commit-graph: store graph in struct object_store

Instead of storing commit graphs in static variables, store them in
struct object_store. There are no changes to the signatures of existing
functions - they all still only support the_repository, and support for
other instances of struct repository will be added in a subsequent
commit.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/commit-graph.c b/commit-graph.c
index 143a587581c267a342c05bbab64b4369bb911c01..b6a76a1413f6208c6b74a21e047f47dca5fa754a 100644 (file)
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -183,24 +183,20 @@ cleanup_fail:
        exit(1);
 }
 
-/* global storage */
-static struct commit_graph *commit_graph = NULL;
-
 static void prepare_commit_graph_one(const char *obj_dir)
 {
        char *graph_name;
 
-       if (commit_graph)
+       if (the_repository->objects->commit_graph)
                return;
 
        graph_name = get_commit_graph_filename(obj_dir);
-       commit_graph = load_commit_graph_one(graph_name);
+       the_repository->objects->commit_graph =
+               load_commit_graph_one(graph_name);
 
        FREE_AND_NULL(graph_name);
 }
 
-static int prepare_commit_graph_run_once = 0;
-
 /*
  * Return 1 if commit_graph is non-NULL, and 0 otherwise.
  *
@@ -212,9 +208,9 @@ static int prepare_commit_graph(void)
        struct alternate_object_database *alt;
        char *obj_dir;
 
-       if (prepare_commit_graph_run_once)
-               return !!commit_graph;
-       prepare_commit_graph_run_once = 1;
+       if (the_repository->objects->commit_graph_attempted)
+               return !!the_repository->objects->commit_graph;
+       the_repository->objects->commit_graph_attempted = 1;
 
        if (!core_commit_graph)
                return 0;
@@ -223,16 +219,16 @@ static int prepare_commit_graph(void)
        prepare_commit_graph_one(obj_dir);
        prepare_alt_odb(the_repository);
        for (alt = the_repository->objects->alt_odb_list;
-            !commit_graph && alt;
+            !the_repository->objects->commit_graph && alt;
             alt = alt->next)
                prepare_commit_graph_one(alt->path);
-       return !!commit_graph;
+       return !!the_repository->objects->commit_graph;
 }
 
 static void close_commit_graph(void)
 {
-       free_commit_graph(commit_graph);
-       commit_graph = NULL;
+       free_commit_graph(the_repository->objects->commit_graph);
+       the_repository->objects->commit_graph = NULL;
 }
 
 static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos)
@@ -342,7 +338,7 @@ int parse_commit_in_graph(struct commit *item)
 {
        if (!prepare_commit_graph())
                return 0;
-       return parse_commit_in_graph_one(commit_graph, item);
+       return parse_commit_in_graph_one(the_repository->objects->commit_graph, item);
 }
 
 void load_commit_graph_info(struct commit *item)
@@ -350,8 +346,8 @@ void load_commit_graph_info(struct commit *item)
        uint32_t pos;
        if (!prepare_commit_graph())
                return;
-       if (find_commit_in_graph(item, commit_graph, &pos))
-               fill_commit_graph_info(item, commit_graph, pos);
+       if (find_commit_in_graph(item, the_repository->objects->commit_graph, &pos))
+               fill_commit_graph_info(item, the_repository->objects->commit_graph, pos);
 }
 
 static struct tree *load_tree_for_commit(struct commit_graph *g, struct commit *c)
@@ -379,7 +375,7 @@ static struct tree *get_commit_tree_in_graph_one(struct commit_graph *g,
 
 struct tree *get_commit_tree_in_graph(const struct commit *c)
 {
-       return get_commit_tree_in_graph_one(commit_graph, c);
+       return get_commit_tree_in_graph_one(the_repository->objects->commit_graph, c);
 }
 
 static void write_graph_chunk_fanout(struct hashfile *f,
@@ -696,15 +692,17 @@ void write_commit_graph(const char *obj_dir,
 
        if (append) {
                prepare_commit_graph_one(obj_dir);
-               if (commit_graph)
-                       oids.alloc += commit_graph->num_commits;
+               if (the_repository->objects->commit_graph)
+                       oids.alloc += the_repository->objects->commit_graph->num_commits;
        }
 
        if (oids.alloc < 1024)
                oids.alloc = 1024;
        ALLOC_ARRAY(oids.list, oids.alloc);
 
-       if (append && commit_graph) {
+       if (append && the_repository->objects->commit_graph) {
+               struct commit_graph *commit_graph =
+                       the_repository->objects->commit_graph;
                for (i = 0; i < commit_graph->num_commits; i++) {
                        const unsigned char *hash = commit_graph->chunk_oid_lookup +
                                commit_graph->hash_len * i;

diff --git a/object-store.h b/object-store.h
index 0e13543babf4f8221d09e4d1417fdc238c0bcf14..e481f7ad41bd876df3fb98f1578c38f55fc288e5 100644 (file)
--- a/object-store.h
+++ b/object-store.h
@@ -106,6 +106,9 @@ struct raw_object_store {
         */
        struct oidmap *replace_map;
 
+       struct commit_graph *commit_graph;
+       unsigned commit_graph_attempted : 1; /* if loading has been attempted */
+
        /*
         * private data
         *

diff --git a/object.c b/object.c
index b0faab85d40ae8a04cc219085d1b70531f179c82..e2c112cc1a757f666ce3ca234227c98abf146910 100644 (file)
--- a/object.c
+++ b/object.c
@@ -9,6 +9,7 @@
 #include "alloc.h"
 #include "object-store.h"
 #include "packfile.h"
+#include "commit-graph.h"
 
 unsigned int get_max_object_index(void)
 {
@@ -507,6 +508,10 @@ void raw_object_store_clear(struct raw_object_store *o)
        oidmap_free(o->replace_map, 1);
        FREE_AND_NULL(o->replace_map);
 
+       free_commit_graph(o->commit_graph);
+       o->commit_graph = NULL;
+       o->commit_graph_attempted = 0;
+
        free_alt_odbs(o);
        o->alt_odb_tail = NULL;