On Wed, Oct 30, 2024 at 5:59 AM David Gow <davidgow@xxxxxxxxxx> wrote: > > On Tue, 29 Oct 2024 at 20:08, Alice Ryhl <aliceryhl@xxxxxxxxxx> wrote: > > > > On Tue, Oct 29, 2024 at 10:24 AM David Gow <davidgow@xxxxxxxxxx> wrote: > > > > > > From: José Expósito <jose.exposito89@xxxxxxxxx> > > > > > > Add a couple of Rust const functions and macros to allow to develop > > > KUnit tests without relying on generated C code: > > > > > > - The `kunit_unsafe_test_suite!` Rust macro is similar to the > > > `kunit_test_suite` C macro. It requires a NULL-terminated array of > > > test cases (see below). > > > - The `kunit_case` Rust function is similar to the `KUNIT_CASE` C macro. > > > It generates as case from the name and function. > > > - The `kunit_case_null` Rust function generates a NULL test case, which > > > is to be used as delimiter in `kunit_test_suite!`. > > > > > > While these functions and macros can be used on their own, a future > > > patch will introduce another macro to create KUnit tests using a > > > user-space like syntax. > > > > > > Signed-off-by: José Expósito <jose.exposito89@xxxxxxxxx> > > > Co-developed-by: Matt Gilbride <mattgilbride@xxxxxxxxxx> > > > Signed-off-by: Matt Gilbride <mattgilbride@xxxxxxxxxx> > > > Co-developed-by: David Gow <davidgow@xxxxxxxxxx> > > > Signed-off-by: David Gow <davidgow@xxxxxxxxxx> > > > --- > > > > > > Changes since v1: > > > https://lore.kernel.org/lkml/20230720-rustbind-v1-1-c80db349e3b5@xxxxxxxxxx/ > > > - Rebase on top of rust-next > > > - As a result, KUnit attributes are new set. These are hardcoded to the > > > defaults of "normal" speed and no module name. > > > - Split the kunit_case!() macro into two const functions, kunit_case() > > > and kunit_case_null() (for the NULL terminator). > > > > > > --- > > > rust/kernel/kunit.rs | 108 +++++++++++++++++++++++++++++++++++++++++++ > > > rust/kernel/lib.rs | 1 + > > > 2 files changed, 109 insertions(+) > > > > > > diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs > > > index 824da0e9738a..fc2d259db458 100644 > > > --- a/rust/kernel/kunit.rs > > > +++ b/rust/kernel/kunit.rs > > > @@ -161,3 +161,111 @@ macro_rules! kunit_assert_eq { > > > $crate::kunit_assert!($name, $file, $diff, $left == $right); > > > }}; > > > } > > > + > > > +/// Represents an individual test case. > > > +/// > > > +/// The test case should have the signature > > > +/// `unsafe extern "C" fn test_case(test: *mut crate::bindings::kunit)`. > > > +/// > > > +/// The `kunit_unsafe_test_suite!` macro expects a NULL-terminated list of test cases. > > > +/// Use `kunit_case_null` to generate such a delimeter. > > > +const fn kunit_case(name: &kernel::str::CStr, run_case: unsafe extern "C" fn(*mut kernel::bindings::kunit)) -> kernel::bindings::kunit_case { > > > > This should probably say `name: &'static CStr` to require that the > > name lives forever. > > Fixed in v3, thanks. > > > > +/// Registers a KUnit test suite. > > > +/// > > > +/// # Safety > > > +/// > > > +/// `test_cases` must be a NULL terminated array of test cases. > > > +/// > > > +/// # Examples > > > +/// > > > +/// ```ignore > > > +/// unsafe extern "C" fn test_fn(_test: *mut crate::bindings::kunit) { > > > +/// let actual = 1 + 1; > > > +/// let expected = 2; > > > +/// assert_eq!(actual, expected); > > > +/// } > > > +/// > > > +/// static mut KUNIT_TEST_CASE: crate::bindings::kunit_case = crate::kunit_case(name, test_fn); > > > +/// static mut KUNIT_NULL_CASE: crate::bindings::kunit_case = crate::kunit_case_null(); > > > +/// static mut KUNIT_TEST_CASES: &mut[crate::bindings::kunit_case] = unsafe { > > > +/// &mut[KUNIT_TEST_CASE, KUNIT_NULL_CASE] > > > +/// }; > > > +/// crate::kunit_unsafe_test_suite!(suite_name, KUNIT_TEST_CASES); > > > +/// ``` > > > +#[macro_export] > > > +macro_rules! kunit_unsafe_test_suite { > > > + ($name:ident, $test_cases:ident) => { > > > + const _: () = { > > > + static KUNIT_TEST_SUITE_NAME: [i8; 256] = { > > > + let name_u8 = core::stringify!($name).as_bytes(); > > > + let mut ret = [0; 256]; > > > + > > > + let mut i = 0; > > > + while i < name_u8.len() { > > > + ret[i] = name_u8[i] as i8; > > > + i += 1; > > > + } > > > > I assume the name must be zero-terminated? If so, you probably need to > > enforce that somehow, e.g. by failing if `name_u8` is longer than 255 > > bytes. > > Nice catch. I'm not sure how to nicely throw a compile time error in > this function, so I'm truncating it here and doing a compile error in > the macro in patch #2. This isn't ideal, but seems to work. You should be able to just panic! if it happens. Also, I believe it should be i < 255 instead of 256? Alice
