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use std::any::Any;
use wasmer_vm::{StoreHandle, VMExternObj, VMExternRef};
use super::store::{AsStoreMut, AsStoreRef};
#[derive(Debug, Clone)]
#[repr(transparent)]
pub struct ExternRef {
handle: StoreHandle<VMExternObj>,
}
impl ExternRef {
pub fn new<T>(store: &mut impl AsStoreMut, value: T) -> Self
where
T: Any + Send + Sync + 'static + Sized,
{
Self {
handle: StoreHandle::new(store.objects_mut(), VMExternObj::new(value)),
}
}
pub fn downcast<'a, T>(&self, store: &'a impl AsStoreRef) -> Option<&'a T>
where
T: Any + Send + Sync + 'static + Sized,
{
self.handle
.get(store.as_store_ref().objects())
.as_ref()
.downcast_ref::<T>()
}
pub(crate) fn vm_externref(&self) -> VMExternRef {
VMExternRef(self.handle.internal_handle())
}
pub(crate) unsafe fn from_vm_externref(
store: &mut impl AsStoreMut,
vm_externref: VMExternRef,
) -> Self {
Self {
handle: StoreHandle::from_internal(store.objects_mut().id(), vm_externref.0),
}
}
pub fn is_from_store(&self, store: &impl AsStoreRef) -> bool {
self.handle.store_id() == store.as_store_ref().objects().id()
}
}