Implement Stream.HasOverridenBeginEndXXX
#72252
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Fixes dotnet/corert#3251. `Stream.HasOverriddenBeginEndRead`/`Stream.HasOverriddenBeginEndWrite` are magic methods that call into the runtime on both CoreCLR and Mono to find out whether `Stream.BeginRead`/`EndRead`/`BeginWrite`/`EndWrite` are overriden on the current class. Since we don't have a runtime in NativeAOT, implement this in the compiler. The answer to this question is expressible in IL: load function pointer to the method virtually and non-virtually and compare. I'm not calling into `FunctionPointerOps` because I can't imagine a scenario where this wouldn't work, but I can be persuaded to call to `FunctionPointerOps` to do the comparison. Should make us pass all System.IO libraries tests.
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/azp run runtime-extra-platforms |
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Azure Pipelines successfully started running 1 pipeline(s). |
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/azp run runtime-extra-platforms |
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Azure Pipelines successfully started running 1 pipeline(s). |
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This seems like a good use case for the proposed methodof() c# operator. |
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Methodof is reflection and I don't think we can answer this efficiently with reflection. We would need LoadFunctionPointer and LoadVirtualFunctionPointer from dotnet/roslyn#11475 |
This was referenced Jul 17, 2022
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Fixes dotnet/corert#3251.
Stream.HasOverriddenBeginEndRead/Stream.HasOverriddenBeginEndWriteare magic methods that call into the runtime on both CoreCLR and Mono to find out whetherStream.BeginRead/EndRead/BeginWrite/EndWriteare overriden on the current class.Since we don't have a runtime in NativeAOT, implement this in the compiler. The answer to this question is expressible in IL: load function pointer to the method virtually and non-virtually and compare. I'm not calling into
FunctionPointerOpsbecause I can't imagine a scenario where this wouldn't work, but I can be persuaded to call toFunctionPointerOpsto do the comparison.Should make us pass all System.IO libraries tests.
Cc @dotnet/ilc-contrib