Support marshalled delegates with NativeAOT on iOS platforms #82090
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Tagging subscribers to this area: @agocke, @MichalStrehovsky, @jkotas Issue DetailsNativeAOT supports marshalled delegates for platforms with hardened runtime by using a scheme of preallocated thunks which is available under the Even though marshalled delegates are considered as a legacy feature, they can still be used in the user's code and even framework libraries (e.g., Xamarin: https://github.com/xamarin/xamarin-macios/blob/main/src/ObjCRuntime/Blocks.cs#L122) which means they have to be supported in some way. As a final note, NativeAOT supports function pointers which are preferred over marshalled delegates, as they have better performance and smaller footprint at runtime. Xamarin codebase is in process of fully switching to function pointers.
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@filipnavara noted that there is also a third thunk allocation scheme which could serve the purpose: #81780 (comment) |
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Tagging subscribers to 'os-ios': @steveisok, @akoeplinger Issue DetailsNativeAOT supports marshalled delegates for platforms with hardened runtime by using a scheme of preallocated thunks which is available under the Even though marshalled delegates are considered as a legacy feature, they can still be used in the user's code and even framework libraries (e.g., Xamarin: https://github.com/xamarin/xamarin-macios/blob/main/src/ObjCRuntime/Blocks.cs#L122) which means they have to be supported in some way. As a final note, NativeAOT supports function pointers which are preferred over marshalled delegates, as they have better performance and smaller footprint at runtime. Xamarin codebase is in process of fully switching to function pointers.
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I have a prototype ready, so I would be happy to take a stab at it once the iOS build support lands. |
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Awesome, thanks! Assigning the issue to you then. |
NativeAOT supports marshalled delegates for platforms with hardened runtime by using a scheme of preallocated thunks which is available under the
FEATURE_FIXED_POOL_THUNKSpreprocessor directive. However, it seems the functions used by this scheme are implemented in assembler and are only supported on Windows:runtime/src/coreclr/nativeaot/Runtime/arm64/ThunkPoolThunks.asm
Line 4 in 8d3070f
Even though marshalled delegates are considered as a legacy feature, they can still be used in the user's code and even framework libraries (e.g., Xamarin: https://github.com/xamarin/xamarin-macios/blob/main/src/ObjCRuntime/Blocks.cs#L122) which means they have to be supported in some way.
As a final note, NativeAOT supports function pointers which are preferred over marshalled delegates, as they have better performance and smaller footprint at runtime. Xamarin codebase is in process of fully switching to function pointers: dotnet/macios#10470.
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