| /* Hash Table Helper for Trees |
| Copyright (C) 2012-2017 Free Software Foundation, Inc. |
| Contributed by Lawrence Crowl <crowl@google.com> |
| |
| This file is part of GCC. |
| |
| GCC 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; either version 3, or (at your option) |
| any later version. |
| |
| GCC is distributed in the hope that it will be useful, |
| but 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 GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef GCC_TREE_HASHER_H |
| #define GCC_TREE_HASHER_H 1 |
| |
| struct int_tree_map { |
| unsigned int uid; |
| tree to; |
| }; |
| |
| /* Hashtable helpers. */ |
| |
| struct int_tree_hasher |
| { |
| typedef int_tree_map value_type; |
| typedef int_tree_map compare_type; |
| static inline hashval_t hash (const value_type &); |
| static inline bool equal (const value_type &, const compare_type &); |
| static bool is_deleted (const value_type &v) |
| { |
| return v.to == reinterpret_cast<tree> (1); |
| } |
| static void mark_deleted (value_type &v) { v.to = reinterpret_cast<tree> (0x1); } |
| static bool is_empty (const value_type &v) { return v.to == NULL; } |
| static void mark_empty (value_type &v) { v.to = NULL; } |
| static void remove (value_type &) {} |
| }; |
| |
| /* Hash a UID in a int_tree_map. */ |
| |
| inline hashval_t |
| int_tree_hasher::hash (const value_type &item) |
| { |
| return item.uid; |
| } |
| |
| /* Return true if the uid in both int tree maps are equal. */ |
| |
| inline bool |
| int_tree_hasher::equal (const value_type &a, const compare_type &b) |
| { |
| return (a.uid == b.uid); |
| } |
| |
| typedef hash_table <int_tree_hasher> int_tree_htab_type; |
| |
| #endif /* GCC_TREE_HASHER_H */ |