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//@ run-pass
#![feature(c_variadic)]
use std::ffi::VaList;
#[link(name = "rust_test_helpers", kind = "static")]
extern "C" {
fn rust_interesting_average(_: u64, ...) -> f64;
fn rust_valist_interesting_average(_: u64, _: VaList) -> f64;
}
pub unsafe extern "C" fn test_valist_forward(n: u64, mut ap: ...) -> f64 {
rust_valist_interesting_average(n, ap.as_va_list())
}
pub unsafe extern "C-unwind" fn c_unwind_can_forward(n: u64, mut ap: ...) -> f64 {
rust_valist_interesting_average(n, ap.as_va_list())
}
pub unsafe extern "C" fn test_va_copy(_: u64, mut ap: ...) {
let mut ap2 = ap.clone();
assert_eq!(rust_valist_interesting_average(2, ap2.as_va_list()) as i64, 30);
// Advance one pair in the copy before checking
let mut ap2 = ap.clone();
let _ = ap2.arg::<u64>();
let _ = ap2.arg::<f64>();
assert_eq!(rust_valist_interesting_average(2, ap2.as_va_list()) as i64, 50);
// Advance one pair in the original
let _ = ap.arg::<u64>();
let _ = ap.arg::<f64>();
let mut ap2 = ap.clone();
assert_eq!(rust_valist_interesting_average(2, ap2.as_va_list()) as i64, 50);
let mut ap2 = ap.clone();
let _ = ap2.arg::<u64>();
let _ = ap2.arg::<f64>();
assert_eq!(rust_valist_interesting_average(2, ap2.as_va_list()) as i64, 70);
}
pub fn main() {
// Call without variadic arguments
unsafe {
assert!(rust_interesting_average(0).is_nan());
}
// Call with direct arguments
unsafe {
assert_eq!(rust_interesting_average(1, 10i64, 10.0f64) as i64, 20);
}
// Call with named arguments, variable number of them
let (x1, x2, x3, x4) = (10i64, 10.0f64, 20i64, 20.0f64);
unsafe {
assert_eq!(rust_interesting_average(2, x1, x2, x3, x4) as i64, 30);
}
// A function that takes a function pointer
unsafe fn call(fp: unsafe extern "C" fn(u64, ...) -> f64) {
let (x1, x2, x3, x4) = (10i64, 10.0f64, 20i64, 20.0f64);
assert_eq!(fp(2, x1, x2, x3, x4) as i64, 30);
}
unsafe {
call(rust_interesting_average);
// Make a function pointer, pass indirectly
let x: unsafe extern "C" fn(u64, ...) -> f64 = rust_interesting_average;
call(x);
}
unsafe {
assert_eq!(test_valist_forward(2, 10i64, 10f64, 20i64, 20f64) as i64, 30);
}
unsafe {
assert_eq!(c_unwind_can_forward(2, 10i64, 10f64, 20i64, 20f64) as i64, 30);
}
unsafe {
test_va_copy(4, 10i64, 10f64, 20i64, 20f64, 30i64, 30f64, 40i64, 40f64);
}
}
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