revision: use object_array_filter() in implementation of gc_boundary()

Use object_array_filter(), which will soon be made smarter about
cleaning up discarded entries properly.  Also add a function comment.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/revision.c b/revision.c
index 8ac88d6..be73cb4 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -2435,25 +2435,23 @@ static struct commit *get_revision_1(struct rev_info *revs)
        return NULL;
 }
 
-static void gc_boundary(struct object_array *array)
+/*
+ * Return true for entries that have not yet been shown.  (This is an
+ * object_array_each_func_t.)
+ */
+static int entry_unshown(struct object_array_entry *entry, void *cb_data_unused)
 {
-       unsigned nr = array->nr;
-       unsigned alloc = array->alloc;
-       struct object_array_entry *objects = array->objects;
+       return !(entry->item->flags & SHOWN);
+}
 
-       if (alloc <= nr) {
-               unsigned i, j;
-               for (i = j = 0; i < nr; i++) {
-                       if (objects[i].item->flags & SHOWN)
-                               continue;
-                       if (i != j)
-                               objects[j] = objects[i];
-                       j++;
-               }
-               for (i = j; i < nr; i++)
-                       objects[i].item = NULL;
-               array->nr = j;
-       }
+/*
+ * If array is on the verge of a realloc, garbage-collect any entries
+ * that have already been shown to try to free up some space.
+ */
+static void gc_boundary(struct object_array *array)
+{
+       if (array->nr == array->alloc)
+               object_array_filter(array, entry_unshown, NULL);
 }
 
 static void create_boundary_commit_list(struct rev_info *revs)