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