add read barrier to value.p

API changes:
- value.p must be accessed via mrb_value_p macro
- value.p must be mutated via MRB_SET_VALUE_P macro

1 files changed, 1 insertions, 1 deletions

diff --git a/src/etc.c b/src/etc.c
index 2aee0f0f7..368685cf1 100644
--- a/src/etc.c
+++ b/src/etc.c
@@ -176,7 +176,7 @@ mrb_obj_id(mrb_value obj)
   case  MRB_TT_FILE:
   case  MRB_TT_DATA:
   default:
-    return MakeID(obj.value.p);
+    return MakeID(mrb_value_p(obj));
   }
 }