| 1 | /* Sparse Arrays for Objective C dispatch tables
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| 2 | Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc.
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| 3 | Contributed by Kresten Krab Thorup.
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| 4 |
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| 5 | This file is part of GNU CC.
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| 6 |
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| 7 | GNU CC is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2, or (at your option)
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| 10 | any later version.
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| 11 |
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| 12 | GNU CC is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with GNU CC; see the file COPYING. If not, write to
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| 19 | the Free Software Foundation, 59 Temple Place - Suite 330,
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| 20 | Boston, MA 02111-1307, USA. */
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| 21 |
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| 22 | /* As a special exception, if you link this library with files
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| 23 | compiled with GCC to produce an executable, this does not cause
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| 24 | the resulting executable to be covered by the GNU General Public License.
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| 25 | This exception does not however invalidate any other reasons why
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| 26 | the executable file might be covered by the GNU General Public License. */
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| 27 |
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| 28 | #ifndef __sarray_INCLUDE_GNU
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| 29 | #define __sarray_INCLUDE_GNU
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| 30 |
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| 31 | #define OBJC_SPARSE2 /* 2-level sparse array */
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| 32 | /* #define OBJC_SPARSE3 */ /* 3-level sparse array */
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| 33 |
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| 34 | #ifdef OBJC_SPARSE2
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| 35 | extern const char* __objc_sparse2_id;
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| 36 | #endif
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| 37 |
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| 38 | #ifdef OBJC_SPARSE3
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| 39 | extern const char* __objc_sparse3_id;
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| 40 | #endif
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| 41 |
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| 42 | #include <stddef.h>
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| 43 |
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| 44 | #include "objc/thr.h"
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| 45 |
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| 46 | extern int nbuckets; /* for stats */
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| 47 | extern int nindices;
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| 48 | extern int narrays;
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| 49 | extern int idxsize;
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| 50 |
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| 51 | #include <assert.h>
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| 52 |
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| 53 | /* An unsigned integer of same size as a pointer */
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| 54 | #define SIZET_BITS (sizeof(size_t)*8)
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| 55 |
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| 56 | #if defined(__sparc__) || defined(OBJC_SPARSE2)
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| 57 | #define PRECOMPUTE_SELECTORS
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| 58 | #endif
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| 59 |
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| 60 | #ifdef OBJC_SPARSE3
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| 61 |
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| 62 | /* Buckets are 8 words each */
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| 63 | #define BUCKET_BITS 3
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| 64 | #define BUCKET_SIZE (1<<BUCKET_BITS)
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| 65 | #define BUCKET_MASK (BUCKET_SIZE-1)
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| 66 |
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| 67 | /* Indices are 16 words each */
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| 68 | #define INDEX_BITS 4
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| 69 | #define INDEX_SIZE (1<<INDEX_BITS)
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| 70 | #define INDEX_MASK (INDEX_SIZE-1)
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| 71 |
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| 72 | #define INDEX_CAPACITY (BUCKET_SIZE*INDEX_SIZE)
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| 73 |
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| 74 | #else /* OBJC_SPARSE2 */
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| 75 |
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| 76 | /* Buckets are 32 words each */
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| 77 | #define BUCKET_BITS 5
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| 78 | #define BUCKET_SIZE (1<<BUCKET_BITS)
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| 79 | #define BUCKET_MASK (BUCKET_SIZE-1)
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| 80 |
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| 81 | #endif /* OBJC_SPARSE2 */
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| 82 |
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| 83 | typedef size_t sidx;
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| 84 |
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| 85 | #ifdef PRECOMPUTE_SELECTORS
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| 86 |
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| 87 | struct soffset {
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| 88 | #ifdef OBJC_SPARSE3
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| 89 | unsigned int unused : SIZET_BITS/4;
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| 90 | unsigned int eoffset : SIZET_BITS/4;
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| 91 | unsigned int boffset : SIZET_BITS/4;
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| 92 | unsigned int ioffset : SIZET_BITS/4;
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| 93 | #else /* OBJC_SPARSE2 */
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| 94 | #ifdef __sparc__
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| 95 | unsigned long boffset : (SIZET_BITS - 2) - BUCKET_BITS;
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| 96 | unsigned int eoffset : BUCKET_BITS;
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| 97 | unsigned int unused : 2;
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| 98 | #else
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| 99 | unsigned int boffset : SIZET_BITS/2;
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| 100 | unsigned int eoffset : SIZET_BITS/2;
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| 101 | #endif
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