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style: Remove ThinBoxedSlice

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The only remaining consumers are ::-moz-tree pseudo-elements (we used to
use ThinBoxedSlice for other data structures in the past).

Those are not particularly performance sensitive so I think just
double-boxing is fine. In the future, if we wanted to avoid the double
indirection, we could probably use the "thin" crate
(https://docs.rs/thin) or similar, which stores the length of the slice
along with the allocation, making the pointer thin in all
configurations, much like "ThinArc" does:

  https://searchfox.org/mozilla-central/rev/1ce2eea39442190a71a1f8f650d098f286bf4a01/servo/components/servo_arc/lib.rs#891

In practice though, I don't think it's particularly worth it for this
specific case.

Differential Revision: https://phabricator.services.mozilla.com/D134672
This commit is contained in:
Emilio Cobos Álvarez 2023-06-06 23:25:18 +02:00 • committed by Oriol Brufau
parent fc4d185079
commit 5b62f66f6e
7 changed files with 5 additions and 43 deletions
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18
components/malloc_size_of/lib.rs
View file

@ -213,24 +213,6 @@ impl<T: MallocSizeOf + ?Sized> MallocSizeOf for Box<T> {
}
}
impl<T> MallocShallowSizeOf for thin_slice::ThinBoxedSlice<T> {
fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
let mut n = 0;
unsafe {
n += thin_slice::ThinBoxedSlice::spilled_storage(self)
.map_or(0, |ptr| ops.malloc_size_of(ptr));
n += ops.malloc_size_of(&**self);
}
n
}
}
impl<T: MallocSizeOf> MallocSizeOf for thin_slice::ThinBoxedSlice<T> {
fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
self.shallow_size_of(ops) + (**self).size_of(ops)
}
}
impl MallocSizeOf for () {
fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
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