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coverage: Clean up marker statements that aren't needed later

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Some of the marker statements used by coverage are added during MIR building
for use by the InstrumentCoverage pass (during analysis), and are not needed
afterwards.
This commit is contained in:
Zalathar
2024-03-15 22:27:30 +11:00
parent cdb683f6e4
commit 91aae58568
8 changed files with 159 additions and 14 deletions
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10
compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs
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@@ -85,14 +85,6 @@ impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> {
let bx = self;
match coverage.kind {
// Marker statements have no effect during codegen,
// so return early and don't create `func_coverage`.
CoverageKind::SpanMarker | CoverageKind::BlockMarker { .. } => return,
// Match exhaustively to ensure that newly-added kinds are classified correctly.
CoverageKind::CounterIncrement { .. } | CoverageKind::ExpressionUsed { .. } => {}
}
let Some(function_coverage_info) =
bx.tcx.instance_mir(instance.def).function_coverage_info.as_deref()
else {
@@ -109,7 +101,7 @@ impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> {
let Coverage { kind } = coverage;
match *kind {
CoverageKind::SpanMarker | CoverageKind::BlockMarker { .. } => unreachable!(
"unexpected marker statement {kind:?} should have caused an early return"
"marker statement {kind:?} should have been removed by CleanupPostBorrowck"
),
CoverageKind::CounterIncrement { id } => {
func_coverage.mark_counter_id_seen(id);