[Bug java/26042] ICE in mark_reference_fields, at java/boehm.c:105

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

------- Comment #9 from tromey at gcc dot gnu dot org  2006-03-29 15:12 -------
The first time we lay out the type, we have the fields reversed.
See parse.y:java_reorder_fields.  I don't know why this happens.
(We construct the field list in reverse order, presumably for
efficiency.  What is unclear is why the type can be laid out
before the fields are correctly ordered.)

In any case, on ppc32, the ordering of fields matters, because
the class One can be packed more efficiently if 'b' comes first.

Then what happens is that when we lay out Two$Three, the initial
size of One is used to lay out the super class field.  This field's
size is not recomputed the second time we lay out Two$Three, yielding
the incorrect result.

One possible fix would be to reset the field sizes when we null out
TYPE_SIZE in java_reorder_fields (and perhaps elsewhere).

A better fix might be to remove the need for reordering fields.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26042