66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/* Hash Table Helper for Trees
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Copyright (C) 2012-2017 Free Software Foundation, Inc.
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Contributed by Lawrence Crowl <crowl@google.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_TREE_HASHER_H
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#define GCC_TREE_HASHER_H 1
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struct int_tree_map {
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unsigned int uid;
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tree to;
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};
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/* Hashtable helpers. */
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struct int_tree_hasher
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{
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typedef int_tree_map value_type;
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typedef int_tree_map compare_type;
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static inline hashval_t hash (const value_type &);
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static inline bool equal (const value_type &, const compare_type &);
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static bool is_deleted (const value_type &v)
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{
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return v.to == reinterpret_cast<tree> (1);
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}
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static void mark_deleted (value_type &v) { v.to = reinterpret_cast<tree> (0x1); }
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static bool is_empty (const value_type &v) { return v.to == NULL; }
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static void mark_empty (value_type &v) { v.to = NULL; }
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static void remove (value_type &) {}
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};
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/* Hash a UID in a int_tree_map. */
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inline hashval_t
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int_tree_hasher::hash (const value_type &item)
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{
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return item.uid;
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}
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/* Return true if the uid in both int tree maps are equal. */
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inline bool
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int_tree_hasher::equal (const value_type &a, const compare_type &b)
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{
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return (a.uid == b.uid);
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}
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typedef hash_table <int_tree_hasher> int_tree_htab_type;
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#endif /* GCC_TREE_HASHER_H */
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