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// run-pass
#![allow(unused_must_use)]
// This time we're testing repeatedly going up and down both stacks to
// make sure the stack pointers are maintained properly in both
// directions
// ignore-emscripten no threads support
#![feature(rustc_private)]
extern crate libc;
use std::thread;
mod rustrt {
extern crate libc;
#[link(name = "rust_test_helpers", kind = "static")]
extern "C" {
pub fn rust_dbg_call(
cb: extern "C" fn(libc::uintptr_t) -> libc::uintptr_t,
data: libc::uintptr_t,
) -> libc::uintptr_t;
}
}
extern "C" fn cb(data: libc::uintptr_t) -> libc::uintptr_t {
if data == 1 { data } else { count(data - 1) + count(data - 1) }
}
fn count(n: libc::uintptr_t) -> libc::uintptr_t {
unsafe {
println!("n = {}", n);
rustrt::rust_dbg_call(cb, n)
}
}
pub fn main() {
// Make sure we're on a thread with small Rust stacks (main currently
// has a large stack)
thread::spawn(move || {
let result = count(12);
println!("result = {}", result);
assert_eq!(result, 2048);
})
.join();
}
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