107 lines
3.5 KiB
Rust
107 lines
3.5 KiB
Rust
// This is a test which attempts to blow out the system limit with how many
|
|
// arguments can be passed to a process. This'll successively call rustc with
|
|
// larger and larger argument lists in an attempt to find one that's way too
|
|
// big for the system at hand. This file itself is then used as a "linker" to
|
|
// detect when the process creation succeeds.
|
|
//
|
|
// Eventually we should see an argument that looks like `@` as we switch from
|
|
// passing literal arguments to passing everything in the file.
|
|
|
|
use std::collections::HashSet;
|
|
use std::env;
|
|
use std::fs::{self, File};
|
|
use std::io::{BufWriter, Write};
|
|
use std::path::{Path, PathBuf};
|
|
use std::process::Command;
|
|
|
|
fn write_test_case(file: &Path, n: usize) -> HashSet<String> {
|
|
let mut libs = HashSet::new();
|
|
let mut f = BufWriter::new(File::create(&file).unwrap());
|
|
let mut prefix = String::new();
|
|
for _ in 0..n {
|
|
prefix.push_str("foo");
|
|
}
|
|
for i in 0..n {
|
|
writeln!(f, "#[link(name = \"S{}{}S\")]", prefix, i).unwrap();
|
|
libs.insert(format!("{}{}", prefix, i));
|
|
}
|
|
writeln!(f, "extern \"C\" {{}}\nfn main() {{}}").unwrap();
|
|
f.into_inner().unwrap();
|
|
|
|
libs
|
|
}
|
|
|
|
fn read_linker_args(path: &Path) -> String {
|
|
let contents = fs::read(path).unwrap();
|
|
if cfg!(target_env = "msvc") {
|
|
let mut i = contents.chunks(2).map(|c| {
|
|
c[0] as u16 | ((c[1] as u16) << 8)
|
|
});
|
|
assert_eq!(i.next(), Some(0xfeff), "Expected UTF-16 BOM");
|
|
String::from_utf16(&i.collect::<Vec<u16>>()).unwrap()
|
|
} else {
|
|
String::from_utf8(contents).unwrap()
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let tmpdir = PathBuf::from(env::var_os("TMPDIR").unwrap());
|
|
let ok = tmpdir.join("ok");
|
|
if env::var("YOU_ARE_A_LINKER").is_ok() {
|
|
if let Some(file) = env::args_os().find(|a| a.to_string_lossy().contains("@")) {
|
|
let file = file.to_str().expect("non-utf8 file argument");
|
|
fs::copy(&file[1..], &ok).unwrap();
|
|
}
|
|
return
|
|
}
|
|
|
|
let rustc = env::var_os("RUSTC").unwrap_or("rustc".into());
|
|
let me_as_linker = format!("linker={}", env::current_exe().unwrap().display());
|
|
for i in (1..).map(|i| i * 100) {
|
|
println!("attempt: {}", i);
|
|
let file = tmpdir.join("bar.rs");
|
|
let mut expected_libs = write_test_case(&file, i);
|
|
|
|
drop(fs::remove_file(&ok));
|
|
let output = Command::new(&rustc)
|
|
.arg(&file)
|
|
.arg("-C").arg(&me_as_linker)
|
|
.arg("--out-dir").arg(&tmpdir)
|
|
.env("YOU_ARE_A_LINKER", "1")
|
|
.output()
|
|
.unwrap();
|
|
|
|
if !output.status.success() {
|
|
let stderr = String::from_utf8_lossy(&output.stderr);
|
|
panic!("status: {}\nstdout:\n{}\nstderr:\n{}",
|
|
output.status,
|
|
String::from_utf8_lossy(&output.stdout),
|
|
stderr.lines().map(|l| {
|
|
if l.len() > 200 {
|
|
format!("{}...\n", &l[..200])
|
|
} else {
|
|
format!("{}\n", l)
|
|
}
|
|
}).collect::<String>());
|
|
}
|
|
|
|
if !ok.exists() {
|
|
continue
|
|
}
|
|
|
|
let linker_args = read_linker_args(&ok);
|
|
for arg in linker_args.split('S') {
|
|
expected_libs.remove(arg);
|
|
}
|
|
|
|
assert!(
|
|
expected_libs.is_empty(),
|
|
"expected but missing libraries: {:#?}\nlinker arguments: \n{}",
|
|
expected_libs,
|
|
linker_args,
|
|
);
|
|
|
|
break
|
|
}
|
|
}
|