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       1                 :            : /* Return DIE at given offset.
       2                 :            :    Copyright (C) 2002-2010, 2017 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 2002.
       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 <string.h>
      35                 :            : #include "libdwP.h"
      36                 :            : 
      37                 :            : 
      38                 :            : Dwarf_Die *
      39                 :            : internal_function
      40                 :      29470 : __libdw_offdie (Dwarf *dbg, Dwarf_Off offset, Dwarf_Die *result,
      41                 :            :                 bool debug_types)
      42                 :            : {
      43         [ +  - ]:      29470 :   if (dbg == NULL)
      44                 :            :     return NULL;
      45                 :            : 
      46                 :      29470 :   Elf_Data *const data = dbg->sectiondata[debug_types ? IDX_debug_types
      47                 :      29470 :                                           : IDX_debug_info];
      48   [ +  -  -  + ]:      29470 :   if (data == NULL || offset >= data->d_size)
      49                 :            :     {
      50                 :          0 :       __libdw_seterrno (DWARF_E_INVALID_DWARF);
      51                 :          0 :       return NULL;
      52                 :            :     }
      53                 :            : 
      54                 :            :   /* Clear the entire DIE structure.  This signals we have not yet
      55                 :            :      determined any of the information.  */
      56                 :      29470 :   memset (result, '\0', sizeof (Dwarf_Die));
      57                 :            : 
      58                 :      29470 :   result->addr = (char *) data->d_buf + offset;
      59                 :            : 
      60                 :            :   /* Get the CU.  */
      61                 :      29470 :   result->cu = __libdw_findcu (dbg, offset, debug_types);
      62         [ -  + ]:      29470 :   if (result->cu == NULL)
      63                 :            :     {
      64                 :            :       /* This should never happen.  The input file is malformed.  */
      65                 :          0 :       __libdw_seterrno (DWARF_E_INVALID_DWARF);
      66                 :          0 :       result = NULL;
      67                 :            :     }
      68                 :            : 
      69                 :            :   return result;
      70                 :            : }
      71                 :            : 
      72                 :            : 
      73                 :            : Dwarf_Die *
      74                 :      16143 : dwarf_offdie (Dwarf *dbg, Dwarf_Off offset, Dwarf_Die *result)
      75                 :            : {
      76                 :      16143 :   return __libdw_offdie (dbg, offset, result, false);
      77                 :            : }
      78                 :            : INTDEF(dwarf_offdie)
      79                 :            : 
      80                 :            : Dwarf_Die *
      81                 :         12 : dwarf_offdie_types (Dwarf *dbg, Dwarf_Off offset, Dwarf_Die *result)
      82                 :            : {
      83                 :         12 :   return __libdw_offdie (dbg, offset, result, true);
      84                 :            : }