> C-constant region of memory? For instance, if we could tell their > memory address is < stack base, and use that to identify them as > constant?
I don't think there is much chance of getting anything like this working portably. > static_strings[7], or something. Then the check is just whether > (some_string >= static_strings[0] && some_string <= > static_strings[max])--if so, it was from a literal (and thus, is > constant). Something like this would be feasible. In fact, if we are going for compile-time tricks, all constant strings (or their "bodies", at least) could be concatenated into a single giant string, and then have another constant array just having the [offset, bytes] pairs. Or, rather, the [offset, bytes, hash] triplets.
