lib/perl5/5.6.1/msys/CORE/av.h

   1 /*    av.h
   2  *
   3  *    Copyright (c) 1991-2001, Larry Wall
   4  *
   5  *    You may distribute under the terms of either the GNU General Public
   6  *    License or the Artistic License, as specified in the README file.
   7  *
   8  */
   9
  10 struct xpvav {
  11     char*       xav_array;      /* pointer to first array element */
  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 */
  18
  19     SV**        xav_alloc;      /* pointer to malloced string */
  20     SV*         xav_arylen;
  21     U8          xav_flags;
  22 };
  23
  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  *
  35  * Note that the Perl stack and @DB::args have neither flag set. (Thus,
  36  * items that go on the stack are never refcounted.)
  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  */
  42 #define AVf_REAL 1      /* free old entries */
  43 #define AVf_REIFY 2     /* can become real */
  44
  45 /* XXX this is not used anywhere */
  46 #define AVf_REUSED 4    /* got undeffed--don't turn old memory into SVs now */
  47
  48 /*
  49 =for apidoc AmU||Nullav
  50 Null AV pointer.
  51
  52 =for apidoc Am|int|AvFILL|AV* av
  53 Same as C<av_len()>.  Deprecated, use C<av_len()> instead.
  54
  55 =cut
  56 */
  57
  58 #define Nullav Null(AV*)
  59
  60 #define AvARRAY(av)     ((SV**)((XPVAV*)  SvANY(av))->xav_array)
  61 #define AvALLOC(av)     ((XPVAV*)  SvANY(av))->xav_alloc
  62 #define AvMAX(av)       ((XPVAV*)  SvANY(av))->xav_max
  63 #define AvFILLp(av)     ((XPVAV*)  SvANY(av))->xav_fill
  64 #define AvARYLEN(av)    ((XPVAV*)  SvANY(av))->xav_arylen
  65 #define AvFLAGS(av)     ((XPVAV*)  SvANY(av))->xav_flags
  66
  67 #define AvREAL(av)      (AvFLAGS(av) & AVf_REAL)
  68 #define AvREAL_on(av)   (AvFLAGS(av) |= AVf_REAL)
  69 #define AvREAL_off(av)  (AvFLAGS(av) &= ~AVf_REAL)
  70 #define AvREIFY(av)     (AvFLAGS(av) & AVf_REIFY)
  71 #define AvREIFY_on(av)  (AvFLAGS(av) |= AVf_REIFY)
  72 #define AvREIFY_off(av) (AvFLAGS(av) &= ~AVf_REIFY)
  73 #define AvREUSED(av)    (AvFLAGS(av) & AVf_REUSED)
  74 #define AvREUSED_on(av) (AvFLAGS(av) |= AVf_REUSED)
  75 #define AvREUSED_off(av) (AvFLAGS(av) &= ~AVf_REUSED)
  76
  77 #define AvREALISH(av)   (AvFLAGS(av) & (AVf_REAL|AVf_REIFY))
  78
  79 #define AvFILL(av)      ((SvRMAGICAL((SV *) (av))) \
  80                           ? mg_size((SV *) av) : AvFILLp(av))
  81