gcc/tree-hasher.h

   1 /* Hash Table Helper for Trees
   2    Copyright (C) 2012 Free Software Foundation, Inc.
   3    Contributed by Lawrence Crowl <crowl@google.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along 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 #include "tree-flow.h"
  26
  27 /* Hashtable helpers.  */
  28
  29 struct int_tree_hasher : typed_free_remove <int_tree_map>
  30 {
  31   typedef int_tree_map value_type;
  32   typedef int_tree_map compare_type;
  33   static inline hashval_t hash (const value_type *);
  34   static inline bool equal (const value_type *, const compare_type *);
  35 };
  36
  37 /* Hash a UID in a int_tree_map.  */
  38
  39 inline hashval_t
  40 int_tree_hasher::hash (const value_type *item)
  41 {
  42   return item->uid;
  43 }
  44
  45 /* Return true if the uid in both int tree maps are equal.  */
  46
  47 inline bool
  48 int_tree_hasher::equal (const value_type *a, const compare_type *b)
  49 {
  50   return (a->uid == b->uid);
  51 }
  52
  53 typedef hash_table <int_tree_hasher> int_tree_htab_type;
  54
  55 #endif /* GCC_TREE_HASHER_H  */