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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.
#[macro_escape];
#[doc(hidden)];
macro_rules! rterrln (
($( $arg:expr),+) => ( {
::rt::util::dumb_println(fmt!( $($arg),+ ));
} )
)
// Some basic logging. Enabled by passing `--cfg rtdebug` to the libstd build.
macro_rules! rtdebug (
($( $arg:expr),+) => ( {
if cfg!(rtdebug) {
rterrln!( $($arg),+ )
}
})
)
macro_rules! rtassert (
( $arg:expr ) => ( {
if ::rt::util::ENFORCE_SANITY {
if !$arg {
rtabort!("assertion failed: %s", stringify!($arg));
}
}
} )
)
macro_rules! rtabort(
($( $msg:expr),+) => ( {
::rt::util::abort(fmt!($($msg),+));
} )
)
macro_rules! assert_once_ever(
($( $msg:expr),+) => ( {
// FIXME(#8472) extra function should not be needed to hide unsafe
fn assert_once_ever() {
unsafe {
static mut already_happened: int = 0;
// Double-check lock to avoid a swap in the common case.
if already_happened != 0 ||
::unstable::intrinsics::atomic_xchg_relaxed(&mut already_happened, 1) != 0 {
fail!(fmt!("assert_once_ever happened twice: %s", fmt!($($msg),+)));
}
}
}
assert_once_ever();
} )
)
#[cfg(test)]
mod tests {
#[test]
fn test_assert_once_ever_ok() {
assert_once_ever!("help i'm stuck in an");
assert_once_ever!("assertion error message");
}
#[test] #[ignore(cfg(windows))] #[should_fail]
fn test_assert_once_ever_fail() {
use task;
fn f() { assert_once_ever!("if you're seeing this... good!") }
// linked & watched, naturally
task::spawn(f);
task::spawn(f);
}
}
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