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1 | /* av.h |
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2 | * |
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3 | * Copyright (C) 1991, 1992, 1993, 1995, 1996, 1997, 1998, 1999, |
4 | * 2000, 2001, 2002, 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 | |
11 | struct xpvav { |
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12 | char* xav_array; /* pointer to first array element */ |
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13 | SSize_t xav_fill; /* Index of last element present */ |
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14 | SSize_t xav_max; /* max index for which array has space */ |
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15 | IV xof_off; /* ptr is incremented by offset */ |
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16 | NV xnv_nv; /* numeric value, if any */ |
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17 | MAGIC* xmg_magic; /* magic for scalar array */ |
18 | HV* xmg_stash; /* class package */ |
19 | |
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20 | SV** xav_alloc; /* pointer to beginning of C array of SVs */ |
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21 | SV* xav_arylen; |
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22 | }; |
23 | |
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24 | |
25 | /* AVf_REAL is set for all AVs whose xav_array contents are refcounted. |
26 | * Some things like "@_" and the scratchpad list do not set this, to |
27 | * indicate that they are cheating (for efficiency) by not refcounting |
28 | * the AV's contents. |
29 | * |
30 | * AVf_REIFY is only meaningful on such "fake" AVs (i.e. where AVf_REAL |
31 | * is not set). It indicates that the fake AV is capable of becoming |
32 | * real if the array needs to be modified in some way. Functions that |
33 | * modify fake AVs check both flags to call av_reify() as appropriate. |
34 | * |
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35 | * Note that the Perl stack and @DB::args have neither flag set. (Thus, |
36 | * items that go on the stack are never refcounted.) |
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37 | * |
38 | * These internal details are subject to change any time. AV |
39 | * manipulations external to perl should not care about any of this. |
40 | * GSAR 1999-09-10 |
41 | */ |
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42 | |
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43 | /* |
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44 | =head1 Handy Values |
45 | |
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46 | =for apidoc AmU||Nullav |
47 | Null AV pointer. |
48 | |
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49 | =head1 Array Manipulation Functions |
50 | |
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51 | =for apidoc Am|int|AvFILL|AV* av |
52 | Same as C<av_len()>. Deprecated, use C<av_len()> instead. |
53 | |
54 | =cut |
55 | */ |
56 | |
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57 | #define Nullav Null(AV*) |
58 | |
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59 | #define AvARRAY(av) ((SV**)((XPVAV*) SvANY(av))->xav_array) |
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60 | #define AvALLOC(av) ((XPVAV*) SvANY(av))->xav_alloc |
61 | #define AvMAX(av) ((XPVAV*) SvANY(av))->xav_max |
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62 | #define AvFILLp(av) ((XPVAV*) SvANY(av))->xav_fill |
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63 | #define AvARYLEN(av) ((XPVAV*) SvANY(av))->xav_arylen |
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64 | |
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65 | #define AvREAL(av) (SvFLAGS(av) & SVpav_REAL) |
66 | #define AvREAL_on(av) (SvFLAGS(av) |= SVpav_REAL) |
67 | #define AvREAL_off(av) (SvFLAGS(av) &= ~SVpav_REAL) |
68 | #define AvREAL_only(av) (AvREIFY_off(av), SvFLAGS(av) |= SVpav_REAL) |
69 | #define AvREIFY(av) (SvFLAGS(av) & SVpav_REIFY) |
70 | #define AvREIFY_on(av) (SvFLAGS(av) |= SVpav_REIFY) |
71 | #define AvREIFY_off(av) (SvFLAGS(av) &= ~SVpav_REIFY) |
72 | #define AvREIFY_only(av) (AvREAL_off(av), SvFLAGS(av) |= SVpav_REIFY) |
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73 | |
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74 | #define AvREALISH(av) (SvFLAGS(av) & (SVpav_REAL|SVpav_REIFY)) |
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75 | |
76 | #define AvFILL(av) ((SvRMAGICAL((SV *) (av))) \ |
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77 | ? mg_size((SV *) av) : AvFILLp(av)) |
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78 | |
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79 | #define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES" |