/* hash.c -- hash table routines for BFD
Copyright 1993, 1994, 1995, 1997, 1999, 2001, 2002, 2003, 2004, 2005,
- 2006, 2007, 2009 Free Software Foundation, Inc.
+ 2006, 2007, 2009, 2010, 2011 Free Software Foundation, Inc.
Written by Steve Chamberlain <sac@cygnus.com>
This file is part of BFD, the Binary File Descriptor library.
{
/* These are primes that are near, but slightly smaller than, a
power of two. */
- static const unsigned long primes[] = {
- (unsigned long) 127,
- (unsigned long) 2039,
- (unsigned long) 32749,
- (unsigned long) 65521,
- (unsigned long) 131071,
- (unsigned long) 262139,
- (unsigned long) 524287,
- (unsigned long) 1048573,
- (unsigned long) 2097143,
- (unsigned long) 4194301,
- (unsigned long) 8388593,
- (unsigned long) 16777213,
- (unsigned long) 33554393,
- (unsigned long) 67108859,
- (unsigned long) 134217689,
- (unsigned long) 268435399,
- (unsigned long) 536870909,
- (unsigned long) 1073741789,
- (unsigned long) 2147483647,
+ static const unsigned long primes[] =
+ {
+ (unsigned long) 31,
+ (unsigned long) 61,
+ (unsigned long) 127,
+ (unsigned long) 251,
+ (unsigned long) 509,
+ (unsigned long) 1021,
+ (unsigned long) 2039,
+ (unsigned long) 4093,
+ (unsigned long) 8191,
+ (unsigned long) 16381,
+ (unsigned long) 32749,
+ (unsigned long) 65521,
+ (unsigned long) 131071,
+ (unsigned long) 262139,
+ (unsigned long) 524287,
+ (unsigned long) 1048573,
+ (unsigned long) 2097143,
+ (unsigned long) 4194301,
+ (unsigned long) 8388593,
+ (unsigned long) 16777213,
+ (unsigned long) 33554393,
+ (unsigned long) 67108859,
+ (unsigned long) 134217689,
+ (unsigned long) 268435399,
+ (unsigned long) 536870909,
+ (unsigned long) 1073741789,
+ (unsigned long) 2147483647,
/* 4294967291L */
- ((unsigned long) 2147483647) + ((unsigned long) 2147483644),
+ ((unsigned long) 2147483647) + ((unsigned long) 2147483644),
};
const unsigned long *low = &primes[0];
return *low;
}
-static size_t bfd_default_hash_table_size = DEFAULT_SIZE;
+static unsigned long bfd_default_hash_table_size = DEFAULT_SIZE;
/* Create a new hash table, given a number of entries. */
unsigned int entsize,
unsigned int size)
{
- unsigned int alloc;
+ unsigned long alloc;
- alloc = size * sizeof (struct bfd_hash_entry *);
+ alloc = size;
+ alloc *= sizeof (struct bfd_hash_entry *);
+ if (alloc / sizeof (struct bfd_hash_entry *) != size)
+ {
+ bfd_set_error (bfd_error_no_memory);
+ return FALSE;
+ }
table->memory = (void *) objalloc_create ();
if (table->memory == NULL)
table->memory = NULL;
}
-/* Look up a string in a hash table. */
-
-struct bfd_hash_entry *
-bfd_hash_lookup (struct bfd_hash_table *table,
- const char *string,
- bfd_boolean create,
- bfd_boolean copy)
+static inline unsigned long
+bfd_hash_hash (const char *string, unsigned int *lenp)
{
const unsigned char *s;
unsigned long hash;
- unsigned int c;
- struct bfd_hash_entry *hashp;
unsigned int len;
- unsigned int index;
+ unsigned int c;
hash = 0;
len = 0;
len = (s - (const unsigned char *) string) - 1;
hash += len + (len << 17);
hash ^= hash >> 2;
+ if (lenp != NULL)
+ *lenp = len;
+ return hash;
+}
+
+/* Look up a string in a hash table. */
+
+struct bfd_hash_entry *
