File: gv.h

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/*    gv.h
 *
 *    Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 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.
 *
 */

struct gp {
    SV *	gp_sv;		/* scalar value */
    struct io *	gp_io;		/* filehandle value */
    CV *	gp_cv;		/* subroutine value */
    U32		gp_cvgen;	/* generational validity of cached gp_cv */
    U32		gp_refcnt;	/* how many globs point to this? */
    HV *	gp_hv;		/* hash value */
    AV *	gp_av;		/* array value */
    CV *	gp_form;	/* format value */
    GV *	gp_egv;		/* effective gv, if *glob */
    PERL_BITFIELD32 gp_line:31;	/* line first declared at (for -w) */
    PERL_BITFIELD32 gp_flags:1;
    HEK *	gp_file_hek;	/* file first declared in (for -w) */
};

#define GvXPVGV(gv)	((XPVGV*)SvANY(gv))


#if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN) && !defined(__INTEL_COMPILER)
#  define GvGP(gv)							\
	(0+(*({GV *const _gvgp = (GV *) (gv);				\
	    assert(SvTYPE(_gvgp) == SVt_PVGV || SvTYPE(_gvgp) == SVt_PVLV); \
	    assert(isGV_with_GP(_gvgp));				\
	    &((_gvgp)->sv_u.svu_gp);})))
#  define GvGP_set(gv,gp)						\
	{GV *const _gvgp = (GV *) (gv);				\
	    assert(SvTYPE(_gvgp) == SVt_PVGV || SvTYPE(_gvgp) == SVt_PVLV); \
	    assert(isGV_with_GP(_gvgp));				\
	    (_gvgp)->sv_u.svu_gp = (gp); }
#  define GvFLAGS(gv)							\
	(*({GV *const _gvflags = (GV *) (gv);				\
	    assert(SvTYPE(_gvflags) == SVt_PVGV || SvTYPE(_gvflags) == SVt_PVLV); \
	    assert(isGV_with_GP(_gvflags));				\
	    &(GvXPVGV(_gvflags)->xpv_cur);}))
#  define GvSTASH(gv)							\
	(*({ GV * const _gvstash = (GV *) (gv);				\
	    assert(isGV_with_GP(_gvstash));				\
	    assert(SvTYPE(_gvstash) == SVt_PVGV || SvTYPE(_gvstash) >= SVt_PVLV); \
	    &(GvXPVGV(_gvstash)->xnv_u.xgv_stash);			\
	 }))
#  define GvNAME_HEK(gv)						\
    (*({ GV * const _gvname_hek = (GV *) (gv);				\
	   assert(isGV_with_GP(_gvname_hek));				\
	   assert(SvTYPE(_gvname_hek) == SVt_PVGV || SvTYPE(_gvname_hek) >= SVt_PVLV); \
	   assert(!SvVALID(_gvname_hek));				\
	   &(GvXPVGV(_gvname_hek)->xiv_u.xivu_namehek);			\
	 }))
#  define GvNAME_get(gv)	({ assert(GvNAME_HEK(gv)); (char *)HEK_KEY(GvNAME_HEK(gv)); })
#  define GvNAMELEN_get(gv)	({ assert(GvNAME_HEK(gv)); HEK_LEN(GvNAME_HEK(gv)); })
#  define GvNAMEUTF8(gv)	({ assert(GvNAME_HEK(gv)); HEK_UTF8(GvNAME_HEK(gv)); })
#else
#  define GvGP(gv)	(0+(gv)->sv_u.svu_gp)
#  define GvGP_set(gv,gp)	((gv)->sv_u.svu_gp = (gp))
#  define GvFLAGS(gv)	(GvXPVGV(gv)->xpv_cur)
#  define GvSTASH(gv)	(GvXPVGV(gv)->xnv_u.xgv_stash)
#  define GvNAME_HEK(gv)	(GvXPVGV(gv)->xiv_u.xivu_namehek)
#  define GvNAME_get(gv)	HEK_KEY(GvNAME_HEK(gv))
#  define GvNAMELEN_get(gv)	HEK_LEN(GvNAME_HEK(gv))
#  define GvNAMEUTF8(gv)	HEK_UTF8(GvNAME_HEK(gv))
#endif

#define GvNAME(gv)	GvNAME_get(gv)
#define GvNAMELEN(gv)	GvNAMELEN_get(gv)

/*
=head1 GV Functions

=for apidoc Am|SV*|GvSV|GV* gv

Return the SV from the GV.

=for apidoc Am|AV*|GvAV|GV* gv

Return the AV from the GV.

=for apidoc Am|HV*|GvHV|GV* gv

Return the HV from the GV.

=for apidoc Am|CV*|GvCV|GV* gv

Return the CV from the GV.

=cut
*/

#define GvSV(gv)	(GvGP(gv)->gp_sv)
#ifdef PERL_DONT_CREATE_GVSV
#define GvSVn(gv)	(*(GvGP(gv)->gp_sv ? \
			 &(GvGP(gv)->gp_sv) : \
			 &(GvGP(gv_SVadd(gv))->gp_sv)))
#else
#define GvSVn(gv)	GvSV(gv)
#endif

#define GvREFCNT(gv)	(GvGP(gv)->gp_refcnt)
#define GvIO(gv)                         \
 (                                        \
     (gv)                                  \
  && (                                      \
         SvTYPE((const SV*)(gv)) == SVt_PVGV \
      || SvTYPE((const SV*)(gv)) == SVt_PVLV  \
     )                                         \
  && GvGP(gv)                                   \
   ? GvIOp(gv)                                   \
   : NULL                                         \
 )
#define GvIOp(gv)	(GvGP(gv)->gp_io)
#define GvIOn(gv)	(GvIO(gv) ? GvIOp(gv) : GvIOp(gv_IOadd(gv)))

#define GvFORM(gv)	(GvGP(gv)->gp_form)
#define GvAV(gv)	(GvGP(gv)->gp_av)

#define GvAVn(gv)	(GvGP(gv)->gp_av ? \
			 GvGP(gv)->gp_av : \
			 GvGP(gv_AVadd(gv))->gp_av)
#define GvHV(gv)	((GvGP(gv))->gp_hv)

#define GvHVn(gv)	(GvGP(gv)->gp_hv ? \
			 GvGP(gv)->gp_hv : \
			 GvGP(gv_HVadd(gv))->gp_hv)

#define GvCV(gv)	(0+GvGP(gv)->gp_cv)
#define GvCV_set(gv,cv)	(GvGP(gv)->gp_cv = (cv))
#define GvCVGEN(gv)	(GvGP(gv)->gp_cvgen)
#define GvCVu(gv)	(GvGP(gv)->gp_cvgen ? NULL : GvGP(gv)->gp_cv)

#define GvGPFLAGS(gv)	(GvGP(gv)->gp_flags)

#define GvLINE(gv)	(GvGP(gv)->gp_line)
#define GvFILE_HEK(gv)	(GvGP(gv)->gp_file_hek)
#define GvFILEx(gv)	HEK_KEY(GvFILE_HEK(gv))
#define GvFILE(gv)	(GvFILE_HEK(gv) ? GvFILEx(gv) : NULL)
#define GvFILEGV(gv)	(GvFILE_HEK(gv) ? gv_fetchfile(GvFILEx(gv)) : NULL)

#define GvEGV(gv)	(GvGP(gv)->gp_egv)
#define GvEGVx(gv)	(isGV_with_GP(gv) ? GvEGV(gv) : NULL)
#define GvENAME(gv)	GvNAME(GvEGV(gv) ? GvEGV(gv) : gv)
#define GvENAMELEN(gv)  GvNAMELEN(GvEGV(gv) ? GvEGV(gv) : gv)
#define GvENAMEUTF8(gv) GvNAMEUTF8(GvEGV(gv) ? GvEGV(gv) : gv)
#define GvENAME_HEK(gv) GvNAME_HEK(GvEGV(gv) ? GvEGV(gv) : gv)
#define GvESTASH(gv)	GvSTASH(GvEGV(gv) ? GvEGV(gv) : gv)

