object: drop parsed_object_pool->commit_count

14ba97f8 (alloc: allow arbitrary repositories for alloc functions,
2018-05-15) introduced parsed_object_pool->commit_count to keep count of
commits per repository and was used to assign commit->index.

However, commit-slab code requires commit->index values to be unique
and a global count would be correct, rather than a per-repo count.

Let's introduce a static counter variable, `parsed_commits_count` to
keep track of parsed commits so far.

As commit_count has no use anymore, let's also drop it from the struct.

Signed-off-by: Abhishek Kumar <abhishekkumar8222@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

alloc.c

@@ -99,15 +99,21 @@ void *alloc_object_node(struct repository *r)
 	return obj;
 }
 
-static unsigned int alloc_commit_index(struct repository *r)
+/*
+ * The returned count is to be used as an index into commit slabs,
+ * that are *NOT* maintained per repository, and that is why a single
+ * global counter is used.
+ */
+static unsigned int alloc_commit_index(void)
 {
-	return r->parsed_objects->commit_count++;
+	static unsigned int parsed_commits_count;
+	return parsed_commits_count++;
 }
 
-void init_commit_node(struct repository *r, struct commit *c)
+void init_commit_node(struct commit *c)
 {
 	c->object.type = OBJ_COMMIT;
-	c->index = alloc_commit_index(r);
+	c->index = alloc_commit_index();
 	c->graph_pos = COMMIT_NOT_FROM_GRAPH;
 	c->generation = GENERATION_NUMBER_INFINITY;
 }
@@ -115,7 +121,7 @@ void init_commit_node(struct repository *r, struct commit *c)
 void *alloc_commit_node(struct repository *r)
 {
 	struct commit *c = alloc_node(r->parsed_objects->commit_state, sizeof(struct commit));
-	init_commit_node(r, c);
+	init_commit_node(c);
 	return c;
 }
 

alloc.h

@@ -9,7 +9,7 @@ struct repository;
 
 void *alloc_blob_node(struct repository *r);
 void *alloc_tree_node(struct repository *r);
-void init_commit_node(struct repository *r, struct commit *c);
+void init_commit_node(struct commit *c);
 void *alloc_commit_node(struct repository *r);
 void *alloc_tag_node(struct repository *r);
 void *alloc_object_node(struct repository *r);

blob.c

@@ -10,7 +10,7 @@ struct blob *lookup_blob(struct repository *r, const struct object_id *oid)
 	struct object *obj = lookup_object(r, oid);
 	if (!obj)
 		return create_object(r, oid, alloc_blob_node(r));
-	return object_as_type(r, obj, OBJ_BLOB, 0);
+	return object_as_type(obj, OBJ_BLOB, 0);
 }
 
 int parse_blob_buffer(struct blob *item, void *buffer, unsigned long size)

builtin/commit-graph.c

@@ -154,7 +154,7 @@ static int read_one_commit(struct oidset *commits, struct progress *progress,
 			   NULL, 0);
 	if (!result)
 		return error(_("invalid object: %s"), hash);
-	else if (object_as_type(the_repository, result, OBJ_COMMIT, 1))
+	else if (object_as_type(result, OBJ_COMMIT, 1))
 		oidset_insert(commits, &result->oid);
 
 	display_progress(progress, oidset_size(commits));

builtin/fsck.c

@@ -241,7 +241,7 @@ static void mark_unreachable_referents(const struct object_id *oid)
 		enum object_type type = oid_object_info(the_repository,
 							&obj->oid, NULL);
 		if (type > 0)
-			object_as_type(the_repository, obj, type, 0);
+			object_as_type(obj, type, 0);
 	}
 
 	options.walk = mark_used;

commit.c

@@ -37,7 +37,7 @@ struct commit *lookup_commit_reference_gently(struct repository *r,
 
