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/* A hash map traits.
Copyright (C) 2015 Free Software Foundation, Inc.
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 HASH_MAP_TRAITS_H
#define HASH_MAP_TRAITS_H
/* Bacause mem-stats.h uses default hashmap traits, we have to
put the class to this separate header file. */
/* implement default behavior for traits when types allow it. */
struct default_hashmap_traits
{
/* Hashes the passed in key. */
template<typename T>
static hashval_t
hash (T *p)
{
return uintptr_t (p) >> 3;
}
/* If the value converts to hashval_t just use it. */
template<typename T> static hashval_t hash (T v) { return v; }
/* Return true if the two keys passed as arguments are equal. */
template<typename T>
static bool
equal_keys (const T &a, const T &b)
{
return a == b;
}
/* Called to dispose of the key and value before marking the entry as
deleted. */
template<typename T> static void remove (T &v) { v.~T (); }
/* Mark the passed in entry as being deleted. */
template<typename T>
static void
mark_deleted (T &e)
{
mark_key_deleted (e.m_key);
}
/* Mark the passed in entry as being empty. */
template<typename T>
static void
mark_empty (T &e)
{
mark_key_empty (e.m_key);
}
/* Return true if the passed in entry is marked as deleted. */
template<typename T>
static bool
is_deleted (T &e)
{
return e.m_key == (void *)1;
}
/* Return true if the passed in entry is marked as empty. */
template<typename T> static bool is_empty (T &e) { return e.m_key == NULL; }
private:
template<typename T>
static void
mark_key_deleted (T *&k)
{
k = reinterpret_cast<T *> (1);
}
template<typename T>
static void
mark_key_empty (T *&k)
{
k = static_cast<T *> (0);
}
};
#endif // HASH_MAP_TRAITS_H
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