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Reinstate space optimisations to SV body structures.
[perl5.git] / av.h
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a0d0e21e 1/* av.h
79072805 2 *
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3 * Copyright (C) 1991, 1992, 1993, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2005, 2006, 2007, 2008, by Larry Wall and others
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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 *
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9 */
10
11struct xpvav {
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12 HV* xmg_stash; /* class package */
13 union _xmgu xmg_u;
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14 SSize_t xav_fill; /* Index of last element present */
15 SSize_t xav_max; /* max index for which array has space */
6e128786 16 union _xivu xiv_u;
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17};
18
e4305a63 19/* SV** xav_alloc; */
311a25d9 20#define xav_alloc xiv_u.xivu_p1
e4305a63 21/* SV* xav_arylen; */
61b858cf 22
8c18259e 23/* SVpav_REAL is set for all AVs whose xav_array contents are refcounted.
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24 * Some things like "@_" and the scratchpad list do not set this, to
25 * indicate that they are cheating (for efficiency) by not refcounting
26 * the AV's contents.
27 *
8c18259e 28 * SVpav_REIFY is only meaningful on such "fake" AVs (i.e. where SVpav_REAL
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29 * is not set). It indicates that the fake AV is capable of becoming
30 * real if the array needs to be modified in some way. Functions that
31 * modify fake AVs check both flags to call av_reify() as appropriate.
32 *
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33 * Note that the Perl stack and @DB::args have neither flag set. (Thus,
34 * items that go on the stack are never refcounted.)
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35 *
36 * These internal details are subject to change any time. AV
37 * manipulations external to perl should not care about any of this.
38 * GSAR 1999-09-10
39 */
79072805 40
954c1994 41/*
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42=head1 Handy Values
43
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44=for apidoc AmU||Nullav
45Null AV pointer.
46
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47(deprecated - use C<(AV *)NULL> instead)
48
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49=head1 Array Manipulation Functions
50
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51=for apidoc Am|int|AvFILL|AV* av
52Same as C<av_len()>. Deprecated, use C<av_len()> instead.
53
54=cut
55*/
56
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57#ifndef PERL_CORE
58# define Nullav Null(AV*)
59#endif
79072805 60
339049b0 61#define AvARRAY(av) ((av)->sv_u.svu_array)
e4305a63 62#define AvALLOC(av) (*((SV***)&((XPVAV*) SvANY(av))->xav_alloc))
79072805 63#define AvMAX(av) ((XPVAV*) SvANY(av))->xav_max
93965878 64#define AvFILLp(av) ((XPVAV*) SvANY(av))->xav_fill
a062e10d 65#define AvARYLEN(av) (*Perl_av_arylen_p(aTHX_ MUTABLE_AV(av)))
79072805 66
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67#define AvREAL(av) (SvFLAGS(av) & SVpav_REAL)
68#define AvREAL_on(av) (SvFLAGS(av) |= SVpav_REAL)
69#define AvREAL_off(av) (SvFLAGS(av) &= ~SVpav_REAL)
70#define AvREAL_only(av) (AvREIFY_off(av), SvFLAGS(av) |= SVpav_REAL)
71#define AvREIFY(av) (SvFLAGS(av) & SVpav_REIFY)
72#define AvREIFY_on(av) (SvFLAGS(av) |= SVpav_REIFY)
73#define AvREIFY_off(av) (SvFLAGS(av) &= ~SVpav_REIFY)
74#define AvREIFY_only(av) (AvREAL_off(av), SvFLAGS(av) |= SVpav_REIFY)
a0d0e21e 75
11ca45c0 76#define AvREALISH(av) (SvFLAGS(av) & (SVpav_REAL|SVpav_REIFY))
93965878 77
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78#define AvFILL(av) ((SvRMAGICAL((const SV *) (av))) \
79 ? mg_size(MUTABLE_SV(av)) : AvFILLp(av))
a0d0e21e 80
6f12eb6d 81#define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES"
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82
83/*
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84=for apidoc newAV
85
86Creates a new AV. The reference count is set to 1.
87
88=cut
89*/
90
a062e10d 91#define newAV() MUTABLE_AV(newSV_type(SVt_PVAV))
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92
93/*
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94 * Local variables:
95 * c-indentation-style: bsd
96 * c-basic-offset: 4
97 * indent-tabs-mode: t
98 * End:
99 *
100 * ex: set ts=8 sts=4 sw=4 noet:
101 */