/* GVf_INTRO is one-shot flag which indicates that the next assignment
   of a reference to the glob is to be localised; it distinguishes
   'local *g = $ref' from '*g = $ref'.
*/
#define GVf_INTRO	0x01
#define GVf_MULTI	0x02
#define GVf_ASSUMECV	0x04
/*	UNUSED		0x08 */
#define GVf_IMPORTED	0xF0
#define GVf_IMPORTED_SV	  0x10
#define GVf_IMPORTED_AV	  0x20
#define GVf_IMPORTED_HV	  0x40
#define GVf_IMPORTED_CV	  0x80

#define GvINTRO(gv)		(GvFLAGS(gv) & GVf_INTRO)
#define GvINTRO_on(gv)		(GvFLAGS(gv) |= GVf_INTRO)
#define GvINTRO_off(gv)		(GvFLAGS(gv) &= ~GVf_INTRO)

#define GvMULTI(gv)		(GvFLAGS(gv) & GVf_MULTI)
#define GvMULTI_on(gv)		(GvFLAGS(gv) |= GVf_MULTI)
#define GvMULTI_off(gv)		(GvFLAGS(gv) &= ~GVf_MULTI)

#define GvASSUMECV(gv)		(GvFLAGS(gv) & GVf_ASSUMECV)
#define GvASSUMECV_on(gv)	(GvFLAGS(gv) |= GVf_ASSUMECV)
#define GvASSUMECV_off(gv)	(GvFLAGS(gv) &= ~GVf_ASSUMECV)

#define GvIMPORTED(gv)		(GvFLAGS(gv) & GVf_IMPORTED)
#define GvIMPORTED_on(gv)	(GvFLAGS(gv) |= GVf_IMPORTED)
#define GvIMPORTED_off(gv)	(GvFLAGS(gv) &= ~GVf_IMPORTED)

#define GvIMPORTED_SV(gv)	(GvFLAGS(gv) & GVf_IMPORTED_SV)
#define GvIMPORTED_SV_on(gv)	(GvFLAGS(gv) |= GVf_IMPORTED_SV)
#define GvIMPORTED_SV_off(gv)	(GvFLAGS(gv) &= ~GVf_IMPORTED_SV)

#define GvIMPORTED_AV(gv)	(GvFLAGS(gv) & GVf_IMPORTED_AV)
#define GvIMPORTED_AV_on(gv)	(GvFLAGS(gv) |= GVf_IMPORTED_AV)
#define GvIMPORTED_AV_off(gv)	(GvFLAGS(gv) &= ~GVf_IMPORTED_AV)

#define GvIMPORTED_HV(gv)	(GvFLAGS(gv) & GVf_IMPORTED_HV)
#define GvIMPORTED_HV_on(gv)	(GvFLAGS(gv) |= GVf_IMPORTED_HV)
#define GvIMPORTED_HV_off(gv)	(GvFLAGS(gv) &= ~GVf_IMPORTED_HV)

#define GvIMPORTED_CV(gv)	(GvFLAGS(gv) & GVf_IMPORTED_CV)
#define GvIMPORTED_CV_on(gv)	(GvFLAGS(gv) |= GVf_IMPORTED_CV)
#define GvIMPORTED_CV_off(gv)	(GvFLAGS(gv) &= ~GVf_IMPORTED_CV)

#ifndef PERL_CORE
#  define GvIN_PAD(gv)		0
#  define GvIN_PAD_on(gv)	NOOP
#  define GvIN_PAD_off(gv)	NOOP
#  define Nullgv Null(GV*)
#endif

#define DM_RUID      0x001
#define DM_EUID      0x002
#define DM_UID       (DM_RUID|DM_EUID)
#define DM_ARRAY_ISA 0x004
#define DM_RGID      0x010
#define DM_EGID      0x020
#define DM_GID       (DM_RGID|DM_EGID)
#define DM_DELAY     0x100

