Line data    Source code

       1             : /* Return associated attribute for DW_OP_GNU_implicit_pointer.
       2             :    Copyright (C) 2010 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 "libdwP.h"
      34             : #include <dwarf.h>
      35             : 
      36             : 
      37             : static unsigned char empty_exprloc = 0;
      38             : static Dwarf_CU empty_cu = { .startp = &empty_exprloc,
      39             :                              .endp = &empty_exprloc + 1 };
      40             : 
      41             : void
      42             : internal_function
      43           0 : __libdw_empty_loc_attr (Dwarf_Attribute *attr)
      44             : {
      45           0 :   attr->code = DW_AT_location;
      46           0 :   attr->form = DW_FORM_exprloc;
      47           0 :   attr->valp = &empty_exprloc;
      48           0 :   attr->cu = &empty_cu;
      49           0 : }
      50             : 
      51             : int
      52           1 : dwarf_getlocation_implicit_pointer (Dwarf_Attribute *attr, const Dwarf_Op *op,
      53             :                                     Dwarf_Attribute *result)
      54             : {
      55           1 :   if (attr == NULL)
      56             :     return -1;
      57             : 
      58           1 :   if (unlikely (op->atom != DW_OP_GNU_implicit_pointer))
      59             :     {
      60           0 :       __libdw_seterrno (DWARF_E_INVALID_ACCESS);
      61           0 :       return -1;
      62             :     }
      63             : 
      64             :   Dwarf_Die die;
      65           1 :   if (__libdw_offdie (attr->cu->dbg, op->number, &die,
      66           1 :                       attr->cu->type_offset != 0) == NULL)
      67             :     return -1;
      68             : 
      69           1 :   if (INTUSE(dwarf_attr) (&die, DW_AT_location, result) == NULL
      70           0 :       && INTUSE(dwarf_attr) (&die, DW_AT_const_value, result) == NULL)
      71             :     {
      72           0 :       __libdw_empty_loc_attr (result);
      73           0 :       return 0;
      74             :     }
      75             : 
      76             :   return 0;
      77             : }