NaN-boxed JsValues
#1830
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NaN-boxed JsValues
#1830
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HalidOdat
added
performance
Test262 conformance changesVM implementation
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Codecov Report
@@ Coverage Diff @@
## main #1830 +/- ##
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- Coverage 41.33% 41.09% -0.25%
==========================================
Files 234 236 +2
Lines 22019 22121 +102
==========================================
- Hits 9101 9090 -11
- Misses 12918 13031 +113
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Does rust-lang/rust#73328 affect the WebAssembly build? |
I don't think it would, but I'll need to test this :) |
HalidOdat
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It works just fine 🚀 |
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jedel1043
reviewed
Feb 28, 2022
HalidOdat
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Didn't want to squash the commits but the rebase was pretty painful otherwise. |
HalidOdat
commented
Mar 3, 2022
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For now I undid returning refs. I'm thinking more carefully about how we can return refs without causing too much havoc, I'll make a PoC soon |
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The way I thought of doing it was by having a wrapper struct on #[derive(Debug)]
pub struct Ref<'a, T> {
inner: ManuallyDrop<T>,
_marker: PhantomData<&'a T>,
}
impl<T> Ref<'_, T> {
#[inline]
fn new(inner: ManuallyDrop<T>) -> Self {
Self {
inner,
_marker: PhantomData,
}
}
}
impl<T> std::borrow::Borrow<T> for Ref<'_, T> {
fn borrow(&self) -> &T {
&*self.inner
}
}
impl<T> AsRef<T> for Ref<'_, T> {
fn as_ref(&self) -> &T {
&*self.inner
}
}
impl<T> std::ops::Deref for Ref<'_, T> {
type Target = T;
#[inline]
fn deref(&self) -> &Self::Target {
&*self.inner
}
}This struct must not implement |
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Nice! Should I make a PR with the changes or do you plan on doing it? |
Sure, you can do it if you want! :) |
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Is there anything else missing? |
Not sure, it should work. I'll debug it when I get some time this week :) |
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OK, this is pretty much ready, I think. It's feature gated, |
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Moving it for 0.16 to give some time for deeper reviewing, as discussed in Discord. |
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Moving to 0.17, because I had a slightly safer API using a |
Co-authored-by: HalidOdat <halidodat@gmail.com>
jedel1043
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jedel1043
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Blocked since we want to first abstract |
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This Pull Request fixes/closes #1373
This PR implements
JsValueNaN boxing It is a work in progress, and requires a lot more changes.