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coverage: Restrict ExpressionUsed simplification to Code mappings

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In the future, branch and MC/DC mappings might have expressions that don't
correspond to any single point in the control-flow graph. That makes it
trickier to keep track of which expressions should expect an `ExpressionUsed`
node.

We therefore sidestep that complexity by only performing `ExpressionUsed`
simplification for expressions associated directly with ordinary `Code`
mappings.
This commit is contained in:
Zalathar 2024-07-15 20:32:14 +10:00
parent 741ed01646
commit d4f1f92426
4 changed files with 27 additions and 19 deletions
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9
compiler/rustc_mir_transform/src/coverage/mappings.rs
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@ -159,6 +159,15 @@ impl ExtractedMappings {
bcbs_with_counter_mappings
}
/// Returns the set of BCBs that have one or more `Code` mappings.
pub(super) fn bcbs_with_ordinary_code_mappings(&self) -> BitSet<BasicCoverageBlock> {
let mut bcbs = BitSet::new_empty(self.num_bcbs);
for &CodeMapping { span: _, bcb } in &self.code_mappings {
bcbs.insert(bcb);
}
bcbs
}
}
fn resolve_block_markers(