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130 lines
4.6 KiB
C
130 lines
4.6 KiB
C
/* Header file for generic hash table support.
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Copyright (C) 1993, 1994, 1997, 1998, 2001 Free Software Foundation, Inc.
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Written by Steve Chamberlain <sac@cygnus.com>
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This file was lifted from BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef IN_GCC
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#include <ansidecl.h>
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#endif /* ! IN_GCC */
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#include "obstack.h"
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typedef PTR hash_table_key;
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/* Hash table routines. There is no way to free up a hash table. */
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/* An element in the hash table. Most uses will actually use a larger
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structure, and an instance of this will be the first field. */
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struct hash_entry
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{
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/* Next entry for this hash code. */
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struct hash_entry *next;
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/* The thing being hashed. */
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hash_table_key key;
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/* Hash code. This is the full hash code, not the index into the
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table. */
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unsigned long hash;
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};
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/* A hash table. */
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struct hash_table
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{
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/* The hash array. */
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struct hash_entry **table;
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/* The number of slots in the hash table. */
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unsigned int size;
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/* A function used to create new elements in the hash table. The
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first entry is itself a pointer to an element. When this
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function is first invoked, this pointer will be NULL. However,
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having the pointer permits a hierarchy of method functions to be
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built each of which calls the function in the superclass. Thus
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each function should be written to allocate a new block of memory
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only if the argument is NULL. */
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struct hash_entry *(*newfunc) PARAMS ((struct hash_entry *,
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struct hash_table *,
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hash_table_key));
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/* A function to compute the hash code for a key in the hash table. */
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unsigned long (*hash) PARAMS ((hash_table_key));
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/* A function to compare two keys. */
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bool (*comp) PARAMS ((hash_table_key, hash_table_key));
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/* An obstack for this hash table. */
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struct obstack memory;
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};
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/* Initialize a hash table. */
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extern void hash_table_init
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PARAMS ((struct hash_table *,
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struct hash_entry *(*) (struct hash_entry *,
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struct hash_table *,
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hash_table_key),
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unsigned long (*hash) (hash_table_key),
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bool (*comp) (hash_table_key, hash_table_key)));
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/* Initialize a hash table specifying a size. */
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extern void hash_table_init_n
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PARAMS ((struct hash_table *,
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struct hash_entry *(*) (struct hash_entry *,
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struct hash_table *,
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hash_table_key),
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unsigned long (*hash) (hash_table_key),
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bool (*comp) (hash_table_key, hash_table_key),
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unsigned int size));
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/* Free up a hash table. */
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extern void hash_table_free PARAMS ((struct hash_table *));
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/* Look up KEY in a hash table. If CREATE is true, a new entry
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will be created for this KEY if one does not already exist. If
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COPY is non-NULL, it is used to copy the KEY before storing it in
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the hash table. */
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extern struct hash_entry *hash_lookup
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PARAMS ((struct hash_table *, hash_table_key key, int create,
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hash_table_key (*copy)(struct obstack*, hash_table_key)));
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/* Base method for creating a hash table entry. */
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extern struct hash_entry *hash_newfunc
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PARAMS ((struct hash_entry *, struct hash_table *,
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hash_table_key key));
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/* Grab some space for a hash table entry. */
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extern PTR hash_allocate PARAMS ((struct hash_table *,
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unsigned int));
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/* Traverse a hash table in a random order, calling a function on each
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element. If the function returns false, the traversal stops. The
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INFO argument is passed to the function. */
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extern void hash_traverse PARAMS ((struct hash_table *,
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bool (*) (struct hash_entry *,
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hash_table_key),
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hash_table_key info));
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/* Hash a string K, which is really of type `char*'. */
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extern unsigned long string_hash PARAMS ((hash_table_key k));
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/* Compare two strings K1, K2 which are really of type `char*'. */
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extern bool string_compare PARAMS ((hash_table_key k1,
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hash_table_key k2));
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/* Copy a string K, which is really of type `char*'. */
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extern hash_table_key string_copy PARAMS ((struct obstack* memory,
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hash_table_key k));
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