Line data    Source code

       1             : /* Iterate through modules.
       2             :    Copyright (C) 2005, 2008 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             : #include "libdwflP.h"
      30             : 
      31             : ptrdiff_t
      32         412 : dwfl_getmodules (Dwfl *dwfl,
      33             :                  int (*callback) (Dwfl_Module *, void **,
      34             :                                   const char *, Dwarf_Addr, void *),
      35             :                  void *arg,
      36             :                  ptrdiff_t offset)
      37             : {
      38         412 :   if (dwfl == NULL)
      39             :     return -1;
      40             : 
      41             :   /* We iterate through the linked list when it's all we have.
      42             :      But continuing from an offset is slow that way.  So when
      43             :      DWFL->lookup_module is populated, we can instead keep our
      44             :      place by jumping directly into the array.  Since the actions
      45             :      of a callback could cause it to get populated, we must
      46             :      choose the style of place-holder when we return an offset,
      47             :      and we encode the choice in the low bits of that value.  */
      48             : 
      49         412 :   Dwfl_Module *m = dwfl->modulelist;
      50             : 
      51         412 :   if ((offset & 3) == 1)
      52             :     {
      53          18 :       offset >>= 2;
      54          73 :       for (ptrdiff_t pos = 0; pos < offset; ++pos)
      55          55 :         if (m == NULL)
      56             :           return -1;
      57             :         else
      58          55 :           m = m->next;
      59             :     }
      60         394 :   else if (((offset & 3) == 2) && likely (dwfl->lookup_module != NULL))
      61             :     {
      62           0 :       offset >>= 2;
      63             : 
      64           0 :       if ((size_t) offset - 1 == dwfl->lookup_elts)
      65             :         return 0;
      66             : 
      67           0 :       if (unlikely ((size_t) offset - 1 > dwfl->lookup_elts))
      68             :         return -1;
      69             : 
      70           0 :       m = dwfl->lookup_module[offset - 1];
      71           0 :       if (unlikely (m == NULL))
      72             :         return -1;
      73             :     }
      74         394 :   else if (offset != 0)
      75             :     {
      76           0 :       __libdwfl_seterrno (DWFL_E_BADSTROFF);
      77           0 :       return -1;
      78             :     }
      79             : 
      80         773 :   while (m != NULL)
      81             :     {
      82         434 :       int ok = (*callback) (MODCB_ARGS (m), arg);
      83         434 :       ++offset;
      84         434 :       m = m->next;
      85         434 :       if (ok != DWARF_CB_OK)
      86         122 :         return ((dwfl->lookup_module == NULL) ? ((offset << 2) | 1)
      87         146 :                 : (((m == NULL ? (ptrdiff_t) dwfl->lookup_elts + 1
      88          24 :                      : m->segment + 1) << 2) | 2));
      89             :     }
      90             :   return 0;
      91             : }
      92             : INTDEF (dwfl_getmodules)