Reduce intermediate array allocations in inline hint implementation#81309
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ToddGrun merged 2 commits intodotnet:mainfrom Nov 18, 2025
Merged
Reduce intermediate array allocations in inline hint implementation#81309ToddGrun merged 2 commits intodotnet:mainfrom
ToddGrun merged 2 commits intodotnet:mainfrom
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AbstractInlineHintService retrieves two intermediate arraysfrom the type and parameter services and then joins them together and returns the resultant array. Instead, pass an ArrayBuilder to the type and parameter services and have them populate it directly, and then only allocate a single IA from the ArrayBuilder.
src/Features/Core/Portable/InlineHints/AbstractInlineParameterNameHintsService.cs
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CyrusNajmabadi
approved these changes
Nov 18, 2025
…NameHintsService.cs Co-authored-by: Cyrus Najmabadi <cyrus.najmabadi@gmail.com>
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AbstractInlineHintService currently retrieves two intermediate arrays from the type and parameter services and then joins them together and returns the resultant array. Instead, pass an ArrayBuilder to the type and parameter services and have them populate it directly, and then only allocate a single IA from the ArrayBuilder.
Test insertion: https://dev.azure.com/devdiv/DevDiv/_git/VS/pullrequest/689100
This previously showed as 4.5% (5.0 MB) of RoslynCodeAnalysisService allocations in the html completion scenario in the RazorEditingTests.CompletionInCohosting speedometer test. With this change, allocations of the InlineHint[] went down to 1.8% (2.1 MB)
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*** AFTER (roslyn symbols didn't load for some reason) ***
