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/* A splay-tree datatype.
Copyright (C) 1998-2022 Free Software Foundation, Inc.
Contributed by Mark Mitchell (mark@markmitchell.com).
This file is part of the GNU Offloading and Multi Processing Library
(libgomp).
Libgomp 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.
Libgomp 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* The splay tree code copied from include/splay-tree.h and adjusted,
so that all the data lives directly in splay_tree_node_s structure
and no extra allocations are needed.
Files including this header should before including it add:
typedef struct splay_tree_node_s *splay_tree_node;
typedef struct splay_tree_s *splay_tree;
typedef struct splay_tree_key_s *splay_tree_key;
define splay_tree_key_s structure, and define
splay_compare inline function.
Alternatively, they can define splay_tree_prefix macro before
including this header and then all the above types, the
splay_compare function and the splay_tree_{lookup,insert_remove}
function will be prefixed by that prefix. If splay_tree_prefix
macro is defined, this header must be included twice: once where
you need the header file definitions, and once where you need the
.c implementation routines. In the latter case, you must also
define the macro splay_tree_c. See the include of splay-tree.h in
priority_queue.[hc] for an example. */
/* For an easily readable description of splay-trees, see:
Lewis, Harry R. and Denenberg, Larry. Data Structures and Their
Algorithms. Harper-Collins, Inc. 1991.
The major feature of splay trees is that all basic tree operations
are amortized O(log n) time for a tree with n nodes. */
#ifdef splay_tree_prefix
# define splay_tree_name_1(prefix, name) prefix ## _ ## name
# define splay_tree_name(prefix, name) splay_tree_name_1 (prefix, name)
# define splay_tree_node_s \
splay_tree_name (splay_tree_prefix, splay_tree_node_s)
# define splay_tree_s \
splay_tree_name (splay_tree_prefix, splay_tree_s)
# define splay_tree_key_s \
splay_tree_name (splay_tree_prefix, splay_tree_key_s)
# define splay_tree_node \
splay_tree_name (splay_tree_prefix, splay_tree_node)
# define splay_tree \
splay_tree_name (splay_tree_prefix, splay_tree)
# define splay_tree_key \
splay_tree_name (splay_tree_prefix, splay_tree_key)
# define splay_compare \
splay_tree_name (splay_tree_prefix, splay_compare)
# define splay_tree_lookup \
splay_tree_name (splay_tree_prefix, splay_tree_lookup)
# define splay_tree_insert \
splay_tree_name (splay_tree_prefix, splay_tree_insert)
# define splay_tree_remove \
splay_tree_name (splay_tree_prefix, splay_tree_remove)
# define splay_tree_foreach \
splay_tree_name (splay_tree_prefix, splay_tree_foreach)
# define splay_tree_callback \
splay_tree_name (splay_tree_prefix, splay_tree_callback)
#endif
#ifndef splay_tree_c
/* Header file definitions and prototypes. */
/* The nodes in the splay tree. */
struct splay_tree_node_s {
struct splay_tree_key_s key;
/* The left and right children, respectively. */
splay_tree_node left;
splay_tree_node right;
};
/* The splay tree. */
struct splay_tree_s {
splay_tree_node root;
};
typedef void (*splay_tree_callback) (splay_tree_key, void *);
extern splay_tree_key splay_tree_lookup (splay_tree, splay_tree_key);
extern void splay_tree_insert (splay_tree, splay_tree_node);
extern void splay_tree_remove (splay_tree, splay_tree_key);
extern void splay_tree_foreach (splay_tree, splay_tree_callback, void *);
#else /* splay_tree_c */
# ifdef splay_tree_prefix
# include "splay-tree.c"
# undef splay_tree_name_1
# undef splay_tree_name
# undef splay_tree_node_s
# undef splay_tree_s
# undef splay_tree_key_s
# undef splay_tree_node
# undef splay_tree
# undef splay_tree_key
# undef splay_compare
# undef splay_tree_lookup
# undef splay_tree_insert
# undef splay_tree_remove
# undef splay_tree_foreach
# undef splay_tree_callback
# undef splay_tree_c
# endif
#endif /* #ifndef splay_tree_c */
#ifdef splay_tree_prefix
# undef splay_tree_prefix
#endif
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