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// run-pass
#![allow(unused_must_use)]
#![allow(unconditional_recursion)]
// ignore-android: FIXME (#20004)
// ignore-emscripten no processes
// ignore-sgx no processes
// ignore-fuchsia must translate zircon signal to SIGABRT, FIXME (#58590)
// ignore-nto no stack overflow handler used (no alternate stack available)
#![feature(core_intrinsics)]
#![feature(rustc_private)]
#[cfg(unix)]
extern crate libc;
use std::env;
use std::process::Command;
use std::thread;
// 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) { std::intrinsics::black_box(dummy); }
fn silent_recurse() {
let buf = [0u8; 1000];
black_box(buf);
silent_recurse();
}
fn loud_recurse() {
println!("hello!");
loud_recurse();
black_box(()); // don't optimize this into a tail call. please.
}
#[cfg(unix)]
fn check_status(status: std::process::ExitStatus)
{
use std::os::unix::process::ExitStatusExt;
assert!(!status.success());
assert_eq!(status.signal(), Some(libc::SIGABRT));
}
#[cfg(not(unix))]
fn check_status(status: std::process::ExitStatus)
{
assert!(!status.success());
}
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 if args.len() > 1 && args[1] == "silent-thread" {
thread::spawn(silent_recurse).join();
} else if args.len() > 1 && args[1] == "loud-thread" {
thread::spawn(loud_recurse).join();
} else {
let mut modes = vec![
"silent-thread",
"loud-thread",
];
// On linux it looks like the main thread can sometimes grow its stack
// basically without bounds, so we only test the child thread cases
// there.
if !cfg!(target_os = "linux") {
modes.push("silent");
modes.push("loud");
}
for mode in modes {
println!("testing: {}", mode);
let silent = Command::new(&args[0]).arg(mode).output().unwrap();
check_status(silent.status);
let error = String::from_utf8_lossy(&silent.stderr);
assert!(error.contains("has overflowed its stack"),
"missing overflow message: {}", error);
}
}
}
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