src/test/run-pass/rec-align-u64.rs

   1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // Issue #2303
  12
  13 #![feature(intrinsics)]
  14
  15 use std::mem;
  16
  17 mod rusti {
  18     extern "rust-intrinsic" {
  19         pub fn pref_align_of<T>() -> usize;
  20         pub fn min_align_of<T>() -> usize;
  21     }
  22 }
  23
  24 // This is the type with the questionable alignment
  25 #[derive(Debug)]
  26 struct Inner {
  27     c64: u64
  28 }
  29
  30 // This is the type that contains the type with the
  31 // questionable alignment, for testing
  32 #[derive(Debug)]
  33 struct Outer {
  34     c8: u8,
  35     t: Inner
  36 }
  37
  38
  39 #[cfg(any(target_os = "linux",
  40           target_os = "macos",
  41           target_os = "freebsd",
  42           target_os = "dragonfly",
  43           target_os = "openbsd"))]
  44 mod m {
  45     #[cfg(target_arch = "x86")]
  46     pub mod m {
  47         pub fn align() -> usize { 4 }
  48         pub fn size() -> usize { 12 }
  49     }
  50
  51     #[cfg(any(target_arch = "x86_64", target_arch = "arm", target_arch = "aarch64"))]
  52     pub mod m {
  53         pub fn align() -> usize { 8 }
  54         pub fn size() -> usize { 16 }
  55     }
  56 }
  57
  58 #[cfg(target_os = "bitrig")]
  59 mod m {
  60     #[cfg(target_arch = "x86_64")]
  61     pub mod m {
  62         pub fn align() -> usize { 8 }
  63         pub fn size() -> usize { 16 }
  64     }
  65 }
  66
  67 #[cfg(target_os = "windows")]
  68 mod m {
  69     #[cfg(target_arch = "x86")]
  70     pub mod m {
  71         pub fn align() -> usize { 8 }
  72         pub fn size() -> usize { 16 }
  73     }
  74
  75     #[cfg(target_arch = "x86_64")]
  76     pub mod m {
  77         pub fn align() -> usize { 8 }
  78         pub fn size() -> usize { 16 }
  79     }
  80 }
  81
  82 #[cfg(target_os = "android")]
  83 mod m {
  84     #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
  85     pub mod m {
  86         pub fn align() -> usize { 8 }
  87         pub fn size() -> usize { 16 }
  88     }
  89 }
  90
  91 pub fn main() {
  92     unsafe {
  93         let x = Outer {c8: 22, t: Inner {c64: 44}};
  94
  95         let y = format!("{:?}", x);
  96
  97         println!("align inner = {:?}", rusti::min_align_of::<Inner>());
  98         println!("size outer = {:?}", mem::size_of::<Outer>());
  99         println!("y = {:?}", y);
 100
 101         // per clang/gcc the alignment of `Inner` is 4 on x86.
 102         assert_eq!(rusti::min_align_of::<Inner>(), m::m::align());
 103
 104         // per clang/gcc the size of `Outer` should be 12
 105         // because `Inner`s alignment was 4.
 106         assert_eq!(mem::size_of::<Outer>(), m::m::size());
 107
 108         assert_eq!(y, "Outer { c8: 22, t: Inner { c64: 44 } }".to_string());
 109     }
 110 }