Stop the Insanity! Linespec Rewrite

[Keith Seitz]

On 03/02/2012 08:59 AM, Tom Tromey wrote:
> Keith>  o We now have a (trivial) parser and a lexer. The lexer "word" breaks
> Keith>  the input on ':', but it does know about "::" as a scope operator for
> Keith>  C++ (but nothing on ObjC).
>
>  From reading the code I had a feeling that a leading ":" wasn't handled
> properly.  So I tried it, and `b ::foo' causes an internal error.

Doh! I can't believe there is no existing test for that! In any case,
I've got a patch for that.

> A couple other notes -
>
> linespec_parse_line_offset only allows decimal but the lexer allows hex.
> But why bother with hex?

That's a cleanup. I implemented that a loooong time ago, well, just 
because I could. I'll remove that during the cleanup phase (along with 
several other unnecessary things).

> I noticed the code is missing 'const' in a number of places.

I'll fix those.

> Keith>  For example, you cannot do: "break
> Keith>  klass::'operator +'" anymore.
>
> What is the issue with this one?

Not much, really. I could probably implement something to do it, but I 
really view this whole quoting issue as a workaround for bugs in the old 
linespec.c We don't/shouldn't really need that from here on out.

Let me know if you want me to add that back in.

> I saw the WHATS_THIS_FOR.  I'm not sure what it is for, but on some
> platforms a symbol can start with "$", so maybe it is handling that
> case.  You can maybe construct one with gcc -fdollars-in-identifiers.

I'll play with that and see if I can trigger this.

Thank you for taking a look!

Keith