT> etc.
Since various children may still have their C<CvOUTSIDE> pointing at this
undefined CV, we keep its own C<CvOUTSIDE> for the time being, so that
the chain of lexical scopes is unbroken.  For example, the following
should print 123:

    my $x = 123;
    sub tmp { sub { eval '$x' } }
    my $a = tmp();
    undef &tmp;
    print  $a->();

=cut
*/

typedef OP *(*Perl_call_checker)(pTHX_ OP *, GV *, SV *);

#define CALL_CHECKER_REQUIRE_GV	MGf_REQUIRE_GV

#define CV_NAME_NOTQUAL		1

#ifdef PERL_CORE
# define CV_UNDEF_KEEP_NAME	1
#endif

/*
 * ex: set ts=8 sts=4 sw=4 et:
 */
Commit	Line	Data
a0d0e21e	1	/* cv.h
79072805	2	*
1129b882 NC	3	* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2001,
1129b882 NC	4	* 2002, 2003, 2004, 2005, 2006, 2007, 2008 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	*
79072805 LW	9	*/
79072805 LW	10
f653aab7	11	/* This structure must match the beginning of XPVFM in sv.h */
44a8e56a	12
79072805	13	struct xpvcv {
20f4945e	14	_XPV_HEAD;
20f4945e	15	_XPVCV_COMMON;
79072805	16	};
748a9306	17
954c1994	18	/*
51b56f5c KW	19	=head1 CV Handling
	20
	21	This section documents functions to manipulate CVs which are code-values,
	22	meaning subroutines. For more information, see L<perlguts>.
ccfc67b7	23
f204f8ac KW	24	=for apidoc Ayh\|\|CV
f204f8ac KW	25
78342678	26	=for apidoc ADmnU\|\|Nullcv
954c1994 GS	27	Null CV pointer.
954c1994 GS	28
3ae1b226 NC	29	(deprecated - use C<(CV *)NULL> instead)
3ae1b226 NC	30
954c1994	31	=for apidoc Am\|HV\|CvSTASH\|CV cv
72d33970	32	Returns the stash of the CV. A stash is the symbol table hash, containing
f0b90de1 SF	33	the package-scoped variables in the package where the subroutine was defined.
f0b90de1 SF	34	For more information, see L<perlguts>.
954c1994	35
5b36e945 FC	36	This also has a special use with XS AUTOLOAD subs.
	37	See L<perlguts/Autoloading with XSUBs>.
	38
954c1994 GS	39	=cut
	40	*/
	41
3ae1b226 NC	42	#ifndef PERL_CORE
	43	# define Nullcv Null(CV*)
	44	#endif
a5f75d66	45
c68d9564 Z	46	#define CvSTASH(sv) (0+((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_stash)
c68d9564 Z	47	#define CvSTASH_set(cv,st) Perl_cvstash_set(aTHX_ cv, st)
8f629a87 NC	48	#define CvSTART(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_start_u.xcv_start
	49	#define CvROOT(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_root_u.xcv_root
	50	#define CvXSUB(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_root_u.xcv_xsub
	51	#define CvXSUBANY(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_start_u.xcv_xsubany
c9182d9c	52	#define CvGV(sv) Perl_CvGV(aTHX_ (CV *)(sv))
b3f91e91	53	#define CvGV_set(cv,gv) Perl_cvgv_set(aTHX_ cv, gv)
ae77754a	54	#define CvHASGV(cv) cBOOL(SvANY(cv)->xcv_gv_u.xcv_gv)
8f629a87	55	#define CvFILE(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_file
a636914a	56	#ifdef USE_ITHREADS
bad4ae38 FC	57	# define CvFILE_set_from_cop(sv, cop) \
bad4ae38 FC	58	(CvFILE(sv) = savepv(CopFILE(cop)), CvDYNFILE_on(sv))
a636914a	59	#else
bad4ae38 FC	60	# define CvFILE_set_from_cop(sv, cop) \
bad4ae38 FC	61	(CvFILE(sv) = CopFILE(cop), CvDYNFILE_off(sv))
a636914a	62	#endif
9ec2a764	63	#define CvFILEGV(sv) (gv_fetchfile(CvFILE(sv)))
74804ad1	64	#define CvDEPTH(sv) (Perl_CvDEPTH((const CV )sv))
52ec28d5	65	/* For use when you only have a XPVCV, not a real CV.
