[Retr0id]

It already does, in the form of JIT compilation.

[alcover]

OK but I meant in already native code, like in a C program - no bytecode.

[lmm]

If you are generating or modifying code at runtime then how is that different from bytecode? Standardised bytecodes and JITs are just an organised way of doing the same thing.

[connicpu]

LuaJIT has a wonderful dynamic code generation system in the form of the DynASM[1] library. You can use it separately from LuaJIT for dynamic runtime code generation to create machine code optimized for a particular problem.

[1]: https://luajit.org/dynasm.html

[Retr0id]

I mean that, too.