[Bug fortran/49475] New: [OOP] Add DWARF info for Fortran's OOP features (extension, member functions)

["burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49475

           Summary: [OOP] Add DWARF info for Fortran's OOP features
                    (extension, member functions)
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: burnus@gcc.gnu.org


We should consider generating DWARF information for Fortran OOP features:

type t
  integer :: a
end type t

type, EXTENDS(t) :: t2
  integer :: b
contains
  procedure :: member_proc => local_proc
end type t2

type (t2) :: x


In this example, x%a and x%t2%a access the component of the parent type.

"member_proc" is a member function, which can be accessed as x%member_proc();
the actual function being called depends on the dynamic type and is determined
via the vtable.


DWARF4 does not really state what should be used in case of Fortran. At
http://www.dwarfstd.org/doc/DWARF4.pdf one finds:
- "5.5.3 Derived or Extended Structs, Classes and Interfaces"
- "5.5.7 Member Function Entries"