[Bug translator/10943] New: Support generic @entry saving in .return probes

["jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

We already support implicitly saving $target variables at function entry for use
in a .return probe (though bug #5899 debates when ->members should be read). 
There's a good idea in bug #5899 comment #4 to support saving arbitrary
expressions as well.  I quite like the example:

  probe FOO.return { 
    println(gettimeofday_ns() - @entry(gettimeofday_ns()))
  }

This @entry syntax is somewhat distinct from #5899, so I thought it should be
its own bug.

I think our traditional saved_var[tid()] mechanism could be adapted for this
pretty easily.  The newer method using the kretprobe data pouch (bug #5916) is a
little tricker though, as it would need the types to be resolved a bit earlier
than we do now.

-- 
           Summary: Support generic @entry saving in .return probes
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: jistone at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10943

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