gdb/alphafbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/Alpha.
   2    Copyright 2001 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "value.h"
  23
  24 int
  25 alphafbsd_use_struct_convention (int gcc_p, struct type *type)
  26 {
  27   enum type_code code;
  28   int i;
  29
  30   /* All aggregate types that won't fit in a register must be returned
  31      in memory.  */
  32   if (TYPE_LENGTH (type) > REGISTER_SIZE)
  33     return 1;
  34
  35   /* The only aggregate types that can be returned in a register are
  36      structs and unions.  Arrays must be returned in memory.  */
  37   code = TYPE_CODE (type);
  38   if (code != TYPE_CODE_STRUCT && code != TYPE_CODE_UNION)
  39     return 1;
  40
  41   /* We need to check if this struct/union is "integer" like.  For
  42      this to be true, the offset of each adressable subfield must be
  43      zero.  Note that bit fields are not addressable.  */
  44   for (i = 0; i < TYPE_NFIELDS (type); i++)
  45     {
  46       /* If the field bitsize is non-zero, it isn't adressable.  */
  47       if (TYPE_FIELD_BITPOS (type, i) != 0
  48           && TYPE_FIELD_BITSIZE (type, i) == 0)
  49         return 1;
  50     }
  51
  52   return 0;
  53 }