[Bug translator/10701] New: $var[i] broken for saving expressions in .return probes

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

Consider

probe kernel.function("unix_stream_recvmsg").return {
  for (i = 0; i < $msg->msg_iovlen; i++)
    len += $msg->msg_iov[i]->iov_len   ## elicits a "read-only `i' warning
  printf("%d", len)
}

The whole "$msg->msg_iov[i]->iov_len" expression appears to be cloned
for saving at synthetic .call time.  However in that context, [i] is
undefined (which makes sense, since at return time we are iterating
over i).

Prior to the implementation of bug #4166, we only had literals as array
indexes, so cloning those into the .call body was not a problem.  Now we
need to decide what to save.  Maybe only the top-level $variable.

Reported By: David Ward <dpward@MIT.EDU>

-- 
           Summary: $var[i] broken for saving expressions in .return probes
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: fche at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10701

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