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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/51514] New: [OOP] Wrong code when passing a CLASS to a TYPE
Date: Mon, 12 Dec 2011 14:57:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51514

             Bug #: 51514
           Summary: [OOP] Wrong code when passing a CLASS to a TYPE
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: burnus@gcc.gnu.org


The following program (subprog_poly_nonpoly_01_pos.f90) of Reinhold Bader's
test suite fails with at run time with:

==17368== Invalid read of size 4
==17368==    at 0x400AB4: MAIN__ (subprog_poly_nonpoly_01_pos.f90:21)
==17368==    by 0x400BCD: main (subprog_poly_nonpoly_01_pos.f90:16)

That's the line:
  if (xx%i == 3) then

The problem is that one passes the CLASS and not the TYPE to the subroutine:
      subpr (&xx);
      if (xx._data->i == 3)
The first line should have been  subpr(&xx._data)

It works with the Intel Compiler 12.1. (See also PR 46990.)


module mod_subpr
  implicit none
  type :: foo
    integer :: i = 2
  end type
  type, extends(foo) :: foo_1
    real :: r(2)
  end type
contains
  subroutine subpr(x)
    type(foo) :: x
    x%i = 3
  end subroutine
end module
program prog
  use mod_subpr
  implicit none
  class(foo), allocatable :: xx
  allocate(foo_1 :: xx)
  call subpr(xx)
  if (xx%i == 3) then
     write(*,*) 'OK'
  else
     write(*,*) 'FAIL'
  end if
end program