Use DllImportGenerator in System.Diagnostics.PerformanceCounter #61389
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Bah! Sorry @jkoritzinsky looks like I did miss that case <shame />
src/libraries/Common/src/System/Runtime/InteropServices/ArrayMarshaller.cs
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| <!-- Suppressions to avoid ifdefs: | ||
| CA1845: Use span-based 'string.Concat' and 'AsSpan' instead of 'Substring' | ||
| CA1846: Prefer 'AsSpan' over 'Substring' when span-based overloads are available --> | ||
| <NoWarn>$(NoWarn);CA1845;CA1846</NoWarn> |
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What's causing these analyzers to fire now and they didn't before?
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The reference to System.Memory (used by some parts of the generated p/invoke stubs).
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I see; then the analyzer sees that these APIs exist and the analyzers start running. Ok, thanks.
| { | ||
| [DllImport(Libraries.Advapi32, CharSet = CharSet.Unicode, BestFitMapping = false, EntryPoint = "RegEnumValueW", ExactSpelling = true)] | ||
| internal static extern int RegEnumValue( | ||
| [GeneratedDllImport(Libraries.Advapi32, EntryPoint = "RegEnumValueW", CharSet = CharSet.Unicode, ExactSpelling = true)] |
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are we assuming BestFitMapping = true is fine in these?
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Yeah, these are all using CharSet.Unicode, so BestFitMapping shouldn't matter.
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It seems like there are several variations of DllImport/GeneratedDllImport properties that are not meaningful or invalid but just ignored. I wonder whether it would make sense for the generator to flag/reject those so the ycan be cleaned up during conversion? I guess it is a minor thing.
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Certainly something we should keep in mind. We've been trying to remove support for sometimes-non-meaningful things (like BestFitMapping) from GeneratedDllImport, so hopefully it will be in a much better replace than DllImport in terms of weird properties and combinations.
| [DllImport(Interop.Libraries.Advapi32, EntryPoint = "GetSecurityDescriptorLength", CallingConvention = CallingConvention.Winapi, | ||
| CharSet = CharSet.Unicode, ExactSpelling = true)] | ||
| internal static extern /*DWORD*/ uint GetSecurityDescriptorLength(IntPtr byteArray); | ||
| [GeneratedDllImport(Libraries.Advapi32, EntryPoint = "GetSecurityDescriptorLength", CharSet = CharSet.Unicode, ExactSpelling = true)] |
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I guess we are just removing CallingConvention = CallingConvention.Winapi from everywhere as it's default and archaic.
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| #if DLLIMPORTGENERATOR_ENABLED | ||
| [GeneratedDllImport(Interop.Libraries.Advapi32, CharSet = CharSet.Unicode, SetLastError = true)] | ||
| [GeneratedDllImport(Interop.Libraries.Advapi32, SetLastError = true)] |
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why remove CharSet = CharSet.Unicode ? is it the default now?
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It is not the default. I removed it because it is not necessary for this p/invoke - no string data being marshalled, no A/W suffix variants - and having it set to Unicode in this case makes it so that we do an extra probe for an entry point named GetTokenInformationW, since when ExactSpelling is false, we check for the W suffix first for Unicode (but no suffix first for Ansi).
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this seems like a great thing for the generator to warn on (I say the generator since it's new so it wouldn't be a breaking change, and folks are touching their sources anyway)
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We're currently discussing how we can make the whole character set situation better with the generator approach: #61326.
One thing we are considering as part of that is removing ExactSpelling (so weird/negative implications of char set like this wouldn't be a thing) and effectively requiring it to always be true.
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Since we forwarding on down-level, this also enables
DllImportGeneratorby default when targeting Framework (asSystem.Diagnostics.PerformanceCounterdoes).cc @AaronRobinsonMSFT @jkoritzinsky