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merge from gcc

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DJ Delorie 2004-04-01 02:00:55 +00:00
parent f0aaee4940
commit fe046a1715
2 changed files with 83 additions and 49 deletions
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12
libiberty/ChangeLog
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@ -1,3 +1,15 @@
2004-03-31 Richard Henderson <rth@redhat.com>
* hashtab.c (htab_size): Move to top of file; mark inline.
(htab_elements): Likewise.
(htab_mod, htab_mod_m2): New.
(htab_delete): Refactor htab->size and htab->entries.
(htab_empty): Likewise.
(find_empty_slot_for_expand): Use htab_size, htab_mod, htab_mod_m2.
(htab_find_with_hash, htab_find_slot_with_hash): Likewise.
(htab_clear_slot): Use htab_size, htab_elements.
(htab_traverse_noresize, htab_traverse): Likewise.
2004-03-17 Ian Lance Taylor <ian@wasabisystems.com>
* pex-unix.c (pexecute): Use vfork instead of fork, with

120
libiberty/hashtab.c
View File

@ -159,6 +159,44 @@ eq_pointer (p1, p2)
return p1 == p2;
}
/* Return the current size of given hash table. */
inline size_t
htab_size (htab)
htab_t htab;
{
return htab->size;
}
/* Return the current number of elements in given hash table. */
inline size_t
htab_elements (htab)
htab_t htab;
{
return htab->n_elements - htab->n_deleted;
}
/* Compute the primary hash for HASH given HTAB's current size. */
static inline hashval_t
htab_mod (hash, htab)
hashval_t hash;
htab_t htab;
{
return hash % htab_size (htab);
}
/* Compute the secondary hash for HASH given HTAB's current size. */
static inline hashval_t
htab_mod_m2 (hash, htab)
hashval_t hash;
htab_t htab;
{
return 1 + hash % (htab_size (htab) - 2);
}
/* This function creates table with length slightly longer than given
source length. Created hash table is initiated as empty (all the
hash table entries are EMPTY_ENTRY). The function returns the
@ -282,22 +320,23 @@ void
htab_delete (htab)
htab_t htab;
{
size_t size = htab_size (htab);
PTR *entries = htab->entries;
int i;
if (htab->del_f)
for (i = htab->size - 1; i >= 0; i--)
if (htab->entries[i] != EMPTY_ENTRY
&& htab->entries[i] != DELETED_ENTRY)
(*htab->del_f) (htab->entries[i]);
for (i = size - 1; i >= 0; i--)
if (entries[i] != EMPTY_ENTRY && entries[i] != DELETED_ENTRY)
(*htab->del_f) (entries[i]);
if (htab->free_f != NULL)
{
(*htab->free_f) (htab->entries);
(*htab->free_f) (entries);
(*htab->free_f) (htab);
}
else if (htab->free_with_arg_f != NULL)
{
(*htab->free_with_arg_f) (htab->alloc_arg, htab->entries);
(*htab->free_with_arg_f) (htab->alloc_arg, entries);
(*htab->free_with_arg_f) (htab->alloc_arg, htab);
}
}
@ -308,15 +347,16 @@ void
htab_empty (htab)
htab_t htab;
{
size_t size = htab_size (htab);
PTR *entries = htab->entries;
int i;
if (htab->del_f)
for (i = htab->size - 1; i >= 0; i--)
if (htab->entries[i] != EMPTY_ENTRY
&& htab->entries[i] != DELETED_ENTRY)
(*htab->del_f) (htab->entries[i]);
for (i = size - 1; i >= 0; i--)
if (entries[i] != EMPTY_ENTRY && entries[i] != DELETED_ENTRY)
(*htab->del_f) (entries[i]);
memset (htab->entries, 0, htab->size * sizeof (PTR));
memset (entries, 0, size * sizeof (PTR));
}
/* Similar to htab_find_slot, but without several unwanted side effects:
@ -331,8 +371,8 @@ find_empty_slot_for_expand (htab, hash)
htab_t htab;
hashval_t hash;
{
size_t size = htab->size;
unsigned int index = hash % size;
hashval_t index = htab_mod (hash, htab);
size_t size = htab_size (htab);
PTR *slot = htab->entries + index;
hashval_t hash2;
@ -341,7 +381,7 @@ find_empty_slot_for_expand (htab, hash)
else if (*slot == DELETED_ENTRY)
abort ();
hash2 = 1 + hash % (size - 2);
hash2 = htab_mod_m2 (hash, htab);
for (;;)
{
index += hash2;
@ -431,22 +471,20 @@ htab_find_with_hash (htab, element, hash)
const PTR element;
hashval_t hash;
{
unsigned int index;
hashval_t hash2;
hashval_t index, hash2;
size_t size;
PTR entry;
htab->searches++;
size = htab->size;
index = hash % size;
size = htab_size (htab);
index = htab_mod (hash, htab);
entry = htab->entries[index];
if (entry == EMPTY_ENTRY
|| (entry != DELETED_ENTRY && (*htab->eq_f) (entry, element)))
return entry;
hash2 = 1 + hash % (size - 2);
hash2 = htab_mod_m2 (hash, htab);
for (;;)
{
htab->collisions++;
@ -488,17 +526,19 @@ htab_find_slot_with_hash (htab, element, hash, insert)
enum insert_option insert;
{
PTR *first_deleted_slot;
unsigned int index;
hashval_t hash2;
hashval_t index, hash2;
size_t size;
PTR entry;
if (insert == INSERT && htab->size * 3 <= htab->n_elements * 4
&& htab_expand (htab) == 0)
return NULL;
size = htab_size (htab);
if (insert == INSERT && size * 3 <= htab->n_elements * 4)
{
if (htab_expand (htab) == 0)
return NULL;
size = htab_size (htab);
}
size = htab->size;
index = hash % size;
index = htab_mod (hash, htab);
htab->searches++;
first_deleted_slot = NULL;
@ -511,7 +551,7 @@ htab_find_slot_with_hash (htab, element, hash, insert)
else if ((*htab->eq_f) (entry, element))
return &htab->entries[index];
hash2 = 1 + hash % (size - 2);
hash2 = htab_mod_m2 (hash, htab);
for (;;)
{
htab->collisions++;
@ -590,7 +630,7 @@ htab_clear_slot (htab, slot)
htab_t htab;
PTR *slot;
{
if (slot < htab->entries || slot >= htab->entries + htab->size
if (slot < htab->entries || slot >= htab->entries + htab_size (htab)
|| *slot == EMPTY_ENTRY || *slot == DELETED_ENTRY)
abort ();
@ -616,7 +656,7 @@ htab_traverse_noresize (htab, callback, info)
PTR *limit;
slot = htab->entries;
limit = slot + htab->size;
limit = slot + htab_size (htab);
do
{
@ -638,30 +678,12 @@ htab_traverse (htab, callback, info)
htab_trav callback;
PTR info;
{
if ((htab->n_elements - htab->n_deleted) * 8 < htab->size)
if (htab_elements (htab) * 8 < htab_size (htab))
htab_expand (htab);
htab_traverse_noresize (htab, callback, info);
}
/* Return the current size of given hash table. */
size_t
htab_size (htab)
htab_t htab;
{
return htab->size;
}
/* Return the current number of elements in given hash table. */
size_t
htab_elements (htab)
htab_t htab;
{
return htab->n_elements - htab->n_deleted;
}
/* Return the fraction of fixed collisions during all work with given
hash table. */