src/test/run-pass/struct-return.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 no libc to test ffi with
  12
  13 #[repr(C)]
  14 #[derive(Copy, Clone)]
  15 pub struct Quad { a: u64, b: u64, c: u64, d: u64 }
  16
  17 #[repr(C)]
  18 #[derive(Copy, Clone)]
  19 pub struct Floats { a: f64, b: u8, c: f64 }
  20
  21 mod rustrt {
  22     use super::{Floats, Quad};
  23
  24     #[link(name = "rust_test_helpers", kind = "static")]
  25     extern {
  26         pub fn rust_dbg_abi_1(q: Quad) -> Quad;
  27         pub fn rust_dbg_abi_2(f: Floats) -> Floats;
  28     }
  29 }
  30
  31 fn test1() {
  32     unsafe {
  33         let q = Quad { a: 0xaaaa_aaaa_aaaa_aaaa,
  34                  b: 0xbbbb_bbbb_bbbb_bbbb,
  35                  c: 0xcccc_cccc_cccc_cccc,
  36                  d: 0xdddd_dddd_dddd_dddd };
  37         let qq = rustrt::rust_dbg_abi_1(q);
  38         println!("a: {:x}", qq.a as usize);
  39         println!("b: {:x}", qq.b as usize);
  40         println!("c: {:x}", qq.c as usize);
  41         println!("d: {:x}", qq.d as usize);
  42         assert_eq!(qq.a, q.c + 1);
  43         assert_eq!(qq.b, q.d - 1);
  44         assert_eq!(qq.c, q.a + 1);
  45         assert_eq!(qq.d, q.b - 1);
  46     }
  47 }
  48
  49 #[cfg(target_pointer_width = "64")]
  50 fn test2() {
  51     unsafe {
  52         let f = Floats { a: 1.234567890e-15_f64,
  53                  b: 0b_1010_1010,
  54                  c: 1.0987654321e-15_f64 };
  55         let ff = rustrt::rust_dbg_abi_2(f);
  56         println!("a: {}", ff.a as f64);
  57         println!("b: {}", ff.b as usize);
  58         println!("c: {}", ff.c as f64);
  59         assert_eq!(ff.a, f.c + 1.0f64);
  60         assert_eq!(ff.b, 0xff);
  61         assert_eq!(ff.c, f.a - 1.0f64);
  62     }
  63 }
  64
  65 #[cfg(target_pointer_width = "32")]
  66 fn test2() {
  67 }
  68
  69 pub fn main() {
  70     test1();
  71     test2();
  72 }