def replace_memory_object(self, old, new_content):
        """
        Replaces the memory object `old` with a new memory object containing `new_content`.

        :param old:         A SimMemoryObject (i.e., one from :func:`memory_objects_for_hash()` or :func:`
                            memory_objects_for_name()`).
        :param new_content: The content (claripy expression) for the new memory object.
        :returns: the new memory object
        """

        if old.object.size() != new_content.size():
            raise SimMemoryError("memory objects can only be replaced by the same length content")

        new = SimMemoryObject(new_content, old.base, byte_width=self.byte_width)
        for p in self._containing_pages_mo(old):
            self._get_page(p//self._page_size, write=True).replace_mo(self.state, old, new)

        if isinstance(new.object, claripy.ast.BV):
            for b in range(old.base, old.base+old.length):
                self._update_mappings(b, new.object)
        return new
Replaces the memory object `old` with a new memory object containing `new_content`.

        :param old:         A SimMemoryObject (i.e., one from :func:`memory_objects_for_hash()` or :func:`
                            memory_objects_for_name()`).
        :param new_content: The content (claripy expression) for the new memory object.
        :returns: the new memory object