Line data    Source code

       1             : /* Return signed constant represented by attribute.
       2             :    Copyright (C) 2003, 2005, 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             : 
      38             : int
      39        1219 : dwarf_formsdata (Dwarf_Attribute *attr, Dwarf_Sword *return_sval)
      40             : {
      41        1219 :   if (attr == NULL)
      42             :     return -1;
      43             : 
      44        1219 :   const unsigned char *datap = attr->valp;
      45        1219 :   const unsigned char *endp = attr->cu->endp;
      46             : 
      47        1219 :   switch (attr->form)
      48             :     {
      49             :     case DW_FORM_data1:
      50          12 :       if (datap + 1 > endp)
      51             :         {
      52             :         invalid:
      53           0 :           __libdw_seterrno (DWARF_E_INVALID_DWARF);
      54           0 :           return -1;
      55             :         }
      56          12 :       *return_sval = *attr->valp;
      57          12 :       break;
      58             : 
      59             :     case DW_FORM_data2:
      60           0 :       if (datap + 2 > endp)
      61             :         goto invalid;
      62           0 :       *return_sval = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
      63           0 :       break;
      64             : 
      65             :     case DW_FORM_data4:
      66           0 :       if (datap + 4 > endp)
      67             :         goto invalid;
      68           0 :       *return_sval = read_4ubyte_unaligned (attr->cu->dbg, attr->valp);
      69           0 :       break;
      70             : 
      71             :     case DW_FORM_data8:
      72           0 :       if (datap + 8 > endp)
      73             :         goto invalid;
      74           0 :       *return_sval = read_8ubyte_unaligned (attr->cu->dbg, attr->valp);
      75           0 :       break;
      76             : 
      77             :     case DW_FORM_sdata:
      78        1207 :       if (datap + 1 > endp)
      79             :         goto invalid;
      80        1207 :       get_sleb128 (*return_sval, datap, endp);
      81        1207 :       break;
      82             : 
      83             :     case DW_FORM_udata:
      84           0 :       if (datap + 1 > endp)
      85             :         goto invalid;
      86           0 :       get_uleb128 (*return_sval, datap, endp);
      87           0 :       break;
      88             : 
      89             :     default:
      90           0 :       __libdw_seterrno (DWARF_E_NO_CONSTANT);
      91           0 :       return -1;
      92             :     }
      93             : 
      94             :   return 0;
      95             : }
      96             : INTDEF(dwarf_formsdata)