74804ad1	66	Must be assert protected as in Perl_CvDEPTH before use. */
52ec28d5	67	#define CvDEPTHunsafe(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_depth
eacbb379 DD	68
	69	/* these CvPADLIST/CvRESERVED asserts can be reverted one day, once stabilized */
	70	#define CvPADLIST(sv) ((assert_(!CvISXSUB((CV)(sv))) \
	71	&(((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_padlist_u.xcv_padlist)))
	72	/* CvPADLIST_set is not public API, it can be removed one day, once stabilized */
	73	#ifdef DEBUGGING
e69651e7	74	# define CvPADLIST_set(sv, padlist) Perl_set_padlist((CV*)sv, padlist)
eacbb379 DD	75	#else
	76	# define CvPADLIST_set(sv, padlist) (CvPADLIST(sv) = (padlist))
	77	#endif
db6e00bd DD	78	#define CvHSCXT(sv) (assert_(CvISXSUB((CV)(sv))) \
db6e00bd DD	79	&(((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_padlist_u.xcv_hscxt))
eacbb379 DD	80	#ifdef DEBUGGING
	81	# if PTRSIZE == 8
	82	# define PoisonPADLIST(sv) \
	83	(((XPVCV)MUTABLE_PTR(SvANY(sv)))->xcv_padlist_u.xcv_padlist = (PADLIST )UINT64_C(0xEFEFEFEFEFEFEFEF))
	84	# elif PTRSIZE == 4
	85	# define PoisonPADLIST(sv) \
	86	(((XPVCV)MUTABLE_PTR(SvANY(sv)))->xcv_padlist_u.xcv_padlist = (PADLIST )0xEFEFEFEF)
	87	# else
	88	# error unknown pointer size
	89	# endif
	90	#else
eba7d13f	91	# define PoisonPADLIST(sv) NOOP
eacbb379 DD	92	#endif
eacbb379 DD	93
52ec28d5	94	#define CvOUTSIDE(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_outside
8f629a87	95	#define CvOUTSIDE_SEQ(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_outside_seq
52ec28d5	96	#define CvFLAGS(sv) ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_flags
a5f75d66	97
8fa6a409 FC	98	/* These two are sometimes called on non-CVs */
	99	#define CvPROTO(sv) \
	100	( \
	101	SvPOK(sv) \
	102	? SvTYPE(sv) == SVt_PVCV && CvAUTOLOAD(sv) \
	103	? SvEND(sv)+1 : SvPVX_const(sv) \
	104	: NULL \
	105	)
	106	#define CvPROTOLEN(sv) \
	107	( \
	108	SvPOK(sv) \
	109	? SvTYPE(sv) == SVt_PVCV && CvAUTOLOAD(sv) \
	110	? SvLEN(sv)-SvCUR(sv)-2 \
	111	: SvCUR(sv) \
	112	: 0 \
	113	)
	114
5b4563c8	115	#define CVf_METHOD 0x0001 /* CV is explicitly marked as a method */
c2485e0c NC	116	#define CVf_LVALUE 0x0002 /* CV return value can be used as lvalue */
	117	#define CVf_CONST 0x0004 /* inlinable sub */
	118	#define CVf_ISXSUB 0x0008 /* CV is an XSUB, not pure perl. */
5b4563c8 NC	119
	120	#define CVf_WEAKOUTSIDE 0x0010 /* CvOUTSIDE isn't ref counted */
	121	#define CVf_CLONE 0x0020 /* anon CV uses external lexicals */
	122	#define CVf_CLONED 0x0040 /* a clone of one of those */
cfc1e951	123	#define CVf_ANON 0x0080 /* CV is not pointed to by a GV */
5b4563c8	124	#define CVf_UNIQUE 0x0100 /* sub is only called once (eg PL_main_cv,
1108974d	125	* require, eval). */
5b4563c8	126	#define CVf_NODEBUG 0x0200 /* no DB::sub indirection for this CV
8ebc5c01	127	(esp. useful for special XSUBs) */
cfc1e951	128	#define CVf_CVGV_RC 0x0400 /* CvGV is reference counted */