/*
 * symbol creation flags, for use in gv_fetchpv() and get_*v()
 */
#define GV_ADD		0x01	/* add, if symbol not already there
				   For gv_name_set, adding a HEK for the first
				   time, so don't try to free what's there.  */
#define GV_ADDMULTI	0x02	/* add, pretending it has been added
				   already; used also by gv_init_* */
#define GV_ADDWARN	0x04	/* add, but warn if symbol wasn't already there */
		/*	0x08	   UNUSED */
#define GV_NOINIT	0x10	/* add, but don't init symbol, if type != PVGV */
/* This is used by toke.c to avoid turing placeholder constants in the symbol
   table into full PVGVs with attached constant subroutines.  */
#define GV_NOADD_NOINIT	0x20	/* Don't add the symbol if it's not there.
				   Don't init it if it is there but ! PVGV */
#define GV_NOEXPAND	0x40	/* Don't expand SvOK() entries to PVGV */
#define GV_NOTQUAL	0x80	/* A plain symbol name, not qualified with a
				   package (so skip checks for :: and ')  */
#define GV_AUTOLOAD	0x100	/* gv_fetchmethod_flags() should AUTOLOAD  */
#define GV_CROAK	0x200	/* gv_fetchmethod_flags() should croak  */
#define GV_ADDMG	0x400	/* add if magical */
#define GV_NO_SVGMAGIC	0x800	/* Skip get-magic on an SV argument;
				   used only by gv_fetchsv(_nomg) */
#define GV_CACHE_ONLY	0x1000  /* return stash only if found in cache;
				   used only in flags parameter to gv_stash* family */

/* Flags for gv_fetchmeth_pvn and gv_autoload_pvn*/
#define GV_SUPER	0x1000	/* SUPER::method */

/* Flags for gv_autoload_*/
#define GV_AUTOLOAD_ISMETHOD 1	/* autoloading a method? */

/*      SVf_UTF8 (more accurately the return value from SvUTF8) is also valid
	as a flag to various gv_* functions, so ensure it lies
	outside this range.
*/

#define GV_NOADD_MASK \
  (SVf_UTF8|GV_NOADD_NOINIT|GV_NOEXPAND|GV_NOTQUAL|GV_ADDMG|GV_NO_SVGMAGIC)
/* The bit flags that don't cause gv_fetchpv() to add a symbol if not
   found (with the exception GV_ADDMG, which *might* cause the symbol
   to be added) */

#define gv_fullname3(sv,gv,prefix) gv_fullname4(sv,gv,prefix,TRUE)
#define gv_efullname3(sv,gv,prefix) gv_efullname4(sv,gv,prefix,TRUE)
#define gv_fetchmethod(stash, name) gv_fetchmethod_autoload(stash, name, TRUE)
#define gv_fetchsv_nomg(n,f,t) gv_fetchsv(n,(f)|GV_NO_SVGMAGIC,t)
#define gv_init(gv,stash,name,len,multi) \
	gv_init_pvn(gv,stash,name,len,GV_ADDMULTI*!!(multi))
#define gv_fetchmeth(stash,name,len,level) gv_fetchmeth_pvn(stash, name, len, level, 0)
#define gv_fetchmeth_autoload(stash,name,len,level) gv_fetchmeth_pvn_autoload(stash, name, len, level, 0)
#define gv_fetchmethod_flags(stash,name,flags) gv_fetchmethod_pv_flags(stash, name, flags)
#define gv_autoload4(stash, name, len, method) \
	gv_autoload_pvn(stash, name, len, !!(method))
#define newGVgen(pack)  newGVgen_flags(pack, 0)
#define gv_method_changed(gv)		    \
    (					     \
    	assert_(isGV_with_GP(gv))	      \
	GvREFCNT(gv) > 1		       \
	    ? (void)++PL_sub_generation		\
	    : mro_method_changed_in(GvSTASH(gv)) \
    )

#define gv_AVadd(gv) gv_add_by_type((gv), SVt_PVAV)
#define gv_HVadd(gv) gv_add_by_type((gv), SVt_PVHV)
#define gv_IOadd(gv) gv_add_by_type((gv), SVt_PVIO)
#define gv_SVadd(gv) gv_add_by_type((gv), SVt_NULL)

/*
 * ex: set ts=8 sts=4 sw=4 et:
 */