src/test/run-pass/structs-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 { a: u64, b: u64, c: u64, d: u64 }
   8
   9 #[repr(C)]
  10 #[derive(Copy, Clone)]
  11 pub struct Floats { a: f64, b: u8, c: f64 }
  12
  13 mod rustrt {
  14     use super::{Floats, Quad};
  15
  16     #[link(name = "rust_test_helpers", kind = "static")]
  17     extern {
  18         pub fn rust_dbg_abi_1(q: Quad) -> Quad;
  19         pub fn rust_dbg_abi_2(f: Floats) -> Floats;
  20     }
  21 }
  22
  23 fn test1() {
  24     unsafe {
  25         let q = Quad { a: 0xaaaa_aaaa_aaaa_aaaa,
  26                  b: 0xbbbb_bbbb_bbbb_bbbb,
  27                  c: 0xcccc_cccc_cccc_cccc,
  28                  d: 0xdddd_dddd_dddd_dddd };
  29         let qq = rustrt::rust_dbg_abi_1(q);
  30         println!("a: {:x}", qq.a as usize);
  31         println!("b: {:x}", qq.b as usize);
  32         println!("c: {:x}", qq.c as usize);
  33         println!("d: {:x}", qq.d as usize);
  34         assert_eq!(qq.a, q.c + 1);
  35         assert_eq!(qq.b, q.d - 1);
  36         assert_eq!(qq.c, q.a + 1);
  37         assert_eq!(qq.d, q.b - 1);
  38     }
  39 }
  40
  41 #[cfg(target_pointer_width = "64")]
  42 fn test2() {
  43     unsafe {
  44         let f = Floats { a: 1.234567890e-15_f64,
  45                  b: 0b_1010_1010,
  46                  c: 1.0987654321e-15_f64 };
  47         let ff = rustrt::rust_dbg_abi_2(f);
  48         println!("a: {}", ff.a as f64);
  49         println!("b: {}", ff.b as usize);
  50         println!("c: {}", ff.c as f64);
  51         assert_eq!(ff.a, f.c + 1.0f64);
  52         assert_eq!(ff.b, 0xff);
  53         assert_eq!(ff.c, f.a - 1.0f64);
  54     }
  55 }
  56
  57 #[cfg(target_pointer_width = "32")]
  58 fn test2() {
  59 }
  60
  61 pub fn main() {
  62     test1();
  63     test2();
  64 }