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SubjectRe: [PATCH tracing/kprobes v2 1/5] tracing/kprobes: Rename special variables syntax
Frederic Weisbecker wrote:
>> - @global-symbol
> We could use global-symbol as is. Shadowing between global
> and local vars could be dealt with scope resolution:
> function:var
> file:var
> file:line:var
> And throw errors while submitting a shadowed var name, crying until
> the user defines the scope, only if needed of course (if there are
> no shadowing detected, we can submit a naked variable name).

Sure, via perf-probe, global/local symbols will be translated into
@address by debuginfo.
But without debuginfo, we still need @symbol syntax for accessing
global defined symbols.

>> - +|-Offs(ARG)
> You mean for arg numbers?
> So we would have +1 for argument 1?

Sorry for confusing you, it is for deref syntax.

> arg(1) looks more easy to remember and to understand, no?

I think arg(N) seems a bit different from other parts.
Perhaps, %argumentN is possible ? :-)

Thank you,

Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division


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