c6565d4b	129	#if defined(PERL_CORE) \|\| defined(PERL_EXT)
58aef2b3 FC	130	# define CVf_SLABBED 0x0800 /* Holds refcount on op slab */
58aef2b3 FC	131	#endif
f60d17f5	132	#define CVf_DYNFILE 0x1000 /* The filename is malloced */
8fa6a409	133	#define CVf_AUTOLOAD 0x2000 /* SvPVX contains AUTOLOADed sub name */
a0d2bbd5	134	#define CVf_HASEVAL 0x4000 /* contains string eval */
b290562e	135	#define CVf_NAMED 0x8000 /* Has a name HEK */
5bb151a5	136	#define CVf_LEXICAL 0x10000 /* Omit package from name */
956dfca8	137	#define CVf_ANONCONST 0x20000 /* :const - create anonconst op */
7dafbf52	138
d3cea301	139	/* This symbol for optimised communication between toke.c and op.c: */
956dfca8	140	#define CVf_BUILTIN_ATTRS (CVf_METHOD\|CVf_LVALUE\|CVf_ANONCONST)
a5f75d66 AD	141
	142	#define CvCLONE(cv) (CvFLAGS(cv) & CVf_CLONE)
	143	#define CvCLONE_on(cv) (CvFLAGS(cv) \|= CVf_CLONE)
	144	#define CvCLONE_off(cv) (CvFLAGS(cv) &= ~CVf_CLONE)
	145
	146	#define CvCLONED(cv) (CvFLAGS(cv) & CVf_CLONED)
	147	#define CvCLONED_on(cv) (CvFLAGS(cv) \|= CVf_CLONED)
	148	#define CvCLONED_off(cv) (CvFLAGS(cv) &= ~CVf_CLONED)
	149
	150	#define CvANON(cv) (CvFLAGS(cv) & CVf_ANON)
	151	#define CvANON_on(cv) (CvFLAGS(cv) \|= CVf_ANON)
	152	#define CvANON_off(cv) (CvFLAGS(cv) &= ~CVf_ANON)
79072805	153
a2278b6a	154	/* CvEVAL or CvSPECIAL */
07055b4c CS	155	#define CvUNIQUE(cv) (CvFLAGS(cv) & CVf_UNIQUE)
	156	#define CvUNIQUE_on(cv) (CvFLAGS(cv) \|= CVf_UNIQUE)
	157	#define CvUNIQUE_off(cv) (CvFLAGS(cv) &= ~CVf_UNIQUE)
8ebc5c01	158
	159	#define CvNODEBUG(cv) (CvFLAGS(cv) & CVf_NODEBUG)
	160	#define CvNODEBUG_on(cv) (CvFLAGS(cv) \|= CVf_NODEBUG)
	161	#define CvNODEBUG_off(cv) (CvFLAGS(cv) &= ~CVf_NODEBUG)
77a005ab MB	162
	163	#define CvMETHOD(cv) (CvFLAGS(cv) & CVf_METHOD)
	164	#define CvMETHOD_on(cv) (CvFLAGS(cv) \|= CVf_METHOD)
	165	#define CvMETHOD_off(cv) (CvFLAGS(cv) &= ~CVf_METHOD)
	166
cd06dffe GS	167	#define CvLVALUE(cv) (CvFLAGS(cv) & CVf_LVALUE)
	168	#define CvLVALUE_on(cv) (CvFLAGS(cv) \|= CVf_LVALUE)
	169	#define CvLVALUE_off(cv) (CvFLAGS(cv) &= ~CVf_LVALUE)
	170
a2278b6a	171	/* eval or PL_main_cv */
1aff0e91 GS	172	#define CvEVAL(cv) (CvUNIQUE(cv) && !SvFAKE(cv))
	173	#define CvEVAL_on(cv) (CvUNIQUE_on(cv),SvFAKE_off(cv))
	174	#define CvEVAL_off(cv) CvUNIQUE_off(cv)
	175
3c10abe3	176	/* BEGIN\|CHECK\|INIT\|UNITCHECK\|END */
1aff0e91 GS	177	#define CvSPECIAL(cv) (CvUNIQUE(cv) && SvFAKE(cv))
	178	#define CvSPECIAL_on(cv) (CvUNIQUE_on(cv),SvFAKE_on(cv))
	179	#define CvSPECIAL_off(cv) (CvUNIQUE_off(cv),SvFAKE_off(cv))
beab0874 JT	180
	181	#define CvCONST(cv) (CvFLAGS(cv) & CVf_CONST)
	182	#define CvCONST_on(cv) (CvFLAGS(cv) \|= CVf_CONST)
	183	#define CvCONST_off(cv) (CvFLAGS(cv) &= ~CVf_CONST)
a4f1a029	184
7dafbf52 DM	185	#define CvWEAKOUTSIDE(cv) (CvFLAGS(cv) & CVf_WEAKOUTSIDE)
	186	#define CvWEAKOUTSIDE_on(cv) (CvFLAGS(cv) \|= CVf_WEAKOUTSIDE)
	187	#define CvWEAKOUTSIDE_off(cv) (CvFLAGS(cv) &= ~CVf_WEAKOUTSIDE)
	188
d04ba589 NC	189	#define CvISXSUB(cv) (CvFLAGS(cv) & CVf_ISXSUB)
