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cc00e5ce6b
The comparison functions used for hashmaps don't care about strict ordering; they only want to compare entries for equality. Let's use the oideq() function instead, which can potentially be better optimized. Note that unlike the previous patches mass-converting calls like "!oidcmp()", this patch could actually provide an improvement even with the current implementation. Those comparison functions are passed around as function pointers, so at compile-time the compiler cannot realize that the caller (which is in another file completely) will treat the return value as a boolean. Note that this does change the return values in quite a subtle way (it's still an int, but now the sign bit is irrelevant for ordering). Because of their funny hashmap-specific signature, it's unlikely that any of these static functions would be reused for more generic ordering. But to be double-sure, let's stop using "cmp" in their names. Calling them "eq" doesn't quite work either, because the hashmap convention is actually _inverted_. "0" means "same", and non-zero means "different". So I've called them "neq" by convention here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
#include "cache.h"
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#include "oidmap.h"
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static int oidmap_neq(const void *hashmap_cmp_fn_data,
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const void *entry, const void *entry_or_key,
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const void *keydata)
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{
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const struct oidmap_entry *entry_ = entry;
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if (keydata)
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return !oideq(&entry_->oid, (const struct object_id *) keydata);
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return !oideq(&entry_->oid,
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&((const struct oidmap_entry *) entry_or_key)->oid);
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}
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static int hash(const struct object_id *oid)
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{
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int hash;
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memcpy(&hash, oid->hash, sizeof(hash));
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return hash;
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}
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void oidmap_init(struct oidmap *map, size_t initial_size)
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{
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hashmap_init(&map->map, oidmap_neq, NULL, initial_size);
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}
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void oidmap_free(struct oidmap *map, int free_entries)
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{
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if (!map)
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return;
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hashmap_free(&map->map, free_entries);
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}
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void *oidmap_get(const struct oidmap *map, const struct object_id *key)
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{
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if (!map->map.cmpfn)
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return NULL;
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return hashmap_get_from_hash(&map->map, hash(key), key);
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}
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void *oidmap_remove(struct oidmap *map, const struct object_id *key)
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{
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struct hashmap_entry entry;
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if (!map->map.cmpfn)
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oidmap_init(map, 0);
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hashmap_entry_init(&entry, hash(key));
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return hashmap_remove(&map->map, &entry, key);
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}
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void *oidmap_put(struct oidmap *map, void *entry)
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{
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struct oidmap_entry *to_put = entry;
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if (!map->map.cmpfn)
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oidmap_init(map, 0);
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hashmap_entry_init(&to_put->internal_entry, hash(&to_put->oid));
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return hashmap_put(&map->map, to_put);
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}
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