Separately allocate class_serial on 32-bit systems

On 32-bit systems, VWA causes class_serial to not be aligned (it only
guarantees 4 byte alignment but class_serial is 8 bytes and requires 8
byte alignment). This commit uses a hack to allocate class_serial
through malloc. Once VWA allocates with 8 byte alignment in the future,
we will revert this commit.

1 files changed, 4 insertions, 0 deletions

diff --git a/gc.c b/gc.c
index 02f3e0bbb4..aca15ad426 100644
--- a/gc.c
+++ b/gc.c
@@ -3132,6 +3132,10 @@ obj_free(rb_objspace_t *objspace, VALUE obj)
         rb_class_remove_subclass_head(obj);
 	rb_class_remove_from_module_subclasses(obj);
 	rb_class_remove_from_super_subclasses(obj);
+#if SIZEOF_SERIAL_T != SIZEOF_VALUE && USE_RVARGC
+        xfree(RCLASS(obj)->class_serial_ptr);
+#endif
+
 #if !USE_RVARGC
 	if (RCLASS_EXT(obj))
             xfree(RCLASS_EXT(obj));