/* A splay-tree datatype. | |

Copyright 1998, 1999, 2000, 2002 Free Software Foundation, Inc. | |

Contributed by Mark Mitchell (mark@markmitchell.com). | |

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 */ | |

#include "ansidecl.h" | |

#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 unsigned long int splay_tree_key; | |

typedef unsigned long int 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 which compares two splay-tree keys. The | |

function should return values as for qsort. */ | |

typedef int (*splay_tree_compare_fn) PARAMS((splay_tree_key, splay_tree_key)); | |

/* The type of a function used to deallocate any resources associated | |

with the key. */ | |

typedef void (*splay_tree_delete_key_fn) PARAMS((splay_tree_key)); | |

/* The type of a function used to deallocate any resources associated | |

with the value. */ | |

typedef void (*splay_tree_delete_value_fn) PARAMS((splay_tree_value)); | |

/* 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; | |

/* The comparision function. */ | |

splay_tree_compare_fn comp; | |

/* The deallocate-key function. NULL if no cleanup is necessary. */ | |

splay_tree_delete_key_fn delete_key; | |

/* The deallocate-value function. NULL if no cleanup is necessary. */ | |

splay_tree_delete_value_fn delete_value; | |

/* 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; | |

}; | |

typedef struct splay_tree_s *splay_tree; | |

extern splay_tree splay_tree_new PARAMS((splay_tree_compare_fn, | |

splay_tree_delete_key_fn, | |

splay_tree_delete_value_fn)); | |

extern splay_tree splay_tree_new_with_allocator | |

PARAMS((splay_tree_compare_fn, | |

splay_tree_delete_key_fn, | |

splay_tree_delete_value_fn, | |

splay_tree_allocate_fn, | |

splay_tree_deallocate_fn, | |

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 */ |