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1 | /* av.h |
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2 | * |
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3 | * Copyright (c) 1991-1999, Larry Wall |
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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 | * |
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8 | */ |
| 9 | |
| 10 | struct xpvav { |
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11 | char* xav_array; /* pointer to first array element */ |
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12 | SSize_t xav_fill; /* Index of last element present */ |
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13 | SSize_t xav_max; /* max index for which array has space */ |
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14 | IV xof_off; /* ptr is incremented by offset */ |
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15 | NV xnv_nv; /* numeric value, if any */ |
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16 | MAGIC* xmg_magic; /* magic for scalar array */ |
| 17 | HV* xmg_stash; /* class package */ |
| 18 | |
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19 | SV** xav_alloc; /* pointer to malloced string */ |
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20 | SV* xav_arylen; |
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21 | U8 xav_flags; |
| 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 | * |
| 35 | * Note that the Perl stack has neither flag set. (Thus, items that go |
| 36 | * 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 | */ |
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42 | #define AVf_REAL 1 /* free old entries */ |
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43 | #define AVf_REIFY 2 /* can become real */ |
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44 | |
| 45 | /* XXX this is not used anywhere */ |
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46 | #define AVf_REUSED 4 /* got undeffed--don't turn old memory into SVs now */ |
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47 | |
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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 | |
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58 | #define Nullav Null(AV*) |
| 59 | |
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60 | #define AvARRAY(av) ((SV**)((XPVAV*) SvANY(av))->xav_array) |
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61 | #define AvALLOC(av) ((XPVAV*) SvANY(av))->xav_alloc |
| 62 | #define AvMAX(av) ((XPVAV*) SvANY(av))->xav_max |
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63 | #define AvFILLp(av) ((XPVAV*) SvANY(av))->xav_fill |
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64 | #define AvARYLEN(av) ((XPVAV*) SvANY(av))->xav_arylen |
| 65 | #define AvFLAGS(av) ((XPVAV*) SvANY(av))->xav_flags |
| 66 | |
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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) |
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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) |
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76 | |
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77 | #define AvREALISH(av) (AvFLAGS(av) & (AVf_REAL|AVf_REIFY)) |
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78 | |
| 79 | #define AvFILL(av) ((SvRMAGICAL((SV *) (av))) \ |
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80 | ? mg_size((SV *) av) : AvFILLp(av)) |
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81 | |
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