WIP - fix coverage in attr macro spans #85173
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☔ The latest upstream changes (presumably #84278) made this pull request unmergeable. Please resolve the merge conflicts. |
Fixes: rust-lang#84018 With `-Z instrument-coverage`, coverage reporting of dead blocks (for example, blocks dropped because a conditional branch is dropped, based on const evaluation) is now supported. Note, this PR relands an earlier, reverted PR that failed when compiling generators. Generators clone blocks, so CFG simplification is used to remove the original `BasicBlocks`; and since they were cloned, the original blocks should not be saved. (Saving them resulted in duplicate coverage counters, and `llvm-cov` failed with a "Malformed coverage data" error. If `instrument-coverage` is enabled, `simplify::remove_dead_blocks_with_coverage()`, with `DroppedCoverage::SaveUnreachable`, finds all dropped coverage `Statement`s and adds their `code_region`s as `Unreachable` coverage `Statement`s to the `START_BLOCK`, so they are still included in the coverage map. Check out the resulting changes in the test coverage reports in this PR.
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Such as #[fuchsia_async::run_singlethreaded] Note the spanview output seems to show good coverage spans, but when running coverage reports, the fuchsia_async functions showed `0` for coverage of tests that ran once, and `llvm-cov` reports a Malformed Coverage error.
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Closing this PR because I was able to resolve the problem by fixing the proc macro (in the specific case). |
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Such as
#[fuchsia_async::run_singlethreaded]Note the spanview output seems to show good coverage spans, but when
running coverage reports, the fuchsia_async functions showed
0forcoverage of tests that ran once, and
llvm-covreports a MalformedCoverage error.
r? @tmandry