Optimize EngineFileUtilities.GetFileList #6227
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Forgind
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| { | ||
| return false; | ||
| } | ||
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| // If the item's Include has both escaped wildcards and real wildcards, then it's |
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You took out the color from the original! But that's ok 😉
| string hexString = escapedString.Substring(indexOfPercent + 1, 2); | ||
| char unescapedCharacter = (char)int.Parse(hexString, System.Globalization.NumberStyles.HexNumber, | ||
| CultureInfo.InvariantCulture); | ||
| char unescapedCharacter = (char)((digit1 << 4) + digit2); |
src/Shared/EscapingUtilities.cs
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| } | ||
| index = escapedString.IndexOf('%', index + 1, escapedString.Length - index - 3); |
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We want something that looks like %3f or whatever, and that takes three characters. This means no need for verifying that there are enough characters afterwards.
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Ah, index + 1 means 1 less character to look at ;)
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Well, we also know that index is the index of a %, so using index instead would result in saying index = index; ad infinitum.
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I tweaked the expression to be more readable and added comments.
cdmihai
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benvillalobos
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Fixes #6061
Context
EngineFileUtilities.GetFileListhas been identified as one of the performance bottlenecks when building .NET Core projects. Since this code is called as part of project evaluation, it directly impacts Visual Studio performance as well, especially solution load.Changes Made
Tweaked the code under
GetFileList:Testing
Existing unit tests for correctness, ETL traces for performance.
This change together with #6151 is showing about 30% less time spent in this particular function when building a Hello World .NET Core project with the Framework version of MSBuild. It's an OK win for project evaluation perf but translates to less than 1 ms of total command line build time.
Notes
This PR is small but still recommended to be reviewed commit by commit.