X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=object.c;h=cf5931a9423cb2ecdd9f34e6c33ed0b714ce61bf;hb=1e80e0449248edb77b0fb9853f4a3404a599e207;hp=72f6aa552f79edcd5f4f5c4a647ab62503365b1b;hpb=e8c80638abc99928dba9ac832589749a531e2e21;p=git.git

diff --git a/object.c b/object.c
index 72f6aa55..cf5931a9 100644
--- a/object.c
+++ b/object.c
@@ -9,6 +9,8 @@ struct object **objs;
 int nr_objs;
 static int obj_allocs;
 
+int track_object_refs = 1;
+
 static int find_object(const unsigned char *sha1)
 {
 	int first = 0, last = nr_objs;
@@ -65,35 +67,71 @@ void created_object(const unsigned char *sha1, struct object *obj)
 	nr_objs++;
 }
 
-void add_ref(struct object *refer, struct object *target)
+struct object_refs *alloc_object_refs(unsigned count)
+{
+	struct object_refs *refs;
+	size_t size = sizeof(*refs) + count*sizeof(struct object *);
+
+	refs = xmalloc(size);
+	memset(refs, 0, size);
+	refs->count = count;
+	return refs;
+}
+
+static int compare_object_pointers(const void *a, const void *b)
 {
-	struct object_list **pp = &refer->refs;
-	struct object_list *p;
-	
-	while ((p = *pp) != NULL) {
-		if (p->item == target)
-			return;
-		pp = &p->next;
+	const struct object * const *pa = a;
+	const struct object * const *pb = b;
+	if (*pa == *pb)
+		return 0;
+	else if (*pa < *pb)
+		return -1;
+	else
+		return 1;
+}
+
+void set_object_refs(struct object *obj, struct object_refs *refs)
+{
+	unsigned int i, j;
+
+	/* Do not install empty list of references */
+	if (refs->count < 1) {
+		free(refs);
+		return;
 	}
 
-	target->used = 1;
-	p = xmalloc(sizeof(*p));
-	p->item = target;
-	p->next = NULL;
-	*pp = p;
+	/* Sort the list and filter out duplicates */
+	qsort(refs->ref, refs->count, sizeof(refs->ref[0]),
+	      compare_object_pointers);
+	for (i = j = 1; i < refs->count; i++) {
+		if (refs->ref[i] != refs->ref[i - 1])
+			refs->ref[j++] = refs->ref[i];
+	}
+	if (j < refs->count) {
+		/* Duplicates were found - reallocate list */
+		size_t size = sizeof(*refs) + j*sizeof(struct object *);
+		refs->count = j;
+		refs = xrealloc(refs, size);
+	}
+
+	for (i = 0; i < refs->count; i++)
+		refs->ref[i]->used = 1;
+	obj->refs = refs;
 }
 
 void mark_reachable(struct object *obj, unsigned int mask)
 {
-	struct object_list *p = obj->refs;
-
+	if (!track_object_refs)
+		die("cannot do reachability with object refs turned off");
 	/* If we've been here already, don't bother */
 	if (obj->flags & mask)
 		return;
 	obj->flags |= mask;
-	while (p) {
-		mark_reachable(p->item, mask);
-		p = p->next;
+	if (obj->refs) {
+		const struct object_refs *refs = obj->refs;
+		unsigned i;
+		for (i = 0; i < refs->count; i++)
+			mark_reachable(refs->ref[i], mask);
 	}
 }
 
@@ -184,6 +222,17 @@ struct object_list *object_list_insert(struct object *item,
         return new_list;
 }
 
+void object_list_append(struct object *item,
+			struct object_list **list_p)
+{
+	while (*list_p) {
+		list_p = &((*list_p)->next);
+	}
+	*list_p = xmalloc(sizeof(struct object_list));
+	(*list_p)->next = NULL;
+	(*list_p)->item = item;
+}
+
 unsigned object_list_length(struct object_list *list)
 {
 	unsigned ret = 0;