58 lines
1.3 KiB
Rust
58 lines
1.3 KiB
Rust
// run-pass
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#![allow(dead_code)]
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#![allow(unused_unsafe)]
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// Issue #2303
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#![feature(intrinsics)]
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use std::mem;
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mod rusti {
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extern "rust-intrinsic" {
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pub fn pref_align_of<T>() -> usize;
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#[rustc_safe_intrinsic]
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pub fn min_align_of<T>() -> usize;
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}
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}
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// This is the type with the questionable alignment
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#[derive(Debug)]
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struct Inner {
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c64: u32
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}
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// This is the type that contains the type with the
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// questionable alignment, for testing
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#[derive(Debug)]
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struct Outer {
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c8: u8,
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t: Inner
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}
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mod m {
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pub fn align() -> usize { 4 }
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pub fn size() -> usize { 8 }
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}
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pub fn main() {
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unsafe {
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let x = Outer {c8: 22, t: Inner {c64: 44}};
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// Send it through the shape code
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let y = format!("{:?}", x);
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println!("align inner = {:?}", rusti::min_align_of::<Inner>());
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println!("size outer = {:?}", mem::size_of::<Outer>());
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println!("y = {:?}", y);
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// per clang/gcc the alignment of `inner` is 4 on x86.
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assert_eq!(rusti::min_align_of::<Inner>(), m::align());
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// per clang/gcc the size of `outer` should be 12
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// because `inner`s alignment was 4.
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assert_eq!(mem::size_of::<Outer>(), m::size());
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assert_eq!(y, "Outer { c8: 22, t: Inner { c64: 44 } }".to_string());
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}
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}
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