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rust: provide safe wrapper for MaybeUninit::zeroed()

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MaybeUninit::zeroed() is handy, but it introduces unsafe (and has a
pretty heavy syntax in general).  Introduce a trait that provides the
same functionality while staying within safe Rust.

In addition, MaybeUninit::zeroed() is not available as a "const"
function until Rust 1.75.0, so this also prepares for having handwritten
implementations of the trait until we can assume that version.

Reviewed-by: Junjie Mao <junjie.mao@hotmail.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-10-18 10:51:10 +02:00
parent c92c447ff0
commit 6e50bde1e1
6 changed files with 35 additions and 10 deletions
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1
rust/qemu-api/src/lib.rs
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@ -29,6 +29,7 @@ unsafe impl Sync for bindings::VMStateDescription {}
pub mod definitions;
pub mod device_class;
pub mod zeroable;
use std::alloc::{GlobalAlloc, Layout};