Johannes Schindelin <Johannes.Schindelin@xxxxxx> writes:
> Just one thing^W^Wa couple of things:
>
> It would probably make more sense to `hashmap_get_from_hash()` and
> `strhash()` here (and `strhash()` should probably be used everywhere
> instead of `memhash(str, strlen(str))`).
hashmap_get_from_hash() certainly is much better suited for simpler
usage pattern like these callsites, and the ones in sequencer.c. It
is a shame that a more complex variant takes the shorter-and-sweeter
name hashmap_get().
I wish we named the latter hashmap_get_fullblown_feature_rich() and
called the _from_hash() thing a simple hashmap_get() from day one,
but it is way too late.
I looked briefly the users of the _get() variant, and some of their
uses are legitimately not-simple and cannot be reduced to use the
simpler _get_from_hash variant, it seems. But others like those in
builtin/difftool.c should be straight-forward to convert to use the
simpler get_from_hash variant. It could be a low-hanging fruit left
for later clean-up, perhaps.
>> @@ -271,10 +319,10 @@ static void find_non_local_tags(const struct ref *refs,
>> !has_object_file_with_flags(&ref->old_oid,
>> OBJECT_INFO_QUICK) &&
>> !will_fetch(head, ref->old_oid.hash) &&
>> - !has_sha1_file_with_flags(item->util,
>> + !has_sha1_file_with_flags(item->oid.hash,
>
> I am not sure that we need to test for null OIDs here, given that...
> ...
> Of course, `has_sha1_file_with_flags()` is supposed to return `false` for
> null OIDs, I guess.
Yup. An alternative is to make item->oid a pointer to oid, not an
oid object itself, so that we can express "no OID for this ref" in a
more explicit way, but is_null_oid() is already used as "no OID" in
many other codepaths, so...
>> + for_each_string_list_item(remote_ref_item, &remote_refs_list) {
>> + const char *refname = remote_ref_item->string;
>> + struct hashmap_entry key;
>> +
>> + hashmap_entry_init(&key, memhash(refname, strlen(refname)));
>> + item = hashmap_get(&remote_refs, &key, refname);
>> + if (!item)
>> + continue; /* can this happen??? */
>
> This would indicate a BUG, no?
Possibly. Alternatively, we can just use item without checking and
let the runtime segfault.
Here is an incremental on top that can be squashed in to turn v3
into v4.
diff --git a/builtin/fetch.c b/builtin/fetch.c
index 0f8e333022..aee1d9bf21 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -259,7 +259,7 @@ static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
size_t len = strlen(refname);
FLEX_ALLOC_MEM(ent, refname, refname, len);
- hashmap_entry_init(ent, memhash(refname, len));
+ hashmap_entry_init(ent, strhash(refname));
oidcpy(&ent->oid, oid);
hashmap_add(map, ent);
return ent;
@@ -282,11 +282,7 @@ static void refname_hash_init(struct hashmap *map)
static int refname_hash_exists(struct hashmap *map, const char *refname)
{
- struct hashmap_entry key;
- size_t len = strlen(refname);
- hashmap_entry_init(&key, memhash(refname, len));
-
- return !!hashmap_get(map, &key, refname);
+ return !!hashmap_get_from_hash(map, strhash(refname), refname);
}
static void find_non_local_tags(const struct ref *refs,
@@ -365,12 +361,10 @@ static void find_non_local_tags(const struct ref *refs,
*/
for_each_string_list_item(remote_ref_item, &remote_refs_list) {
const char *refname = remote_ref_item->string;
- struct hashmap_entry key;
- hashmap_entry_init(&key, memhash(refname, strlen(refname)));
- item = hashmap_get(&remote_refs, &key, refname);
+ item = hashmap_get_from_hash(&remote_refs, strhash(refname), refname);
if (!item)
- continue; /* can this happen??? */
+ BUG("unseen remote ref?");
/* Unless we have already decided to ignore this item... */
if (!is_null_oid(&item->oid)) {
@@ -497,12 +491,12 @@ static struct ref *get_ref_map(struct remote *remote,
for (rm = ref_map; rm; rm = rm->next) {
if (rm->peer_ref) {
- struct hashmap_entry key;
const char *refname = rm->peer_ref->name;
struct refname_hash_entry *peer_item;
- hashmap_entry_init(&key, memhash(refname, strlen(refname)));
- peer_item = hashmap_get(&existing_refs, &key, refname);
+ peer_item = hashmap_get_from_hash(&existing_refs,
+ strhash(refname),
+ refname);
if (peer_item) {
struct object_id *old_oid = &peer_item->oid;
oidcpy(&rm->peer_ref->old_oid, old_oid);
