Shortcomings of HPD '#' identifier qualification syntax

[Petr Machata <pmachata at redhat dot com>]

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.

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

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