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coverage: Don't create an intermediate vec for each BCB's initial spans

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This commit is contained in:
Zalathar 2023-10-17 23:02:22 +11:00
parent a17ff82aae
commit e16494469e
1 changed files with 23 additions and 26 deletions
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17
compiler/rustc_mir_transform/src/coverage/spans/from_mir.rs
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@ -1,3 +1,4 @@
use rustc_data_structures::captures::Captures;
use rustc_middle::mir::{
self, FakeReadCause, Statement, StatementKind, Terminator, TerminatorKind,
};
@ -12,7 +13,7 @@ pub(super) fn mir_to_initial_sorted_coverage_spans(
body_span: Span,
basic_coverage_blocks: &CoverageGraph,
) -> Vec<CoverageSpan> {
let mut initial_spans = Vec::<CoverageSpan>::with_capacity(mir_body.basic_blocks.len() * 2);
let mut initial_spans = Vec::with_capacity(mir_body.basic_blocks.len() * 2);
for (bcb, bcb_data) in basic_coverage_blocks.iter_enumerated() {
initial_spans.extend(bcb_to_initial_coverage_spans(mir_body, body_span, bcb, bcb_data));
}
@ -50,16 +51,13 @@ pub(super) fn mir_to_initial_sorted_coverage_spans(
// for each `Statement` and `Terminator`. (Note that subsequent stages of coverage analysis will
// merge some `CoverageSpan`s, at which point a `CoverageSpan` may represent multiple
// `Statement`s and/or `Terminator`s.)
fn bcb_to_initial_coverage_spans(
mir_body: &mir::Body<'_>,
fn bcb_to_initial_coverage_spans<'a, 'tcx>(
mir_body: &'a mir::Body<'tcx>,
body_span: Span,
bcb: BasicCoverageBlock,
bcb_data: &BasicCoverageBlockData,
) -> Vec<CoverageSpan> {
bcb_data
.basic_blocks
.iter()
.flat_map(|&bb| {
bcb_data: &'a BasicCoverageBlockData,
) -> impl Iterator<Item = CoverageSpan> + Captures<'a> + Captures<'tcx> {
bcb_data.basic_blocks.iter().flat_map(move |&bb| {
let data = &mir_body[bb];
data.statements
.iter()
@ -77,7 +75,6 @@ fn bcb_to_initial_coverage_spans(
CoverageSpan::for_terminator(function_source_span(span, body_span), span, bcb)
}))
})
.collect()
}
/// If the MIR `Statement` has a span contributive to computing coverage spans,