source: trunk/libs/newlib/src/include/splay-tree.h @ 577

Last change on this file since 577 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
File size: 5.4 KB
Line 
1/* A splay-tree datatype. 
2   Copyright (C) 1998-2015 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
34extern "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.  */
50typedef uintptr_t splay_tree_key;
51typedef uintptr_t splay_tree_value;
52
53/* Forward declaration for a node in the tree.  */
54typedef 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.  */
58typedef 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.  */
62typedef 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.  */
66typedef void (*splay_tree_delete_value_fn) (splay_tree_value);
67
68/* The type of a function used to iterate over the tree.  */
69typedef 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.  */
75typedef 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.  */
81typedef void (*splay_tree_deallocate_fn) (void *, void *);
82
83/* The nodes in the splay tree.  */
84struct 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.  */
97struct 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
120typedef struct splay_tree_s *splay_tree;
121
122extern splay_tree splay_tree_new (splay_tree_compare_fn,
123                                  splay_tree_delete_key_fn,
124                                  splay_tree_delete_value_fn);
125extern 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 *);
131extern 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 *);
138extern void splay_tree_delete (splay_tree);
139extern splay_tree_node splay_tree_insert (splay_tree,
140                                          splay_tree_key,
141                                          splay_tree_value);
142extern void splay_tree_remove   (splay_tree, splay_tree_key);
143extern splay_tree_node splay_tree_lookup (splay_tree, splay_tree_key);
144extern splay_tree_node splay_tree_predecessor (splay_tree, splay_tree_key);
145extern splay_tree_node splay_tree_successor (splay_tree, splay_tree_key);
146extern splay_tree_node splay_tree_max (splay_tree);
147extern splay_tree_node splay_tree_min (splay_tree);
148extern int splay_tree_foreach (splay_tree, splay_tree_foreach_fn, void*);
149extern int splay_tree_compare_ints (splay_tree_key, splay_tree_key);
150extern int splay_tree_compare_pointers (splay_tree_key, splay_tree_key);
151
152#ifdef __cplusplus
153}
154#endif /* __cplusplus */
155
156#endif /* _SPLAY_TREE_H */
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