| [3181] | 1 | /* av.h
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| 2 | *
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| 3 | * Copyright (C) 1991, 1992, 1993, 1995, 1996, 1997, 1998, 1999,
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| 4 | * 2000, 2001, 2002, by Larry Wall and others
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| 5 | *
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| 6 | * You may distribute under the terms of either the GNU General Public
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| 7 | * License or the Artistic License, as specified in the README file.
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| 8 | *
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| 9 | */
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| 10 |
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| 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 */
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| 18 | HV* xmg_stash; /* class package */
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| 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 | U8 xav_flags;
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| 23 | };
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| 24 |
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| 25 |
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| 26 | /* AVf_REAL is set for all AVs whose xav_array contents are refcounted.
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| 27 | * Some things like "@_" and the scratchpad list do not set this, to
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| 28 | * indicate that they are cheating (for efficiency) by not refcounting
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| 29 | * the AV's contents.
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| 30 | *
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| 31 | * AVf_REIFY is only meaningful on such "fake" AVs (i.e. where AVf_REAL
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| 32 | * is not set). It indicates that the fake AV is capable of becoming
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| 33 | * real if the array needs to be modified in some way. Functions that
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| 34 | * modify fake AVs check both flags to call av_reify() as appropriate.
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| 35 | *
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| 36 | * Note that the Perl stack and @DB::args have neither flag set. (Thus,
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| 37 | * items that go on the stack are never refcounted.)
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| 38 | *
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| 39 | * These internal details are subject to change any time. AV
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| 40 | * manipulations external to perl should not care about any of this.
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| 41 | * GSAR 1999-09-10
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| 42 | */
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| 43 | #define AVf_REAL 1 /* free old entries */
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| 44 | #define AVf_REIFY 2 /* can become real */
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| 45 |
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| 46 | /* XXX this is not used anywhere */
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| 47 | #define AVf_REUSED 4 /* got undeffed--don't turn old memory into SVs now */
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| 48 |
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| 49 | /*
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| 50 | =head1 Handy Values
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| 51 |
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| 52 | =for apidoc AmU||Nullav
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| 53 | Null AV pointer.
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| 54 |
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| 55 | =head1 Array Manipulation Functions
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| 56 |
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| 57 | =for apidoc Am|int|AvFILL|AV* av
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| 58 | Same as C<av_len()>. Deprecated, use C<av_len()> instead.
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| 59 |
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| 60 | =cut
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| 61 | */
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| 62 |
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| 63 | #define Nullav Null(AV*)
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| 64 |
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| 65 | #define AvARRAY(av) ((SV**)((XPVAV*) SvANY(av))->xav_array)
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| 66 | #define AvALLOC(av) ((XPVAV*) SvANY(av))->xav_alloc
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| 67 | #define AvMAX(av) ((XPVAV*) SvANY(av))->xav_max
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| 68 | #define AvFILLp(av) ((XPVAV*) SvANY(av))->xav_fill
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| 69 | #define AvARYLEN(av) ((XPVAV*) SvANY(av))->xav_arylen
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| 70 | #define AvFLAGS(av) ((XPVAV*) SvANY(av))->xav_flags
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| 71 |
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| 72 | #define AvREAL(av) (AvFLAGS(av) & AVf_REAL)
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| 73 | #define AvREAL_on(av) (AvFLAGS(av) |= AVf_REAL)
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| 74 | #define AvREAL_off(av) (AvFLAGS(av) &= ~AVf_REAL)
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| 75 | #define AvREIFY(av) (AvFLAGS(av) & AVf_REIFY)
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| 76 | #define AvREIFY_on(av) (AvFLAGS(av) |= AVf_REIFY)
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| 77 | #define AvREIFY_off(av) (AvFLAGS(av) &= ~AVf_REIFY)
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| 78 | #define AvREUSED(av) (AvFLAGS(av) & AVf_REUSED)
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| 79 | #define AvREUSED_on(av) (AvFLAGS(av) |= AVf_REUSED)
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| 80 | #define AvREUSED_off(av) (AvFLAGS(av) &= ~AVf_REUSED)
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| 81 |
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| 82 | #define AvREALISH(av) (AvFLAGS(av) & (AVf_REAL|AVf_REIFY))
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| 83 |
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| 84 | #define AvFILL(av) ((SvRMAGICAL((SV *) (av))) \
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| 85 | ? mg_size((SV *) av) : AvFILLp(av))
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| 86 |
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| 87 | #define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES"
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