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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def state_call(self, addr, *args, **kwargs):
 """ Create a native or a Java call state. :param addr: Soot or native addr of the invoke target. :param args: List of SootArgument values. """

        state = kwargs.pop('base_state', None)
        # check if we need to setup a native or a java callsite
        if isinstance(addr, SootAddressDescriptor):
            # JAVA CALLSITE
            # ret addr precedence: ret_addr kwarg > base_state.addr > terminator
            ret_addr = kwargs.pop('ret_addr', state.addr if state else SootAddressTerminator())
            cc = kwargs.pop('cc', SimCCSoot(self.arch))
            if state is None:
                state = self.state_blank(addr=addr, **kwargs)
            else:
                state = state.copy()
                state.regs.ip = addr
            cc.setup_callsite(state, ret_addr, args)
            return state

        else:
            # NATIVE CALLSITE
            # setup native argument values
            native_arg_values = []
            for arg in args:
                if arg.type in ArchSoot.primitive_types or \
                   arg.type == "JNIEnv":
                    # the value of primitive types and the JNIEnv pointer
                    # are just getting copied into the native memory
                    native_arg_value = arg.value
                    if self.arch.bits == 32 and arg.type == "long":
                        # On 32 bit architecture, long values (w/ 64 bit) are copied
                        # as two 32 bit integer
                        # TODO is this correct?
                        upper = native_arg_value.get_bytes(0, 4)
                        lower = native_arg_value.get_bytes(4, 4)
                        idx = args.index(arg)
                        args = args[:idx] \
                               + (SootArgument(upper, 'int'), SootArgument(lower, 'int')) \
                               + args[idx+1:]
                        native_arg_values += [upper, lower]
                        continue
                else:
                    # argument has a relative type
                    # => map Java reference to an opaque reference, which the native code
                    #    can use to access the Java object through the JNI interface
                    native_arg_value = state.jni_references.create_new_reference(obj=arg.value)
                native_arg_values += [native_arg_value]

            # setup native return type
            ret_type = kwargs.pop('ret_type')
            native_ret_type = self.get_native_type(ret_type)

            # setup function prototype, so the SimCC know how to init the callsite
            arg_types = [self.get_native_type(arg.type) for arg in args]
            prototype = SimTypeFunction(args=arg_types, returnty=native_ret_type)
            native_cc = self.get_native_cc(func_ty=prototype)

            # setup native invoke state
            return self.native_simos.state_call(addr, *native_arg_values,
                                                base_state=state,
                                                ret_addr=self.native_return_hook_addr,
                                                cc=native_cc, **kwargs)