[Bug fortran/46408] [OOP] Segfault when running gfortran.dg/class_allocate_6.f03
janus at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Sun Jan 2 15:58:00 GMT 2011
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46408
--- Comment #4 from janus at gcc dot gnu.org 2011-01-02 15:58:13 UTC ---
Reduced test case:
type t
end type
type, extends(t) :: t2
integer, allocatable :: a
end type
class(t), allocatable :: x, y
allocate(t2 :: x)
allocate(y, source=x)
end
As far as I can see, the copying routine itself is alright. The problem seems
to be with the default initialization of x%a. From the dump:
MAIN__ ()
{
static struct t __def_init_MAIN___t;
static struct t2 __def_init_MAIN___t2 = {};
static struct __vtype_MAIN___t __vtab_MAIN___t = {._hash=6232021, ._size=0,
._extends=0B, ._def_init=&__def_init_MAIN___t, ._copy=__copy_MAIN___t};
static struct __vtype_MAIN___t2 __vtab_MAIN___t2 = {._hash=43807140,
._size=8, ._extends=&__vtab_MAIN___t, ._def_init=&__def_init_MAIN___t2,
._copy=__copy_MAIN___t2};
static struct __class_MAIN___t_a x = {};
static struct __class_MAIN___t_a y = {};
static void __copy_MAIN___t (struct t & restrict, struct t & restrict);
static void __copy_MAIN___t2 (struct t2 & restrict, struct t2 & restrict);
try
{
x._data = 0B;
y._data = 0B;
! [ ... allocation of x._data ... ]
(void) __builtin_memcpy ((void *) x._data, (void *) x._vptr->_def_init,
(<unnamed-unsigned:64>) x._vptr->_size);
! [ ... allocation of y.data ... ]
x._vptr->_copy (x._data, y._data);
(struct __vtype_MAIN___t *) y._vptr = (struct __vtype_MAIN___t *)
x._vptr;
}
finally
{
[...]
}
}
x%a should get default-initialized to NULL via the memcpy call from
x._vptr->_def_init. The memcpy itself is done alright, but apparently the
_def_init variable is not properly initialized (is it?):
static struct t2 __def_init_MAIN___t2 = {};
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