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/* av.h |
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* |
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* Copyright (C) 1991, 1992, 1993, 1995, 1996, 1997, 1998, 1999, |
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* 2000, 2001, 2002, by Larry Wall and others |
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* |
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* You may distribute under the terms of either the GNU General Public |
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* License or the Artistic License, as specified in the README file. |
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* |
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*/ |
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struct xpvav { |
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char* xav_array; /* pointer to first array element */ |
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SSize_t xav_fill; /* Index of last element present */ |
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SSize_t xav_max; /* max index for which array has space */ |
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IV xof_off; /* ptr is incremented by offset */ |
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NV xnv_nv; /* numeric value, if any */ |
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MAGIC* xmg_magic; /* magic for scalar array */ |
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HV* xmg_stash; /* class package */ |
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SV** xav_alloc; /* pointer to beginning of C array of SVs */ |
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SV* xav_arylen; |
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U8 xav_flags; |
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}; |
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/* AVf_REAL is set for all AVs whose xav_array contents are refcounted. |
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* Some things like "@_" and the scratchpad list do not set this, to |
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* indicate that they are cheating (for efficiency) by not refcounting |
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* the AV's contents. |
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* |
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* AVf_REIFY is only meaningful on such "fake" AVs (i.e. where AVf_REAL |
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* is not set). It indicates that the fake AV is capable of becoming |
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* real if the array needs to be modified in some way. Functions that |
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* modify fake AVs check both flags to call av_reify() as appropriate. |
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* |
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* Note that the Perl stack and @DB::args have neither flag set. (Thus, |
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* items that go on the stack are never refcounted.) |
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* |
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* These internal details are subject to change any time. AV |
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* manipulations external to perl should not care about any of this. |
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* GSAR 1999-09-10 |
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*/ |
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#define AVf_REAL 1 /* free old entries */ |
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#define AVf_REIFY 2 /* can become real */ |
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/* XXX this is not used anywhere */ |
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#define AVf_REUSED 4 /* got undeffed--don't turn old memory into SVs now */ |
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/* |
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=head1 Handy Values |
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=for apidoc AmU||Nullav |
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Null AV pointer. |
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=head1 Array Manipulation Functions |
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=for apidoc Am|int|AvFILL|AV* av |
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Same as C<av_len()>. Deprecated, use C<av_len()> instead. |
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=cut |
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*/ |
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#define Nullav Null(AV*) |
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#define AvARRAY(av) ((SV**)((XPVAV*) SvANY(av))->xav_array) |
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#define AvALLOC(av) ((XPVAV*) SvANY(av))->xav_alloc |
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#define AvMAX(av) ((XPVAV*) SvANY(av))->xav_max |
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#define AvFILLp(av) ((XPVAV*) SvANY(av))->xav_fill |
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#define AvARYLEN(av) ((XPVAV*) SvANY(av))->xav_arylen |
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#define AvFLAGS(av) ((XPVAV*) SvANY(av))->xav_flags |
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#define AvREAL(av) (AvFLAGS(av) & AVf_REAL) |
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#define AvREAL_on(av) (AvFLAGS(av) |= AVf_REAL) |
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#define AvREAL_off(av) (AvFLAGS(av) &= ~AVf_REAL) |
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#define AvREIFY(av) (AvFLAGS(av) & AVf_REIFY) |
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#define AvREIFY_on(av) (AvFLAGS(av) |= AVf_REIFY) |
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#define AvREIFY_off(av) (AvFLAGS(av) &= ~AVf_REIFY) |
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#define AvREUSED(av) (AvFLAGS(av) & AVf_REUSED) |
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#define AvREUSED_on(av) (AvFLAGS(av) |= AVf_REUSED) |
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#define AvREUSED_off(av) (AvFLAGS(av) &= ~AVf_REUSED) |
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#define AvREALISH(av) (AvFLAGS(av) & (AVf_REAL|AVf_REIFY)) |
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#define AvFILL(av) ((SvRMAGICAL((SV *) (av))) \ |
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? mg_size((SV *) av) : AvFILLp(av)) |
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#define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES" |
