> We want to be able to treat such things as invariant somehow even if we > can't do that for references to user data that might be changed by > intervening code. > > That is, indicate that we know that the _REF actually refers to a const > variable or is otherwise known to be unchanging. > > Perhaps that should be a new flag that tree_invariant_p can check > instead of TREE_READONLY.
Richard earlier suggested a langhook; given that Ada will be the main (sole?) user of it, this would probably be better. -- Eric Botcazou
