Rewrite MarshalGeneric<T> to minimize binary size on NativeAOT #1437
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Publishing this, as I think it's in a decent state now and covering almost all scenarios. There's just one unit test that's failing only on .NET Core 3.1 for some reason, @manodasanW if you can I'd love a second pair of eyes on that whenever you have time 😄 |
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Checked with sizoscope, saves ~270 KB already! 🎉
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Saved another 13 KB on .NET 8, maybe a bit more on .NET 9! 🎉
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Saved another 18 KB! 🎉
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manodasanW
reviewed
Jan 18, 2024
manodasanW
approved these changes
Jan 18, 2024
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This PR completely rewrites
MarshalGeneric<T>, to reduce the binary size. Currently there's over 200 KB just in delegate size coming from various generic instantiations for this class alone. Probably much more if we consider all the rest of the code. This PR changes the structure of the class to use a static constructor where we do trimmable type switches and also optimize for lots of well known cases for primitive types and other ABI types that we know will always get constructed. Additionally, I've also introduced a much more compact system of constructing delegates for the various generated methods on the helper types coming from the generated projections, which also skip all those generated closures.Here's what sizoscope is showing on a minimal WinRT component, for reference: