rebase -i: respect core.abbrev

diff --git a/object.c b/object.c
index 243d694a58334cc45df6f38878d094ed419188ce..5f792cbfd38c0b30d763902ba5f9399992ddab89 100644 (file)
--- a/object.c
+++ b/object.c
@@ -43,16 +43,17 @@ int type_from_string(const char *str)
        die("invalid object type \"%s\"", str);
 }
 
-static unsigned int hash_obj(struct object *obj, unsigned int n)
+static unsigned int hash_obj(const unsigned char *sha1, unsigned int n)
 {
        unsigned int hash;
-       memcpy(&hash, obj->sha1, sizeof(unsigned int));
-       return hash % n;
+       memcpy(&hash, sha1, sizeof(unsigned int));
+       /* Assumes power-of-2 hash sizes in grow_object_hash */
+       return hash & (n - 1);
 }
 
 static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size)
 {
-       unsigned int j = hash_obj(obj, size);
+       unsigned int j = hash_obj(obj->sha1, size);
 
        while (hash[j]) {
                j++;
@@ -62,22 +63,15 @@ static void insert_obj_hash(struct object *obj, struct object **hash, unsigned i
        hash[j] = obj;
 }
 
-static unsigned int hashtable_index(const unsigned char *sha1)
-{
-       unsigned int i;
-       memcpy(&i, sha1, sizeof(unsigned int));
-       return i % obj_hash_size;
-}
-
 struct object *lookup_object(const unsigned char *sha1)
 {
-       unsigned int i;
+       unsigned int i, first;
        struct object *obj;
 
        if (!obj_hash)
                return NULL;
 
-       i = hashtable_index(sha1);
+       first = i = hash_obj(sha1, obj_hash_size);
        while ((obj = obj_hash[i]) != NULL) {
                if (!hashcmp(sha1, obj->sha1))
                        break;
@@ -85,12 +79,26 @@ struct object *lookup_object(const unsigned char *sha1)
                if (i == obj_hash_size)
                        i = 0;
        }
+       if (obj && i != first) {
+               /*
+                * Move object to where we started to look for it so
+                * that we do not need to walk the hash table the next
+                * time we look for it.
+                */
+               struct object *tmp = obj_hash[i];
+               obj_hash[i] = obj_hash[first];
+               obj_hash[first] = tmp;
+       }
        return obj;
 }
 
 static void grow_object_hash(void)
 {
        int i;
+       /*
+        * Note that this size must always be power-of-2 to match hash_obj
+        * above.
+        */
        int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
        struct object **new_hash;
 
@@ -135,7 +143,7 @@ struct object *lookup_unknown_object(const unsigned char *sha1)
 struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p)
 {
        struct object *obj;
-       int eaten = 0;
+       *eaten_p = 0;
 
        obj = NULL;
        if (type == OBJ_BLOB) {
@@ -154,7 +162,7 @@ struct object *parse_object_buffer(const unsigned char *sha1, enum object_type t
                        if (!tree->object.parsed) {
                                if (parse_tree_buffer(tree, buffer, size))
                                        return NULL;
-                               eaten = 1;
+                               *eaten_p = 1;
                        }
                }
        } else if (type == OBJ_COMMIT) {
@@ -164,7 +172,7 @@ struct object *parse_object_buffer(const unsigned char *sha1, enum object_type t
                                return NULL;
                        if (!commit->buffer) {
                                commit->buffer = buffer;
-                               eaten = 1;
+                               *eaten_p = 1;
                        }
                        obj = &commit->object;
                }
@@ -181,7 +189,6 @@ struct object *parse_object_buffer(const unsigned char *sha1, enum object_type t
        }
        if (obj && obj->type == OBJ_NONE)
                obj->type = type;
-       *eaten_p = eaten;
        return obj;
 }