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You might be surprised to see how quickly mechanically-generated marshaling code adds up. Look at Android's frameworks.jar one day and see how much is just the same AIDL-generated Parcel-manipulation code over and over again. Cache effects and IO costs are so severe in modern computing that my default (but rebuttable!) position is to prefer table-driven approaches over code generation wherever possible.

Windows COM switched from codegen to table-driven "stubless" marshaling decades ago at no noticeable cost to performance and with a huge code size win.