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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/monomorphize-abi-alignment.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/monomorphize-abi-alignment.rs')
-rw-r--r-- | src/test/ui/monomorphize-abi-alignment.rs | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/monomorphize-abi-alignment.rs b/src/test/ui/monomorphize-abi-alignment.rs new file mode 100644 index 000000000..a8d8bd1d5 --- /dev/null +++ b/src/test/ui/monomorphize-abi-alignment.rs @@ -0,0 +1,35 @@ +// run-pass + +#![allow(non_upper_case_globals)] +#![allow(dead_code)] +/*! + * On x86_64-linux-gnu and possibly other platforms, structs get 8-byte "preferred" alignment, + * but their "ABI" alignment (i.e., what actually matters for data layout) is the largest alignment + * of any field. (Also, `u64` has 8-byte ABI alignment; this is not always true). + * + * On such platforms, if monomorphize uses the "preferred" alignment, then it will unify + * `A` and `B`, even though `S<A>` and `S<B>` have the field `t` at different offsets, + * and apply the wrong instance of the method `unwrap`. + */ + +#[derive(Copy, Clone)] +struct S<T> { i:u8, t:T } + +impl<T> S<T> { + fn unwrap(self) -> T { + self.t + } +} + +#[derive(Copy, Clone, PartialEq, Debug)] +struct A((u32, u32)); + +#[derive(Copy, Clone, PartialEq, Debug)] +struct B(u64); + +pub fn main() { + static Ca: S<A> = S { i: 0, t: A((13, 104)) }; + static Cb: S<B> = S { i: 0, t: B(31337) }; + assert_eq!(Ca.unwrap(), A((13, 104))); + assert_eq!(Cb.unwrap(), B(31337)); +} |