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8a88b55f69
Allow "cargo test --doc" to pass. Reviewed-by: Junjie Mao <junjie.mao@hotmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
86 lines
2.6 KiB
Rust
86 lines
2.6 KiB
Rust
// SPDX-License-Identifier: GPL-2.0-or-later
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use std::ptr;
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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. This trait in principle could be implemented as just:
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///
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/// ```
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/// pub unsafe trait Zeroable: Default {
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/// const ZERO: Self = unsafe { ::core::mem::MaybeUninit::<Self>::zeroed().assume_init() };
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/// }
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/// ```
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///
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/// The need for a manual implementation is only because `zeroed()` cannot
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/// be used as a `const fn` prior to Rust 1.75.0. Once we can assume a new
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/// enough version of the compiler, we could provide a `#[derive(Zeroable)]`
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/// macro to check at compile-time that all struct fields are Zeroable, and
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/// use the above blanket implementation of the `ZERO` constant.
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///
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/// # Safety
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///
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/// Because the implementation of `ZERO` is manual, it does not make
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/// any assumption on the safety of `zeroed()`. However, other users of the
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/// trait could use it that way. Do not add this trait to a type unless
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/// all-zeroes is a valid value for the type. In particular, remember that
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/// raw pointers can be zero, but references and `NonNull<T>` cannot
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pub unsafe trait Zeroable: Default {
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const ZERO: Self;
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}
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unsafe impl Zeroable for crate::bindings::Property__bindgen_ty_1 {
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const ZERO: Self = Self { i: 0 };
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}
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unsafe impl Zeroable for crate::bindings::Property {
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const ZERO: Self = Self {
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name: ptr::null(),
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info: ptr::null(),
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offset: 0,
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bitnr: 0,
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bitmask: 0,
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set_default: false,
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defval: Zeroable::ZERO,
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arrayoffset: 0,
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arrayinfo: ptr::null(),
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arrayfieldsize: 0,
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link_type: ptr::null(),
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};
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}
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unsafe impl Zeroable for crate::bindings::VMStateDescription {
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const ZERO: Self = Self {
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name: ptr::null(),
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unmigratable: false,
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early_setup: false,
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version_id: 0,
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minimum_version_id: 0,
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priority: crate::bindings::MigrationPriority::MIG_PRI_DEFAULT,
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pre_load: None,
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post_load: None,
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pre_save: None,
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post_save: None,
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needed: None,
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dev_unplug_pending: None,
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fields: ptr::null(),
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subsections: ptr::null(),
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};
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}
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unsafe impl Zeroable for crate::bindings::MemoryRegionOps__bindgen_ty_1 {
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const ZERO: Self = Self {
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min_access_size: 0,
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max_access_size: 0,
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unaligned: false,
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accepts: None,
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};
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}
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unsafe impl Zeroable for crate::bindings::MemoryRegionOps__bindgen_ty_2 {
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const ZERO: Self = Self {
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min_access_size: 0,
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max_access_size: 0,
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unaligned: false,
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};
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}
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