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replace Vec<u8> with Box<[u8]>

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This commit is contained in:
The8472 2021-08-05 19:52:08 +02:00
parent 6ed2d870fc
commit 55def120a4
1 changed files with 4 additions and 5 deletions
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9
compiler/rustc_middle/src/mir/interpret/allocation.rs
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@ -28,7 +28,7 @@ use crate::ty;
pub struct Allocation<Tag = AllocId, Extra = ()> {
/// The actual bytes of the allocation.
/// Note that the bytes of a pointer represent the offset of the pointer.
bytes: Vec<u8>,
bytes: Box<[u8]>,
/// Maps from byte addresses to extra data for each pointer.
/// Only the first byte of a pointer is inserted into the map; i.e.,
/// every entry in this map applies to `pointer_size` consecutive bytes starting
@ -112,7 +112,7 @@ impl<Tag> Allocation<Tag> {
align: Align,
mutability: Mutability,
) -> Self {
let bytes = slice.into().into_owned();
let bytes = Box::<[u8]>::from(slice.into());
let size = Size::from_bytes(bytes.len());
Self {
bytes,
@ -145,9 +145,8 @@ impl<Tag> Allocation<Tag> {
});
InterpError::ResourceExhaustion(ResourceExhaustionInfo::MemoryExhausted)
})?;
// SAFETY: This turns a Box<[MaybeUninit<u8>]> into a Vec<u8>. This is safe since the box
// was zero-allocated which is a valid value for u8.
let bytes = unsafe { bytes.assume_init().into_vec() };
// SAFETY: the box was zero-allocated, which is a valid initial value for Box<[u8]>
let bytes = unsafe { bytes.assume_init() };
Ok(Allocation {
bytes,
relocations: Relocations::new(),