[release/7.0] SyntaxValueProvider: avoid performance issue with syntax list containing many items #83743
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Tagging subscribers to this area: @dotnet/area-extensions-logging Issue DetailsBackport of #83483 to release/7.0 Customer ImpactTestingRiskIMPORTANT: Is this backport for a servicing release? If so and this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.
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Needs package changes for JSON and Logging |
rbhanda
added
Servicing-approved
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I'm retargeting this PR to the new Repo maintainers will now be allowed to merge their own servicing PR as long as it meets the requirements:
The new process is described here: runtime/docs/project/library-servicing.md. The infra team will be actively monitoring servicing PRs to ensure all requirements are met and to help with any issues. Let me know if you have any questions. |
carlossanlop
added
Servicing-approved
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The CI failures are not related and are known issues. Merging this PR. |
ghost
locked as resolved and limited conversation to collaborators
Backport of #83483 to release/7.0
/cc @ericstj @cston
Customer Impact
Original issue: dotnet/roslyn#66475
When a source file contains a large array, performance of compilation degraded substantially (customer case was 50x observed build perf). This bug will appear as a regression from GA since this was introduced in the servicing change #72219.
Testing
Test added to cover this scenario.
The repro from dotnet/roslyn#66475 (comment) uses the implementation of
SyntaxValueProvider.ForAttributeWithSimpleNamefrom Microsoft.CodeAnalysis.dll rather than System.Text.Json.SourceGeneration.dll however, and is not affected by this change in 7.0.Risk
Low. This just adds an additional forward iteration.