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v2.39
include/hashtab.h
207 строк
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Ziyao
Import source from binutils
18 сен 2022, 18:55
18 сен 2022, 18:55
3605144
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/* An expandable hash tables datatype. Copyright (C) 1999-2022 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 ((void *) 0) /* This macro defines reserved value for table entry which contained a deleted element. */ #define HTAB_DELETED_ENTRY ((void *) 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, const void *); extern void htab_remove_elt_with_hash (htab_t, const 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 equality function for null-terminated strings. */ extern int htab_eq_string (const void *, 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 */