// Copyright 2012-2014 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 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. #![feature(asm)] type History = Vec<&'static str>; fn wrap(x:A, which: &'static str, history: &mut History) -> A { history.push(which); x } macro_rules! demo { ( $output_constraint:tt ) => { { let mut x: int = 0; let y: int = 1; let mut history: History = vec!(); unsafe { asm!("mov ($1), $0" : $output_constraint (*wrap(&mut x, "out", &mut history)) : "r"(&wrap(y, "in", &mut history))); } assert_eq!((x,y), (1,1)); let b: &[_] = &["out", "in"]; assert_eq!(history, b); } } } #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] fn main() { fn out_write_only_expr_then_in_expr() { demo!("=r") } fn out_read_write_expr_then_in_expr() { demo!("+r") } out_write_only_expr_then_in_expr(); out_read_write_expr_then_in_expr(); } #[cfg(all(not(target_arch = "x86"), not(target_arch = "x86_64")))] pub fn main() {}