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coverage: Don't track curr_original_span explicitly

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Now that we never mutate `curr.span`, we don't need to store its original span
separately.
This commit is contained in:
Zalathar 2024-02-13 12:42:30 +11:00
parent 412c86cf03
commit 5a569b1b80
1 changed files with 2 additions and 11 deletions
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13
compiler/rustc_mir_transform/src/coverage/spans.rs
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@ -155,16 +155,11 @@ struct SpansRefiner<'a> {
/// iteration.
some_curr: Option<CoverageSpan>,
/// The original `span` for `curr`, in case `curr.span()` is modified. The `curr_original_span`
/// **must not be mutated** (except when advancing to the next `curr`), even if `curr.span()`
/// is mutated.
curr_original_span: Span,
/// The CoverageSpan from a prior iteration; typically assigned from that iteration's `curr`.
/// If that `curr` was discarded, `prev` retains its value from the previous iteration.
some_prev: Option<CoverageSpan>,
/// Assigned from `curr_original_span` from the previous iteration. The `prev_original_span`
/// Assigned from `curr.span` from the previous iteration. The `prev_original_span`
/// **must not be mutated** (except when advancing to the next `prev`), even if `prev.span()`
/// is mutated.
prev_original_span: Span,
@ -196,7 +191,6 @@ impl<'a> SpansRefiner<'a> {
basic_coverage_blocks,
sorted_spans_iter: sorted_spans.into_iter(),
some_curr: None,
curr_original_span: DUMMY_SP,
some_prev: None,
prev_original_span: DUMMY_SP,
pending_dups: Vec::new(),
@ -340,8 +334,8 @@ impl<'a> SpansRefiner<'a> {
/// Advance `prev` to `curr` (if any), and `curr` to the next `CoverageSpan` in sorted order.
fn next_coverage_span(&mut self) -> bool {
if let Some(curr) = self.some_curr.take() {
self.prev_original_span = curr.span;
self.some_prev = Some(curr);
self.prev_original_span = self.curr_original_span;
}
while let Some(curr) = self.sorted_spans_iter.next() {
debug!("FOR curr={:?}", curr);
@ -356,9 +350,6 @@ impl<'a> SpansRefiner<'a> {
closure?); prev={prev:?}",
);
} else {
// Save a copy of the original span for `curr` in case the `CoverageSpan` is changed
// by `self.curr_mut().merge_from(prev)`.
self.curr_original_span = curr.span;
self.some_curr.replace(curr);
self.maybe_flush_pending_dups();
return true;