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      1 /* Return scope DIEs containing given DIE.
      2    Copyright (C) 2005, 2015 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 #include "libdwP.h"
     33 #include <assert.h>
     34 #include <stdlib.h>
     35 
     36 static int
     37 scope_visitor (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
     38 {
     39   if (die->die.addr != *(void **) arg)
     40     return 0;
     41 
     42   Dwarf_Die *scopes = malloc (depth * sizeof scopes[0]);
     43   if (scopes == NULL)
     44     {
     45       __libdw_seterrno (DWARF_E_NOMEM);
     46       return -1;
     47     }
     48 
     49   unsigned int i = 0;
     50   do
     51     {
     52       scopes[i++] = die->die;
     53       die = die->parent;
     54     }
     55   while (die != NULL);
     56   assert (i == depth);
     57 
     58   *(void **) arg = scopes;
     59   return depth;
     60 }
     61 
     62 int
     63 dwarf_getscopes_die (Dwarf_Die *die, Dwarf_Die **scopes)
     64 {
     65   if (die == NULL)
     66     return -1;
     67 
     68   struct Dwarf_Die_Chain cu = { .die = CUDIE (die->cu), .parent = NULL };
     69   void *info = die->addr;
     70   int result = __libdw_visit_scopes (1, &cu, NULL, &scope_visitor, NULL, &info);
     71   if (result > 0)
     72     *scopes = info;
     73   return result;
     74 }
     75