1/* Hash Table Helper for Trees
2   Copyright (C) 2012-2015 Free Software Foundation, Inc.
3   Contributed by Lawrence Crowl <crowl@google.com>
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 3, or (at your option)
10any later version.
11
12GCC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING3.  If not see
19<http://www.gnu.org/licenses/>.  */
20
21#ifndef GCC_TREE_HASHER_H
22#define GCC_TREE_HASHER_H 1
23
24#include "hash-table.h"
25
26struct int_tree_map {
27  unsigned int uid;
28  tree to;
29};
30
31/* Hashtable helpers.  */
32
33struct int_tree_hasher
34{
35  typedef int_tree_map value_type;
36  typedef int_tree_map compare_type;
37  typedef int store_values_directly;
38  static inline hashval_t hash (const value_type &);
39  static inline bool equal (const value_type &, const compare_type &);
40  static bool is_deleted (const value_type &v)
41    {
42      return v.to == reinterpret_cast<tree> (1);
43    }
44  static void mark_deleted (value_type &v) { v.to = reinterpret_cast<tree> (0x1); }
45  static bool is_empty (const value_type &v) { return v.to == NULL; }
46  static void mark_empty (value_type &v) { v.to = NULL; }
47  static void remove (value_type &) {}
48};
49
50/* Hash a UID in a int_tree_map.  */
51
52inline hashval_t
53int_tree_hasher::hash (const value_type &item)
54{
55  return item.uid;
56}
57
58/* Return true if the uid in both int tree maps are equal.  */
59
60inline bool
61int_tree_hasher::equal (const value_type &a, const compare_type &b)
62{
63  return (a.uid == b.uid);
64}
65
66typedef hash_table <int_tree_hasher> int_tree_htab_type;
67
68#endif /* GCC_TREE_HASHER_H  */
69