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Subject: [Bug fortran/47565] [4.6 Regression][OOP] Segfault with TBP
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47565

janus at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.02.01 13:00:47
     Ever Confirmed|0                           |1

--- Comment #1 from janus at gcc dot gnu.org 2011-02-01 13:00:47 UTC ---
Modified test case:


module class_t
contains
  function find_y() result(res)
    integer, allocatable :: res
    print *,"find_y"
    allocate(res)
  end function
end module

program p
  use class_t
  type :: t
    procedure(find_y), pointer, nopass :: ppc
  contains
    procedure, nopass :: find_y
  end type
  class(t), allocatable :: this
  integer :: y

  allocate(this)
  this%ppc => find_y
  ! (1) ordinary procedure (works)
  y = find_y()
  print *, y
  ! (2) procedure pointer component (works)
  y = this%ppc()
  print *, y
  ! (3) type-bound procedure (fails)
  y = this%find_y()  ! segfault at run time
  print *, y
end 


This shows that the PPC call also works nicely, while the TBP does not.
The dump for all three calls looks ok:

      y = *find_y ();
      y = *this._data->ppc ();
      y = *this._vptr->find_y ();

The problem seems to be that the initialization for the TBP is missing in the
vtab:

  static struct __vtype_p_T __vtab_p_T = {._hash=31520549, ._size=8,
._extends=0B, ._def_init=&__def_init_p_T, ._copy=__copy_p_T};

When removing the allocatable attribute of 'find_y', one correctly gets:

  static struct __vtype_p_T __vtab_p_T = {._hash=31520549, ._size=8,
._extends=0B, ._def_init=&__def_init_p_T, ._copy=__copy_p_T, .find_y=find_y};