+bfd_hash_lookup (struct bfd_hash_table *table,
+ const char *string,
+ bfd_boolean create,
+ bfd_boolean copy)
+{
+ unsigned long hash;
+ struct bfd_hash_entry *hashp;
+ unsigned int len;
+ unsigned int _index;
- index = hash % table->size;
- for (hashp = table->table[index];
+ hash = bfd_hash_hash (string, &len);
+ _index = hash % table->size;
+ for (hashp = table->table[_index];
hashp != NULL;
hashp = hashp->next)
{
unsigned long hash)
{
struct bfd_hash_entry *hashp;
- unsigned int index;
+ unsigned int _index;
hashp = (*table->newfunc) (NULL, table, string);
if (hashp == NULL)
return NULL;
hashp->string = string;
hashp->hash = hash;
- index = hash % table->size;
- hashp->next = table->table[index];
- table->table[index] = hashp;
+ _index = hash % table->size;
+ hashp->next = table->table[_index];
+ table->table[_index] = hashp;
table->count++;
if (!table->frozen && table->count > table->size * 3 / 4)
chain_end = chain_end->next;
table->table[hi] = chain_end->next;
- index = chain->hash % newsize;
- chain_end->next = newtable[index];
- newtable[index] = chain;
+ _index = chain->hash % newsize;
+ chain_end->next = newtable[_index];
+ newtable[_index] = chain;
}
table->table = newtable;
table->size = newsize;
return hashp;
}
+/* Rename an entry in a hash table. */
+
+void
+bfd_hash_rename (struct bfd_hash_table *table,
+ const char *string,
+ struct bfd_hash_entry *ent)
+{
+ unsigned int _index;
+ struct bfd_hash_entry **pph;
+
+ _index = ent->hash % table->size;
+ for (pph = &table->table[_index]; *pph != NULL; pph = &(*pph)->next)
+ if (*pph == ent)
+ break;
+ if (*pph == NULL)
+ abort ();
+
+ *pph = ent->next;
+ ent->string = string;
+ ent->hash = bfd_hash_hash (string, NULL);
+ _index = ent->hash % table->size;
+ ent->next = table->table[_index];
+ table->table[_index] = ent;
+}
+
/* Replace an entry in a hash table. */
void
struct bfd_hash_entry *old,
struct bfd_hash_entry *nw)
{
- unsigned int index;
+ unsigned int _index;
struct bfd_hash_entry **pph;
- index = old->hash % table->size;
- for (pph = &table->table[index];
+ _index = old->hash % table->size;
+ for (pph = &table->table[_index];
(*pph) != NULL;
pph = &(*pph)->next)
{
table->frozen = 0;
}
\f
-void
-bfd_hash_set_default_size (bfd_size_type hash_size)
+unsigned long
+bfd_hash_set_default_size (unsigned long hash_size)
{
/* Extend this prime list if you want more granularity of hash table size. */
- static const bfd_size_type hash_size_primes[] =
+ static const unsigned long hash_size_primes[] =
{
- 251, 509, 1021, 2039, 4051, 8599, 16699, 32749
+ 31, 61, 127, 251, 509, 1021, 2039, 4091, 8191, 16381, 32749, 65537
};
- size_t index;
+ unsigned int _index;
/* Work out best prime number near the hash_size. */
- for (index = 0; index < ARRAY_SIZE (hash_size_primes) - 1; ++index)
- if (hash_size <= hash_size_primes[index])
+ for (_index = 0; _index < ARRAY_SIZE (hash_size_primes) - 1; ++_index)
+ if (hash_size <= hash_size_primes[_index])
break;
- bfd_default_hash_table_size = hash_size_primes[index];
+ bfd_default_hash_table_size = hash_size_primes[_index];
+ return bfd_default_hash_table_size;
}
\f
/* A few different object file formats (a.out, COFF, ELF) use a string