commit: prepare free_commit_buffer and release_commit_memory for any repo

Pass the object pool to free_commit_buffer and release_commit_memory,
such that we can eliminate access to 'the_repository'.

Also remove the TODO in release_commit_memory, as commit->util was
removed in 9d2c97016f (commit.h: delete 'util' field in struct commit,
2018-05-19)

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

builtin/fsck.c

@@ -382,7 +382,8 @@ out:
 	if (obj->type == OBJ_TREE)
 		free_tree_buffer((struct tree *)obj);
 	if (obj->type == OBJ_COMMIT)
-		free_commit_buffer((struct commit *)obj);
+		free_commit_buffer(the_repository->parsed_objects,
+				   (struct commit *)obj);
 	return err;
 }
 

builtin/log.c

@@ -395,7 +395,8 @@ static int cmd_log_walk(struct rev_info *rev)
 			 * We may show a given commit multiple times when
 			 * walking the reflogs.
 			 */
-			free_commit_buffer(commit);
+			free_commit_buffer(the_repository->parsed_objects,
+					   commit);
 			free_commit_list(commit->parents);
 			commit->parents = NULL;
 		}
@@ -1922,7 +1923,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		    open_next_file(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
 			die(_("Failed to create output files"));
 		shown = log_tree_commit(&rev, commit);
-		free_commit_buffer(commit);
+		free_commit_buffer(the_repository->parsed_objects,
+				   commit);
 
 		/* We put one extra blank line between formatted
 		 * patches and this flag is used by log-tree code

builtin/rev-list.c

@@ -196,7 +196,8 @@ static void finish_commit(struct commit *commit, void *data)
 		free_commit_list(commit->parents);
 		commit->parents = NULL;
 	}
-	free_commit_buffer(commit);
+	free_commit_buffer(the_repository->parsed_objects,
+			   commit);
 }
 
 static inline void finish_object__ma(struct object *obj)

commit.c

@@ -328,10 +328,10 @@ void repo_unuse_commit_buffer(struct repository *r,
 		free((void *)buffer);
 }
 
-void free_commit_buffer(struct commit *commit)
+void free_commit_buffer(struct parsed_object_pool *pool, struct commit *commit)
 {
 	struct commit_buffer *v = buffer_slab_peek(
-		the_repository->parsed_objects->buffer_slab, commit);
+		pool->buffer_slab, commit);
 	if (v) {
 		FREE_AND_NULL(v->buffer);
 		v->size = 0;
@@ -354,13 +354,12 @@ struct object_id *get_commit_tree_oid(const struct commit *commit)
 	return &get_commit_tree(commit)->object.oid;
 }
 
-void release_commit_memory(struct commit *c)
+void release_commit_memory(struct parsed_object_pool *pool, struct commit *c)
 {
 	c->maybe_tree = NULL;
 	c->index = 0;
-	free_commit_buffer(c);
+	free_commit_buffer(pool, c);
 	free_commit_list(c->parents);
-	/* TODO: what about commit->util? */
 
 	c->object.parsed = 0;
 }

commit.h

@@ -140,7 +140,7 @@ void repo_unuse_commit_buffer(struct repository *r,
 /*
  * Free any cached object buffer associated with the commit.
  */
-void free_commit_buffer(struct commit *);
+void free_commit_buffer(struct parsed_object_pool *pool, struct commit *);
 
 struct tree *get_commit_tree(const struct commit *);
 struct object_id *get_commit_tree_oid(const struct commit *);
@@ -149,7 +149,7 @@ struct object_id *get_commit_tree_oid(const struct commit *);
  * Release memory related to a commit, including the parent list and
  * any cached object buffer.
  */
-void release_commit_memory(struct commit *c);
+void release_commit_memory(struct parsed_object_pool *pool, struct commit *c);
 
 /*
  * Disassociate any cached object buffer from the commit, but do not free it.

object.c

@@ -540,7 +540,7 @@ void parsed_object_pool_clear(struct parsed_object_pool *o)
 		if (obj->type == OBJ_TREE)
 			free_tree_buffer((struct tree*)obj);
 		else if (obj->type == OBJ_COMMIT)
-			release_commit_memory((struct commit*)obj);
+			release_commit_memory(o, (struct commit*)obj);
 		else if (obj->type == OBJ_TAG)
 			release_tag_memory((struct tag*)obj);
 	}