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, 3 insertions, 0 deletions

diff --git a/class.c b/class.c
index 1281a243ab..9739aadc73 100644
--- a/class.c
+++ b/class.c
@@ -208,6 +208,9 @@ class_alloc(VALUE flags, VALUE klass)
 
 #if USE_RVARGC
     memset(RCLASS_EXT(obj), 0, sizeof(rb_classext_t));
+# if SIZEOF_SERIAL_T != SIZEOF_VALUE
+    RCLASS(obj)->class_serial_ptr = ZALLOC(rb_serial_t);
+# endif
 #else
     obj->ptr = ZALLOC(rb_classext_t);
 #endif