/* hash.c -- hash table routines for BFD
- Copyright 1993, 1994, 1995, 1997, 1999, 2001, 2002, 2003, 2004, 2005
- Free Software Foundation, Inc.
+ Copyright (C) 1993-2020 Free Software Foundation, Inc.
Written by Steve Chamberlain <sac@cygnus.com>
This file is part of BFD, the Binary File Descriptor library.
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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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. */
+ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
-#include "bfd.h"
#include "sysdep.h"
+#include "bfd.h"
#include "libbfd.h"
#include "objalloc.h"
#include "libiberty.h"
.struct bfd_hash_entry *
.@var{function_name} (struct bfd_hash_entry *entry,
-. struct bfd_hash_table *table,
-. const char *string)
+. struct bfd_hash_table *table,
+. const char *string)
.{
. struct @var{entry_type} *ret = (@var{entry_type} *) entry;
.
. {
. ret = bfd_hash_allocate (table, sizeof (* ret));
. if (ret == NULL)
-. return NULL;
+. return NULL;
. }
.
. {* Call the allocation method of the base class. *}
. ret = ((@var{entry_type} *)
-. @var{base_newfunc} ((struct bfd_hash_entry *) ret, table, string));
+. @var{base_newfunc} ((struct bfd_hash_entry *) ret, table, string));
.
. {* Initialize the local fields here. *}
.
/* The default number of entries to use when creating a hash table. */
#define DEFAULT_SIZE 4051
-static size_t bfd_default_hash_table_size = DEFAULT_SIZE;
+
+/* The following function returns a nearest prime number which is
+ greater than N, and near a power of two. Copied from libiberty.
+ Returns zero for ridiculously large N to signify an error. */
+
+static unsigned long
+higher_prime_number (unsigned long n)
+{
+ /* These are primes that are near, but slightly smaller than, a
+ power of two. */
+ 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),
+ };
+
+ const unsigned long *low = &primes[0];
+ const unsigned long *high = &primes[sizeof (primes) / sizeof (primes[0])];
+
+ while (low != high)
+ {
+ const unsigned long *mid = low + (high - low) / 2;
+ if (n >= *mid)
+ low = mid + 1;
+ else
+ high = mid;
+ }
+
+ if (n >= *low)
+ return 0;
+
+ return *low;
+}
+
+static unsigned long bfd_default_hash_table_size = DEFAULT_SIZE;
/* Create a new hash table, given a number of entries. */
struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
struct bfd_hash_table *,
const char *),
+ 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)
bfd_set_error (bfd_error_no_memory);
return FALSE;
}
- table->table = objalloc_alloc ((struct objalloc *) table->memory, alloc);
+ table->table = (struct bfd_hash_entry **)
+ objalloc_alloc ((struct objalloc *) table->memory, alloc);
if (table->table == NULL)
{
+ bfd_hash_table_free (table);
bfd_set_error (bfd_error_no_memory);
return FALSE;
}
memset ((void *) table->table, 0, alloc);
table->size = size;
+ table->entsize = entsize;
+ table->count = 0;
+ table->frozen = 0;
table->newfunc = newfunc;
return TRUE;
}
bfd_hash_table_init (struct bfd_hash_table *table,
struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
struct bfd_hash_table *,
- const char *))
+ const char *),
+ unsigned int entsize)
{
- return bfd_hash_table_init_n (table, newfunc, bfd_default_hash_table_size);
+ return bfd_hash_table_init_n (table, newfunc, entsize,
+ bfd_default_hash_table_size);
}
/* Free a hash table. */
void
bfd_hash_table_free (struct bfd_hash_table *table)
{
- objalloc_free (table->memory);
+ objalloc_free ((struct objalloc *) table->memory);
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;
+ BFD_ASSERT (string != NULL);
hash = 0;
len = 0;
s = (const unsigned char *) string;
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)
{
if (! create)
return NULL;
- hashp = (*table->newfunc) (NULL, table, string);
- if (hashp == NULL)
- return NULL;
if (copy)
{
- char *new;
+ char *new_string;
- new = objalloc_alloc ((struct objalloc *) table->memory, len + 1);
- if (!new)
