3 * Copyright (C) 1991, 1992, 1993, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, by Larry Wall and others
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.
12 SSize_t xav_fill; /* Index of last element present */
13 SSize_t xav_max; /* max index for which array has space */
14 IV xof_off; /* ptr is incremented by offset */
15 NV xnv_nv; /* numeric value, if any */
16 MAGIC* xmg_magic; /* magic for scalar array */
17 HV* xmg_stash; /* class package */
19 SV** xav_alloc; /* pointer to beginning of C array of SVs */
24 /* AVf_REAL is set for all AVs whose xav_array contents are refcounted.
25 * Some things like "@_" and the scratchpad list do not set this, to
26 * indicate that they are cheating (for efficiency) by not refcounting
29 * AVf_REIFY is only meaningful on such "fake" AVs (i.e. where AVf_REAL
30 * is not set). It indicates that the fake AV is capable of becoming
31 * real if the array needs to be modified in some way. Functions that
32 * modify fake AVs check both flags to call av_reify() as appropriate.
34 * Note that the Perl stack and @DB::args have neither flag set. (Thus,
35 * items that go on the stack are never refcounted.)
37 * These internal details are subject to change any time. AV
38 * manipulations external to perl should not care about any of this.
45 =for apidoc AmU||Nullav
48 =head1 Array Manipulation Functions
50 =for apidoc Am|int|AvFILL|AV* av
51 Same as C<av_len()>. Deprecated, use C<av_len()> instead.
56 #define Nullav Null(AV*)
58 #define AvARRAY(av) ((av)->sv_u.sv_array)
59 #define AvALLOC(av) ((XPVAV*) SvANY(av))->xav_alloc
60 #define AvMAX(av) ((XPVAV*) SvANY(av))->xav_max
61 #define AvFILLp(av) ((XPVAV*) SvANY(av))->xav_fill
62 #define AvARYLEN(av) ((XPVAV*) SvANY(av))->xav_arylen
64 #define AvREAL(av) (SvFLAGS(av) & SVpav_REAL)
65 #define AvREAL_on(av) (SvFLAGS(av) |= SVpav_REAL)
66 #define AvREAL_off(av) (SvFLAGS(av) &= ~SVpav_REAL)
67 #define AvREAL_only(av) (AvREIFY_off(av), SvFLAGS(av) |= SVpav_REAL)
68 #define AvREIFY(av) (SvFLAGS(av) & SVpav_REIFY)
69 #define AvREIFY_on(av) (SvFLAGS(av) |= SVpav_REIFY)
70 #define AvREIFY_off(av) (SvFLAGS(av) &= ~SVpav_REIFY)
71 #define AvREIFY_only(av) (AvREAL_off(av), SvFLAGS(av) |= SVpav_REIFY)
73 #define AvREALISH(av) (SvFLAGS(av) & (SVpav_REAL|SVpav_REIFY))
75 #define AvFILL(av) ((SvRMAGICAL((SV *) (av))) \
76 ? mg_size((SV *) av) : AvFILLp(av))
78 #define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES"