def compares_by_identity(w_self):
from pypy.objspace.descroperation import object_hash, type_eq
if not w_self.space.config.objspace.std.withidentitydict:
return False # conservative
#
if w_self.compares_by_identity_status != UNKNOWN:
# fast path
return w_self.compares_by_identity_status == COMPARES_BY_IDENTITY
#
default_hash = object_hash(w_self.space)
my_eq = w_self.lookup('__eq__')
overrides_eq = (my_eq and my_eq is not type_eq(w_self.space))
overrides_eq_cmp_or_hash = (overrides_eq or
w_self.lookup('__hash__') is not default_hash)
if overrides_eq_cmp_or_hash:
w_self.compares_by_identity_status = OVERRIDES_EQ_CMP_OR_HASH
else:
w_self.compares_by_identity_status = COMPARES_BY_IDENTITY
return w_self.compares_by_identity_status == COMPARES_BY_IDENTITY
