coverage: Clarify some parts of coverage counter creation #130380
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r? @fee1-dead rustbot has assigned @fee1-dead. Use |
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Some changes occurred to MIR optimizations cc @rust-lang/wg-mir-opt |
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- Look up the node's predecessors only once - Get rid of some overly verbose logging - Explain why some nodes need physical counters - Extract a helper method to create and set a physical node counter
By building the list of candidate edges up-front, and making the candidate-selection method fallible, we can remove a few pieces of awkward code.
This does a better job of expressing the special cases that occur when a node in the coverage graph has exactly one in-edge.
Given that we directly access the graph predecessors/successors in so many other places, and sometimes must do so to satisfy the borrow checker, there is little value in having this trivial helper method.
Swatinem
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jieyouxu
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Thanks. @bors r=jieyouxu |
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…iaskrgr Rollup of 4 pull requests Successful merges: - rust-lang#130380 (coverage: Clarify some parts of coverage counter creation) - rust-lang#130427 (run_make_support: rectify symlink handling) - rust-lang#130447 (rustc_llvm: update for llvm/llvm-project@2ae968a0d9fb61606b020e898d88…) - rust-lang#130448 (fix: Remove duplicate `LazyLock` example.) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#130380 - Zalathar:counters, r=jieyouxu coverage: Clarify some parts of coverage counter creation This is a series of semi-related changes that are trying to make the `counters` module easier to read, understand, and modify. For example, the existing code happens to avoid ever using the count for a `TerminatorKind::Yield` node as the count for its sole out-edge (since doing so would be incorrect), but doesn't do so explicitly, so seemingly-innocent changes can result in baffling test failures. This PR also takes the opportunity to simplify some debug-logging code that was making its surrounding code disproportionately hard to read. There should be no changes to the resulting coverage instrumentation/mappings, as demonstrated by the absence of changes to the coverage test suite.
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coverage: Make counter creation handle node/edge counters more uniformly Similar to rust-lang#130380, this is another round of small improvements informed by my ongoing attempts to overhaul coverage counter creation. One of the big benefits is getting rid of the awkward special-case that would sometimes attach an edge counter to a node instead. That was needed by the code that chooses which out-edge should be given a counter expression, but we can avoid that by making the corresponding check a little smarter. I've also renamed several things to be simpler and more consistent, which should help with future changes.
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Rollup merge of rust-lang#131918 - Zalathar:counters, r=nnethercote coverage: Make counter creation handle node/edge counters more uniformly Similar to rust-lang#130380, this is another round of small improvements informed by my ongoing attempts to overhaul coverage counter creation. One of the big benefits is getting rid of the awkward special-case that would sometimes attach an edge counter to a node instead. That was needed by the code that chooses which out-edge should be given a counter expression, but we can avoid that by making the corresponding check a little smarter. I've also renamed several things to be simpler and more consistent, which should help with future changes.
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This is a series of semi-related changes that are trying to make the
countersmodule easier to read, understand, and modify.For example, the existing code happens to avoid ever using the count for a
TerminatorKind::Yieldnode as the count for its sole out-edge (since doing so would be incorrect), but doesn't do so explicitly, so seemingly-innocent changes can result in baffling test failures.This PR also takes the opportunity to simplify some debug-logging code that was making its surrounding code disproportionately hard to read.
There should be no changes to the resulting coverage instrumentation/mappings, as demonstrated by the absence of changes to the coverage test suite.