diff options
| author | Miguel Ojeda <ojeda@kernel.org> | 2022-11-10 17:41:36 +0100 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2022-12-04 01:59:16 +0100 |
| commit | ef9e37973c3a50497c943e70d577dad10a8e41f2 (patch) | |
| tree | c37456e5676a9169156ad4a03926655dfc27f064 | |
| parent | bee1688940b9264a9960e6afdac36a4af35f1f4b (diff) | |
rust: static_assert: add `static_assert!` macro
Add the `static_assert!` macro, which is a compile-time assert, similar
to the C11 `_Static_assert` and C++11 `static_assert` declarations [1,2].
Do so in a new module, called `static_assert`.
For instance:
static_assert!(42 > 24);
static_assert!(core::mem::size_of::<u8>() == 1);
const X: &[u8] = b"bar";
static_assert!(X[1] == b'a');
const fn f(x: i32) -> i32 {
x + 2
}
static_assert!(f(40) == 42);
Link: https://en.cppreference.com/w/c/language/_Static_assert [1]
Link: https://en.cppreference.com/w/cpp/language/static_assert [2]
Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
| -rw-r--r-- | rust/kernel/lib.rs | 1 | ||||
| -rw-r--r-- | rust/kernel/prelude.rs | 2 | ||||
| -rw-r--r-- | rust/kernel/static_assert.rs | 34 |
3 files changed, 37 insertions, 0 deletions
diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs index d6371c9c8453..9b83ef736298 100644 --- a/rust/kernel/lib.rs +++ b/rust/kernel/lib.rs @@ -26,6 +26,7 @@ mod allocator; pub mod error; pub mod prelude; pub mod print; +mod static_assert; #[doc(hidden)] pub mod std_vendor; pub mod str; diff --git a/rust/kernel/prelude.rs b/rust/kernel/prelude.rs index 345fc9075d1f..178fe8e6cb6d 100644 --- a/rust/kernel/prelude.rs +++ b/rust/kernel/prelude.rs @@ -19,6 +19,8 @@ pub use macros::{module, vtable}; pub use super::{dbg, pr_alert, pr_crit, pr_debug, pr_emerg, pr_err, pr_info, pr_notice, pr_warn}; +pub use super::static_assert; + pub use super::error::{code::*, Error, Result}; pub use super::{str::CStr, ThisModule}; diff --git a/rust/kernel/static_assert.rs b/rust/kernel/static_assert.rs new file mode 100644 index 000000000000..3115ee0ba8e9 --- /dev/null +++ b/rust/kernel/static_assert.rs @@ -0,0 +1,34 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Static assert. + +/// Static assert (i.e. compile-time assert). +/// +/// Similar to C11 [`_Static_assert`] and C++11 [`static_assert`]. +/// +/// The feature may be added to Rust in the future: see [RFC 2790]. +/// +/// [`_Static_assert`]: https://en.cppreference.com/w/c/language/_Static_assert +/// [`static_assert`]: https://en.cppreference.com/w/cpp/language/static_assert +/// [RFC 2790]: https://github.com/rust-lang/rfcs/issues/2790 +/// +/// # Examples +/// +/// ``` +/// static_assert!(42 > 24); +/// static_assert!(core::mem::size_of::<u8>() == 1); +/// +/// const X: &[u8] = b"bar"; +/// static_assert!(X[1] == b'a'); +/// +/// const fn f(x: i32) -> i32 { +/// x + 2 +/// } +/// static_assert!(f(40) == 42); +/// ``` +#[macro_export] +macro_rules! static_assert { + ($condition:expr) => { + const _: () = core::assert!($condition); + }; +} |