Chris Lattner wrote:- > > On Dec 27, 2007, at 12:11 PM, Chris Lattner wrote: > >> (Why is it a good idea to treat stuff like @try as two tokens > >> instead of one?) > > > > The answer is that thing like @ /*comment*/ try are legal, sadly > > enough. However, it seems that we could probably do something in > > the lexer (when it sees the "@", to handle this. I'll see what I > > can do about this when I have time. > > Okay, so it's quite possible to hack the lexer to merge these into two > tokens. The problem with this is that it would lose the location info > of the two pieces. I'd prefer to keep the lexer pure, and have it > return perfect location info. This allows the client (eventually sema > in this case) throw away loc info it doesn't need, but allows other > clients to use it (e.g. -E mode). > > This means we're stuck with the parser having to handle these as two > tokens, sorry.
Moreover I distinctly remember the justification for two tokens was to enable macro expansion of the second part; this was a specific requirement Apple (Stan) had. Neil. _______________________________________________ cfe-dev mailing list [email protected] http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
