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Optimize out metadata for typeof(X).IsValueType and .IsEnum #118528

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Optimize out metadata for typeof(X).IsValueType and .IsEnum #118528

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03a5e13
Optimize out metadata for `typeof(X).IsValueType` and `.IsEnum`
MichalStrehovsky Aug 8, 2025
0936710
Update src/coreclr/tools/aot/ILCompiler.Compiler/IL/ILImporter.Scanne…
MichalStrehovsky Aug 8, 2025
a18cfc3
Update ILImporter.Scanner.cs
MichalStrehovsky Aug 8, 2025
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18 changes: 18 additions & 0 deletions src/coreclr/tools/aot/ILCompiler.Compiler/IL/ILImporter.Scanner.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -959,6 +959,24 @@ private void ImportLdToken(int token)
}
}

// We might also be able to optimize this if this is something like typeof(Foo).IsValueType
// that doesn't need reflection metadata for the answer.
if (helperId != ReadyToRunHelperId.NecessaryTypeHandle)
{
reader = new ILReader(_ilBytes, _currentOffset);
if (reader.HasNext
&& reader.ReadILOpcode() == ILOpcode.call
&& IsTypeGetTypeFromHandle((MethodDesc)_methodIL.GetObject(reader.ReadILToken())))
{
if (reader.HasNext
&& reader.ReadILOpcode() is ILOpcode.callvirt or ILOpcode.call
&& _methodIL.GetObject(reader.ReadILToken()) is MethodDesc{ Name: "get_IsValueType" or "get_IsEnum"})
{
helperId = ReadyToRunHelperId.NecessaryTypeHandle;
}
}
}

_factory.MetadataManager.GetDependenciesDueToAccess(ref _dependencies, _factory, _methodIL, (TypeDesc)_canonMethodIL.GetObject(token));

_dependencies.Add(GetHelperEntrypoint(ReadyToRunHelper.GetRuntimeTypeHandle), "ldtoken");
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