The refs code has two global maps that track the submodule and worktree
ref stores. Even though both of these maps track values by strings, we
still use a `struct hashmap` instead of a `struct strmap`. This has the
benefit of saving us an allocation because we can combine key and value
in a single struct. But it does introduce significant complexity that is
completely unneeded.
Refactor the code to use `struct strmap`s instead to reduce complexity.
It's unlikely that this will have any real-world impact on performance
given that most repositories likely won't have all that many ref stores.
Furthermore, this refactoring allows us to de-globalize those maps and
move them into `struct repository` in a subsequent commit more easily.
Signed-off-by: Patrick Steinhardt <ps@xxxxxx>
---
refs.c | 71 ++++++++++++----------------------------------------------
1 file changed, 14 insertions(+), 57 deletions(-)
diff --git a/refs.c b/refs.c
index edb0a633d1..542acb25ff 100644
--- a/refs.c
+++ b/refs.c
@@ -6,7 +6,7 @@
#include "advice.h"
#include "config.h"
#include "environment.h"
-#include "hashmap.h"
+#include "strmap.h"
#include "gettext.h"
#include "hex.h"
#include "lockfile.h"
@@ -1960,66 +1960,27 @@ int resolve_gitlink_ref(const char *submodule, const char *refname,
return 0;
}
-struct ref_store_hash_entry
-{
- struct hashmap_entry ent;
-
- struct ref_store *refs;
-
- /* NUL-terminated identifier of the ref store: */
- char name[FLEX_ARRAY];
-};
+/* A strmap of ref_stores, stored by submodule name: */
+static struct strmap submodule_ref_stores;
-static int ref_store_hash_cmp(const void *cmp_data UNUSED,
- const struct hashmap_entry *eptr,
- const struct hashmap_entry *entry_or_key,
- const void *keydata)
-{
- const struct ref_store_hash_entry *e1, *e2;
- const char *name;
-
- e1 = container_of(eptr, const struct ref_store_hash_entry, ent);
- e2 = container_of(entry_or_key, const struct ref_store_hash_entry, ent);
- name = keydata ? keydata : e2->name;
-
- return strcmp(e1->name, name);
-}
-
-static struct ref_store_hash_entry *alloc_ref_store_hash_entry(
- const char *name, struct ref_store *refs)
-{
- struct ref_store_hash_entry *entry;
-
- FLEX_ALLOC_STR(entry, name, name);
- hashmap_entry_init(&entry->ent, strhash(name));
- entry->refs = refs;
- return entry;
-}
-
-/* A hashmap of ref_stores, stored by submodule name: */
-static struct hashmap submodule_ref_stores;
-
-/* A hashmap of ref_stores, stored by worktree id: */
-static struct hashmap worktree_ref_stores;
+/* A strmap of ref_stores, stored by worktree id: */
+static struct strmap worktree_ref_stores;
/*
* Look up a ref store by name. If that ref_store hasn't been
* registered yet, return NULL.
*/
-static struct ref_store *lookup_ref_store_map(struct hashmap *map,
+static struct ref_store *lookup_ref_store_map(struct strmap *map,
const char *name)
{
- struct ref_store_hash_entry *entry;
- unsigned int hash;
+ struct strmap_entry *entry;
- if (!map->tablesize)
+ if (!map->map.tablesize)
/* It's initialized on demand in register_ref_store(). */
return NULL;
- hash = strhash(name);
- entry = hashmap_get_entry_from_hash(map, hash, name,
- struct ref_store_hash_entry, ent);
- return entry ? entry->refs : NULL;
+ entry = strmap_get_entry(map, name);
+ return entry ? entry->value : NULL;
}
/*
@@ -2064,18 +2025,14 @@ struct ref_store *get_main_ref_store(struct repository *r)
* Associate a ref store with a name. It is a fatal error to call this
* function twice for the same name.
*/
-static void register_ref_store_map(struct hashmap *map,
+static void register_ref_store_map(struct strmap *map,
const char *type,
struct ref_store *refs,
const char *name)
{
- struct ref_store_hash_entry *entry;
-
- if (!map->tablesize)
- hashmap_init(map, ref_store_hash_cmp, NULL, 0);
-
- entry = alloc_ref_store_hash_entry(name, refs);
- if (hashmap_put(map, &entry->ent))
+ if (!map->map.tablesize)
+ strmap_init(map);
+ if (strmap_put(map, name, refs))
BUG("%s ref_store '%s' initialized twice", type, name);
}
--
2.45.1.190.g19fe900cfc.dirty
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