'Add a new definition for variable and kill all previous definitions.
:param SimVariable variable: The variable to kill.
:param CodeLocation location: The location where this variable is defined.
:param int size_threshold: The maximum bytes to consider for the variable.
:return: None'

def kill_def(self, variable, location, size_threshold=32):

    if isinstance(variable, SimRegisterVariable):
        if (variable.reg is None):
            l.warning('kill_def:    Got    a    None    for    a    SimRegisterVariable.    Consider    fixing.')
            return None
        size = min(variable.size, size_threshold)
        offset = variable.reg
        while (offset < (variable.reg + size)):
            self._register_map[offset] = {location}
            offset += 1
        self._defs[variable] = {location}
    elif isinstance(variable, SimMemoryVariable):
        size = min(variable.size, size_threshold)
        offset = variable.addr
        while (offset < (variable.addr + size)):
            self._memory_map[offset] = {location}
            offset += 1
        self._defs[variable] = {location}
    else:
        l.error('Unsupported    variable    type    "%s".', type(variable))
