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/* Hash Table Helper for Trees
Copyright (C) 2012-2015 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 */
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