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coverage: Add a synthetic test for when all spans are discarded

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This commit is contained in:
Zalathar 2024-12-19 21:53:10 +11:00
parent 837a25dd41
commit aced4dcf10
8 changed files with 67 additions and 3 deletions
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11
compiler/rustc_codegen_llvm/src/coverageinfo/mapgen/covfun.rs
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@ -132,6 +132,7 @@ fn fill_region_tables<'tcx>(
let make_cov_span = |span: Span| {
spans::make_coverage_span(local_file_id, source_map, fn_cov_info, &source_file, span)
};
let discard_all = tcx.sess.coverage_discard_all_spans_in_codegen();
// For each counter/region pair in this function+file, convert it to a
// form suitable for FFI.
@ -141,7 +142,17 @@ fn fill_region_tables<'tcx>(
// MIR opts, replace those occurrences with zero.
let kind = kind.map_terms(|term| if is_zero_term(term) { CovTerm::Zero } else { term });
// Convert the `Span` into coordinates that we can pass to LLVM, or
// discard the span if conversion fails. In rare, cases _all_ of a
// function's spans are discarded, and the rest of coverage codegen
// needs to handle that gracefully to avoid a repeat of #133606.
// We don't have a good test case for triggering that organically, so
// instead we set `-Zcoverage-options=discard-all-spans-in-codegen`
// to force it to occur.
let Some(cov_span) = make_cov_span(span) else { continue };
if discard_all {
continue;
}
match kind {
MappingKind::Code(term) => {