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[linux.git] / scripts / include / hashtable.h
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef HASHTABLE_H
3 #define HASHTABLE_H
4
5 #include "array_size.h"
6 #include "list.h"
7
8 #define HASH_SIZE(name) (ARRAY_SIZE(name))
9
10 #define HASHTABLE_DECLARE(name, size)           struct hlist_head name[size]
11
12 #define HASHTABLE_DEFINE(name, size)                                            \
13         HASHTABLE_DECLARE(name, size) =                                         \
14                         { [0 ... ((size) - 1)] = HLIST_HEAD_INIT }
15
16 #define hash_head(table, key)           (&(table)[(key) % HASH_SIZE(table)])
17
18 /**
19  * hash_add - add an object to a hashtable
20  * @table: hashtable to add to
21  * @node: the &struct hlist_node of the object to be added
22  * @key: the key of the object to be added
23  */
24 #define hash_add(table, node, key)                                              \
25         hlist_add_head(node, hash_head(table, key))
26
27 /**
28  * hash_for_each - iterate over a hashtable
29  * @table: hashtable to iterate
30  * @obj: the type * to use as a loop cursor for each entry
31  * @member: the name of the hlist_node within the struct
32  */
33 #define hash_for_each(table, obj, member)                               \
34         for (int _bkt = 0; _bkt < HASH_SIZE(table); _bkt++)             \
35                 hlist_for_each_entry(obj, &table[_bkt], member)
36
37 /**
38  * hash_for_each_possible - iterate over all possible objects hashing to the
39  * same bucket
40  * @table: hashtable to iterate
41  * @obj: the type * to use as a loop cursor for each entry
42  * @member: the name of the hlist_node within the struct
43  * @key: the key of the objects to iterate over
44  */
45 #define hash_for_each_possible(table, obj, member, key)                 \
46         hlist_for_each_entry(obj, hash_head(table, key), member)
47
48 #endif /* HASHTABLE_H */
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