Re: Where would you start debugging?

["G.B." <rm-dash-bau-haus@dash.futureapps.de>]

On 27.06.13 15:53, Peter Brooks wrote:
> I've written a small package, there's not much point in putting it here. The moment I run it it is giving me this error:
>
> raised CONSTRAINT_ERROR : erroneous memory access
>
> I'm using gnat on a Mac. The odd thing is that this happens when the calling program simply has a 'with' statement mentioning the package, there's no need to call it.
>
> So, it's clearly part of the iniitalisation of the package.
>
> Where should I start debugging?

If the with-ed package is yours, -gnatVa, -gnatwa, -fstack-check,
and -gnato could help as they add more checks and warnings.
-gnatE and -gnata might also help.

In case the with-ed package is from the run-time system or similar,
I'd add GNAT switches -x, -a, and possibly -m to the above.

Before starting gdb, I'd try a tool like valgrind (of which XCode
has an equivalent IIRC.)

>  should I forget this method and just parse the string manually?

Will 'Value do?

    type Enum is (Yeah, Bee, See);

    ...

    declare
       use Ada.Command_Line;
       Test : Enum;
    begin
       Test := Enum'Value (Argument (1));
       Text_IO.Put_Line (Natural'Image (Enum'Pos (Test)));
    exception
       when Constraint_Error =>
          -- ...
    end;