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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/structs-enums/tag-align-dyn-variants.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/structs-enums/tag-align-dyn-variants.rs')
-rw-r--r-- | src/test/ui/structs-enums/tag-align-dyn-variants.rs | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/test/ui/structs-enums/tag-align-dyn-variants.rs b/src/test/ui/structs-enums/tag-align-dyn-variants.rs new file mode 100644 index 000000000..4d075b04c --- /dev/null +++ b/src/test/ui/structs-enums/tag-align-dyn-variants.rs @@ -0,0 +1,67 @@ +// run-pass +#![allow(dead_code)] +#![allow(deprecated)] +#![allow(non_snake_case)] + +use std::mem; + +enum Tag<A,B> { + VarA(A), + VarB(B), +} + +struct Rec<A,B> { + chA: u8, + tA: Tag<A,B>, + chB: u8, + tB: Tag<A,B>, +} + +fn mk_rec<A,B>(a: A, b: B) -> Rec<A,B> { + Rec { chA:0, tA:Tag::VarA(a), chB:1, tB:Tag::VarB(b) } +} + +fn is_aligned<A>(amnt: usize, u: &A) -> bool { + let p: usize = unsafe { mem::transmute(u) }; + return (p & (amnt-1)) == 0; +} + +fn variant_data_is_aligned<A,B>(amnt: usize, u: &Tag<A,B>) -> bool { + match u { + &Tag::VarA(ref a) => is_aligned(amnt, a), + &Tag::VarB(ref b) => is_aligned(amnt, b) + } +} + +pub fn main() { + let u64_align = std::mem::min_align_of::<u64>(); + let x = mk_rec(22u64, 23u64); + assert!(is_aligned(u64_align, &x.tA)); + assert!(variant_data_is_aligned(u64_align, &x.tA)); + assert!(is_aligned(u64_align, &x.tB)); + assert!(variant_data_is_aligned(u64_align, &x.tB)); + + let x = mk_rec(22u64, 23u32); + assert!(is_aligned(u64_align, &x.tA)); + assert!(variant_data_is_aligned(u64_align, &x.tA)); + assert!(is_aligned(u64_align, &x.tB)); + assert!(variant_data_is_aligned(4, &x.tB)); + + let x = mk_rec(22u32, 23u64); + assert!(is_aligned(u64_align, &x.tA)); + assert!(variant_data_is_aligned(4, &x.tA)); + assert!(is_aligned(u64_align, &x.tB)); + assert!(variant_data_is_aligned(u64_align, &x.tB)); + + let x = mk_rec(22u32, 23u32); + assert!(is_aligned(4, &x.tA)); + assert!(variant_data_is_aligned(4, &x.tA)); + assert!(is_aligned(4, &x.tB)); + assert!(variant_data_is_aligned(4, &x.tB)); + + let x = mk_rec(22f64, 23f64); + assert!(is_aligned(u64_align, &x.tA)); + assert!(variant_data_is_aligned(u64_align, &x.tA)); + assert!(is_aligned(u64_align, &x.tB)); + assert!(variant_data_is_aligned(u64_align, &x.tB)); +} |