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Re: [PATCH tracing/kprobes v2 1/5] tracing/kprobes: Rename special variables syntax
- From: Frederic Weisbecker <fweisbec at gmail dot com>
- To: Masami Hiramatsu <mhiramat at redhat dot com>
- Cc: Steven Rostedt <rostedt at goodmis dot org>, Ingo Molnar <mingo at elte dot hu>, lkml <linux-kernel at vger dot kernel dot org>, systemtap <systemtap at sources dot redhat dot com>, DLE <dle-develop at lists dot sourceforge dot net>, Thomas Gleixner <tglx at linutronix dot de>, Arnaldo Carvalho de Melo <acme at redhat dot com>, Mike Galbraith <efault at gmx dot de>, Paul Mackerras <paulus at samba dot org>, Peter Zijlstra <a dot p dot zijlstra at chello dot nl>, Christoph Hellwig <hch at infradead dot org>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Jim Keniston <jkenisto at us dot ibm dot com>, "Frank Ch. Eigler" <fche at redhat dot com>
- Date: Mon, 5 Oct 2009 23:11:24 +0200
- Subject: Re: [PATCH tracing/kprobes v2 1/5] tracing/kprobes: Rename special variables syntax
- References: <20091002214834.30906.86502.stgit@dhcp-100-2-132.bos.redhat.com> <20091002214842.30906.49220.stgit@dhcp-100-2-132.bos.redhat.com> <20091003015444.GE4828@nowhere> <4AC830F0.2010003@redhat.com> <4ACA25D5.10703@redhat.com> <20091005192609.GB6071@nowhere> <4ACA5F9C.7020001@redhat.com>
On Mon, Oct 05, 2009 at 05:05:32PM -0400, Masami Hiramatsu wrote:
> 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.
Ah right.
>>> - +|-Offs(ARG)
>>
>> You mean for arg numbers?
>> So we would have +1 for argument 1?
>
> Sorry for confusing you, it is for deref syntax.
Ok :)