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Useful snippets:

Printing a function pointer:

auto vtable_func_int =
    builder_.CreatePtrToInt(vtable_func, builder_.getInt32Ty());
builder_.CreateCall(
    GetLlvmFunction("IO", "out_int"),
    {llvm::ConstantPointerNull::get(GetLlvmClassType("IO")->getPointerTo()),
     vtable_func_int});