55 lines
1.5 KiB
Rust
55 lines
1.5 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(asm)]
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type History = Vec<&'static str>;
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fn wrap<A>(x:A, which: &'static str, history: &mut History) -> A {
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history.push(which);
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x
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}
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macro_rules! demo {
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( $output_constraint:tt ) => {
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{
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let mut x: int = 0;
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let y: int = 1;
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let mut history: History = vec!();
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unsafe {
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asm!("mov ($1), $0"
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: $output_constraint (*wrap(&mut x, "out", &mut history))
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: "r"(&wrap(y, "in", &mut history)));
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}
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assert_eq!((x,y), (1,1));
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let b: &[_] = &["out", "in"];
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assert_eq!(history, b);
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}
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}
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}
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#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
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fn main() {
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fn out_write_only_expr_then_in_expr() {
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demo!("=r")
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}
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fn out_read_write_expr_then_in_expr() {
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demo!("+r")
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}
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out_write_only_expr_then_in_expr();
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out_read_write_expr_then_in_expr();
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}
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#[cfg(all(not(target_arch = "x86"), not(target_arch = "x86_64")))]
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pub fn main() {}
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