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 = "netbsd",
  44           target_os = "openbsd",
  45           target_os = "solaris",
  46           target_os = "emscripten"))]
  47 mod m {
  48     #[cfg(target_arch = "x86")]
  49     pub mod m {
  50         pub fn align() -> usize { 4 }
  51         pub fn size() -> usize { 12 }
  52     }
  53
  54     #[cfg(not(target_arch = "x86"))]
  55     pub mod m {
  56         pub fn align() -> usize { 8 }
  57         pub fn size() -> usize { 16 }
  58     }
  59 }
  60
  61 #[cfg(target_os = "bitrig")]
  62 mod m {
  63     #[cfg(target_arch = "x86_64")]
  64     pub mod m {
  65         pub fn align() -> usize { 8 }
  66         pub fn size() -> usize { 16 }
  67     }
  68 }
  69
  70 #[cfg(target_os = "windows")]
  71 mod m {
  72     #[cfg(target_arch = "x86")]
  73     pub mod m {
  74         pub fn align() -> usize { 8 }
  75         pub fn size() -> usize { 16 }
  76     }
  77
  78     #[cfg(target_arch = "x86_64")]
  79     pub mod m {
  80         pub fn align() -> usize { 8 }
  81         pub fn size() -> usize { 16 }
  82     }
  83 }
  84
  85 #[cfg(target_os = "android")]
  86 mod m {
  87     #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
  88     pub mod m {
  89         pub fn align() -> usize { 8 }
  90         pub fn size() -> usize { 16 }
  91     }
  92 }
  93
  94 pub fn main() {
  95     unsafe {
  96         let x = Outer {c8: 22, t: Inner {c64: 44}};
  97
  98         let y = format!("{:?}", x);
  99
 100         println!("align inner = {:?}", rusti::min_align_of::<Inner>());
 101         println!("size outer = {:?}", mem::size_of::<Outer>());
 102         println!("y = {:?}", y);
 103
 104         // per clang/gcc the alignment of `Inner` is 4 on x86.
 105         assert_eq!(rusti::min_align_of::<Inner>(), m::m::align());
 106
 107         // per clang/gcc the size of `Outer` should be 12
 108         // because `Inner`s alignment was 4.
 109         assert_eq!(mem::size_of::<Outer>(), m::m::size());
 110
 111         assert_eq!(y, "Outer { c8: 22, t: Inner { c64: 44 } }".to_string());
 112     }
 113 }