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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:19:03 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-17 12:19:03 +0000
commit64d98f8ee037282c35007b64c2649055c56af1db (patch)
tree5492bcf97fce41ee1c0b1cc2add283f3e66cdab0 /tests/ui/structs-enums/align-enum.rs
parentAdding debian version 1.67.1+dfsg1-1. (diff)
downloadrustc-64d98f8ee037282c35007b64c2649055c56af1db.tar.xz
rustc-64d98f8ee037282c35007b64c2649055c56af1db.zip
Merging upstream version 1.68.2+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/ui/structs-enums/align-enum.rs')
-rw-r--r--tests/ui/structs-enums/align-enum.rs54
1 files changed, 54 insertions, 0 deletions
diff --git a/tests/ui/structs-enums/align-enum.rs b/tests/ui/structs-enums/align-enum.rs
new file mode 100644
index 000000000..fa872caa3
--- /dev/null
+++ b/tests/ui/structs-enums/align-enum.rs
@@ -0,0 +1,54 @@
+// run-pass
+#![allow(dead_code)]
+
+use std::mem;
+
+// Raising alignment
+#[repr(align(16))]
+enum Align16 {
+ Foo { foo: u32 },
+ Bar { bar: u32 },
+}
+
+// Raise alignment by maximum
+#[repr(align(1), align(16))]
+#[repr(align(32))]
+#[repr(align(4))]
+enum Align32 {
+ Foo,
+ Bar,
+}
+
+// Not reducing alignment
+#[repr(align(4))]
+enum AlsoAlign16 {
+ Foo { limb_with_align16: Align16 },
+ Bar,
+}
+
+// No niche for discriminant when used as limb
+#[repr(align(16))]
+struct NoNiche16(u64, u64);
+
+// Discriminant will require extra space, but enum needs to stay compatible
+// with alignment 16
+#[repr(align(1))]
+enum AnotherAlign16 {
+ Foo { limb_with_noniche16: NoNiche16 },
+ Bar,
+ Baz,
+}
+
+fn main() {
+ assert_eq!(mem::align_of::<Align16>(), 16);
+ assert_eq!(mem::size_of::<Align16>(), 16);
+
+ assert_eq!(mem::align_of::<Align32>(), 32);
+ assert_eq!(mem::size_of::<Align32>(), 32);
+
+ assert_eq!(mem::align_of::<AlsoAlign16>(), 16);
+ assert_eq!(mem::size_of::<AlsoAlign16>(), 16);
+
+ assert_eq!(mem::align_of::<AnotherAlign16>(), 16);
+ assert_eq!(mem::size_of::<AnotherAlign16>(), 32);
+}