Imported Upstream version 1.1.0+dfsg1

[rustc.git] / src / test / run-pass / out-of-stack.rs

// 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 <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.

// ignore-android: FIXME (#20004)
// ignore-musl

#![feature(asm)]

use std::process::Command;
use std::env;

// lifted from the test module
// Inlining to avoid llvm turning the recursive functions into tail calls,
// which doesn't consume stack.
#[inline(always)]
pub fn black_box<T>(dummy: T) { unsafe { asm!("" : : "r"(&dummy)) } }

fn silent_recurse() {
    let buf = [0; 1000];
    black_box(buf);
    silent_recurse();
}

fn loud_recurse() {
    println!("hello!");
    loud_recurse();
    black_box(()); // don't optimize this into a tail call. please.
}

fn main() {
    let args: Vec<String> = env::args().collect();
    if args.len() > 1 && args[1] == "silent" {
        silent_recurse();
    } else if args.len() > 1 && args[1] == "loud" {
        loud_recurse();
    } else {
        let silent = Command::new(&args[0]).arg("silent").output().unwrap();
        assert!(!silent.status.success());
        let error = String::from_utf8_lossy(&silent.stderr);
        assert!(error.contains("has overflowed its stack"));

        let loud = Command::new(&args[0]).arg("loud").output().unwrap();
        assert!(!loud.status.success());
        let error = String::from_utf8_lossy(&silent.stderr);
        assert!(error.contains("has overflowed its stack"));
    }
}