/* hash.c -- hash table routines
- Copyright (C) 1993, 94 Free Software Foundation, Inc.
+ Copyright (C) 1993, 1994, 1998, 2001 Free Software Foundation, Inc.
Written by Steve Chamberlain <sac@cygnus.com>
This file was lifted from BFD, the Binary File Descriptor library.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
#include "config.h"
+#include "system.h"
#include "hash.h"
#include "obstack.h"
-
-extern void free PARAMS ((PTR));
+#include "toplev.h"
/* Obstack allocation and deallocation routines. */
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
-extern char * xmalloc ();
-
/* The default number of entries to use when creating a hash table. */
-#define DEFAULT_SIZE (1009)
-
-#ifndef NULL
-#define NULL 0
-#endif
+#define DEFAULT_SIZE 1009
/* Create a new hash table, given a number of entries. */
-boolean
-hash_table_init_n (table, newfunc, size)
+void
+hash_table_init_n (table, newfunc, hash, comp, size)
struct hash_table *table;
struct hash_entry *(*newfunc) PARAMS ((struct hash_entry *,
- struct hash_table *,
- const char *));
+ struct hash_table *,
+ hash_table_key));
+ unsigned long (*hash) PARAMS ((hash_table_key));
+ bool (*comp) PARAMS ((hash_table_key, hash_table_key));
unsigned int size;
{
unsigned int alloc;
alloc = size * sizeof (struct hash_entry *);
- if (!obstack_begin (&table->memory, alloc))
- {
- error ("no memory");
- return false;
- }
+ obstack_begin (&table->memory, alloc);
table->table = ((struct hash_entry **)
obstack_alloc (&table->memory, alloc));
- if (!table->table)
- {
- error ("no memory");
- return false;
- }
memset ((PTR) table->table, 0, alloc);
table->size = size;
table->newfunc = newfunc;
- return true;
+ table->hash = hash;
+ table->comp = comp;
}
/* Create a new hash table with the default number of entries. */
-boolean
-hash_table_init (table, newfunc)
+void
+hash_table_init (table, newfunc, hash, comp)
struct hash_table *table;
struct hash_entry *(*newfunc) PARAMS ((struct hash_entry *,
- struct hash_table *,
- const char *));
+ struct hash_table *,
+ hash_table_key));
+ unsigned long (*hash) PARAMS ((hash_table_key));
+ bool (*comp) PARAMS ((hash_table_key, hash_table_key));
{
- return hash_table_init_n (table, newfunc, DEFAULT_SIZE);
+ hash_table_init_n (table, newfunc, hash, comp, DEFAULT_SIZE);
}
/* Free a hash table. */
obstack_free (&table->memory, (PTR) NULL);
}
-/* Look up a string in a hash table. */
+/* Look up KEY in TABLE. If CREATE is non-NULL a new entry is
+ created if one does not previously exist. */
struct hash_entry *
-hash_lookup (table, string, create, copy)
+hash_lookup (table, key, create, copy)
struct hash_table *table;
- const char *string;
- boolean create;
- boolean copy;
+ hash_table_key key;
+ int create;
+ hash_table_key (*copy) PARAMS ((struct obstack* memory,
+ hash_table_key key));
{
- register const unsigned char *s;
- register unsigned long hash;
- register unsigned int c;
+ unsigned long hash;
struct hash_entry *hashp;
- unsigned int len;
unsigned int index;
- hash = 0;
- len = 0;
- s = (const unsigned char *) string;
- while ((c = *s++) != '\0')
- {
- hash += c + (c << 17);
- hash ^= hash >> 2;
- ++len;
- }
- hash += len + (len << 17);
- hash ^= hash >> 2;
+ hash = (*table->hash)(key);
index = hash % table->size;
- for (hashp = table->table[index];
- hashp != (struct hash_entry *) NULL;
- hashp = hashp->next)
- {
- if (hashp->hash == hash
- && strcmp (hashp->string, string) == 0)
- return hashp;
- }
+ for (hashp = table->table[index]; hashp != 0; hashp = hashp->next)
+ if (hashp->hash == hash
+ && (*table->comp)(hashp->key, key))
+ return hashp;
if (! create)
- return (struct hash_entry *) NULL;
+ return 0;
+
+ hashp = (*table->newfunc) ((struct hash_entry *) NULL, table, key);
+ if (hashp == 0)
+ return 0;
- hashp = (*table->newfunc) ((struct hash_entry *) NULL, table, string);
- if (hashp == (struct hash_entry *) NULL)
- return (struct hash_entry *) NULL;
if (copy)
- {
- char *new;
-
- new = (char *) obstack_alloc (&table->memory, len + 1);
- if (!new)
- {
- error ("no memory");
- return (struct hash_entry *) NULL;
- }
- strcpy (new, string);
- string = new;
- }
- hashp->string = string;
+ key = (*copy) (&table->memory, key);
+
+ hashp->key = key;
hashp->hash = hash;
hashp->next = table->table[index];
table->table[index] = hashp;
/* Base method for creating a new hash table entry. */
-/*ARGSUSED*/
struct hash_entry *
-hash_newfunc (entry, table, string)
+hash_newfunc (entry, table, p)
struct hash_entry *entry;
struct hash_table *table;
- const char *string;
+ hash_table_key p ATTRIBUTE_UNUSED;
{
- if (entry == (struct hash_entry *) NULL)
+ if (entry == 0)
entry = ((struct hash_entry *)
hash_allocate (table, sizeof (struct hash_entry)));
return entry;
struct hash_table *table;
unsigned int size;
{
- PTR ret;
-
- ret = obstack_alloc (&table->memory, size);
- if (ret == NULL && size != 0)
- error ("no memory");
- return ret;
+ return obstack_alloc (&table->memory, size);
}
/* Traverse a hash table. */
void
hash_traverse (table, func, info)
struct hash_table *table;
- boolean (*func) PARAMS ((struct hash_entry *, PTR));
+ bool (*func) PARAMS ((struct hash_entry *, hash_table_key));
PTR info;
{
unsigned int i;
+ struct hash_entry *p;
for (i = 0; i < table->size; i++)
- {
- struct hash_entry *p;
+ for (p = table->table[i]; p != 0; p = p->next)
+ if (! (*func) (p, info))
+ return;
+}
+
+/* Hash a string. Return a hash-code for the string. */
+
+unsigned long
+string_hash (k)
+ hash_table_key k;
+{
+ const unsigned char *s;
+ unsigned long hash;
+ unsigned char c;
+ unsigned int len;
+
+ s = (const unsigned char *) k;
+ hash = 0;
+ len = 0;
- for (p = table->table[i]; p != NULL; p = p->next)
- {
- if (! (*func) (p, info))
- return;
- }
+ while ((c = *s++) != '\0')
+ {
+ hash += c + (c << 17);
+ hash ^= hash >> 2;
+ ++len;
}
+
+ hash += len + (len << 17);
+ hash ^= hash >> 2;
+
+ return hash;
+}
+
+/* Compare two strings. Return non-zero iff the two strings are
+ the same. */
+
+bool
+string_compare (k1, k2)
+ hash_table_key k1;
+ hash_table_key k2;
+{
+ return (strcmp ((char*) k1, (char*) k2) == 0);
+}
+
+/* Copy K to OBSTACK. */
+
+hash_table_key
+string_copy (memory, k)
+ struct obstack *memory;
+ hash_table_key k;
+{
+ char *new;
+ char *string = (char *) k;
+
+ new = (char *) obstack_alloc (memory, strlen (string) + 1);
+ strcpy (new, string);
+
+ return new;
}
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