coverage: Associate hole spans with expansion tree nodes #148812
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This is an incremental step towards making the expansion tree central to coverage mapping creation, which will be needed for proper expansion region support.
This also replaces `push_covspan` with a separate covspan-filtering step, because the relevant code is being reindented anyway.
This will make it easier to perform span refinement for child expansions.
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Some changes occurred to MIR optimizations cc @rust-lang/wg-mir-opt |
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rustbot has assigned @JonathanBrouwer. Use |
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This PR is another incremental step towards expansion region support in coverage instrumentation.
When preparing coverage mappings for a function, we extract “raw” spans from MIR, and then use “hole” spans extracted from HIR to avoid overlap with nested items and closures. That hole-carving process was historically built around the assumption that there would be one set of spans and holes per function, but expansion region support will need to invalidate that assumption.
Therefore, to be more friendly to future work on expansion regions, this PR associates each hole span with its corresponding node in the expansion tree, and makes the span refinement step obtain holes from the current node.
There should be no change to compiler output.