/usr/include/libiberty/hashtab.h is in libiberty-dev 20161220-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 | /* An expandable hash tables datatype.
Copyright (C) 1999-2016 Free Software Foundation, Inc.
Contributed by Vladimir Makarov (vmakarov@cygnus.com).
This program 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 2 of the License, or
(at your option) any later version.
This program 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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
/* This package implements basic hash table functionality. It is possible
to search for an entry, create an entry and destroy an entry.
Elements in the table are generic pointers.
The size of the table is not fixed; if the occupancy of the table
grows too high the hash table will be expanded.
The abstract data implementation is based on generalized Algorithm D
from Knuth's book "The art of computer programming". Hash table is
expanded by creation of new hash table and transferring elements from
the old table to the new table. */
#ifndef __HASHTAB_H__
#define __HASHTAB_H__
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#include "ansidecl.h"
/* The type for a hash code. */
typedef unsigned int hashval_t;
/* Callback function pointer types. */
/* Calculate hash of a table entry. */
typedef hashval_t (*htab_hash) (const void *);
/* Compare a table entry with a possible entry. The entry already in
the table always comes first, so the second element can be of a
different type (but in this case htab_find and htab_find_slot
cannot be used; instead the variants that accept a hash value
must be used). */
typedef int (*htab_eq) (const void *, const void *);
/* Cleanup function called whenever a live element is removed from
the hash table. */
typedef void (*htab_del) (void *);
/* Function called by htab_traverse for each live element. The first
arg is the slot of the element (which can be passed to htab_clear_slot
if desired), the second arg is the auxiliary pointer handed to
htab_traverse. Return 1 to continue scan, 0 to stop. */
typedef int (*htab_trav) (void **, void *);
/* Memory-allocation function, with the same functionality as calloc().
Iff it returns NULL, the hash table implementation will pass an error
code back to the user, so if your code doesn't handle errors,
best if you use xcalloc instead. */
typedef void *(*htab_alloc) (size_t, size_t);
/* We also need a free() routine. */
typedef void (*htab_free) (void *);
/* Memory allocation and deallocation; variants which take an extra
argument. */
typedef void *(*htab_alloc_with_arg) (void *, size_t, size_t);
typedef void (*htab_free_with_arg) (void *, void *);
/* This macro defines reserved value for empty table entry. */
#define HTAB_EMPTY_ENTRY ((PTR) 0)
/* This macro defines reserved value for table entry which contained
a deleted element. */
#define HTAB_DELETED_ENTRY ((PTR) 1)
/* Hash tables are of the following type. The structure
(implementation) of this type is not needed for using the hash
tables. All work with hash table should be executed only through
functions mentioned below. The size of this structure is subject to
change. */
struct htab {
/* Pointer to hash function. */
htab_hash hash_f;
/* Pointer to comparison function. */
htab_eq eq_f;
/* Pointer to cleanup function. */
htab_del del_f;
/* Table itself. */
void **entries;
/* Current size (in entries) of the hash table. */
size_t size;
/* Current number of elements including also deleted elements. */
size_t n_elements;
/* Current number of deleted elements in the table. */
size_t n_deleted;
/* The following member is used for debugging. Its value is number
of all calls of `htab_find_slot' for the hash table. */
unsigned int searches;
/* The following member is used for debugging. Its value is number
of collisions fixed for time of work with the hash table. */
unsigned int collisions;
/* Pointers to allocate/free functions. */
htab_alloc alloc_f;
htab_free free_f;
/* Alternate allocate/free functions, which take an extra argument. */
void *alloc_arg;
htab_alloc_with_arg alloc_with_arg_f;
htab_free_with_arg free_with_arg_f;
/* Current size (in entries) of the hash table, as an index into the
table of primes. */
unsigned int size_prime_index;
};
typedef struct htab *htab_t;
/* An enum saying whether we insert into the hash table or not. */
enum insert_option {NO_INSERT, INSERT};
/* The prototypes of the package functions. */
extern htab_t htab_create_alloc (size_t, htab_hash,
htab_eq, htab_del,
htab_alloc, htab_free);
extern htab_t htab_create_alloc_ex (size_t, htab_hash,
htab_eq, htab_del,
void *, htab_alloc_with_arg,
htab_free_with_arg);
extern htab_t htab_create_typed_alloc (size_t, htab_hash, htab_eq, htab_del,
htab_alloc, htab_alloc, htab_free);
/* Backward-compatibility functions. */
extern htab_t htab_create (size_t, htab_hash, htab_eq, htab_del);
extern htab_t htab_try_create (size_t, htab_hash, htab_eq, htab_del);
extern void htab_set_functions_ex (htab_t, htab_hash,
htab_eq, htab_del,
void *, htab_alloc_with_arg,
htab_free_with_arg);
extern void htab_delete (htab_t);
extern void htab_empty (htab_t);
extern void * htab_find (htab_t, const void *);
extern void ** htab_find_slot (htab_t, const void *, enum insert_option);
extern void * htab_find_with_hash (htab_t, const void *, hashval_t);
extern void ** htab_find_slot_with_hash (htab_t, const void *,
hashval_t, enum insert_option);
extern void htab_clear_slot (htab_t, void **);
extern void htab_remove_elt (htab_t, void *);
extern void htab_remove_elt_with_hash (htab_t, void *, hashval_t);
extern void htab_traverse (htab_t, htab_trav, void *);
extern void htab_traverse_noresize (htab_t, htab_trav, void *);
extern size_t htab_size (htab_t);
extern size_t htab_elements (htab_t);
extern double htab_collisions (htab_t);
/* A hash function for pointers. */
extern htab_hash htab_hash_pointer;
/* An equality function for pointers. */
extern htab_eq htab_eq_pointer;
/* A hash function for null-terminated strings. */
extern hashval_t htab_hash_string (const void *);
/* An iterative hash function for arbitrary data. */
extern hashval_t iterative_hash (const void *, size_t, hashval_t);
/* Shorthand for hashing something with an intrinsic size. */
#define iterative_hash_object(OB,INIT) iterative_hash (&OB, sizeof (OB), INIT)
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __HASHTAB_H */
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