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       1                 :            : /* Return reference offset represented by attribute.
       2                 :            :    Copyright (C) 2003-2010 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 2003.
       5                 :            : 
       6                 :            :    This file is free software; you can redistribute it and/or modify
       7                 :            :    it under the terms of either
       8                 :            : 
       9                 :            :      * the GNU Lesser General Public License as published by the Free
      10                 :            :        Software Foundation; either version 3 of the License, or (at
      11                 :            :        your option) any later version
      12                 :            : 
      13                 :            :    or
      14                 :            : 
      15                 :            :      * the GNU General Public License as published by the Free
      16                 :            :        Software Foundation; either version 2 of the License, or (at
      17                 :            :        your option) any later version
      18                 :            : 
      19                 :            :    or both in parallel, as here.
      20                 :            : 
      21                 :            :    elfutils is distributed in the hope that it will be useful, but
      22                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24                 :            :    General Public License for more details.
      25                 :            : 
      26                 :            :    You should have received copies of the GNU General Public License and
      27                 :            :    the GNU Lesser General Public License along with this program.  If
      28                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      29                 :            : 
      30                 :            : #ifdef HAVE_CONFIG_H
      31                 :            : # include <config.h>
      32                 :            : #endif
      33                 :            : 
      34                 :            : #include <dwarf.h>
      35                 :            : #include "libdwP.h"
      36                 :            : 
      37                 :            : int
      38                 :    1512982 : __libdw_formref (attr, return_offset)
      39                 :            :      Dwarf_Attribute *attr;
      40                 :            :      Dwarf_Off *return_offset;
      41                 :            : {
      42                 :            :   const unsigned char *datap;
      43                 :            : 
      44         [ -  + ]:    1512982 :   if (attr->valp == NULL)
      45                 :            :     {
      46                 :          0 :       __libdw_seterrno (DWARF_E_INVALID_REFERENCE);
      47                 :            :       return -1;
      48                 :            :     }
      49                 :            : 
      50   [ -  -  +  -  :    1512982 :   switch (attr->form)
                +  -  - ]
      51                 :            :     {
      52                 :            :     case DW_FORM_ref1:
      53                 :          0 :       *return_offset = *attr->valp;
      54                 :          0 :       break;
      55                 :            : 
      56                 :            :     case DW_FORM_ref2:
      57 [ #  # ][ #  # ]:          0 :       *return_offset = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
      58                 :          0 :       break;
      59                 :            : 
      60                 :            :     case DW_FORM_ref4:
      61 [ +  + ][ -  + ]:    1512977 :       *return_offset = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
      62                 :    1512977 :       break;
      63                 :            : 
      64                 :            :     case DW_FORM_ref8:
      65 [ #  # ][ #  # ]:          0 :       *return_offset = read_8ubyte_unaligned (attr->cu->dbg, attr->valp);
      66                 :          0 :       break;
      67                 :            : 
      68                 :            :     case DW_FORM_ref_udata:
      69                 :          5 :       datap = attr->valp;
      70         [ -  + ]:          5 :       get_uleb128 (*return_offset, datap);
      71                 :            :       break;
      72                 :            : 
      73                 :            :     case DW_FORM_ref_addr:
      74                 :            :     case DW_FORM_ref_sig8:
      75                 :            :     case DW_FORM_GNU_ref_alt:
      76                 :            :       /* These aren't handled by dwarf_formref, only by dwarf_formref_die.  */
      77                 :          0 :       __libdw_seterrno (DWARF_E_INVALID_REFERENCE);
      78                 :            :       return -1;
      79                 :            : 
      80                 :            :     default:
      81                 :    1512982 :       __libdw_seterrno (DWARF_E_NO_REFERENCE);
      82                 :            :       return -1;
      83                 :            :     }
      84                 :            : 
      85                 :            :   return 0;
      86                 :            : }
      87                 :            : 
      88                 :            : /* This is the old public entry point.
      89                 :            :    It is now deprecated in favor of dwarf_formref_die.  */
      90                 :            : int
      91                 :          0 : dwarf_formref (attr, return_offset)
      92                 :            :      Dwarf_Attribute *attr;
      93                 :            :      Dwarf_Off *return_offset;
      94                 :            : {
      95         [ #  # ]:          0 :   if (attr == NULL)
      96                 :            :     return -1;
      97                 :            : 
      98                 :          0 :   return __libdw_formref (attr, return_offset);
      99                 :            : }