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0823837224
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org> Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
37 lines
1.5 KiB
Rust
37 lines
1.5 KiB
Rust
// SPDX-License-Identifier: GPL-2.0-or-later
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//! Defines a trait for structs that can be safely initialized with zero bytes.
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/// Encapsulates the requirement that
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/// `MaybeUninit::<Self>::zeroed().assume_init()` does not cause undefined
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/// behavior.
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///
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/// # Safety
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///
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/// Do not add this trait to a type unless all-zeroes is a valid value for the
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/// type. In particular, raw pointers can be zero, but references and
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/// `NonNull<T>` cannot.
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pub unsafe trait Zeroable: Default {
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/// Return a value of Self whose memory representation consists of all
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/// zeroes, with the possible exclusion of padding bytes.
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const ZERO: Self = unsafe { ::core::mem::MaybeUninit::<Self>::zeroed().assume_init() };
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}
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// bindgen does not derive Default here
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#[allow(clippy::derivable_impls)]
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impl Default for crate::bindings::VMStateFlags {
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fn default() -> Self {
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Self(0)
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}
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}
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unsafe impl Zeroable for crate::bindings::Property__bindgen_ty_1 {}
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unsafe impl Zeroable for crate::bindings::Property {}
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unsafe impl Zeroable for crate::bindings::VMStateFlags {}
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unsafe impl Zeroable for crate::bindings::VMStateField {}
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unsafe impl Zeroable for crate::bindings::VMStateDescription {}
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unsafe impl Zeroable for crate::bindings::MemoryRegionOps__bindgen_ty_1 {}
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unsafe impl Zeroable for crate::bindings::MemoryRegionOps__bindgen_ty_2 {}
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unsafe impl Zeroable for crate::bindings::MemoryRegionOps {}
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unsafe impl Zeroable for crate::bindings::MemTxAttrs {}
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unsafe impl Zeroable for crate::bindings::CharBackend {}
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