/* An expandable hash tables datatype.
- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2009
- Free Software Foundation, Inc.
+ Copyright (C) 1999-2021 Free Software Foundation, Inc.
Contributed by Vladimir Makarov (vmakarov@cygnus.com).
This file is part of the libiberty library.
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
+#ifdef HAVE_INTTYPES_H
+#include <inttypes.h>
+#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
return low;
}
-/* Returns a hash code for P. */
-
-static hashval_t
-hash_pointer (const PTR p)
-{
- return (hashval_t) ((long)p >> 3);
-}
-
/* Returns non-zero if P1 and P2 are equal. */
static int
htab_t
htab_create_alloc (size_t size, htab_hash hash_f, htab_eq eq_f,
htab_del del_f, htab_alloc alloc_f, htab_free free_f)
+{
+ return htab_create_typed_alloc (size, hash_f, eq_f, del_f, alloc_f, alloc_f,
+ free_f);
+}
+
+/* As above, but uses the variants of ALLOC_F and FREE_F which accept
+ an extra argument. */
+
+htab_t
+htab_create_alloc_ex (size_t size, htab_hash hash_f, htab_eq eq_f,
+ htab_del del_f, void *alloc_arg,
+ htab_alloc_with_arg alloc_f,
+ htab_free_with_arg free_f)
{
htab_t result;
unsigned int size_prime_index;
size_prime_index = higher_prime_index (size);
size = prime_tab[size_prime_index].prime;
- result = (htab_t) (*alloc_f) (1, sizeof (struct htab));
+ result = (htab_t) (*alloc_f) (alloc_arg, 1, sizeof (struct htab));
if (result == NULL)
return NULL;
- result->entries = (PTR *) (*alloc_f) (size, sizeof (PTR));
+ result->entries = (PTR *) (*alloc_f) (alloc_arg, size, sizeof (PTR));
if (result->entries == NULL)
{
if (free_f != NULL)
- (*free_f) (result);
+ (*free_f) (alloc_arg, result);
return NULL;
}
result->size = size;
result->hash_f = hash_f;
result->eq_f = eq_f;
result->del_f = del_f;
- result->alloc_f = alloc_f;
- result->free_f = free_f;
+ result->alloc_arg = alloc_arg;
+ result->alloc_with_arg_f = alloc_f;
+ result->free_with_arg_f = free_f;
return result;
}
-/* As above, but use the variants of alloc_f and free_f which accept
- an extra argument. */
+/*
+
+@deftypefn Supplemental htab_t htab_create_typed_alloc (size_t @var{size}, @
+htab_hash @var{hash_f}, htab_eq @var{eq_f}, htab_del @var{del_f}, @
+htab_alloc @var{alloc_tab_f}, htab_alloc @var{alloc_f}, @
+htab_free @var{free_f})
+
+This function creates a hash table that uses two different allocators
+@var{alloc_tab_f} and @var{alloc_f} to use for allocating the table itself
+and its entries respectively. This is useful when variables of different
+types need to be allocated with different allocators.
+
+The created hash table is slightly larger than @var{size} and it is
+initially empty (all the hash table entries are @code{HTAB_EMPTY_ENTRY}).
+The function returns the created hash table, or @code{NULL} if memory
+allocation fails.
