131 lines
4.8 KiB
C
131 lines
4.8 KiB
C
/* A splay-tree datatype.
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Copyright (C) 1998-2020 Free Software Foundation, Inc.
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Contributed by Mark Mitchell (mark@markmitchell.com).
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This file is part of the GNU Offloading and Multi Processing Library
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(libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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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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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* The splay tree code copied from include/splay-tree.h and adjusted,
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so that all the data lives directly in splay_tree_node_s structure
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and no extra allocations are needed.
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Files including this header should before including it add:
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typedef struct splay_tree_node_s *splay_tree_node;
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typedef struct splay_tree_s *splay_tree;
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typedef struct splay_tree_key_s *splay_tree_key;
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define splay_tree_key_s structure, and define
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splay_compare inline function.
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Alternatively, they can define splay_tree_prefix macro before
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including this header and then all the above types, the
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splay_compare function and the splay_tree_{lookup,insert_remove}
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function will be prefixed by that prefix. If splay_tree_prefix
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macro is defined, this header must be included twice: once where
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you need the header file definitions, and once where you need the
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.c implementation routines. In the latter case, you must also
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define the macro splay_tree_c. See the include of splay-tree.h in
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priority_queue.[hc] for an example. */
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/* For an easily readable description of splay-trees, see:
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Lewis, Harry R. and Denenberg, Larry. Data Structures and Their
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Algorithms. Harper-Collins, Inc. 1991.
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The major feature of splay trees is that all basic tree operations
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are amortized O(log n) time for a tree with n nodes. */
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#ifdef splay_tree_prefix
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# define splay_tree_name_1(prefix, name) prefix ## _ ## name
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# define splay_tree_name(prefix, name) splay_tree_name_1 (prefix, name)
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# define splay_tree_node_s \
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splay_tree_name (splay_tree_prefix, splay_tree_node_s)
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# define splay_tree_s \
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splay_tree_name (splay_tree_prefix, splay_tree_s)
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# define splay_tree_key_s \
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splay_tree_name (splay_tree_prefix, splay_tree_key_s)
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# define splay_tree_node \
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splay_tree_name (splay_tree_prefix, splay_tree_node)
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# define splay_tree \
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splay_tree_name (splay_tree_prefix, splay_tree)
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# define splay_tree_key \
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splay_tree_name (splay_tree_prefix, splay_tree_key)
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# define splay_compare \
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splay_tree_name (splay_tree_prefix, splay_compare)
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# define splay_tree_lookup \
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splay_tree_name (splay_tree_prefix, splay_tree_lookup)
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# define splay_tree_insert \
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splay_tree_name (splay_tree_prefix, splay_tree_insert)
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# define splay_tree_remove \
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splay_tree_name (splay_tree_prefix, splay_tree_remove)
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# define splay_tree_foreach \
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splay_tree_name (splay_tree_prefix, splay_tree_foreach)
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# define splay_tree_callback \
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splay_tree_name (splay_tree_prefix, splay_tree_callback)
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#endif
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#ifndef splay_tree_c
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/* Header file definitions and prototypes. */
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/* The nodes in the splay tree. */
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struct splay_tree_node_s {
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struct splay_tree_key_s key;
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/* The left and right children, respectively. */
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splay_tree_node left;
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splay_tree_node right;
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};
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/* The splay tree. */
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struct splay_tree_s {
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splay_tree_node root;
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};
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typedef void (*splay_tree_callback) (splay_tree_key, void *);
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extern splay_tree_key splay_tree_lookup (splay_tree, splay_tree_key);
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extern void splay_tree_insert (splay_tree, splay_tree_node);
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extern void splay_tree_remove (splay_tree, splay_tree_key);
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extern void splay_tree_foreach (splay_tree, splay_tree_callback, void *);
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#else /* splay_tree_c */
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# ifdef splay_tree_prefix
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# include "splay-tree.c"
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# undef splay_tree_name_1
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# undef splay_tree_name
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# undef splay_tree_node_s
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# undef splay_tree_s
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# undef splay_tree_key_s
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# undef splay_tree_node
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# undef splay_tree
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# undef splay_tree_key
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# undef splay_compare
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# undef splay_tree_lookup
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# undef splay_tree_insert
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# undef splay_tree_remove
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# undef splay_tree_foreach
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# undef splay_tree_callback
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# undef splay_tree_c
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# endif
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#endif /* #ifndef splay_tree_c */
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#ifdef splay_tree_prefix
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# undef splay_tree_prefix
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#endif
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