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Diffstat (limited to 'libobjc/objc/hash.h')
| -rw-r--r-- | libobjc/objc/hash.h | 214 |
1 files changed, 1 insertions, 213 deletions
diff --git a/libobjc/objc/hash.h b/libobjc/objc/hash.h index 146abd97faa..8225a0992e4 100644 --- a/libobjc/objc/hash.h +++ b/libobjc/objc/hash.h @@ -1,215 +1,3 @@ -/* Hash tables for Objective C method dispatch. - Copyright (C) 1993, 1995, 1996, 2004, 2009 Free Software Foundation, Inc. - -This file is part of GCC. - -GCC is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 3, or (at your option) -any later version. - -GCC is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -Under Section 7 of GPL version 3, you are granted additional -permissions described in the GCC Runtime Library Exception, version -3.1, as published by the Free Software Foundation. - -You should have received a copy of the GNU General Public License and -a copy of the GCC Runtime Library Exception along with this program; -see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -<http://www.gnu.org/licenses/>. */ - - - -#ifndef __hash_INCLUDE_GNU -#define __hash_INCLUDE_GNU - -#include <stddef.h> -#include <string.h> #include "objc.h" +#include "deprecated/hash.h" -#ifdef __cplusplus -extern "C" { -#endif /* __cplusplus */ - -/* - * This data structure is used to hold items - * stored in a hash table. Each node holds - * a key/value pair. - * - * Items in the cache are really of type void *. - */ -typedef struct cache_node -{ - struct cache_node *next; /* Pointer to next entry on the list. - NULL indicates end of list. */ - const void *key; /* Key used to locate the value. Used - to locate value when more than one - key computes the same hash - value. */ - void *value; /* Value stored for the key. */ -} *node_ptr; - - -/* - * This data type is the function that computes a hash code given a key. - * Therefore, the key can be a pointer to anything and the function specific - * to the key type. - * - * Unfortunately there is a mutual data structure reference problem with this - * typedef. Therefore, to remove compiler warnings the functions passed to - * objc_hash_new will have to be casted to this type. - */ -typedef unsigned int (*hash_func_type) (void *, const void *); - -/* - * This data type is the function that compares two hash keys and returns an - * integer greater than, equal to, or less than 0, according as the first - * parameter is lexicographically greater than, equal to, or less than the - * second. - */ - -typedef int (*compare_func_type) (const void *, const void *); - - -/* - * This data structure is the cache. - * - * It must be passed to all of the hashing routines - * (except for new). - */ -typedef struct cache -{ - /* Variables used to implement the hash itself. */ - node_ptr *node_table; /* Pointer to an array of hash nodes. */ - /* Variables used to track the size of the hash table so to determine - when to resize it. */ - unsigned int size; /* Number of buckets allocated for the hash table - (number of array entries allocated for - "node_table"). Must be a power of two. */ - unsigned int used; /* Current number of entries in the hash table. */ - unsigned int mask; /* Precomputed mask. */ - - /* Variables used to implement indexing through the hash table. */ - - unsigned int last_bucket; /* Tracks which entry in the array where - the last value was returned. */ - /* Function used to compute a hash code given a key. - This function is specified when the hash table is created. */ - hash_func_type hash_func; - /* Function used to compare two hash keys to see if they are equal. */ - compare_func_type compare_func; -} *cache_ptr; - - -/* Two important hash tables. */ -extern cache_ptr module_hash_table, class_hash_table; - -/* Allocate and initialize a hash table. */ - -cache_ptr objc_hash_new (unsigned int size, - hash_func_type hash_func, - compare_func_type compare_func); - -/* Deallocate all of the hash nodes and the cache itself. */ - -void objc_hash_delete (cache_ptr cache); - -/* Add the key/value pair to the hash table. If the - hash table reaches a level of fullness then it will be resized. - - assert if the key is already in the hash. */ - -void objc_hash_add (cache_ptr *cachep, const void *key, void *value); - -/* Remove the key/value pair from the hash table. - assert if the key isn't in the table. */ - -void objc_hash_remove (cache_ptr cache, const void *key); - -/* Used to index through the hash table. Start with NULL - to get the first entry. - - Successive calls pass the value returned previously. - ** Don't modify the hash during this operation *** - - Cache nodes are returned such that key or value can - be extracted. */ - -node_ptr objc_hash_next (cache_ptr cache, node_ptr node); - -/* Used to return a value from a hash table using a given key. */ - -void *objc_hash_value_for_key (cache_ptr cache, const void *key); - -/* Used to determine if the given key exists in the hash table */ - -BOOL objc_hash_is_key_in_hash (cache_ptr cache, const void *key); - -/************************************************ - - Useful hashing functions. - - Declared inline for your pleasure. - -************************************************/ - -/* Calculate a hash code by performing some - manipulation of the key pointer. (Use the lowest bits - except for those likely to be 0 due to alignment.) */ - -static inline unsigned int -objc_hash_ptr (cache_ptr cache, const void *key) -{ - return ((size_t)key / sizeof (void *)) & cache->mask; -} - - -/* Calculate a hash code by iterating over a NULL - terminate string. */ -static inline unsigned int -objc_hash_string (cache_ptr cache, const void *key) -{ - unsigned int ret = 0; - unsigned int ctr = 0; - const char *ckey = (const char *) key; - - while (*ckey) { - ret ^= *ckey++ << ctr; - ctr = (ctr + 1) % sizeof (void *); - } - - return ret & cache->mask; -} - - -/* Compare two pointers for equality. */ -static inline int -objc_compare_ptrs (const void *k1, const void *k2) -{ - return (k1 == k2); -} - - -/* Compare two strings. */ -static inline int -objc_compare_strings (const void *k1, const void *k2) -{ - if (k1 == k2) - return 1; - else if (k1 == 0 || k2 == 0) - return 0; - else - return ! strcmp ((const char *) k1, (const char *) k2); -} - - -#ifdef __cplusplus -} -#endif /* __cplusplus */ - - -#endif /* not __hash_INCLUDE_GNU */ |