rust/src/test/run-pass/extern-call-scrub.rs

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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// This time we're testing repeatedly going up and down both stacks to
// make sure the stack pointers are maintained properly in both
// directions
mod rustrt {
pub extern {
pub fn rust_dbg_call(cb: *u8, data: libc::uintptr_t)
-> libc::uintptr_t;
}
}
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extern fn cb(data: libc::uintptr_t) -> libc::uintptr_t {
if data == 1u {
data
} else {
count(data - 1u) + count(data - 1u)
}
}
fn count(n: uint) -> uint {
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unsafe {
debug!("n = %?", n);
rustrt::rust_dbg_call(cb, n)
}
}
pub fn main() {
// Make sure we're on a task with small Rust stacks (main currently
// has a large stack)
do task::spawn {
let result = count(12u);
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debug!("result = %?", result);
assert result == 2048u;
};
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}