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[external/binutils.git] / include / splay-tree.h
1 /* A splay-tree datatype.  
2    Copyright (C) 1998-2018 Free Software Foundation, Inc.
3    Contributed by Mark Mitchell (mark@markmitchell.com).
4
5    This file is part of GCC.
6    
7    GCC is free software; you can redistribute it and/or modify it
8    under the terms of the GNU General Public License as published by
9    the Free Software Foundation; either version 2, or (at your option)
10    any later version.
11
12    GCC is distributed in the hope that it will be useful, but
13    WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15    General Public License for more details.
16
17    You should have received a copy of the GNU General Public License
18    along with GCC; see the file COPYING.  If not, write to
19    the Free Software Foundation, 51 Franklin Street - Fifth Floor,
20    Boston, MA 02110-1301, USA.  */
21
22 /* For an easily readable description of splay-trees, see:
23
24      Lewis, Harry R. and Denenberg, Larry.  Data Structures and Their
25      Algorithms.  Harper-Collins, Inc.  1991.  
26
27    The major feature of splay trees is that all basic tree operations
28    are amortized O(log n) time for a tree with n nodes.  */
29
30 #ifndef _SPLAY_TREE_H
31 #define _SPLAY_TREE_H
32
33 #ifdef __cplusplus
34 extern "C" {
35 #endif /* __cplusplus */
36
37 #include "ansidecl.h"
38
39 #ifdef HAVE_STDINT_H
40 #include <stdint.h>
41 #endif
42 #ifdef HAVE_INTTYPES_H
43 #include <inttypes.h>
44 #endif
45
46 /* Use typedefs for the key and data types to facilitate changing
47    these types, if necessary.  These types should be sufficiently wide
48    that any pointer or scalar can be cast to these types, and then
49    cast back, without loss of precision.  */
50 typedef uintptr_t splay_tree_key;
51 typedef uintptr_t splay_tree_value;
52
53 /* Forward declaration for a node in the tree.  */
54 typedef struct splay_tree_node_s *splay_tree_node;
55
56 /* The type of a function which compares two splay-tree keys.  The
57    function should return values as for qsort.  */
58 typedef int (*splay_tree_compare_fn) (splay_tree_key, splay_tree_key);
59
60 /* The type of a function used to deallocate any resources associated
61    with the key.  */
62 typedef void (*splay_tree_delete_key_fn) (splay_tree_key);
63
64 /* The type of a function used to deallocate any resources associated
65    with the value.  */
66 typedef void (*splay_tree_delete_value_fn) (splay_tree_value);
67
68 /* The type of a function used to iterate over the tree.  */
69 typedef int (*splay_tree_foreach_fn) (splay_tree_node, void*);
70
71 /* The type of a function used to allocate memory for tree root and
72    node structures.  The first argument is the number of bytes needed;
73    the second is a data pointer the splay tree functions pass through
74    to the allocator.  This function must never return zero.  */
75 typedef void *(*splay_tree_allocate_fn) (int, void *);
76
77 /* The type of a function used to free memory allocated using the
78    corresponding splay_tree_allocate_fn.  The first argument is the
79    memory to be freed; the latter is a data pointer the splay tree
80    functions pass through to the freer.  */
81 typedef void (*splay_tree_deallocate_fn) (void *, void *);
82
83 /* The nodes in the splay tree.  */
84 struct splay_tree_node_s {
85   /* The key.  */
86   splay_tree_key key;
87
88   /* The value.  */
89   splay_tree_value value;
90
91   /* The left and right children, respectively.  */
92   splay_tree_node left;
93   splay_tree_node right;
94 };
95
96 /* The splay tree itself.  */
97 struct splay_tree_s {
98   /* The root of the tree.  */
99   splay_tree_node root;
100
101   /* The comparision function.  */
102   splay_tree_compare_fn comp;
103
104   /* The deallocate-key function.  NULL if no cleanup is necessary.  */
105   splay_tree_delete_key_fn delete_key;
106
107   /* The deallocate-value function.  NULL if no cleanup is necessary.  */
108   splay_tree_delete_value_fn delete_value;
109
110   /* Node allocate function.  Takes allocate_data as a parameter. */
111   splay_tree_allocate_fn allocate;
112
113   /* Free function for nodes and trees.  Takes allocate_data as a parameter.  */
114   splay_tree_deallocate_fn deallocate;
115
116   /* Parameter for allocate/free functions.  */
117   void *allocate_data;
118 };
119
120 typedef struct splay_tree_s *splay_tree;
121
122 extern splay_tree splay_tree_new (splay_tree_compare_fn,
123                                   splay_tree_delete_key_fn,
124                                   splay_tree_delete_value_fn);
125 extern splay_tree splay_tree_new_with_allocator (splay_tree_compare_fn,
126                                                  splay_tree_delete_key_fn,
127                                                  splay_tree_delete_value_fn,
128                                                  splay_tree_allocate_fn,
129                                                  splay_tree_deallocate_fn,
130                                                  void *);
131 extern splay_tree splay_tree_new_typed_alloc (splay_tree_compare_fn,
132                                               splay_tree_delete_key_fn,
133                                               splay_tree_delete_value_fn,
134                                               splay_tree_allocate_fn,
135                                               splay_tree_allocate_fn,
136                                               splay_tree_deallocate_fn,
137                                               void *);
138 extern void splay_tree_delete (splay_tree);
139 extern splay_tree_node splay_tree_insert (splay_tree,
140                                           splay_tree_key,
141                                           splay_tree_value);
142 extern void splay_tree_remove   (splay_tree, splay_tree_key);
143 extern splay_tree_node splay_tree_lookup (splay_tree, splay_tree_key);
144 extern splay_tree_node splay_tree_predecessor (splay_tree, splay_tree_key);
145 extern splay_tree_node splay_tree_successor (splay_tree, splay_tree_key);
146 extern splay_tree_node splay_tree_max (splay_tree);
147 extern splay_tree_node splay_tree_min (splay_tree);
148 extern int splay_tree_foreach (splay_tree, splay_tree_foreach_fn, void*);
149 extern int splay_tree_compare_ints (splay_tree_key, splay_tree_key);
150 extern int splay_tree_compare_pointers (splay_tree_key, splay_tree_key);
151 extern int splay_tree_compare_strings (splay_tree_key, splay_tree_key);
152 extern void splay_tree_delete_pointers (splay_tree_value);
153
154 #ifdef __cplusplus
155 }
156 #endif /* __cplusplus */
157
158 #endif /* _SPLAY_TREE_H */