From: Andrew Cagney <cagney@redhat.com>
To: Petr Machata <pmachata@redhat.com>
Cc: frysk@sourceware.org
Subject: Re: Shortcomings of HPD '#' identifier qualification syntax
Date: Tue, 08 Apr 2008 13:45:00 -0000 [thread overview]
Message-ID: <47FB7039.3000304@redhat.com> (raw)
In-Reply-To: <20080406073643.GB14265@hridell.englab.brq.redhat.com>
Sami and I were brainstorming some #-parsing vs lexing problems friday
We came up with a rough rule of thumb that given a #, everything until
until a space (and a finite small set of characters) would be included
in the token. Without this something like:
(fhpd) print #libc#environ + #libc.co#errno
would not end how you'd expect. Similarly, this gives us a way to
handle the "." in
(fhpd) print #solib#astruct .member
(fhpd) print #solib#afile.c#10
The consequence is that extra tokens such as "@" and ":" can be made to
work.
Andrew
Petr Machata wrote:
> HPD syntax misses certain features that I'd like to use in ftrace (and
> who knows, maybe fhpd users would appreciate them, too). So here goes
> my bikeshed problem:
>
> 1) You can't specify ELF symbol version,
> 2) You can't specify PLT entry
>
> Number 1 can be solved by simply allowing the symbol name to have a form
> of "symbolname@version". "@" is good for that purpose, because it's
> non-ambiguous, and already used by readelf to refer to symbol versions.
>
>
i noticed, will help with cut/paste.
> Number 2 can be resolved in any number of ways. In ftrace, I currently
> output traced PLT entries like "#soname#plt:symbolname". This looks
> nice, seems to be easy to remember, but would be hard to parse in the
> context of ?: ternary expression. objdump uses notation of the form of
> "symbol@PLT", which would collide with symbol version syntax. Maybe
> something along the lines of ".plt:symbol"?
>
> Opinions? Ideas?
>
> PM
>
next prev parent reply other threads:[~2008-04-08 13:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-07 2:06 Petr Machata
2008-04-08 13:45 ` Andrew Cagney [this message]
2008-04-08 14:56 ` Petr Machata
2008-04-28 11:55 ` Sami Wagiaalla
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