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Diffstat (limited to 'libmudflap/splay-tree.h')
| -rw-r--r-- | libmudflap/splay-tree.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/libmudflap/splay-tree.h b/libmudflap/splay-tree.h new file mode 100644 index 00000000000..269394d2109 --- /dev/null +++ b/libmudflap/splay-tree.h @@ -0,0 +1,136 @@ +/* A splay-tree datatype. + Copyright 1998, 1999, 2000, 2002, 2004 Free Software Foundation, Inc. + Contributed by Mark Mitchell (mark@markmitchell.com). + Adapted for libmudflap from libiberty. + +This file is part of GCC. + +GCC 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 2, or (at your option) +any later version. + +GCC 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. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING. If not, write to +the Free Software Foundation, 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + +/* 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. */ + +#ifndef _SPLAY_TREE_H +#define _SPLAY_TREE_H + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +#define PARAMS(X) X +#define PTR void * +#define ATTRIBUTE_UNUSED __attribute__((__unused__)) + +#ifndef GTY +#define GTY(X) +#endif + +/* Use typedefs for the key and data types to facilitate changing + these types, if necessary. These types should be sufficiently wide + that any pointer or scalar can be cast to these types, and then + cast back, without loss of precision. */ +typedef uintptr_t splay_tree_key; +typedef void *splay_tree_value; + +/* Forward declaration for a node in the tree. */ +typedef struct splay_tree_node_s *splay_tree_node; + +/* The type of a function used to iterate over the tree. */ +typedef int (*splay_tree_foreach_fn) PARAMS((splay_tree_node, void*)); + +/* The type of a function used to allocate memory for tree root and + node structures. The first argument is the number of bytes needed; + the second is a data pointer the splay tree functions pass through + to the allocator. This function must never return zero. */ +typedef PTR (*splay_tree_allocate_fn) PARAMS((int, void *)); + +/* The type of a function used to free memory allocated using the + corresponding splay_tree_allocate_fn. The first argument is the + memory to be freed; the latter is a data pointer the splay tree + functions pass through to the freer. */ +typedef void (*splay_tree_deallocate_fn) PARAMS((void *, void *)); + +/* The nodes in the splay tree. */ +struct splay_tree_node_s GTY(()) +{ + /* The key. */ + splay_tree_key GTY ((use_param1)) key; + + /* The value. */ + splay_tree_value GTY ((use_param2)) value; + + /* The left and right children, respectively. */ + splay_tree_node GTY ((use_params)) left; + splay_tree_node GTY ((use_params)) right; +}; + +/* The splay tree itself. */ +struct splay_tree_s GTY(()) +{ + /* The root of the tree. */ + splay_tree_node GTY ((use_params)) root; + + /* Allocate/free functions, and a data pointer to pass to them. */ + splay_tree_allocate_fn allocate; + splay_tree_deallocate_fn deallocate; + PTR GTY((skip)) allocate_data; + + /* The last key value for which the tree has been splayed, but not + since modified. */ + splay_tree_key GTY ((use_param1)) last_splayed_key; + int last_splayed_key_p; +}; +typedef struct splay_tree_s *splay_tree; + +extern splay_tree splay_tree_new PARAMS((void)); +extern void splay_tree_delete PARAMS((splay_tree)); +extern splay_tree_node splay_tree_insert + PARAMS((splay_tree, + splay_tree_key, + splay_tree_value)); +extern void splay_tree_remove PARAMS((splay_tree, + splay_tree_key)); +extern splay_tree_node splay_tree_lookup + PARAMS((splay_tree, + splay_tree_key)); +extern splay_tree_node splay_tree_predecessor + PARAMS((splay_tree, + splay_tree_key)); +extern splay_tree_node splay_tree_successor + PARAMS((splay_tree, + splay_tree_key)); +extern splay_tree_node splay_tree_max + PARAMS((splay_tree)); +extern splay_tree_node splay_tree_min + PARAMS((splay_tree)); +extern int splay_tree_foreach PARAMS((splay_tree, + splay_tree_foreach_fn, + void*)); +extern int splay_tree_compare_ints PARAMS((splay_tree_key, + splay_tree_key)); +extern int splay_tree_compare_pointers PARAMS((splay_tree_key, + splay_tree_key)); + +#ifdef __cplusplus +} +#endif /* __cplusplus */ + +#endif /* _SPLAY_TREE_H */ |