 	if (!obj)
 		return NULL;
-	return object_as_type(r, obj, OBJ_COMMIT, quiet);
+	return object_as_type(obj, OBJ_COMMIT, quiet);
 }
 
 struct commit *lookup_commit_reference(struct repository *r, const struct object_id *oid)
@@ -62,7 +62,7 @@ struct commit *lookup_commit(struct repository *r, const struct object_id *oid)
 	struct object *obj = lookup_object(r, oid);
 	if (!obj)
 		return create_object(r, oid, alloc_commit_node(r));
-	return object_as_type(r, obj, OBJ_COMMIT, 0);
+	return object_as_type(obj, OBJ_COMMIT, 0);
 }
 
 struct commit *lookup_commit_reference_by_name(const char *name)

object.c

@@ -157,13 +157,13 @@ void *create_object(struct repository *r, const struct object_id *oid, void *o)
 	return obj;
 }
 
-void *object_as_type(struct repository *r, struct object *obj, enum object_type type, int quiet)
+void *object_as_type(struct object *obj, enum object_type type, int quiet)
 {
 	if (obj->type == type)
 		return obj;
 	else if (obj->type == OBJ_NONE) {
 		if (type == OBJ_COMMIT)
-			init_commit_node(r, (struct commit *) obj);
+			init_commit_node((struct commit *) obj);
 		else
 			obj->type = type;
 		return obj;

object.h

@@ -15,7 +15,6 @@ struct parsed_object_pool {
 	struct alloc_state *commit_state;
 	struct alloc_state *tag_state;
 	struct alloc_state *object_state;
-	unsigned commit_count;
 
 	/* parent substitutions from .git/info/grafts and .git/shallow */
 	struct commit_graft **grafts;
@@ -121,7 +120,7 @@ struct object *lookup_object(struct repository *r, const struct object_id *oid);
 
 void *create_object(struct repository *r, const struct object_id *oid, void *obj);
 
-void *object_as_type(struct repository *r, struct object *obj, enum object_type type, int quiet);
+void *object_as_type(struct object *obj, enum object_type type, int quiet);
 
 /*
  * Returns the object, having parsed it to find out what it is.

refs.c

@@ -339,7 +339,7 @@ enum peel_status peel_object(const struct object_id *name, struct object_id *oid
 
 	if (o->type == OBJ_NONE) {
 		int type = oid_object_info(the_repository, name, NULL);
-		if (type < 0 || !object_as_type(the_repository, o, type, 0))
+		if (type < 0 || !object_as_type(o, type, 0))
 			return PEEL_INVALID;
 	}
 

t/helper/test-reach.c

@@ -67,7 +67,7 @@ int cmd__reach(int ac, const char **av)
 			die("failed to load commit for input %s resulting in oid %s\n",
 			    buf.buf, oid_to_hex(&oid));
 
-		c = object_as_type(r, peeled, OBJ_COMMIT, 0);
+		c = object_as_type(peeled, OBJ_COMMIT, 0);
 
 		if (!c)
 			die("failed to load commit for input %s resulting in oid %s\n",

tag.c

@@ -103,7 +103,7 @@ struct tag *lookup_tag(struct repository *r, const struct object_id *oid)
 	struct object *obj = lookup_object(r, oid);
 	if (!obj)
 		return create_object(r, oid, alloc_tag_node(r));
-	return object_as_type(r, obj, OBJ_TAG, 0);
+	return object_as_type(obj, OBJ_TAG, 0);
 }
 
 static timestamp_t parse_tag_date(const char *buf, const char *tail)

tree.c

@@ -200,7 +200,7 @@ struct tree *lookup_tree(struct repository *r, const struct object_id *oid)
 	struct object *obj = lookup_object(r, oid);
 	if (!obj)
 		return create_object(r, oid, alloc_tree_node(r));
-	return object_as_type(r, obj, OBJ_TREE, 0);
+	return object_as_type(obj, OBJ_TREE, 0);
 }
 
 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)