	190	#define CvISXSUB_on(cv) (CvFLAGS(cv) \|= CVf_ISXSUB)
	191	#define CvISXSUB_off(cv) (CvFLAGS(cv) &= ~CVf_ISXSUB)
	192
cfc1e951 DM	193	#define CvCVGV_RC(cv) (CvFLAGS(cv) & CVf_CVGV_RC)
	194	#define CvCVGV_RC_on(cv) (CvFLAGS(cv) \|= CVf_CVGV_RC)
	195	#define CvCVGV_RC_off(cv) (CvFLAGS(cv) &= ~CVf_CVGV_RC)
	196
58aef2b3 FC	197	#ifdef PERL_CORE
	198	# define CvSLABBED(cv) (CvFLAGS(cv) & CVf_SLABBED)
	199	# define CvSLABBED_on(cv) (CvFLAGS(cv) \|= CVf_SLABBED)
	200	# define CvSLABBED_off(cv) (CvFLAGS(cv) &= ~CVf_SLABBED)
	201	#endif
	202
bad4ae38 FC	203	#define CvDYNFILE(cv) (CvFLAGS(cv) & CVf_DYNFILE)
	204	#define CvDYNFILE_on(cv) (CvFLAGS(cv) \|= CVf_DYNFILE)
	205	#define CvDYNFILE_off(cv) (CvFLAGS(cv) &= ~CVf_DYNFILE)
	206
8fa6a409 FC	207	#define CvAUTOLOAD(cv) (CvFLAGS(cv) & CVf_AUTOLOAD)
	208	#define CvAUTOLOAD_on(cv) (CvFLAGS(cv) \|= CVf_AUTOLOAD)
	209	#define CvAUTOLOAD_off(cv) (CvFLAGS(cv) &= ~CVf_AUTOLOAD)
	210
a0d2bbd5 FC	211	#define CvHASEVAL(cv) (CvFLAGS(cv) & CVf_HASEVAL)
	212	#define CvHASEVAL_on(cv) (CvFLAGS(cv) \|= CVf_HASEVAL)
	213	#define CvHASEVAL_off(cv) (CvFLAGS(cv) &= ~CVf_HASEVAL)
	214
b290562e FC	215	#define CvNAMED(cv) (CvFLAGS(cv) & CVf_NAMED)
	216	#define CvNAMED_on(cv) (CvFLAGS(cv) \|= CVf_NAMED)
	217	#define CvNAMED_off(cv) (CvFLAGS(cv) &= ~CVf_NAMED)
	218
5bb151a5 FC	219	#define CvLEXICAL(cv) (CvFLAGS(cv) & CVf_LEXICAL)
	220	#define CvLEXICAL_on(cv) (CvFLAGS(cv) \|= CVf_LEXICAL)
	221	#define CvLEXICAL_off(cv) (CvFLAGS(cv) &= ~CVf_LEXICAL)
	222
956dfca8 FC	223	#define CvANONCONST(cv) (CvFLAGS(cv) & CVf_ANONCONST)
	224	#define CvANONCONST_on(cv) (CvFLAGS(cv) \|= CVf_ANONCONST)
	225	#define CvANONCONST_off(cv) (CvFLAGS(cv) &= ~CVf_ANONCONST)
	226
77004dee NC	227	/* Flags for newXS_flags */
	228	#define XS_DYNAMIC_FILENAME 0x01 /* The filename isn't static */
	229
b290562e FC	230	PERL_STATIC_INLINE HEK *
	231	CvNAME_HEK(CV *sv)
	232	{
	233	return CvNAMED(sv)
	234	? ((XPVCV*)MUTABLE_PTR(SvANY(sv)))->xcv_gv_u.xcv_hek
	235	: 0;
	236	}
79656330 N	237
	238	/* helper for the common pattern:
	239	CvNAMED(sv) ? CvNAME_HEK((CV *)sv) : GvNAME_HEK(CvGV(sv))
	240	*/
	241	#define CvGvNAME_HEK(sv) ( \
	242	CvNAMED((CV*)sv) ? \
	243	((XPVCV)MUTABLE_PTR(SvANY((SV)sv)))->xcv_gv_u.xcv_hek\
	244	: GvNAME_HEK(CvGV( (SV*) sv)) \
	245	)
	246
	247	/* This lowers the reference count of the previous value, but does not
2e800d79 FC	248	increment the reference count of the new value. */
	249	#define CvNAME_HEK_set(cv, hek) ( \
	250	CvNAME_HEK((CV *)(cv)) \
	251	? unshare_hek(SvANY((CV *)(cv))->xcv_gv_u.xcv_hek) \
	252	: (void)0, \
	253	((XPVCV*)MUTABLE_PTR(SvANY(cv)))->xcv_gv_u.xcv_hek = (hek), \
	254	CvNAMED_on(cv) \
	255	)
b290562e	256
7dafbf52	257	/*
7dafbf52 DM	258
	259	=for apidoc m\|bool\|CvWEAKOUTSIDE\|CV *cv
	260
	261	Each CV has a pointer, C<CvOUTSIDE()>, to its lexically enclosing
154e47c8	262	CV (if any). Because pointers to anonymous sub prototypes are
