pub type jvmtiStackReferenceCallback = Option<unsafe extern "C" fn(root_kind: jvmtiHeapRootKind, class_tag: jlong, size: jlong, tag_ptr: *mut jlong, thread_tag: jlong, depth: jint, method: jmethodID, slot: jint, user_data: *mut c_void) -> jvmtiIterationControl>;