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Convert a few reflection FCalls to C# #92512

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merged 5 commits into from
Sep 23, 2023
Merged

Convert a few reflection FCalls to C# #92512

merged 5 commits into from
Sep 23, 2023

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jkotas
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@jkotas jkotas commented Sep 23, 2023

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@ghost ghost assigned jkotas Sep 23, 2023
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ghost commented Sep 23, 2023

Tagging subscribers to this area: @dotnet/area-system-reflection
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Author: jkotas
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area-System.Reflection
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jkotas
jkotas commented Sep 23, 2023
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src/coreclr/nativeaot/System.Private.CoreLib/src/System/Type.Internal.cs
namespace System
{
//
// This file contains methods on Type that are internal to the framework.
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This historic split does not make sense anymore.

@build-analysis build-analysis bot mentioned this pull request Sep 23, 2023
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Wraith2 commented Sep 23, 2023

The name IsActualValueType seems strange. What is actual about a type which makes it not possible to use IsValueType and is there a way to make that distinction clearer?

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jkotas commented Sep 23, 2023

IsActualValueType matches the existing IsActualEnum name. The public Type.IsValueType and Type.IsEnum properties have a questionable behavior for generic parameters: They return true for the generic parameters in some cases (#90993 (comment)). It is a behavior one pretty much never wants and it leads to bugs. Also, this quirk makes the API slower.

More self-descripting name would be IsValueTypeWithoutTheGenericParameterQuirk and IsEnumWithoutTheGenericParameterQuirk that is a mouthful. I am going to add better comment.

EgorBo
EgorBo reviewed Sep 23, 2023
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src/coreclr/System.Private.CoreLib/src/System/RuntimeType.CoreCLR.cs
TypeHandle th = GetNativeTypeHandle();

bool isInterface = !th.IsTypeDesc && th.AsMethodTable()->IsInterface;
GC.KeepAlive(this);
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@EgorBo EgorBo Sep 23, 2023 •
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I wonder if JIT is allowed to fold typeof(T).IsInterface without intrinsics at all - the RuntimeType object is on the NonGC heap, GetNativeTypeHandle() is basically MethodTable which is mostly immutable 🙂 so in theory jit could fold ->m_handle->field

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Yeah, it would be possible in theory. I am not sure whether it would make things simpler overall.

@build-analysis build-analysis bot mentioned this pull request Sep 23, 2023
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@jkotas jkotas merged commit d45854c into dotnet:main Sep 23, 2023
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@jkotas jkotas deleted the fcalls branch September 23, 2023 18:09
@EgorBo EgorBo mentioned this pull request Sep 28, 2023
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@EgorBo EgorBo EgorBo approved these changes

@marek-safar marek-safar Awaiting requested review from marek-safar

@MichalStrehovsky MichalStrehovsky Awaiting requested review from MichalStrehovsky MichalStrehovsky is a code owner

@steveharter steveharter Awaiting requested review from steveharter

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@jkotas @Wraith2 @EgorBo