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

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

[dje at google dot com]

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

[palves at redhat dot com]

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

Pedro Alves <palves at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |palves at redhat dot com

--- Comment #1 from Pedro Alves <palves at redhat dot com> 2013-03-27 18:08:01 UTC ---
It's not about the name -- it's about the step range.
That is, what find_pc_partial_function ends up in
step_range_start/step_range_end.

Another alternative would be to switch to si mode, like with there's no line
info.

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

[dje at google dot com]

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

--- Comment #2 from dje at google dot com 2013-03-27 18:10:32 UTC ---
Ah.  The point is throwing an error seems wrong.

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