+ new_string = (char *) objalloc_alloc ((struct objalloc *) table->memory,
+ len + 1);
+ if (!new_string)
{
bfd_set_error (bfd_error_no_memory);
return NULL;
}
- memcpy (new, string, len + 1);
- string = new;
+ memcpy (new_string, string, len + 1);
+ string = new_string;
}
+
+ return bfd_hash_insert (table, string, hash);
+}
+
+/* Insert an entry in a hash table. */
+
+struct bfd_hash_entry *
+bfd_hash_insert (struct bfd_hash_table *table,
+ const char *string,
+ unsigned long hash)
+{
+ struct bfd_hash_entry *hashp;
+ unsigned int _index;
+
+ hashp = (*table->newfunc) (NULL, table, string);
+ if (hashp == NULL)
+ return NULL;
hashp->string = string;
hashp->hash = hash;
- 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)
+ {
+ unsigned long newsize = higher_prime_number (table->size);
+ struct bfd_hash_entry **newtable;
+ unsigned int hi;
+ unsigned long alloc = newsize * sizeof (struct bfd_hash_entry *);
+
+ /* If we can't find a higher prime, or we can't possibly alloc
+ that much memory, don't try to grow the table. */
+ if (newsize == 0 || alloc / sizeof (struct bfd_hash_entry *) != newsize)
+ {
+ table->frozen = 1;
+ return hashp;
+ }
+
+ newtable = ((struct bfd_hash_entry **)
+ objalloc_alloc ((struct objalloc *) table->memory, alloc));
+ if (newtable == NULL)
+ {
+ table->frozen = 1;
+ return hashp;
+ }
+ memset (newtable, 0, alloc);
+
+ for (hi = 0; hi < table->size; hi ++)
+ while (table->table[hi])
+ {
+ struct bfd_hash_entry *chain = table->table[hi];
+ struct bfd_hash_entry *chain_end = chain;
+
+ while (chain_end->next && chain_end->next->hash == chain->hash)
+ chain_end = chain_end->next;
+
+ table->table[hi] = chain_end->next;
+ _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)
{
const char *string ATTRIBUTE_UNUSED)
{
if (entry == NULL)
- entry = bfd_hash_allocate (table, sizeof (* entry));
+ entry = (struct bfd_hash_entry *) bfd_hash_allocate (table,
+ sizeof (* entry));
return entry;
}
{
unsigned int i;
+ table->frozen = 1;
for (i = 0; i < table->size; i++)
{
struct bfd_hash_entry *p;
for (p = table->table[i]; p != NULL; p = p->next)
if (! (*func) (p, info))
- return;
+ goto out;
}
+ out:
+ 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[] =
{
- 1021, 4051, 8599, 16699
+ 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
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (ret == NULL)
- ret = bfd_hash_allocate (table, sizeof (* entry));
+ ret = (struct strtab_hash_entry *) bfd_hash_allocate (table,
+ sizeof (* ret));
if (ret == NULL)
return NULL;
_bfd_stringtab_init (void)
{
struct bfd_strtab_hash *table;
- bfd_size_type amt = sizeof (* table);
+ size_t amt = sizeof (* table);
- table = bfd_malloc (amt);
+ table = (struct bfd_strtab_hash *) bfd_malloc (amt);
if (table == NULL)
return NULL;
- if (! bfd_hash_table_init (& table->table, strtab_hash_newfunc))
+ if (!bfd_hash_table_init (&table->table, strtab_hash_newfunc,
+ sizeof (struct strtab_hash_entry)))
{
free (table);
return NULL;
/* Get the index of a string in a strtab, adding it if it is not
already present. If HASH is FALSE, we don't really use the hash
- table, and we don't eliminate duplicate strings. */
+ table, and we don't eliminate duplicate strings. If COPY is true
+ then store a copy of STR if creating a new entry. */
bfd_size_type
_bfd_stringtab_add (struct bfd_strtab_hash *tab,
}
else
{
- entry = bfd_hash_allocate (&tab->table, sizeof (* entry));
+ entry = (struct strtab_hash_entry *) bfd_hash_allocate (&tab->table,
+ sizeof (* entry));
if (entry == NULL)
return (bfd_size_type) -1;
if (! copy)
entry->root.string = str;
else
{
+ size_t len = strlen (str) + 1;
char *n;
- n = bfd_hash_allocate (&tab->table, strlen (str) + 1);
+ n = (char *) bfd_hash_allocate (&tab->table, len);
if (n == NULL)
return (bfd_size_type) -1;
+ memcpy (n, str, len);
entry->root.string = n;
}
entry->index = (bfd_size_type) -1;
projects / thirdparty / binutils-gdb.git / blobdiff