tests/ui/abi/struct-enums/struct-return.rs

   1 // run-pass
   2 #![allow(dead_code)]
   3 // ignore-wasm32-bare no libc to test ffi with
   4
   5 #[repr(C)]
   6 #[derive(Copy, Clone)]
   7 pub struct Quad {
   8     a: u64,
   9     b: u64,
  10     c: u64,
  11     d: u64,
  12 }
  13
  14 #[repr(C)]
  15 #[derive(Copy, Clone)]
  16 pub struct Floats {
  17     a: f64,
  18     b: u8,
  19     c: f64,
  20 }
  21
  22 #[repr(C)]
  23 #[derive(Copy, Clone)]
  24 pub struct CharCharDouble {
  25     a: u8,
  26     b: u8,
  27     c: f64,
  28 }
  29
  30 #[repr(C)]
  31 #[derive(Copy, Clone)]
  32 pub struct CharCharFloat {
  33     a: u8,
  34     b: u8,
  35     c: f32,
  36 }
  37
  38 mod rustrt {
  39     use super::{CharCharDouble, CharCharFloat, Floats, Quad};
  40
  41     #[link(name = "rust_test_helpers", kind = "static")]
  42     extern "C" {
  43         pub fn rust_dbg_abi_1(q: Quad) -> Quad;
  44         pub fn rust_dbg_abi_2(f: Floats) -> Floats;
  45         pub fn rust_dbg_abi_3(a: CharCharDouble) -> CharCharDouble;
  46         pub fn rust_dbg_abi_4(a: CharCharFloat) -> CharCharFloat;
  47     }
  48 }
  49
  50 fn test1() {
  51     unsafe {
  52         let q = Quad {
  53             a: 0xaaaa_aaaa_aaaa_aaaa,
  54             b: 0xbbbb_bbbb_bbbb_bbbb,
  55             c: 0xcccc_cccc_cccc_cccc,
  56             d: 0xdddd_dddd_dddd_dddd,
  57         };
  58         let qq = rustrt::rust_dbg_abi_1(q);
  59         println!("a: {:x}", qq.a as usize);
  60         println!("b: {:x}", qq.b as usize);
  61         println!("c: {:x}", qq.c as usize);
  62         println!("d: {:x}", qq.d as usize);
  63         assert_eq!(qq.a, q.c + 1);
  64         assert_eq!(qq.b, q.d - 1);
  65         assert_eq!(qq.c, q.a + 1);
  66         assert_eq!(qq.d, q.b - 1);
  67     }
  68 }
  69
  70 #[cfg(target_pointer_width = "64")]
  71 fn test2() {
  72     unsafe {
  73         let f = Floats { a: 1.234567890e-15_f64, b: 0b_1010_1010, c: 1.0987654321e-15_f64 };
  74         let ff = rustrt::rust_dbg_abi_2(f);
  75         println!("a: {}", ff.a as f64);
  76         println!("b: {}", ff.b as usize);
  77         println!("c: {}", ff.c as f64);
  78         assert_eq!(ff.a, f.c + 1.0f64);
  79         assert_eq!(ff.b, 0xff);
  80         assert_eq!(ff.c, f.a - 1.0f64);
  81     }
  82 }
  83
  84 #[cfg(target_pointer_width = "32")]
  85 fn test2() {}
  86
  87 #[cfg(target_pointer_width = "64")]
  88 fn test3() {
  89     unsafe {
  90         let a = CharCharDouble { a: 1, b: 2, c: 3. };
  91         let b = rustrt::rust_dbg_abi_3(a);
  92         println!("a: {}", b.a);
  93         println!("b: {}", b.b);
  94         println!("c: {}", b.c);
  95         assert_eq!(b.a, a.a + 1);
  96         assert_eq!(b.b, a.b - 1);
  97         assert_eq!(b.c, a.c + 1.0);
  98     }
  99 }
 100
 101 #[cfg(target_pointer_width = "32")]
 102 fn test3() {}
 103
 104 fn test4() {
 105     unsafe {
 106         let a = CharCharFloat { a: 1, b: 2, c: 3. };
 107         let b = rustrt::rust_dbg_abi_4(a);
 108         println!("a: {}", b.a);
 109         println!("b: {}", b.b);
 110         println!("c: {}", b.c);
 111         assert_eq!(b.a, a.a + 1);
 112         assert_eq!(b.b, a.b - 1);
 113         assert_eq!(b.c, a.c + 1.0);
 114     }
 115 }
 116
 117 pub fn main() {
 118     test1();
 119     test2();
 120     test3();
 121     test4();
 122 }