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[DRAFT] Use Rust's sort_by instead of timsort::try_sort_by_gt #6096

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[DRAFT] Use Rust's sort_by instead of timsort::try_sort_by_gt #6096

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8720cd1
POC: Use Rust's `sort_by` instead of `timsort::try_sort_by_gt`
Aug 15, 2025
8b909c3
POC: Return Ordering::Equal if exception and see what happens
Aug 16, 2025
c2ef2e3
POC: Track PyBaseExceptionRef using mut variable
Aug 17, 2025
5f9a9fd
POC: cargo fmt
Aug 17, 2025
9b3871d
POC: cargo clippy
Aug 17, 2025
78d10eb
more clippy
Aug 17, 2025
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30 changes: 26 additions & 4 deletions vm/src/builtins/list.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -504,6 +504,8 @@ impl Representable for PyList {
}
}

use crate::exceptions::types::PyBaseExceptionRef;
use std::cmp::Ordering;
fn do_sort(
vm: &VirtualMachine,
values: &mut Vec<PyObjectRef>,
Expand All @@ -515,20 +517,40 @@ fn do_sort(
} else {
PyComparisonOp::Gt
};
let cmp = |a: &PyObjectRef, b: &PyObjectRef| a.rich_compare_bool(b, op, vm);

// If a PyException is encountered stop swapping elements and store the error.
let mut error_slot: Option<PyBaseExceptionRef> = None;
let mut cmp = |a: &PyObjectRef, b: &PyObjectRef| match a.rich_compare_bool(b, op, vm) {
Ok(res) => {
if res {
Ordering::Greater
} else {
Ordering::Less
}
Comment on lines +525 to +529
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The meaning of true/false will be different by op

}
Err(e) => {
error_slot = Some(e);
Ordering::Equal
}
};

if let Some(ref key_func) = key_func {
let mut items = values
.iter()
.map(|x| Ok((x.clone(), key_func.call((x.clone(),), vm)?)))
.collect::<Result<Vec<_>, _>>()?;
timsort::try_sort_by_gt(&mut items, |a, b| cmp(&a.1, &b.1))?;
// timsort::try_sort_by_gt(&mut items, |a, b| cmp(&a.1, &b.1))?;
items.sort_unstable_by(|a, b| cmp(&a.1, &b.1));
*values = items.into_iter().map(|(val, _)| val).collect();
} else {
timsort::try_sort_by_gt(values, cmp)?;
values.sort_unstable_by(cmp);
}

Ok(())
// After the sort is done, check if an error was captured.
match error_slot {
Some(e) => Err(e),
None => Ok(()),
}
}

#[pyclass(module = false, name = "list_iterator", traverse)]
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