[Bug tapsets/13094] New: caller / ucaller functions based on backtraces

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

http://sourceware.org/bugzilla/show_bug.cgi?id=13094

             Bug #: 13094
           Summary: caller / ucaller functions based on backtraces
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
        AssignedTo: systemtap@sourceware.org
        ReportedBy: fche@redhat.com
    Classification: Unclassified


The current caller* functions in context-unwind.stp are limited to *retprobes.
But based on backtracing, many more places should work; something like:

function caller_n(n) {
     f = backtrace ()
     sym = tokenize(f, " ")
     for (i=1; i<n; i++)
        sym = tokenize("", " ")
     return sym
}

perhaps with some error generation on n-too-large overflow (let the caller
try/catch).

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