7dafbf52	263	stored in C<&> pad slots, it is a possible to get a circular reference,
154e47c8	264	with the parent pointing to the child and vice-versa. To avoid the
7dafbf52 DM	265	ensuing memory leak, we do not increment the reference count of the CV
7dafbf52 DM	266	pointed to by C<CvOUTSIDE> in the I<one specific instance> that the parent
154e47c8 FC	267	has a C<&> pad slot pointing back to us. In this case, we set the
154e47c8 FC	268	C<CvWEAKOUTSIDE> flag in the child. This allows us to determine under what
7dafbf52 DM	269	circumstances we should decrement the refcount of the parent when freeing
	270	the child.
	271
eeb8d49e	272	There is a further complication with non-closure anonymous subs (i.e. those
154e47c8 FC	273	that do not refer to any lexicals outside that sub). In this case, the
154e47c8 FC	274	anonymous prototype is shared rather than being cloned. This has the
7dafbf52	275	consequence that the parent may be freed while there are still active
dfcfced8	276	children, I<e.g.>,
7dafbf52 DM	277
	278	BEGIN { $a = sub { eval '$x' } }
	279
	280	In this case, the BEGIN is freed immediately after execution since there
	281	are no active references to it: the anon sub prototype has
	282	C<CvWEAKOUTSIDE> set since it's not a closure, and $a points to the same
	283	CV, so it doesn't contribute to BEGIN's refcount either. When $a is
	284	executed, the C<eval '$x'> causes the chain of C<CvOUTSIDE>s to be followed,
	285	and the freed BEGIN is accessed.
	286
	287	To avoid this, whenever a CV and its associated pad is freed, any
	288	C<&> entries in the pad are explicitly removed from the pad, and if the
	289	refcount of the pointed-to anon sub is still positive, then that
154e47c8	290	child's C<CvOUTSIDE> is set to point to its grandparent. This will only
7dafbf52 DM	291	occur in the single specific case of a non-closure anon prototype
	292	having one or more active references (such as C<$a> above).
	293
	294	One other thing to consider is that a CV may be merely undefined
154e47c8	295	rather than freed, eg C<undef &foo>. In this case, its refcount may
7dafbf52 DM	296	not have reached zero, but we still delete its pad and its C<CvROOT> etc.
	297	Since various children may still have their C<CvOUTSIDE> pointing at this
	298	undefined CV, we keep its own C<CvOUTSIDE> for the time being, so that
154e47c8	299	the chain of lexical scopes is unbroken. For example, the following
7dafbf52 DM	300	should print 123:
	301
	302	my $x = 123;
	303	sub tmp { sub { eval '$x' } }
	304	my $a = tmp();
	305	undef &tmp;
	306	print $a->();
	307
	308	=cut
	309	*/
102d3b8a	310
d9088386 Z	311	typedef OP (Perl_call_checker)(pTHX_ OP , GV , SV *);
d9088386 Z	312
aa38f4b1 FC	313	#define CALL_CHECKER_REQUIRE_GV MGf_REQUIRE_GV
aa38f4b1 FC	314
5e881495 FC	315	#define CV_NAME_NOTQUAL 1
5e881495 FC	316
b7acb0a3 FC	317	#ifdef PERL_CORE
	318	# define CV_UNDEF_KEEP_NAME 1
	319	#endif
	320
102d3b8a	321	/*
14d04a33	322	* ex: set ts=8 sts=4 sw=4 et:
102d3b8a	323	*/