gdb/gdb_bfd.c

   1 /* Definitions for BFD wrappers used by GDB.
   2
   3    Copyright (C) 2011
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "gdb_bfd.h"
  23 #include "gdb_assert.h"
  24
  25 /* Close ABFD, and warn if that fails.  */
  26
  27 static int
  28 gdb_bfd_close_or_warn (struct bfd *abfd)
  29 {
  30   int ret;
  31   char *name = bfd_get_filename (abfd);
  32
  33   ret = bfd_close (abfd);
  34
  35   if (!ret)
  36     warning (_("cannot close \"%s\": %s"),
  37              name, bfd_errmsg (bfd_get_error ()));
  38
  39   return ret;
  40 }
  41
  42 /* Add reference to ABFD.  Returns ABFD.  */
  43
  44 struct bfd *
  45 gdb_bfd_ref (struct bfd *abfd)
  46 {
  47   int *p_refcount;
  48
  49   if (abfd == NULL)
  50     return NULL;
  51
  52   p_refcount = bfd_usrdata (abfd);
  53
  54   if (p_refcount != NULL)
  55     {
  56       *p_refcount += 1;
  57       return abfd;
  58     }
  59
  60   p_refcount = xmalloc (sizeof (*p_refcount));
  61   *p_refcount = 1;
  62   bfd_usrdata (abfd) = p_refcount;
  63
  64   return abfd;
  65 }
  66
  67 /* Unreference and possibly close ABFD.  */
  68
  69 void
  70 gdb_bfd_unref (struct bfd *abfd)
  71 {
  72   int *p_refcount;
  73   char *name;
  74
  75   if (abfd == NULL)
  76     return;
  77
  78   p_refcount = bfd_usrdata (abfd);
  79   gdb_assert (*p_refcount >= 1);
  80
  81   *p_refcount -= 1;
  82   if (*p_refcount > 0)
  83     return;
  84
  85   xfree (p_refcount);
  86   bfd_usrdata (abfd) = NULL;  /* Paranoia.  */
  87
  88   name = bfd_get_filename (abfd);
  89   gdb_bfd_close_or_warn (abfd);
  90 }