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Don't call assume_init on Deferred's Data #779

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Feb 5, 2022
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Don't call assume_init on Deferred's Data #779

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8 changes: 4 additions & 4 deletions crossbeam-epoch/src/deferred.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ type Data = [usize; DATA_WORDS];
/// This is a handy way of keeping an unsized `FnOnce()` within a sized structure.
pub(crate) struct Deferred {
call: unsafe fn(*mut u8),
data: Data,
data: MaybeUninit<Data>,
_marker: PhantomData<*mut ()>, // !Send + !Sync
}

Expand Down Expand Up @@ -46,7 +46,7 @@ impl Deferred {

Deferred {
call: call::<F>,
data: data.assume_init(),
data,
_marker: PhantomData,
}
} else {
Expand All @@ -64,7 +64,7 @@ impl Deferred {

Deferred {
call: call::<F>,
data: data.assume_init(),
data,
_marker: PhantomData,
}
}
Expand All @@ -75,7 +75,7 @@ impl Deferred {
#[inline]
pub(crate) fn call(mut self) {
let call = self.call;
unsafe { call(&mut self.data as *mut Data as *mut u8) };
unsafe { call(self.data.as_mut_ptr() as *mut u8) };
}
}

Expand Down