repository: introduce parsed objects field

Convert the existing global cache for parsed objects (obj_hash) into
repository-specific parsed object caches. Existing code that uses
obj_hash are modified to use the parsed object cache of
the_repository; future patches will use the parsed object caches of
other repositories.

Another future use case for a pool of objects is ease of memory management
in revision walking: If we can free the rev-list related memory early in
pack-objects (e.g. part of repack operation) then it could lower memory
pressure significantly when running on large repos. While this has been
discussed on the mailing list lately, this series doesn't implement this.

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/repository.c b/repository.c
index a4848c1bd0..c23404677e 100644
--- a/repository.c
+++ b/repository.c
@@ -2,6 +2,7 @@
 #include "repository.h"
 #include "object-store.h"
 #include "config.h"
+#include "object.h"
 #include "submodule-config.h"
 
 /* The main repository */
@@ -14,6 +15,8 @@ void initialize_the_repository(void)
 
 	the_repo.index = &the_index;
 	the_repo.objects = raw_object_store_new();
+	the_repo.parsed_objects = parsed_object_pool_new();
+
 	repo_set_hash_algo(&the_repo, GIT_HASH_SHA1);
 }
 
@@ -143,6 +146,7 @@ static int repo_init(struct repository *repo,
 	memset(repo, 0, sizeof(*repo));
 
 	repo->objects = raw_object_store_new();
+	repo->parsed_objects = parsed_object_pool_new();
 
 	if (repo_init_gitdir(repo, gitdir))
 		goto error;
@@ -226,6 +230,9 @@ void repo_clear(struct repository *repo)
 	raw_object_store_clear(repo->objects);
 	FREE_AND_NULL(repo->objects);
 
+	parsed_object_pool_clear(repo->parsed_objects);
+	FREE_AND_NULL(repo->parsed_objects);
+
 	if (repo->config) {
 		git_configset_clear(repo->config);
 		FREE_AND_NULL(repo->config);