| 1 | /* This file is part of the program psim. |
| 2 | |
| 3 | Copyright (C) 1994-1995,1997, Andrew Cagney <cagney@highland.com.au> |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | |
| 22 | #ifndef _CAP_C_ |
| 23 | #define _CAP_C_ |
| 24 | |
| 25 | #include "cap.h" |
| 26 | |
| 27 | typedef struct _cap_mapping cap_mapping; |
| 28 | struct _cap_mapping { |
| 29 | unsigned_cell external; |
| 30 | void *internal; |
| 31 | cap_mapping *next; |
| 32 | }; |
| 33 | |
| 34 | struct _cap { |
| 35 | int nr_mappings; |
| 36 | cap_mapping *mappings; |
| 37 | }; |
| 38 | |
| 39 | INLINE_CAP\ |
| 40 | (cap *) |
| 41 | cap_create(const char *key) |
| 42 | { |
| 43 | return ZALLOC(cap); |
| 44 | } |
| 45 | |
| 46 | INLINE_CAP\ |
| 47 | (void) |
| 48 | cap_init(cap *db) |
| 49 | { |
| 50 | cap_mapping *current_map = db->mappings; |
| 51 | if (current_map != NULL) { |
| 52 | db->nr_mappings = db->mappings->external; |
| 53 | /* verify that the mappings that were not removed are in sequence |
| 54 | down to nr 1 */ |
| 55 | while (current_map->next != NULL) { |
| 56 | if (current_map->external != current_map->next->external + 1) |
| 57 | error("cap: cap database possibly corrupt"); |
| 58 | current_map = current_map->next; |
| 59 | } |
| 60 | ASSERT(current_map->next == NULL); |
| 61 | if (current_map->external != 1) |
| 62 | error("cap: cap database possibly currupt"); |
| 63 | } |
| 64 | else { |
| 65 | db->nr_mappings = 0; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | INLINE_CAP\ |
| 70 | (void *) |
| 71 | cap_internal(cap *db, |
| 72 | signed_cell external) |
| 73 | { |
| 74 | cap_mapping *current_map = db->mappings; |
| 75 | while (current_map != NULL) { |
| 76 | if (current_map->external == external) |
| 77 | return current_map->internal; |
| 78 | current_map = current_map->next; |
| 79 | } |
| 80 | return (void*)0; |
| 81 | } |
| 82 | |
| 83 | INLINE_CAP\ |
| 84 | (signed_cell) |
| 85 | cap_external(cap *db, |
| 86 | void *internal) |
| 87 | { |
| 88 | cap_mapping *current_map = db->mappings; |
| 89 | while (current_map != NULL) { |
| 90 | if (current_map->internal == internal) |
| 91 | return current_map->external; |
| 92 | current_map = current_map->next; |
| 93 | } |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | INLINE_CAP\ |
| 98 | (void) |
| 99 | cap_add(cap *db, |
| 100 | void *internal) |
| 101 | { |
| 102 | if (cap_external(db, internal) != 0) { |
| 103 | error("cap: attempting to add an object already in the data base"); |
| 104 | } |
| 105 | else { |
| 106 | /* insert at the front making things in decending order */ |
| 107 | cap_mapping *new_map = ZALLOC(cap_mapping); |
| 108 | new_map->next = db->mappings; |
| 109 | new_map->internal = internal; |
| 110 | db->nr_mappings += 1; |
| 111 | new_map->external = db->nr_mappings; |
| 112 | db->mappings = new_map; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | INLINE_CAP\ |
| 117 | (void) |
| 118 | cap_remove(cap *db, |
| 119 | void *internal) |
| 120 | { |
| 121 | cap_mapping **current_map = &db->mappings; |
| 122 | while (*current_map != NULL) { |
| 123 | if ((*current_map)->internal == internal) { |
| 124 | cap_mapping *delete = *current_map; |
| 125 | *current_map = delete->next; |
| 126 | zfree(delete); |
| 127 | return; |
| 128 | } |
| 129 | current_map = &(*current_map)->next; |
| 130 | } |
| 131 | error("cap: attempt to remove nonexistant internal object"); |
| 132 | } |
| 133 | |
| 134 | #endif |