libdw/dwarf_getscopes_die.c

/* Return scope DIEs containing given DIE.
   Copyright (C) 2005 Red Hat, Inc.
   This file is part of Red Hat elfutils.

   Red Hat elfutils is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by the
   Free Software Foundation; version 2 of the License.

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   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with Red Hat elfutils; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.

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   additional right to link the code of Red Hat elfutils with code licensed
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   this file solely under the GPL without exception.

   Red Hat elfutils is an included package of the Open Invention Network.
   An included package of the Open Invention Network is a package for which
   Open Invention Network licensees cross-license their patents.  No patent
   license is granted, either expressly or impliedly, by designation as an
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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "libdwP.h"
#include <assert.h>
#include <stdlib.h>

static int
scope_visitor (unsigned int depth, struct Dwarf_Die_Chain *die, void *arg)
{
  if (die->die.addr != *(void **) arg)
    return 0;

  Dwarf_Die *scopes = malloc (depth * sizeof scopes[0]);
  if (scopes == NULL)
    {
      __libdw_seterrno (DWARF_E_NOMEM);
      return -1;
    }

  unsigned int i = 0;
  do
    {
      scopes[i++] = die->die;
      die = die->parent;
    }
  while (die != NULL);
  assert (i == depth);

  *(void **) arg = scopes;
  return depth;
}

int
dwarf_getscopes_die (Dwarf_Die *die, Dwarf_Die **scopes)
{
  if (die == NULL)
    return -1;

  struct Dwarf_Die_Chain cu = { .die = CUDIE (die->cu), .parent = NULL };
  void *info = die->addr;
  int result = __libdw_visit_scopes (1, &cu, &scope_visitor, NULL, &info);
  if (result > 0)
    *scopes = info;
  return result;
}