bjoernager/rust
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coverage: Call prev/curr less in other places

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This reduces clutter, and makes it easier to notice regions where mutations
definitely don't occur.
This commit is contained in:
Zalathar 2023-10-15 13:23:26 +11:00
parent b1c44f4a25
commit 41038dbe4a
1 changed files with 17 additions and 11 deletions
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28
compiler/rustc_mir_transform/src/coverage/spans.rs
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@ -398,17 +398,19 @@ impl<'a> CoverageSpansGenerator<'a> {
/// If `curr` is part of a new macro expansion, carve out and push a separate
/// span that ends just after the macro name and its subsequent `!`.
fn maybe_push_macro_name_span(&mut self) {
let Some(visible_macro) = self.curr().visible_macro(self.body_span) else { return };
let curr = self.curr();
let Some(visible_macro) = curr.visible_macro(self.body_span) else { return };
if let Some(prev) = &self.some_prev
&& prev.expn_span.ctxt() == self.curr().expn_span.ctxt()
&& prev.expn_span.ctxt() == curr.expn_span.ctxt()
{
return;
}
let merged_prefix_len = self.curr_original_span.lo() - self.curr().span.lo();
let merged_prefix_len = self.curr_original_span.lo() - curr.span.lo();
let after_macro_bang = merged_prefix_len + BytePos(visible_macro.as_str().len() as u32 + 1);
let mut macro_name_cov = self.curr().clone();
self.curr_mut().span = self.curr().span.with_lo(self.curr().span.lo() + after_macro_bang);
let mut macro_name_cov = curr.clone();
self.curr_mut().span = curr.span.with_lo(curr.span.lo() + after_macro_bang);
macro_name_cov.span =
macro_name_cov.span.with_hi(macro_name_cov.span.lo() + after_macro_bang);
debug!(
@ -521,11 +523,14 @@ impl<'a> CoverageSpansGenerator<'a> {
/// extends to the right of the closure, update `prev` to that portion of the span. For any
/// `pending_dups`, repeat the same process.
fn carve_out_span_for_closure(&mut self) {
let curr_span = self.curr().span;
let left_cutoff = curr_span.lo();
let right_cutoff = curr_span.hi();
let has_pre_closure_span = self.prev().span.lo() < right_cutoff;
let has_post_closure_span = self.prev().span.hi() > right_cutoff;
let prev = self.prev();
let curr = self.curr();
let left_cutoff = curr.span.lo();
let right_cutoff = curr.span.hi();
let has_pre_closure_span = prev.span.lo() < right_cutoff;
let has_post_closure_span = prev.span.hi() > right_cutoff;
let mut pending_dups = self.pending_dups.split_off(0);
if has_pre_closure_span {
let mut pre_closure = self.prev().clone();
@ -580,7 +585,8 @@ impl<'a> CoverageSpansGenerator<'a> {
let initial_pending_count = self.pending_dups.len();
if initial_pending_count > 0 {
let mut pending_dups = self.pending_dups.split_off(0);
pending_dups.retain(|dup| !self.span_bcb_dominates(dup, self.curr()));
let curr = self.curr();
pending_dups.retain(|dup| !self.span_bcb_dominates(dup, curr));
self.pending_dups.append(&mut pending_dups);
if self.pending_dups.len() < initial_pending_count {
debug!(