diff options
Diffstat (limited to 'src/test/ui/packed/packed-struct-optimized-enum.rs')
-rw-r--r-- | src/test/ui/packed/packed-struct-optimized-enum.rs | 36 |
1 files changed, 0 insertions, 36 deletions
diff --git a/src/test/ui/packed/packed-struct-optimized-enum.rs b/src/test/ui/packed/packed-struct-optimized-enum.rs deleted file mode 100644 index 5e1a1f518..000000000 --- a/src/test/ui/packed/packed-struct-optimized-enum.rs +++ /dev/null @@ -1,36 +0,0 @@ -// run-pass -#[repr(packed)] -struct Packed<T: Copy>(#[allow(unused_tuple_struct_fields)] T); - -impl<T: Copy> Copy for Packed<T> {} -impl<T: Copy> Clone for Packed<T> { - fn clone(&self) -> Self { *self } -} - -fn sanity_check_size<T: Copy>(one: T) { - let two = [one, one]; - let stride = (&two[1] as *const _ as usize) - (&two[0] as *const _ as usize); - let (size, align) = (std::mem::size_of::<T>(), std::mem::align_of::<T>()); - assert_eq!(stride, size); - assert_eq!(size % align, 0); -} - -fn main() { - // This can fail if rustc and LLVM disagree on the size of a type. - // In this case, `Option<Packed<(&(), u32)>>` was erroneously not - // marked as packed despite needing alignment `1` and containing - // its `&()` discriminant, which has alignment larger than `1`. - sanity_check_size((Some(Packed((&(), 0))), true)); - - // In #46769, `Option<(Packed<&()>, bool)>` was found to have - // pointer alignment, without actually being aligned in size. - // e.g., on 64-bit platforms, it had alignment `8` but size `9`. - type PackedRefAndBool<'a> = (Packed<&'a ()>, bool); - sanity_check_size::<Option<PackedRefAndBool>>(Some((Packed(&()), true))); - - // Make sure we don't pay for the enum optimization in size, - // e.g., we shouldn't need extra padding after the packed data. - assert_eq!(std::mem::align_of::<Option<PackedRefAndBool>>(), 1); - assert_eq!(std::mem::size_of::<Option<PackedRefAndBool>>(), - std::mem::size_of::<PackedRefAndBool>()); -} |