incremental: bugfixes #22379
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incremental: bugfixes #22379
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ghost
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Jan 1, 2025
Previously, logic in `Compilation.getAllErrorsAlloc` was corrupting the `failed_analysis` hashmap. This meant that on updates after the initial update, attempts to remove entries from this map (because the `AnalUnit` in question is being re-analyzed) silently failed. This resulted in compile errors from earlier updates wrongly getting "stuck", i.e. never being removed. This commit also adds a few log calls which helped me to find this bug.
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Nice, looking forward to trying it out again :) |
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Fixes a few bugs with incremental compilation. The first tripped an assert in some cases (although didn't actually affect ReleaseFast compilers in practice AFAICT), while the second was a much more significant bug. The bug in question was that while collecting error bundles, we corrupted the state of
Zcu.failed_analysison the false assumption that we would never use it again. That meant that when future incremental updates tried to remove elements from the map (because the correspondingAnalUnitwas undergoing re-analysis), the error wasn't found by the lookup, causing it to persist forever.@andrewrk, this bug absolutely explains why we have consistently been having issues with incremental compilation when trying to use
-Dno-bin -fincremental --watchfor e.g. big compiler changesets. Because ofstd.ArrayHashMapUnmanaged(...).linear_scan_max, this bug did not manifest on small test cases (i.e. every case intest/incremental/!), but did manifest very nastily once you exceeded 8 compile errors. After this is merged, I'd encourage you to give incremental another go!