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       14120 : dwarf_getlocation_die (Dwarf_Attribute *attr, const Dwarf_Op *op,
      38             :                        Dwarf_Die *result)
      39             : {
      40       14120 :   if (attr == NULL)
      41             :     return -1;
      42             : 
      43             :   Dwarf_Off dieoff;
      44       14120 :   switch (op->atom)
      45             :     {
      46       13878 :     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       13878 :       dieoff = op->number;
      51       13878 :       break;
      52             : 
      53         235 :     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         235 :       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         235 :       dieoff = attr->cu->start + op->number;
      69         235 :       break;
      70             : 
      71           7 :     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           7 :       if (op->number2 > (attr->cu->end - attr->cu->start))
      76             :         goto invalid_offset;
      77           7 :       dieoff = attr->cu->start + op->number2;
      78           7 :       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       14120 :   if (__libdw_offdie (attr->cu->dbg, dieoff, result,
      90       14120 :                       ISV4TU(attr->cu)) == NULL)
      91             :     return -1;
      92             : 
      93       14120 :   return 0;
      94             : }
      95             : INTDEF(dwarf_getlocation_die);