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Fix compiler panic with a large number of threads

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This commit is contained in:
Michal Piotrowski 2024-10-30 12:31:26 +01:00
parent 16422dbd89
commit 7591eb60ad
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2 changed files with 12 additions and 3 deletions
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11
compiler/rustc_session/src/options.rs
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@ -457,10 +457,11 @@ mod desc {
"either a boolean (`yes`, `no`, `on`, `off`, etc), or `nll` (default: `nll`)";
}
mod parse {
pub mod parse {
use std::str::FromStr;
pub(crate) use super::*;
pub(crate) const MAX_THREADS_CAP: usize = 256;
/// This is for boolean options that don't take a value and start with
/// `no-`. This style of option is deprecated.
@ -657,7 +658,7 @@ mod parse {
}
pub(crate) fn parse_threads(slot: &mut usize, v: Option<&str>) -> bool {
match v.and_then(|s| s.parse().ok()) {
let ret = match v.and_then(|s| s.parse().ok()) {
Some(0) => {
*slot = std::thread::available_parallelism().map_or(1, NonZero::<usize>::get);
true
@ -667,7 +668,11 @@ mod parse {
true
}
None => false,
}
};
// We want to cap the number of threads here to avoid large numbers like 999999 and compiler panics.
// This solution was suggested here https://github.com/rust-lang/rust/issues/117638#issuecomment-1800925067
*slot = slot.clone().min(MAX_THREADS_CAP);
ret
}
/// Use this for any numeric option that has a static default.