libgomp/splay-tree.h

   1 /* A splay-tree datatype.
   2    Copyright (C) 1998-2021 Free Software Foundation, Inc.
   3    Contributed by Mark Mitchell (mark@markmitchell.com).
   4
   5    This file is part of the GNU Offloading and Multi Processing Library
   6    (libgomp).
   7
   8    Libgomp is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
  14    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16    more details.
  17
  18    Under Section 7 of GPL version 3, you are granted additional
  19    permissions described in the GCC Runtime Library Exception, version
  20    3.1, as published by the Free Software Foundation.
  21
  22    You should have received a copy of the GNU General Public License and
  23    a copy of the GCC Runtime Library Exception along with this program;
  24    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25    <http://www.gnu.org/licenses/>.  */
  26
  27 /* The splay tree code copied from include/splay-tree.h and adjusted,
  28    so that all the data lives directly in splay_tree_node_s structure
  29    and no extra allocations are needed.
  30
  31    Files including this header should before including it add:
  32 typedef struct splay_tree_node_s *splay_tree_node;
  33 typedef struct splay_tree_s *splay_tree;
  34 typedef struct splay_tree_key_s *splay_tree_key;
  35    define splay_tree_key_s structure, and define
  36    splay_compare inline function.
  37
  38    Alternatively, they can define splay_tree_prefix macro before
  39    including this header and then all the above types, the
  40    splay_compare function and the splay_tree_{lookup,insert_remove}
  41    function will be prefixed by that prefix.  If splay_tree_prefix
  42    macro is defined, this header must be included twice: once where
  43    you need the header file definitions, and once where you need the
  44    .c implementation routines.  In the latter case, you must also
  45    define the macro splay_tree_c.  See the include of splay-tree.h in
  46    priority_queue.[hc] for an example.  */
  47
  48 /* For an easily readable description of splay-trees, see:
  49
  50      Lewis, Harry R. and Denenberg, Larry.  Data Structures and Their
  51      Algorithms.  Harper-Collins, Inc.  1991.
  52
  53    The major feature of splay trees is that all basic tree operations
  54    are amortized O(log n) time for a tree with n nodes.  */
  55
  56 #ifdef splay_tree_prefix
  57 # define splay_tree_name_1(prefix, name) prefix ## _ ## name
  58 # define splay_tree_name(prefix, name) splay_tree_name_1 (prefix, name)
  59 # define splay_tree_node_s      \
  60     splay_tree_name (splay_tree_prefix, splay_tree_node_s)
  61 # define splay_tree_s           \
  62     splay_tree_name (splay_tree_prefix, splay_tree_s)
  63 # define splay_tree_key_s       \
  64     splay_tree_name (splay_tree_prefix, splay_tree_key_s)
  65 # define splay_tree_node        \
  66     splay_tree_name (splay_tree_prefix, splay_tree_node)
  67 # define splay_tree             \
  68     splay_tree_name (splay_tree_prefix, splay_tree)
  69 # define splay_tree_key         \
  70     splay_tree_name (splay_tree_prefix, splay_tree_key)
  71 # define splay_compare          \
  72     splay_tree_name (splay_tree_prefix, splay_compare)
  73 # define splay_tree_lookup      \
  74     splay_tree_name (splay_tree_prefix, splay_tree_lookup)
  75 # define splay_tree_insert      \
  76     splay_tree_name (splay_tree_prefix, splay_tree_insert)
  77 # define splay_tree_remove      \
  78     splay_tree_name (splay_tree_prefix, splay_tree_remove)
  79 # define splay_tree_foreach     \
  80     splay_tree_name (splay_tree_prefix, splay_tree_foreach)
  81 # define splay_tree_callback    \
  82     splay_tree_name (splay_tree_prefix, splay_tree_callback)
  83 #endif
  84
  85 #ifndef splay_tree_c
  86 /* Header file definitions and prototypes.  */
  87
  88 /* The nodes in the splay tree.  */
  89 struct splay_tree_node_s {
  90   struct splay_tree_key_s key;
  91   /* The left and right children, respectively.  */
  92   splay_tree_node left;
  93   splay_tree_node right;
  94 };
  95
  96 /* The splay tree.  */
  97 struct splay_tree_s {
  98   splay_tree_node root;
  99 };
 100
 101 typedef void (*splay_tree_callback) (splay_tree_key, void *);
 102
 103 extern splay_tree_key splay_tree_lookup (splay_tree, splay_tree_key);
 104 extern void splay_tree_insert (splay_tree, splay_tree_node);
 105 extern void splay_tree_remove (splay_tree, splay_tree_key);
 106 extern void splay_tree_foreach (splay_tree, splay_tree_callback, void *);
 107 #else  /* splay_tree_c */
 108 #  ifdef splay_tree_prefix
 109 #    include "splay-tree.c"
 110 #    undef splay_tree_name_1
 111 #    undef splay_tree_name
 112 #    undef splay_tree_node_s
 113 #    undef splay_tree_s
 114 #    undef splay_tree_key_s
 115 #    undef splay_tree_node
 116 #    undef splay_tree
 117 #    undef splay_tree_key
 118 #    undef splay_compare
 119 #    undef splay_tree_lookup
 120 #    undef splay_tree_insert
 121 #    undef splay_tree_remove
 122 #    undef splay_tree_foreach
 123 #    undef splay_tree_callback
 124 #    undef splay_tree_c
 125 #  endif
 126 #endif /* #ifndef splay_tree_c */
 127
 128 #ifdef splay_tree_prefix
 129 #  undef splay_tree_prefix
 130 #endif