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 // ignore-wasm32-bare seems unimportant to test
  12
  13 // Issue #2303
  14
  15 #![feature(intrinsics)]
  16
  17 use std::mem;
  18
  19 mod rusti {
  20     extern "rust-intrinsic" {
  21         pub fn pref_align_of<T>() -> usize;
  22         pub fn min_align_of<T>() -> usize;
  23     }
  24 }
  25
  26 // This is the type with the questionable alignment
  27 #[derive(Debug)]
  28 struct Inner {
  29     c64: u64
  30 }
  31
  32 // This is the type that contains the type with the
  33 // questionable alignment, for testing
  34 #[derive(Debug)]
  35 struct Outer {
  36     c8: u8,
  37     t: Inner
  38 }
  39
  40
  41 #[cfg(any(target_os = "linux",
  42           target_os = "macos",
  43           target_os = "freebsd",
  44           target_os = "dragonfly",
  45           target_os = "netbsd",
  46           target_os = "openbsd",
  47           target_os = "solaris",
  48           target_os = "emscripten"))]
  49 mod m {
  50     #[cfg(target_arch = "x86")]
  51     pub mod m {
  52         pub fn align() -> usize { 4 }
  53         pub fn size() -> usize { 12 }
  54     }
  55
  56     #[cfg(not(target_arch = "x86"))]
  57     pub mod m {
  58         pub fn align() -> usize { 8 }
  59         pub fn size() -> usize { 16 }
  60     }
  61 }
  62
  63 #[cfg(target_os = "bitrig")]
  64 mod m {
  65     #[cfg(target_arch = "x86_64")]
  66     pub mod m {
  67         pub fn align() -> usize { 8 }
  68         pub fn size() -> usize { 16 }
  69     }
  70 }
  71
  72 #[cfg(target_os = "windows")]
  73 mod m {
  74     #[cfg(target_arch = "x86")]
  75     pub mod m {
  76         pub fn align() -> usize { 8 }
  77         pub fn size() -> usize { 16 }
  78     }
  79
  80     #[cfg(target_arch = "x86_64")]
  81     pub mod m {
  82         pub fn align() -> usize { 8 }
  83         pub fn size() -> usize { 16 }
  84     }
  85 }
  86
  87 #[cfg(target_os = "android")]
  88 mod m {
  89     #[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
  90     pub mod m {
  91         pub fn align() -> usize { 8 }
  92         pub fn size() -> usize { 16 }
  93     }
  94 }
  95
  96 pub fn main() {
  97     unsafe {
  98         let x = Outer {c8: 22, t: Inner {c64: 44}};
  99
 100         let y = format!("{:?}", x);
 101
 102         println!("align inner = {:?}", rusti::min_align_of::<Inner>());
 103         println!("size outer = {:?}", mem::size_of::<Outer>());
 104         println!("y = {:?}", y);
 105
 106         // per clang/gcc the alignment of `Inner` is 4 on x86.
 107         assert_eq!(rusti::min_align_of::<Inner>(), m::m::align());
 108
 109         // per clang/gcc the size of `Outer` should be 12
 110         // because `Inner`s alignment was 4.
 111         assert_eq!(mem::size_of::<Outer>(), m::m::size());
 112
 113         assert_eq!(y, "Outer { c8: 22, t: Inner { c64: 44 } }".to_string());
 114     }
 115 }