/* $NetBSD: rbtree.h,v 1.1 2010/09/25 01:42:40 matt Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Matt Thomas . * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #ifndef _SYS_RBTREE_H_ #define _SYS_RBTREE_H_ #if defined(_KERNEL) || defined(_STANDALONE) #include #else #include #include #endif #include /* GCC version checking borrowed from glibc. */ #if defined(__GNUC__) && defined(__GNUC_MINOR__) # define __GNUC_PREREQ(maj,min) \ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) #else # define __GNUC_PREREQ(maj,min) 0 #endif #if __GNUC_PREREQ(2, 96) # ifndef __predict_true # define __predict_true(exp) __builtin_expect((exp), 1) # endif # ifndef __predict_false # define __predict_false(exp) __builtin_expect((exp), 0) # endif #else # ifndef __predict_true # define __predict_true(exp) (exp) # endif # ifndef __predict_false # define __predict_false(exp) (exp) # endif #endif #ifdef __cplusplus extern "C" { #endif typedef struct rb_node { struct rb_node *rb_nodes[2]; #define RB_DIR_LEFT 0 #define RB_DIR_RIGHT 1 #define RB_DIR_OTHER 1 #define rb_left rb_nodes[RB_DIR_LEFT] #define rb_right rb_nodes[RB_DIR_RIGHT] /* * rb_info contains the two flags and the parent back pointer. * We put the two flags in the low two bits since we know that * rb_node will have an alignment of 4 or 8 bytes. */ uintptr_t rb_info; #define RB_FLAG_POSITION 0x2 #define RB_FLAG_RED 0x1 #define RB_FLAG_MASK (RB_FLAG_POSITION|RB_FLAG_RED) #define RB_FATHER(rb) \ ((struct rb_node *)((rb)->rb_info & ~RB_FLAG_MASK)) #define RB_SET_FATHER(rb, father) \ ((void)((rb)->rb_info = (uintptr_t)(father)|((rb)->rb_info & RB_FLAG_MASK))) #define RB_SENTINEL_P(rb) ((rb) == NULL) #define RB_LEFT_SENTINEL_P(rb) RB_SENTINEL_P((rb)->rb_left) #define RB_RIGHT_SENTINEL_P(rb) RB_SENTINEL_P((rb)->rb_right) #define RB_FATHER_SENTINEL_P(rb) RB_SENTINEL_P(RB_FATHER((rb))) #define RB_CHILDLESS_P(rb) \ (RB_SENTINEL_P(rb) || (RB_LEFT_SENTINEL_P(rb) && RB_RIGHT_SENTINEL_P(rb))) #define RB_TWOCHILDREN_P(rb) \ (!RB_SENTINEL_P(rb) && !RB_LEFT_SENTINEL_P(rb) && !RB_RIGHT_SENTINEL_P(rb)) #define RB_POSITION(rb) \ (((rb)->rb_info & RB_FLAG_POSITION) ? RB_DIR_RIGHT : RB_DIR_LEFT) #define RB_RIGHT_P(rb) (RB_POSITION(rb) == RB_DIR_RIGHT) #define RB_LEFT_P(rb) (RB_POSITION(rb) == RB_DIR_LEFT) #define RB_RED_P(rb) (!RB_SENTINEL_P(rb) && ((rb)->rb_info & RB_FLAG_RED) != 0) #define RB_BLACK_P(rb) (RB_SENTINEL_P(rb) || ((rb)->rb_info & RB_FLAG_RED) == 0) #define RB_MARK_RED(rb) ((void)((rb)->rb_info |= RB_FLAG_RED)) #define RB_MARK_BLACK(rb) ((void)((rb)->rb_info &= ~RB_FLAG_RED)) #define RB_INVERT_COLOR(rb) ((void)((rb)->rb_info ^= RB_FLAG_RED)) #define RB_ROOT_P(rbt, rb) ((rbt)->rbt_root == (rb)) #define RB_SET_POSITION(rb, position) \ ((void)((position) ? ((rb)->rb_info |= RB_FLAG_POSITION) : \ ((rb)->rb_info &= ~RB_FLAG_POSITION))) #define RB_ZERO_PROPERTIES(rb) ((void)((rb)->rb_info &= ~RB_FLAG_MASK)) #define RB_COPY_PROPERTIES(dst, src) \ ((void)((dst)->rb_info ^= ((dst)->rb_info ^ (src)->rb_info) & RB_FLAG_MASK)) #define RB_SWAP_PROPERTIES(a, b) do { \ uintptr_t xorinfo = ((a)->rb_info ^ (b)->rb_info) & RB_FLAG_MASK; \ (a)->rb_info ^= xorinfo; \ (b)->rb_info ^= xorinfo; \ } while (/*CONSTCOND*/ 0) #ifdef RBDEBUG TAILQ_ENTRY(rb_node) rb_link; #endif } rb_node_t; #define RB_TREE_MIN(T) rb_tree_iterate((T), NULL, RB_DIR_LEFT) #define RB_TREE_MAX(T) rb_tree_iterate((T), NULL, RB_DIR_RIGHT) #define RB_TREE_FOREACH(N, T) \ for ((N) = RB_TREE_MIN(T); (N); \ (N) = rb_tree_iterate((T), (N), RB_DIR_RIGHT)) #define RB_TREE_FOREACH_REVERSE(N, T) \ for ((N) = RB_TREE_MAX(T); (N); \ (N) = rb_tree_iterate((T), (N), RB_DIR_LEFT)) #ifdef RBDEBUG TAILQ_HEAD(rb_node_qh, rb_node); #define RB_TAILQ_REMOVE(a, b, c) TAILQ_REMOVE(a, b, c) #define RB_TAILQ_INIT(a) TAILQ_INIT(a) #define RB_TAILQ_INSERT_HEAD(a, b, c) TAILQ_INSERT_HEAD(a, b, c) #define RB_TAILQ_INSERT_BEFORE(a, b, c) TAILQ_INSERT_BEFORE(a, b, c) #define RB_TAILQ_INSERT_AFTER(a, b, c, d) TAILQ_INSERT_AFTER(a, b, c, d) #else #define RB_TAILQ_REMOVE(a, b, c) do { } while (/*CONSTCOND*/0) #define RB_TAILQ_INIT(a) do { } while (/*CONSTCOND*/0) #define RB_TAILQ_INSERT_HEAD(a, b, c) do { } while (/*CONSTCOND*/0) #define RB_TAILQ_INSERT_BEFORE(a, b, c) do { } while (/*CONSTCOND*/0) #define RB_TAILQ_INSERT_AFTER(a, b, c, d) do { } while (/*CONSTCOND*/0) #endif /* RBDEBUG */ /* * rbto_compare_nodes_fn: * return a positive value if the first node > the second node. * return a negative value if the first node < the second node. * return 0 if they are considered same. * * rbto_compare_key_fn: * return a positive value if the node > the key. * return a negative value if the node < the key. * return 0 if they are considered same. */ typedef signed int (*const rbto_compare_nodes_fn)(void *, const void *, const void *); typedef signed int (*const rbto_compare_key_fn)(void *, const void *, const void *); typedef struct { rbto_compare_nodes_fn rbto_compare_nodes; rbto_compare_key_fn rbto_compare_key; size_t rbto_node_offset; void *rbto_context; } rb_tree_ops_t; typedef struct rb_tree { struct rb_node *rbt_root; const rb_tree_ops_t *rbt_ops; struct rb_node *rbt_minmax[2]; #ifdef RBDEBUG struct rb_node_qh rbt_nodes; #endif #ifdef RBSTATS unsigned int rbt_count; unsigned int rbt_insertions; unsigned int rbt_removals; unsigned int rbt_insertion_rebalance_calls; unsigned int rbt_insertion_rebalance_passes; unsigned int rbt_removal_rebalance_calls; unsigned int rbt_removal_rebalance_passes; #endif } rb_tree_t; #ifdef RBSTATS #define RBSTAT_INC(v) ((void)((v)++)) #define RBSTAT_DEC(v) ((void)((v)--)) #else #define RBSTAT_INC(v) do { } while (/*CONSTCOND*/0) #define RBSTAT_DEC(v) do { } while (/*CONSTCOND*/0) #endif void rb_tree_init(rb_tree_t *, const rb_tree_ops_t *); void * rb_tree_insert_node(rb_tree_t *, void *); void * rb_tree_find_node(rb_tree_t *, const void *); void * rb_tree_find_node_geq(rb_tree_t *, const void *); void * rb_tree_find_node_leq(rb_tree_t *, const void *); void rb_tree_remove_node(rb_tree_t *, void *); void * rb_tree_iterate(rb_tree_t *, void *, const unsigned int); #ifdef RBDEBUG void rb_tree_check(const rb_tree_t *, bool); #endif #ifdef RBSTATS void rb_tree_depths(const rb_tree_t *, size_t *); #endif #ifdef __cplusplus extern "C" { #endif #endif /* _SYS_RBTREE_H_*/