URL
https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k
[/] [or1k/] [trunk/] [gdb-5.0/] [include/] [hashtab.h] - Rev 1772
Go to most recent revision | Compare with Previous | Blame | View Log
/* An expandable hash tables datatype. Copyright (C) 1999 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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> /* Callback function pointer types. */ /* Calculate hash of a table entry. */ typedef unsigned int (*htab_hash) PARAMS ((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) PARAMS ((const void *, const void *)); /* Cleanup function called whenever a live element is removed from the hash table. */ typedef void (*htab_del) PARAMS ((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) PARAMS ((void **, void *)); /* 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. */ 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; }; typedef struct htab *htab_t; /* The prototypes of the package functions. */ extern htab_t htab_create PARAMS ((size_t, htab_hash, htab_eq, htab_del)); extern void htab_delete PARAMS ((htab_t)); extern void htab_empty PARAMS ((htab_t)); extern void *htab_find PARAMS ((htab_t, const void *)); extern void **htab_find_slot PARAMS ((htab_t, const void *, int)); extern void *htab_find_with_hash PARAMS ((htab_t, const void *, unsigned int)); extern void **htab_find_slot_with_hash PARAMS ((htab_t, const void *, unsigned int, int)); extern void htab_clear_slot PARAMS ((htab_t, void **)); extern void htab_remove_elt PARAMS ((htab_t, void *)); extern void htab_traverse PARAMS ((htab_t, htab_trav, void *)); extern size_t htab_size PARAMS ((htab_t)); extern size_t htab_elements PARAMS ((htab_t)); extern double htab_collisions PARAMS ((htab_t)); #ifdef __cplusplus } #endif /* __cplusplus */ #endif /* __HASHTAB_H */
Go to most recent revision | Compare with Previous | Blame | View Log