/* A splay-tree datatype. | |

Copyright (C) 1998-2023 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, 51 Franklin Street - Fifth Floor, | |

Boston, MA 02110-1301, 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" | |

#ifdef HAVE_STDINT_H | |

#include <stdint.h> | |

#endif | |

#ifdef HAVE_INTTYPES_H | |

#include <inttypes.h> | |

#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 uintptr_t 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) (splay_tree_key, splay_tree_key); | |

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

with the key. If you provide this function, the splay tree | |

will take the ownership of the memory of the splay_tree_key arg | |

of splay_tree_insert. This function is called to release the keys | |

present in the tree when calling splay_tree_delete or splay_tree_remove. | |

If splay_tree_insert is called with a key equal to a key already | |

present in the tree, the old key and old value will be released. */ | |

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

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

with the value. If you provide this function, the memory of the | |

splay_tree_value arg of splay_tree_insert is managed similarly to | |

the splay_tree_key memory: see splay_tree_delete_key_fn. */ | |

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

/* The type of a function used to iterate over the tree. */ | |

typedef int (*splay_tree_foreach_fn) (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 void *(*splay_tree_allocate_fn) (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) (void *, void *); | |

/* The nodes in the splay tree. */ | |

struct splay_tree_node_s { | |

/* The key. */ | |

splay_tree_key key; | |

/* The value. */ | |

splay_tree_value value; | |

/* The left and right children, respectively. */ | |

splay_tree_node left; | |

splay_tree_node right; | |

}; | |

/* The splay tree itself. */ | |

struct splay_tree_s { | |

/* The root of the tree. */ | |

splay_tree_node 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; | |

/* Node allocate function. Takes allocate_data as a parameter. */ | |

splay_tree_allocate_fn allocate; | |

/* Free function for nodes and trees. Takes allocate_data as a parameter. */ | |

splay_tree_deallocate_fn deallocate; | |

/* Parameter for allocate/free functions. */ | |

void *allocate_data; | |

}; | |

typedef struct splay_tree_s *splay_tree; | |

extern splay_tree splay_tree_new (splay_tree_compare_fn, | |

splay_tree_delete_key_fn, | |

splay_tree_delete_value_fn); | |

extern splay_tree splay_tree_new_with_allocator (splay_tree_compare_fn, | |

splay_tree_delete_key_fn, | |

splay_tree_delete_value_fn, | |

splay_tree_allocate_fn, | |

splay_tree_deallocate_fn, | |

void *); | |

extern splay_tree splay_tree_new_typed_alloc (splay_tree_compare_fn, | |

splay_tree_delete_key_fn, | |

splay_tree_delete_value_fn, | |

splay_tree_allocate_fn, | |

splay_tree_allocate_fn, | |

splay_tree_deallocate_fn, | |

void *); | |

extern void splay_tree_delete (splay_tree); | |

extern splay_tree_node splay_tree_insert (splay_tree, | |

splay_tree_key, | |

splay_tree_value); | |

extern void splay_tree_remove (splay_tree, splay_tree_key); | |

extern splay_tree_node splay_tree_lookup (splay_tree, splay_tree_key); | |

extern splay_tree_node splay_tree_predecessor (splay_tree, splay_tree_key); | |

extern splay_tree_node splay_tree_successor (splay_tree, splay_tree_key); | |

extern splay_tree_node splay_tree_max (splay_tree); | |

extern splay_tree_node splay_tree_min (splay_tree); | |

extern int splay_tree_foreach (splay_tree, splay_tree_foreach_fn, void*); | |

extern int splay_tree_compare_ints (splay_tree_key, splay_tree_key); | |

extern int splay_tree_compare_pointers (splay_tree_key, splay_tree_key); | |

extern int splay_tree_compare_strings (splay_tree_key, splay_tree_key); | |

extern void splay_tree_delete_pointers (splay_tree_value); | |

#ifdef __cplusplus | |

} | |

#endif /* __cplusplus */ | |

#endif /* _SPLAY_TREE_H */ |