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coverage: Remove some dead code from MC/DC branch mapping conversion

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This commit is contained in:
Zalathar 2025-01-21 13:59:01 +11:00
parent 8a6e06fecb
commit ec6fc95d6d
1 changed files with 13 additions and 19 deletions
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20
compiler/rustc_mir_transform/src/coverage/mod.rs
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@ -180,7 +180,12 @@ fn create_mappings(
));
for (decision, branches) in mcdc_mappings {
let num_conditions = branches.len() as u16;
// FIXME(#134497): Previously it was possible for some of these branch
// conversions to fail, in which case the remaining branches in the
// decision would be degraded to plain `MappingKind::Branch`.
// The changes in #134497 made that failure impossible, because the
// fallible step was deferred to codegen. But the corresponding code
// in codegen wasn't updated to detect the need for a degrade step.
let conditions = branches
.into_iter()
.map(
@ -206,24 +211,13 @@ fn create_mappings(
)
.collect::<Vec<_>>();
if conditions.len() == num_conditions as usize {
// LLVM requires end index for counter mapping regions.
let kind = MappingKind::MCDCDecision(DecisionInfo {
bitmap_idx: (decision.bitmap_idx + decision.num_test_vectors) as u32,
num_conditions,
num_conditions: u16::try_from(conditions.len()).unwrap(),
});
let span = decision.span;
mappings.extend(std::iter::once(Mapping { kind, span }).chain(conditions.into_iter()));
} else {
mappings.extend(conditions.into_iter().map(|mapping| {
let MappingKind::MCDCBranch { true_term, false_term, mcdc_params: _ } =
mapping.kind
else {
unreachable!("all mappings here are MCDCBranch as shown above");
};
Mapping { kind: MappingKind::Branch { true_term, false_term }, span: mapping.span }
}))
}
}
mappings