code: def _generate_gen_variable_decl(self, tp, name):
      if isinstance(tp, model.ArrayType):
          if tp.length_is_unknown():
              prnt = self._prnt
              funcname = "_cffi_sizeof_%s" % (name,)
              self.export_symbols.append(funcname)
              prnt("size_t %s(void)" % funcname)
              prnt("{")
              prnt("  return sizeof(%s);" % (name,))
              prnt("}")
          tp_ptr = model.PointerType(tp.item)
          self._generate_gen_const(False, name, tp_ptr)
      else:
          tp_ptr = model.PointerType(tp)
          self._generate_gen_const(False, name, tp_ptr, category="var")
  
imports: import sys, os
  import types
  from .None import model
  from .error import VerificationError
label_desc: Use image node_id 40 for calling the VGenericEngine obj's underlying member method code with example usage: obj._generate_gen_variable_decl(tp, name) without return types