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Use new pointer metadata API inside libcore instead of manual transmutes

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This commit is contained in:
Simon Sapin 2021-01-18 17:18:13 +01:00
parent c0e3a1b096
commit 787f4de6ab
5 changed files with 100 additions and 42 deletions
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11
library/core/src/ptr/const_ptr.rs
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@ -916,9 +916,14 @@ impl<T> *const [T] {
#[unstable(feature = "slice_ptr_len", issue = "71146")]
#[rustc_const_unstable(feature = "const_slice_ptr_len", issue = "71146")]
pub const fn len(self) -> usize {
// SAFETY: this is safe because `*const [T]` and `FatPtr<T>` have the same layout.
// Only `std` can make this guarantee.
unsafe { Repr { rust: self }.raw }.len
#[cfg(bootstrap)]
{
// SAFETY: this is safe because `*const [T]` and `FatPtr<T>` have the same layout.
// Only `std` can make this guarantee.
unsafe { Repr { rust: self }.raw }.len
}
#[cfg(not(bootstrap))]
metadata(self)
}
/// Returns a raw pointer to the slice's buffer.