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E.g. if you have self-modifying code, you need an emulator by definition. And even without self-modifying code, you still need to identify all function entry points somehow. And differentiate code from data. And then you can't find and fix all function pointers.
If you really try to do this "statically", you devolve into mountains of bookkeeping bullshit that makes it all slower than a JIT emulator.
