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-rw-r--r--tests/ui/structs-enums/rec-align-u32.rs57
1 files changed, 57 insertions, 0 deletions
diff --git a/tests/ui/structs-enums/rec-align-u32.rs b/tests/ui/structs-enums/rec-align-u32.rs
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+++ b/tests/ui/structs-enums/rec-align-u32.rs
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+// run-pass
+#![allow(dead_code)]
+#![allow(unused_unsafe)]
+// Issue #2303
+
+#![feature(intrinsics)]
+
+use std::mem;
+
+mod rusti {
+ extern "rust-intrinsic" {
+ pub fn pref_align_of<T>() -> usize;
+ #[rustc_safe_intrinsic]
+ pub fn min_align_of<T>() -> usize;
+ }
+}
+
+// This is the type with the questionable alignment
+#[derive(Debug)]
+struct Inner {
+ c64: u32
+}
+
+// This is the type that contains the type with the
+// questionable alignment, for testing
+#[derive(Debug)]
+struct Outer {
+ c8: u8,
+ t: Inner
+}
+
+mod m {
+ pub fn align() -> usize { 4 }
+ pub fn size() -> usize { 8 }
+}
+
+pub fn main() {
+ unsafe {
+ let x = Outer {c8: 22, t: Inner {c64: 44}};
+
+ // Send it through the shape code
+ let y = format!("{:?}", x);
+
+ println!("align inner = {:?}", rusti::min_align_of::<Inner>());
+ println!("size outer = {:?}", mem::size_of::<Outer>());
+ println!("y = {:?}", y);
+
+ // per clang/gcc the alignment of `inner` is 4 on x86.
+ assert_eq!(rusti::min_align_of::<Inner>(), m::align());
+
+ // per clang/gcc the size of `outer` should be 12
+ // because `inner`s alignment was 4.
+ assert_eq!(mem::size_of::<Outer>(), m::size());
+
+ assert_eq!(y, "Outer { c8: 22, t: Inner { c64: 44 } }".to_string());
+ }
+}