Associate .dg files to Ada

Associate .dg files to Ada

The .dg files are files containing the user's code, after the GNAT
expander was applied.  The expansion replaces some of the complex
features by simpler pseudo-Ada code and the user can ask to see and
debug that code using the -gnatDG option...

For instance, given the following code where Circle is a tagged type
(aka as a class type in C++):

    procedure Foo is
       My_Shape : Circle := (X => 1, Y => 2, R => 3);
       X : Integer;
    begin
       X := Position_X (My_Shape);
    end Foo;

The expansion results in:

    procedure foo is
       my_shape : pck__circle := (
          _parent => (
             _tag => pck__circleP,
             x => 1,
             y => 2),
          r => 3);
       x : integer;
    begin
       x := pck__position_x (my_shape);
       return;
    end foo;

2010-04-27  Joel Brobecker  <brobecker@adacore.com>

        * symfile.c (init_filename_language_table): Register .dg files
        with language_ada.