Line data    Source code

       1             : /* Return reference offset represented by attribute.
       2             :    Copyright (C) 2003-2010, 2014 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             : internal_function
      39     1314299 : __libdw_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset)
      40             : {
      41     1314299 :   const unsigned char *datap = attr->valp;
      42     1314299 :   const unsigned char *endp = attr->cu->endp;
      43             : 
      44     1314299 :   if (attr->valp == NULL)
      45             :     {
      46           0 :       __libdw_seterrno (DWARF_E_INVALID_REFERENCE);
      47           0 :       return -1;
      48             :     }
      49             : 
      50     1314299 :   switch (attr->form)
      51             :     {
      52             :     case DW_FORM_ref1:
      53        1242 :       if (datap + 1 > endp)
      54             :         {
      55             :         invalid:
      56           0 :           __libdw_seterrno (DWARF_E_INVALID_DWARF);
      57           0 :           return -1;
      58             :         }
      59        1242 :       *return_offset = *attr->valp;
      60        1242 :       break;
      61             : 
      62             :     case DW_FORM_ref2:
      63        5605 :       if (datap + 2 > endp)
      64             :         goto invalid;
      65        5605 :       *return_offset = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
      66        5605 :       break;
      67             : 
      68             :     case DW_FORM_ref4:
      69     1289460 :       if (datap + 4 > endp)
      70             :         goto invalid;
      71     1336575 :       *return_offset = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
      72     1289460 :       break;
      73             : 
      74             :     case DW_FORM_ref8:
      75           0 :       if (datap + 8 > endp)
      76             :         goto invalid;
      77           0 :       *return_offset = read_8ubyte_unaligned (attr->cu->dbg, attr->valp);
      78           0 :       break;
      79             : 
      80             :     case DW_FORM_ref_udata:
      81       17992 :       if (datap + 1 > endp)
      82             :         goto invalid;
      83       17992 :       get_uleb128 (*return_offset, datap, endp);
      84       17992 :       break;
      85             : 
      86             :     case DW_FORM_ref_addr:
      87             :     case DW_FORM_ref_sig8:
      88             :     case DW_FORM_GNU_ref_alt:
      89             :       /* These aren't handled by dwarf_formref, only by dwarf_formref_die.  */
      90           0 :       __libdw_seterrno (DWARF_E_INVALID_REFERENCE);
      91           0 :       return -1;
      92             : 
      93             :     default:
      94           0 :       __libdw_seterrno (DWARF_E_NO_REFERENCE);
      95           0 :       return -1;
      96             :     }
      97             : 
      98             :   return 0;
      99             : }
     100             : 
     101             : /* This is the old public entry point.
     102             :    It is now deprecated in favor of dwarf_formref_die.  */
     103             : int
     104           0 : dwarf_formref (Dwarf_Attribute *attr, Dwarf_Off *return_offset)
     105             : {
     106           0 :   if (attr == NULL)
     107             :     return -1;
     108             : 
     109           0 :   return __libdw_formref (attr, return_offset);
     110             : }