+
+@end deftypefn
+
+*/
htab_t
-htab_create_alloc_ex (size_t size, htab_hash hash_f, htab_eq eq_f,
- htab_del del_f, void *alloc_arg,
- htab_alloc_with_arg alloc_f,
- htab_free_with_arg free_f)
+htab_create_typed_alloc (size_t size, htab_hash hash_f, htab_eq eq_f,
+ htab_del del_f, htab_alloc alloc_tab_f,
+ htab_alloc alloc_f, htab_free free_f)
{
htab_t result;
unsigned int size_prime_index;
size_prime_index = higher_prime_index (size);
size = prime_tab[size_prime_index].prime;
- result = (htab_t) (*alloc_f) (alloc_arg, 1, sizeof (struct htab));
+ result = (htab_t) (*alloc_tab_f) (1, sizeof (struct htab));
if (result == NULL)
return NULL;
- result->entries = (PTR *) (*alloc_f) (alloc_arg, size, sizeof (PTR));
+ result->entries = (PTR *) (*alloc_f) (size, sizeof (PTR));
if (result->entries == NULL)
{
if (free_f != NULL)
- (*free_f) (alloc_arg, result);
+ (*free_f) (result);
return NULL;
}
result->size = size;
result->hash_f = hash_f;
result->eq_f = eq_f;
result->del_f = del_f;
- result->alloc_arg = alloc_arg;
- result->alloc_with_arg_f = alloc_f;
- result->free_with_arg_f = free_f;
+ result->alloc_f = alloc_f;
+ result->free_f = free_f;
return result;
}
+
/* Update the function pointers and allocation parameter in the htab_t. */
void
element in the hash table, this function does nothing. */
void
-htab_remove_elt (htab_t htab, PTR element)
+htab_remove_elt (htab_t htab, const PTR element)
{
htab_remove_elt_with_hash (htab, element, (*htab->hash_f) (element));
}
function does nothing. */
void
-htab_remove_elt_with_hash (htab_t htab, PTR element, hashval_t hash)
+htab_remove_elt_with_hash (htab_t htab, const PTR element, hashval_t hash)
{
PTR *slot;
slot = htab_find_slot_with_hash (htab, element, hash, NO_INSERT);
- if (*slot == HTAB_EMPTY_ENTRY)
+ if (slot == NULL)
return;
if (htab->del_f)
c += length;
switch(len) /* all the case statements fall through */
{
- case 11: c+=((hashval_t)k[10]<<24);
- case 10: c+=((hashval_t)k[9]<<16);
- case 9 : c+=((hashval_t)k[8]<<8);
+ case 11: c+=((hashval_t)k[10]<<24); /* fall through */
+ case 10: c+=((hashval_t)k[9]<<16); /* fall through */
+ case 9 : c+=((hashval_t)k[8]<<8); /* fall through */
/* the first byte of c is reserved for the length */
- case 8 : b+=((hashval_t)k[7]<<24);
- case 7 : b+=((hashval_t)k[6]<<16);
- case 6 : b+=((hashval_t)k[5]<<8);
- case 5 : b+=k[4];
- case 4 : a+=((hashval_t)k[3]<<24);
- case 3 : a+=((hashval_t)k[2]<<16);
- case 2 : a+=((hashval_t)k[1]<<8);
+ case 8 : b+=((hashval_t)k[7]<<24); /* fall through */
+ case 7 : b+=((hashval_t)k[6]<<16); /* fall through */
+ case 6 : b+=((hashval_t)k[5]<<8); /* fall through */
+ case 5 : b+=k[4]; /* fall through */
+ case 4 : a+=((hashval_t)k[3]<<24); /* fall through */
+ case 3 : a+=((hashval_t)k[2]<<16); /* fall through */
+ case 2 : a+=((hashval_t)k[1]<<8); /* fall through */
case 1 : a+=k[0];
/* case 0: nothing left to add */
}
/*-------------------------------------------- report the result */
return c;
}
+
+/* Returns a hash code for pointer P. Simplified version of evahash */
+
+static hashval_t
+hash_pointer (const PTR p)
+{
+ intptr_t v = (intptr_t) p;
+ unsigned a, b, c;
+
+ a = b = 0x9e3779b9;
+ a += v >> (sizeof (intptr_t) * CHAR_BIT / 2);
+ b += v & (((intptr_t) 1 << (sizeof (intptr_t) * CHAR_BIT / 2)) - 1);
+ c = 0x42135234;
+ mix (a, b, c);
+ return c;
+}
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