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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354// SPDX-License-Identifier: GPL-2.0
//! Safety related APIs.
/// Checks that a precondition of an unsafe function is followed.////// The check is enabled at runtime if debug assertions (`CONFIG_RUST_DEBUG_ASSERTIONS`)/// are enabled. Otherwise, this macro is a no-op.////// # Examples////// ```no_run/// use kernel::unsafe_precondition_assert;////// struct RawBuffer<T: Copy, const N: usize> {/// data: [T; N],/// }////// impl<T: Copy, const N: usize> RawBuffer<T, N> {/// /// # Safety/// ////// /// The caller must ensure that `index` is less than `N`./// unsafe fn set_unchecked(&mut self, index: usize, value: T) {/// unsafe_precondition_assert!(/// index < N,/// "RawBuffer::set_unchecked() requires index ({index}) < N ({N})"/// );////// // SAFETY: By the safety requirements of this function, `index` is valid./// unsafe {/// *self.data.get_unchecked_mut(index) = value;/// }/// }/// }/// ```////// # Panics////// Panics if the expression is evaluated to [`false`] at runtime.#[macro_export]macro_rules! unsafe_precondition_assert { ($cond:expr $(,)?) => { $crate::unsafe_precondition_assert!(@inner $cond, ::core::stringify!($cond)) };
($cond:expr, $($arg:tt)+) => { $crate::unsafe_precondition_assert!(@inner $cond, $crate::prelude::fmt!($($arg)+)) };
(@inner $cond:expr, $msg:expr) => { ::core::debug_assert!($cond, "unsafe precondition violated: {}", $msg) };}