Produce less string allocs while formatting documents #73452
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CyrusNajmabadi
commented
May 13, 2024
| if (!previousToken.ContainsAnnotations && !currentToken.ContainsAnnotations) | ||
| return false; | ||
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| if (!previousToken.HasTrailingTrivia && !currentToken.HasLeadingTrivia) |
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just formatting so i could understand the code.
CyrusNajmabadi
commented
May 13, 2024
| => t == null; | ||
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| public static bool IsNotNull<T>(T t) where T : class | ||
| => !IsNull(t); |
CyrusNajmabadi
commented
May 13, 2024
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| return previousToken.TrailingTrivia.HasAnyWhitespaceElasticTrivia() || currentToken.LeadingTrivia.HasAnyWhitespaceElasticTrivia(); | ||
| } | ||
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| public static bool IsNull<T>(T t) where T : class | ||
| => t == null; |
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mostly pointless. so inlined.
CyrusNajmabadi
commented
May 13, 2024
| @@ -53,7 +54,8 @@ public static bool ContainsElasticTrivia(this SuppressOperation operation, Token | |||
| var endToken = tokenStream.GetTokenData(operation.EndToken); | |||
| var previousToken = endToken.GetPreviousTokenData(); | |||
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| return tokenStream.GetTriviaData(startToken, nextToken).TreatAsElastic || tokenStream.GetTriviaData(previousToken, endToken).TreatAsElastic; | |||
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getting TriviaData is not cheap. It allocates up front (The substring between tokesn). I looked into changing that, but it was non-trivial. so thsi was the expedient solution.
This was referenced May 15, 2024
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Could someone please tell me what perf tool is being used in those screenshots? |
See https://github.com/microsoft/perfview/releases |
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Takes us from:
to:
(we actually call this in several places, which is why we get 800 MB drop).