ko1	2019-02-12 12:45:15 +0900 (Tue, 12 Feb 2019)

  New Revision: 67054

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=67054

  Log:
    fix empty Hash memsize.
    
    * gc.c (obj_memsize_of): ar_table ptr can be NULL (size == 0).

  Modified files:
    trunk/gc.c
Index: gc.c
===================================================================
--- gc.c	(revision 67053)
+++ gc.c	(revision 67054)
@@ -3356,8 +3356,10 @@ obj_memsize_of(VALUE obj, int use_all_ty https://github.com/ruby/ruby/blob/trunk/gc.c#L3356
 	break;
       case T_HASH:
         if (RHASH_AR_TABLE_P(obj)) {
-            size_t rb_hash_ar_table_size();
-            size += rb_hash_ar_table_size();
+            if (RHASH_AR_TABLE(obj) != NULL) {
+                size_t rb_hash_ar_table_size();
+                size += rb_hash_ar_table_size();
+            }
 	}
         else {
             VM_ASSERT(RHASH_ST_TABLE(obj) != NULL);

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