diff options
Diffstat (limited to 'libiberty')
| -rw-r--r-- | libiberty/ChangeLog | 12 | ||||
| -rw-r--r-- | libiberty/hashtab.c | 120 |
2 files changed, 83 insertions, 49 deletions
diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog index 2dce4d8..661ca4b 100644 --- a/libiberty/ChangeLog +++ b/libiberty/ChangeLog @@ -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 diff --git a/libiberty/hashtab.c b/libiberty/hashtab.c index 231fbc0..f775166 100644 --- a/libiberty/hashtab.c +++ b/libiberty/hashtab.c @@ -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. */ |