def add_const(self, w_obj):
"""Add a W_Root to the constant array and return its location."""
space = self.space
if isinstance(w_obj, PyCode):
# unlike CPython, never share code objects, it's pointless
w_key = space.id(w_obj)
else:
w_key = PyCode.const_comparison_key(self.space, w_obj)
w_len = space.finditem(self.w_consts, w_key)
if w_len is not None:
length = space.int_w(w_len)
else:
length = len(self.consts_w)
w_obj = misc.intern_if_common_string(space, w_obj)
self.consts_w.append(w_obj)
space.setitem(self.w_consts, w_key, space.newint(length))
if length == 0:
self.scope.doc_removable = False
return length
