[Bug fortran/52102] [OOP] Wrong result with ALLOCATE of CLASS components with array constructor SOURCE-expr

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52102

--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-02-03 13:21:43 UTC ---
>From the dump:

 two.a._data.data = (void * restrict) __builtin_malloc (8);
 __builtin_memset (two.a._data.data, 0, 8);
 two.a._data.offset = -1;
 {
   struct t D.1891;
   D.1891
     = (*(struct t[0:] * restrict) two.a._data.data)[two.a._data.offset + 2];

The "D.1891 = " line looks odd: One should get the address of "two.a._data" and
not the value. Additionally, one gets the address of element "[-1]" which is
invalid.

Also the loop is odd: One iterates through the elements of the SOURCE-expr, but
one always writes to the same dst (here: the temporary variable D.1893):

            while (1)
              {
                if (S.6 > 1) goto L.1;
                {
                  struct t D.1893;

                  D.1893 = (*(struct t[2] * restrict) atmp.1.data)[S.6];
                  __vtab_MAIN___T._copy (&D.1893, &D.1891);


By contrast, for:

  class(t), allocatable :: two(:)
  allocate (two(2), source=[t(4), t(6)])

One has in the loop

   D.1892 = (*(struct t[2] * restrict) atmp.1.data)[S.6];
   __vtab_MAIN___T._copy (&D.1892,
       (struct t *) D.1882
                    + (sizetype) (((S.6 + 1) + D.1883)
                      * (integer(kind=8)) two._vptr->_size));

with
  struct t[0:] * restrict D.1882;
  D.1882 = (struct t[0:] * restrict) two._data.data;