Branch data     Line data    Source code

       1                 :            : /* Return DIE associated with a location expression op.
       2                 :            :    Copyright (C) 2013, 2017 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            : 
       5                 :            :    This file is free software; you can redistribute it and/or modify
       6                 :            :    it under the terms of either
       7                 :            : 
       8                 :            :      * the GNU Lesser General Public License as published by the Free
       9                 :            :        Software Foundation; either version 3 of the License, or (at
      10                 :            :        your option) any later version
      11                 :            : 
      12                 :            :    or
      13                 :            : 
      14                 :            :      * the GNU General Public License as published by the Free
      15                 :            :        Software Foundation; either version 2 of the License, or (at
      16                 :            :        your option) any later version
      17                 :            : 
      18                 :            :    or both in parallel, as here.
      19                 :            : 
      20                 :            :    elfutils is distributed in the hope that it will be useful, but
      21                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23                 :            :    General Public License for more details.
      24                 :            : 
      25                 :            :    You should have received copies of the GNU General Public License and
      26                 :            :    the GNU Lesser General Public License along with this program.  If
      27                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      28                 :            : 
      29                 :            : #ifdef HAVE_CONFIG_H
      30                 :            : # include <config.h>
      31                 :            : #endif
      32                 :            : 
      33                 :            : #include <dwarf.h>
      34                 :            : #include <libdwP.h>
      35                 :            : 
      36                 :            : int
      37                 :      14934 : dwarf_getlocation_die (Dwarf_Attribute *attr, const Dwarf_Op *op,
      38                 :            :                        Dwarf_Die *result)
      39                 :            : {
      40         [ -  + ]:      14934 :   if (attr == NULL)
      41                 :            :     return -1;
      42                 :            : 
      43                 :      14934 :   Dwarf_Off dieoff;
      44   [ +  +  +  -  :      14934 :   switch (op->atom)
                      - ]
      45                 :            :     {
      46                 :      14504 :     case DW_OP_implicit_pointer:
      47                 :            :     case DW_OP_GNU_implicit_pointer:
      48                 :            :     case DW_OP_call_ref:
      49                 :            :     case DW_OP_GNU_variable_value:
      50                 :      14504 :       dieoff = op->number;
      51                 :      14504 :       break;
      52                 :            : 
      53                 :        428 :     case DW_OP_GNU_parameter_ref:
      54                 :            :     case DW_OP_convert:
      55                 :            :     case DW_OP_GNU_convert:
      56                 :            :     case DW_OP_reinterpret:
      57                 :            :     case DW_OP_GNU_reinterpret:
      58                 :            :     case DW_OP_const_type:
      59                 :            :     case DW_OP_GNU_const_type:
      60                 :            :     case DW_OP_call2:
      61                 :            :     case DW_OP_call4:
      62         [ -  + ]:        428 :       if (op->number > (attr->cu->end - attr->cu->start))
      63                 :            :         {
      64                 :          0 :         invalid_offset:
      65                 :          0 :           __libdw_seterrno (DWARF_E_INVALID_OFFSET);
      66                 :          0 :           return -1;
      67                 :            :         }
      68                 :        428 :       dieoff = attr->cu->start + op->number;
      69                 :        428 :       break;
      70                 :            : 
      71                 :          2 :     case DW_OP_regval_type:
      72                 :            :     case DW_OP_GNU_regval_type:
      73                 :            :     case DW_OP_deref_type:
      74                 :            :     case DW_OP_GNU_deref_type:
      75         [ -  + ]:          2 :       if (op->number2 > (attr->cu->end - attr->cu->start))
      76                 :          0 :         goto invalid_offset;
      77                 :          2 :       dieoff = attr->cu->start + op->number2;
      78                 :          2 :       break;
      79                 :            : 
      80                 :          0 :     case DW_OP_xderef_type:
      81                 :          0 :       dieoff = op->number2;
      82                 :          0 :       break;
      83                 :            : 
      84                 :          0 :     default:
      85                 :          0 :       __libdw_seterrno (DWARF_E_INVALID_ACCESS);
      86                 :          0 :       return -1;
      87                 :            :     }
      88                 :            : 
      89         [ -  + ]:      14934 :   if (__libdw_offdie (attr->cu->dbg, dieoff, result,
      90   [ +  +  +  - ]:      14934 :                       ISV4TU(attr->cu)) == NULL)
      91                 :            :     return -1;
      92                 :            : 
      93                 :            :   return 0;
      94                 :            : }
      95                 :            : INTDEF(dwarf_getlocation_die);