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Stage attribute default bytes through zeroed storage

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This commit is contained in:
Dennis Kobert
2026-09-07 15:38:11 +00:00
parent f7360688f2
commit 79750fb52d
1 changed files with 7 additions and 2 deletions
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9
node-graph/libraries/core-types/src/attribute.rs
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@@ -154,10 +154,15 @@ pub struct AttributeInfo {
pub write_stored: unsafe fn(&dyn AnyAttributeValue, *mut u8, &crate::arena::Arena) -> Option<()>,
}
/// The default's object representation, staged through zeroed storage so a
/// value with padding or an unused payload (`Option<f64>`'s `None`) hands the
/// caller deterministic bytes rather than whatever the stack held.
fn write_default_bytes<A: Attribute>(out: &mut [u8]) {
assert_eq!(out.len(), size_of::<A::Value<'static>>());
let value: A::Value<'static> = A::default();
unsafe { std::ptr::copy_nonoverlapping((&raw const value).cast::<u8>(), out.as_mut_ptr(), size_of::<A::Value<'static>>()) };
let mut staged = std::mem::MaybeUninit::<A::Value<'static>>::zeroed();
staged.write(A::default());
// SAFETY: the staging holds a live value of the type `out` is sized for.
unsafe { std::ptr::copy_nonoverlapping(staged.as_ptr().cast::<u8>(), out.as_mut_ptr(), size_of::<A::Value<'static>>()) };
}
fn field_write_at<A: Attribute>(level: u8) -> crate::record::FieldWrite