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       1                 :            : /* Return signed constant represented by attribute.
       2                 :            :    Copyright (C) 2003, 2005, 2014, 2017 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                 :        321 : dwarf_formsdata (Dwarf_Attribute *attr, Dwarf_Sword *return_sval)
      40                 :            : {
      41         [ +  - ]:        321 :   if (attr == NULL)
      42                 :            :     return -1;
      43                 :            : 
      44                 :        321 :   const unsigned char *datap = attr->valp;
      45                 :        321 :   const unsigned char *endp = attr->cu->endp;
      46                 :            : 
      47   [ +  +  -  -  :        321 :   switch (attr->form)
             +  -  +  - ]
      48                 :            :     {
      49                 :        293 :     case DW_FORM_data1:
      50         [ -  + ]:        293 :       if (datap + 1 > endp)
      51                 :            :         {
      52                 :          0 :         invalid:
      53                 :          0 :           __libdw_seterrno (DWARF_E_INVALID_DWARF);
      54                 :          0 :           return -1;
      55                 :            :         }
      56                 :        293 :       *return_sval = (signed char) *attr->valp;
      57                 :        293 :       break;
      58                 :            : 
      59                 :          1 :     case DW_FORM_data2:
      60         [ -  + ]:          1 :       if (datap + 2 > endp)
      61                 :          0 :         goto invalid;
      62         [ -  + ]:          1 :       *return_sval = read_2sbyte_unaligned (attr->cu->dbg, attr->valp);
      63                 :          1 :       break;
      64                 :            : 
      65                 :          0 :     case DW_FORM_data4:
      66         [ #  # ]:          0 :       if (datap + 4 > endp)
      67                 :          0 :         goto invalid;
      68         [ #  # ]:          0 :       *return_sval = read_4sbyte_unaligned (attr->cu->dbg, attr->valp);
      69                 :          0 :       break;
      70                 :            : 
      71                 :          0 :     case DW_FORM_data8:
      72         [ #  # ]:          0 :       if (datap + 8 > endp)
      73                 :          0 :         goto invalid;
      74         [ #  # ]:          0 :       *return_sval = read_8sbyte_unaligned (attr->cu->dbg, attr->valp);
      75                 :          0 :       break;
      76                 :            : 
      77                 :         10 :     case DW_FORM_sdata:
      78         [ -  + ]:         10 :       if (datap + 1 > endp)
      79                 :          0 :         goto invalid;
      80                 :         10 :       get_sleb128 (*return_sval, datap, endp);
      81                 :         10 :       break;
      82                 :            : 
      83                 :          0 :     case DW_FORM_udata:
      84         [ #  # ]:          0 :       if (datap + 1 > endp)
      85                 :          0 :         goto invalid;
      86                 :          0 :       get_uleb128 (*return_sval, datap, endp);
      87                 :          0 :       break;
      88                 :            : 
      89                 :         17 :     case DW_FORM_implicit_const:
      90                 :            :       // The data comes from the abbrev, which has been bounds checked.
      91                 :         17 :       get_sleb128_unchecked (*return_sval, datap);
      92                 :         17 :       break;
      93                 :            : 
      94                 :          0 :     default:
      95                 :          0 :       __libdw_seterrno (DWARF_E_NO_CONSTANT);
      96                 :          0 :       return -1;
      97                 :            :     }
      98                 :            : 
      99                 :            :   return 0;
     100                 :            : }
     101                 :            : INTDEF(dwarf_formsdata)