RFC (gdb/mi): -stack-list-locals + PATCH

Nick Roberts nick@nick.uklinux.net
Tue Dec 2 03:14:00 GMT 2003

 > > I don't really know what make_cleanup_ui_out_tuple_begin_end and do_cleanups
 > > do and I've approximated a simple data type to something that isn't
 > > TYPE_CODE_ARRAY or TYPE_CODE_STRUCT so it's probably a pretty gross hack.
 > > 
 > > The idea is that the user can see the value of simple data types immediately
 > > and can create variable objects for complex data types if he wishes to explore
 > > their values in more detail.
 > > 
 > > Any comments?
 > Looks like its time to cleanup "values" changing it to an enum or 
 > bitmask - too many magic numbers.

I see now that I've also inadvertantly defined "-stack-list-arguments 2". I don't
know what magic numbers are but clearly better structure is desirable.

 > Would is_integral_type() give you what you want?

For a simple data type? I don't think so. What about float? Perhaps I'm missing
your point.

 > For the cleanups try the restructured form:
 > 	{
 > 	  struct cleanup = cleanups = make_cleanup (NULL, null_cleanup);
 > 	  ..
 >            do_cleanups (cleanups);
 > 	}
 > http://sources.redhat.com/gdb/current/onlinedocs/gdbint_13.html#SEC112
 > make_cleanup_ui_out_tuple_begin_end opens the tuple and then closes it 
 > via a cleanup (if an error is thrown the tuple under construction is 
 > still finished).

I understand make_cleanup_ui_out_tuple_begin_end but not the above
restructured form. Do I have to call make_cleanup (or relatives) each time I
allocated memory i.e for each call to ui_out_field_stream?

While I'm thinking about the above, here is a basic patch for
mi-cmd-stack.c. Currently if -stack-list-locals is invoked then it gives a
segmentation fault (Segmentation fault (core dumped)). This is inconvenient
and the patch changes this to give an output similar to that of cli:

&"No frame selected.\n"
^error,msg="No frame selected."

    Nick                                         http://www.nick.uklinux.net

*** mi-cmd-stack.c.~1.19.~      2003-06-12 23:29:37.000000000 +0100
--- mi-cmd-stack.c      2003-12-02 02:43:04.000000000 +0000
*** 138,147 ****
--- 138,150 ----
  mi_cmd_stack_list_locals (char *command, char **argv, int argc)
    if (argc != 1)
      error ("mi_cmd_stack_list_locals: Usage: PRINT_VALUES");
+   if (!deprecated_selected_frame)
+     error ("No frame selected.");
    list_args_or_locals (1, atoi (argv[0]), deprecated_selected_frame);
    return MI_CMD_DONE;

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