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coverage: Simplify building coverage expressions based on sums by Zalathar · Pul...

 5 months ago
source link: https://github.com/rust-lang/rust/pull/117651
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This is a combination of some interlinked changes to the code that creates coverage counters/expressions for nodes and edges in the coverage graph:

  • Some preparatory cleanups in MakeBcbCounters::make_branch_counters
  • Use BcbCounter (instead of CovTerm) when building coverage expressions
    • This makes it easier to introduce a fold for building sums
  • Simplify the creation of coverage expressions based on sums, by having Iterator::fold do much of the work
  • Get rid of the awkward BcbBranch enum, and replace it with graph edges represented as (from_bcb, to_bcb)
    • This further simplifies the body of the fold

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