Line data    Source code

       1             : /* Iterate through the CU units for a given Dwarf.
       2             :    Copyright (C) 2016, 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             : 
      30             : #ifdef HAVE_CONFIG_H
      31             : # include <config.h>
      32             : #endif
      33             : 
      34             : #include <string.h>
      35             : 
      36             : #include "libdwP.h"
      37             : 
      38             : int
      39        9710 : dwarf_get_units (Dwarf *dwarf, Dwarf_CU *cu, Dwarf_CU **next_cu,
      40             :                  Dwarf_Half *version, uint8_t *unit_type,
      41             :                  Dwarf_Die *cudie, Dwarf_Die *subdie)
      42             : {
      43             :   /* Handle existing error.  */
      44        9710 :   if (dwarf == NULL)
      45             :     return -1;
      46             : 
      47        9710 :   Dwarf_Off off;
      48        9710 :   bool v4type;
      49        9710 :   if (cu == NULL)
      50             :     {
      51             :       off = 0;
      52             :       v4type = false;
      53             :     }
      54             :   else
      55             :     {
      56        7456 :       off = cu->end;
      57        7456 :       v4type = cu->sec_idx != IDX_debug_info;
      58             : 
      59             :       /* Make sure we got a real (not fake) CU.  */
      60        7456 :       if (cu->sec_idx != IDX_debug_info && cu->sec_idx != IDX_debug_types)
      61             :         {
      62           0 :           __libdw_seterrno (DWARF_E_INVALID_OFFSET);
      63           0 :           return -1;
      64             :         }
      65             : 
      66             :       /* Do we have to switch to the other section, or are we at the end?  */
      67        7456 :       if (! v4type)
      68             :         {
      69        7444 :           if (off >= cu->dbg->sectiondata[IDX_debug_info]->d_size)
      70             :             {
      71         174 :               if (cu->dbg->sectiondata[IDX_debug_types] == NULL)
      72             :                 return 1;
      73             : 
      74             :               off = 0;
      75             :               v4type = true;
      76             :             }
      77             :         }
      78             :       else
      79          12 :         if (off >= cu->dbg->sectiondata[IDX_debug_types]->d_size)
      80             :           return 1;
      81             :     }
      82             : 
      83        9537 :   *next_cu = __libdw_findcu (dwarf, off, v4type);
      84        9537 :   if (*next_cu == NULL)
      85             :     return -1;
      86             : 
      87        9531 :   Dwarf_CU *next = (*next_cu);
      88             : 
      89        9531 :   if (version != NULL)
      90        2885 :     *version = next->version;
      91             : 
      92        9531 :   if (unit_type != NULL)
      93        6306 :     *unit_type = next->unit_type;
      94             : 
      95        9531 :   if (cudie != NULL)
      96             :     {
      97        5196 :       if (next->version >= 2 && next->version <= 5
      98        5196 :           && next->unit_type >= DW_UT_compile
      99        5196 :           && next->unit_type <= DW_UT_split_type)
     100       15588 :         *cudie = CUDIE (next);
     101             :       else
     102           0 :         memset (cudie, '\0', sizeof (Dwarf_Die));
     103             :     }
     104             : 
     105        9531 :   if (subdie != NULL)
     106             :     {
     107        4557 :       if (next->version >= 2 && next->version <= 5)
     108             :         {
     109             :           /* For types, return the actual type DIE.  For skeletons,
     110             :              find the associated split compile unit and return its
     111             :              DIE.  */
     112        9114 :           if (next->unit_type == DW_UT_type
     113        4557 :               || next->unit_type == DW_UT_split_type)
     114          16 :             *subdie = SUBDIE(next);
     115        4549 :           else if (next->unit_type == DW_UT_skeleton)
     116             :             {
     117          20 :               Dwarf_CU *split_cu = __libdw_find_split_unit (next);
     118          20 :               if (split_cu != NULL)
     119          60 :                 *subdie = CUDIE(split_cu);
     120             :               else
     121           0 :                 memset (subdie, '\0', sizeof (Dwarf_Die));
     122             :             }
     123             :           else
     124        4529 :             memset (subdie, '\0', sizeof (Dwarf_Die));
     125             :         }
     126             :       else
     127           0 :         memset (subdie, '\0', sizeof (Dwarf_Die));
     128             :     }
     129             : 
     130             :   return 0;
     131             : }