[Bug breakpoints/15314] New: Why does this error exist? "Cannot find bounds of current function"

["dje at google dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15314

             Bug #: 15314
           Summary: Why does this error exist?  "Cannot find bounds of
                    current function"
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
        AssignedTo: unassigned@sourceware.org
        ReportedBy: dje@google.com
    Classification: Unclassified


gdb has this code in infcmd.c:

          /* If we have no line info, switch to stepi mode.  */
          if (tp->control.step_range_end == 0 && step_stop_if_no_debug)
            tp->control.step_range_start = tp->control.step_range_end = 1;
          else if (tp->control.step_range_end == 0)
            {
              const char *name;

              if (find_pc_partial_function (pc, &name,
                                            &tp->control.step_range_start,
                                            &tp->control.step_range_end) == 0)
                error (_("Cannot find bounds of current function"));

              target_terminal_ours ();
              printf_filtered (_("Single stepping until exit from function %s,"
                                 "\nwhich has no line number information.\n"),
                               name);
            }

Is there a reason to throw an error instead of just printing a message and
returning control back to the user? Or, maybe - I didn't dig deeper, set name
to "<unknown>" or some such if find_pc_partial_function fails.
[I also didn't dig deeper to see if taking a step back and reworking this code
would be better.]

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