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refs: track ref stores via strmap

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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@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt 2024-05-17 10:18:28 +02:00 committed by Junio C Hamano
parent 71c871b48d
commit f1782d185b
1 changed files with 14 additions and 57 deletions
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71
refs.c
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@ -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;
/* A strmap of ref_stores, stored by submodule name: */
static struct strmap submodule_ref_stores;
struct ref_store *refs;
/* NUL-terminated identifier of the ref store: */
char name[FLEX_ARRAY];
};
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);
}