/var/lang/include/node/uv
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/*- * Copyright 2002 Niels Provos <provos@citi.umich.edu> * All rights reserved. * * 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 AUTHOR ``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 AUTHOR 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 UV_TREE_H_#define UV_TREE_H_ #ifndef UV__UNUSED# if __GNUC__# define UV__UNUSED __attribute__((unused))# else# define UV__UNUSED# endif#endif /* * This file defines data structures for red-black trees. * A red-black tree is a binary search tree with the node color as an * extra attribute. It fulfills a set of conditions: * - every search path from the root to a leaf consists of the * same number of black nodes, * - each red node (except for the root) has a black parent, * - each leaf node is black. * * Every operation on a red-black tree is bounded as O(lg n). * The maximum height of a red-black tree is 2lg (n+1). */ /* Macros that define a red-black tree */#define RB_HEAD(name, type) \struct name { \ struct type *rbh_root; /* root of the tree */ \} #define RB_INITIALIZER(root) \ { NULL } #define RB_INIT(root) do { \ (root)->rbh_root = NULL; \} while (/*CONSTCOND*/ 0) #define RB_BLACK 0#define RB_RED 1#define RB_ENTRY(type) \struct { \ struct type *rbe_left; /* left element */ \ struct type *rbe_right; /* right element */ \ struct type *rbe_parent; /* parent element */ \ int rbe_color; /* node color */ \} #define RB_LEFT(elm, field) (elm)->field.rbe_left#define RB_RIGHT(elm, field) (elm)->field.rbe_right#define RB_PARENT(elm, field) (elm)->field.rbe_parent#define RB_COLOR(elm, field) (elm)->field.rbe_color#define RB_ROOT(head) (head)->rbh_root#define RB_EMPTY(head) (RB_ROOT(head) == NULL) #define RB_SET(elm, parent, field) do { \ RB_PARENT(elm, field) = parent; \ RB_LEFT(elm, field) = RB_RIGHT(elm, field) = NULL; \ RB_COLOR(elm, field) = RB_RED; \} while (/*CONSTCOND*/ 0) #define RB_SET_BLACKRED(black, red, field) do { \ RB_COLOR(black, field) = RB_BLACK; \ RB_COLOR(red, field) = RB_RED; \} while (/*CONSTCOND*/ 0) #ifndef RB_AUGMENT#define RB_AUGMENT(x) do {} while (0)#endif #define RB_ROTATE_LEFT(head, elm, tmp, field) do { \ (tmp) = RB_RIGHT(elm, field); \ if ((RB_RIGHT(elm, field) = RB_LEFT(tmp, field)) != NULL) { \ RB_PARENT(RB_LEFT(tmp, field), field) = (elm); \ } \ RB_AUGMENT(elm); \ if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field)) != NULL) { \ if ((elm) == RB_LEFT(RB_PARENT(elm, field), field)) \ RB_LEFT(RB_PARENT(elm, field), field) = (tmp); \ else \ RB_RIGHT(RB_PARENT(elm, field), field) = (tmp); \ } else \ (head)->rbh_root = (tmp); \ RB_LEFT(tmp, field) = (elm); \ RB_PARENT(elm, field) = (tmp); \ RB_AUGMENT(tmp); \ if ((RB_PARENT(tmp, field))) \ RB_AUGMENT(RB_PARENT(tmp, field)); \} while (/*CONSTCOND*/ 0) #define RB_ROTATE_RIGHT(head, elm, tmp, field) do { \ (tmp) = RB_LEFT(elm, field); \ if ((RB_LEFT(elm, field) = RB_RIGHT(tmp, field)) != NULL) { \ RB_PARENT(RB_RIGHT(tmp, field), field) = (elm); \ } \ RB_AUGMENT(elm); \ if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field)) != NULL) { \ if ((elm) == RB_LEFT(RB_PARENT(elm, field), field)) \ RB_LEFT(RB_PARENT(elm, field), field) = (tmp); \ else \ RB_RIGHT(RB_PARENT(elm, field), field) = (tmp); \ } else \ (head)->rbh_root = (tmp); \ RB_RIGHT(tmp, field) = (elm); \ RB_PARENT(elm, field) = (tmp); \ RB_AUGMENT(tmp); \ if ((RB_PARENT(tmp, field))) \ RB_AUGMENT(RB_PARENT(tmp, field)); \} while (/*CONSTCOND*/ 0) /* Generates prototypes and inline functions */#define RB_PROTOTYPE(name, type, field, cmp) \ RB_PROTOTYPE_INTERNAL(name, type, field, cmp,)#define RB_PROTOTYPE_STATIC(name, type, field, cmp) \ RB_PROTOTYPE_INTERNAL(name, type, field, cmp, UV__UNUSED static)#define RB_PROTOTYPE_INTERNAL(name, type, field, cmp, attr) \attr void name##_RB_INSERT_COLOR(struct name *, struct type *); \attr void name##_RB_REMOVE_COLOR(struct name *, struct type *, struct type *);\attr struct type *name##_RB_REMOVE(struct name *, struct type *); \attr struct type *name##_RB_INSERT(struct name *, struct type *); \attr struct type *name##_RB_FIND(struct name *, struct type *); \attr struct type *name##_RB_NFIND(struct name *, struct type *); \attr struct type *name##_RB_NEXT(struct type *); \attr struct type *name##_RB_PREV(struct type *); \attr struct type *name##_RB_MINMAX(struct name *, int); \ \ /* Main rb operation. * Moves node close to the key of elm to top */#define RB_GENERATE(name, type, field, cmp) \ RB_GENERATE_INTERNAL(name, type, field, cmp,)#define RB_GENERATE_STATIC(name, type, field, cmp) \ RB_GENERATE_INTERNAL(name, type, field, cmp, UV__UNUSED static)#define RB_GENERATE_INTERNAL(name, type, field, cmp, attr) \attr void \name##_RB_INSERT_COLOR(struct name *head, struct type *elm) \{ \ struct type *parent, *gparent, *tmp; \ while ((parent = RB_PARENT(elm, field)) != NULL && \ RB_COLOR(parent, field) == RB_RED) { \ gparent = RB_PARENT(parent, field); \ if (parent == RB_LEFT(gparent, field)) { \ tmp = RB_RIGHT(gparent, field); \ if (tmp && RB_COLOR(tmp, field) == RB_RED) { \ RB_COLOR(tmp, field) = RB_BLACK; \ RB_SET_BLACKRED(parent, gparent, field); \ elm = gparent; \ continue; \ } \ if (RB_RIGHT(parent, field) == elm) { \ RB_ROTATE_LEFT(head, parent, tmp, field); \ tmp = parent; \ parent = elm; \ elm = tmp; \ } \ RB_SET_BLACKRED(parent, gparent, field); \ RB_ROTATE_RIGHT(head, gparent, tmp, field); \ } else { \ tmp = RB_LEFT(gparent, field); \ if (tmp && RB_COLOR(tmp, field) == RB_RED) { \ RB_COLOR(tmp, field) = RB_BLACK; \ RB_SET_BLACKRED(parent, gparent, field); \ elm = gparent; \ continue; \ } \ if (RB_LEFT(parent, field) == elm) { \ RB_ROTATE_RIGHT(head, parent, tmp, field); \ tmp = parent; \ parent = elm; \ elm = tmp; \ } \ RB_SET_BLACKRED(parent, gparent, field); \ RB_ROTATE_LEFT(head, gparent, tmp, field); \ } \ } \ RB_COLOR(head->rbh_root, field) = RB_BLACK; \} \ \attr void \name##_RB_REMOVE_COLOR(struct name *head, struct type *parent, \ struct type *elm) \{ \ struct type *tmp; \ while ((elm == NULL || RB_COLOR(elm, field) == RB_BLACK) && \ elm != RB_ROOT(head)) { \ if (RB_LEFT(parent, field) == elm) { \ tmp = RB_RIGHT(parent, field); \ if (RB_COLOR(tmp, field) == RB_RED) { \ RB_SET_BLACKRED(tmp, parent, field); \ RB_ROTATE_LEFT(head, parent, tmp, field); \ tmp = RB_RIGHT(parent, field); \ } \ if ((RB_LEFT(tmp, field) == NULL || \ RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) && \ (RB_RIGHT(tmp, field) == NULL || \ RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK)) { \ RB_COLOR(tmp, field) = RB_RED; \ elm = parent; \ parent = RB_PARENT(elm, field); \ } else { \ if (RB_RIGHT(tmp, field) == NULL || \ RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK) { \ struct type *oleft; \ if ((oleft = RB_LEFT(tmp, field)) \ != NULL) \ RB_COLOR(oleft, field) = RB_BLACK; \ RB_COLOR(tmp, field) = RB_RED; \ RB_ROTATE_RIGHT(head, tmp, oleft, field); \ tmp = RB_RIGHT(parent, field); \ } \ RB_COLOR(tmp, field) = RB_COLOR(parent, field); \ RB_COLOR(parent, field) = RB_BLACK; \ if (RB_RIGHT(tmp, field)) \ RB_COLOR(RB_RIGHT(tmp, field), field) = RB_BLACK; \ RB_ROTATE_LEFT(head, parent, tmp, field); \ elm = RB_ROOT(head); \ break; \ } \ } else { \ tmp = RB_LEFT(parent, field); \ if (RB_COLOR(tmp, field) == RB_RED) { \ RB_SET_BLACKRED(tmp, parent, field); \ RB_ROTATE_RIGHT(head, parent, tmp, field); \ tmp = RB_LEFT(parent, field); \ } \ if ((RB_LEFT(tmp, field) == NULL || \ RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) && \ (RB_RIGHT(tmp, field) == NULL || \ RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK)) { \ RB_COLOR(tmp, field) = RB_RED; \ elm = parent; \ parent = RB_PARENT(elm, field); \ } else { \ if (RB_LEFT(tmp, field) == NULL || \ RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) { \ struct type *oright; \ if ((oright = RB_RIGHT(tmp, field)) \ != NULL) \ RB_COLOR(oright, field) = RB_BLACK; \ RB_COLOR(tmp, field) = RB_RED; \ RB_ROTATE_LEFT(head, tmp, oright, field); \ tmp = RB_LEFT(parent, field); \ } \ RB_COLOR(tmp, field) = RB_COLOR(parent, field); \ RB_COLOR(parent, field) = RB_BLACK; \ if (RB_LEFT(tmp, field)) \ RB_COLOR(RB_LEFT(tmp, field), field) = RB_BLACK; \ RB_ROTATE_RIGHT(head, parent, tmp, field); \ elm = RB_ROOT(head); \ break; \ } \ } \ } \ if (elm) \ RB_COLOR(elm, field) = RB_BLACK; \} \ \attr struct type * \name##_RB_REMOVE(struct name *head, struct type *elm) \{ \ struct type *child, *parent, *old = elm; \ int color; \ if (RB_LEFT(elm, field) == NULL) \ child = RB_RIGHT(elm, field); \ else if (RB_RIGHT(elm, field) == NULL) \ child = RB_LEFT(elm, field); \ else { \ struct type *left; \ elm = RB_RIGHT(elm, field); \ while ((left = RB_LEFT(elm, field)) != NULL) \ elm = left; \ child = RB_RIGHT(elm, field); \ parent = RB_PARENT(elm, field); \ color = RB_COLOR(elm, field); \ if (child) \ RB_PARENT(child, field) = parent; \ if (parent) { \ if (RB_LEFT(parent, field) == elm) \ RB_LEFT(parent, field) = child; \ else \ RB_RIGHT(parent, field) = child; \ RB_AUGMENT(parent); \ } else \ RB_ROOT(head) = child; \ if (RB_PARENT(elm, field) == old) \ parent = elm; \ (elm)->field = (old)->field; \ if (RB_PARENT(old, field)) { \ if (RB_LEFT(RB_PARENT(old, field), field) == old) \ RB_LEFT(RB_PARENT(old, field), field) = elm; \ else \ RB_RIGHT(RB_PARENT(old, field), field) = elm; \ RB_AUGMENT(RB_PARENT(old, field)); \ } else \ RB_ROOT(head) = elm; \ RB_PARENT(RB_LEFT(old, field), field) = elm; \ if (RB_RIGHT(old, field)) \ RB_PARENT(RB_RIGHT(old, field), field) = elm; \ if (parent) { \ left = parent; \ do { \ RB_AUGMENT(left); \ } while ((left = RB_PARENT(left, field)) != NULL); \ } \ goto color; \ } \ parent = RB_PARENT(elm, field); \ color = RB_COLOR(elm, field); \ if (child) \ RB_PARENT(child, field) = parent; \ if (parent) { \ if (RB_LEFT(parent, field) == elm) \ RB_LEFT(parent, field) = child; \ else \ RB_RIGHT(parent, field) = child; \ RB_AUGMENT(parent); \ } else \ RB_ROOT(head) = child; \color: \ if (color == RB_BLACK) \ name##_RB_REMOVE_COLOR(head, parent, child); \ return (old); \} \ \/* Inserts a node into the RB tree */ \attr struct type * \name##_RB_INSERT(struct name *head, struct type *elm) \{ \ struct type *tmp; \ struct type *parent = NULL; \ int comp = 0; \ tmp = RB_ROOT(head); \ while (tmp) { \ parent = tmp; \ comp = (cmp)(elm, parent); \ if (comp < 0) \ tmp = RB_LEFT(tmp, field); \ else if (comp > 0) \ tmp = RB_RIGHT(tmp, field); \ else \ return (tmp); \ } \ RB_SET(elm, parent, field); \ if (parent != NULL) { \ if (comp < 0) \ RB_LEFT(parent, field) = elm; \ else \ RB_RIGHT(parent, field) = elm; \ RB_AUGMENT(parent); \ } else \ RB_ROOT(head) = elm; \ name##_RB_INSERT_COLOR(head, elm); \ return (NULL); \} \ \/* Finds the node with the same key as elm */ \attr struct type * \name##_RB_FIND(struct name *head, struct type *elm) \{ \ struct type *tmp = RB_ROOT(head); \ int comp; \ while (tmp) { \ comp = cmp(elm, tmp); \ if (comp < 0) \ tmp = RB_LEFT(tmp, field); \ else if (comp > 0) \ tmp = RB_RIGHT(tmp, field); \ else \ return (tmp); \ } \ return (NULL); \} \ \/* Finds the first node greater than or equal to the search key */ \attr struct type * \name##_RB_NFIND(struct name *head, struct type *elm) \{ \ struct type *tmp = RB_ROOT(head); \ struct type *res = NULL; \ int comp; \ while (tmp) { \ comp = cmp(elm, tmp); \ if (comp < 0) { \ res = tmp; \ tmp = RB_LEFT(tmp, field); \ } \ else if (comp > 0) \ tmp = RB_RIGHT(tmp, field); \ else \ return (tmp); \ } \ return (res); \} \ \/* ARGSUSED */ \attr struct type * \name##_RB_NEXT(struct type *elm) \{ \ if (RB_RIGHT(elm, field)) { \ elm = RB_RIGHT(elm, field); \ while (RB_LEFT(elm, field)) \ elm = RB_LEFT(elm, field); \ } else { \ if (RB_PARENT(elm, field) && \ (elm == RB_LEFT(RB_PARENT(elm, field), field))) \ elm = RB_PARENT(elm, field); \ else { \ while (RB_PARENT(elm, field) && \ (elm == RB_RIGHT(RB_PARENT(elm, field), field))) \ elm = RB_PARENT(elm, field); \ elm = RB_PARENT(elm, field); \ } \ } \ return (elm); \} \ \/* ARGSUSED */ \attr struct type * \name##_RB_PREV(struct type *elm) \{ \ if (RB_LEFT(elm, field)) { \ elm = RB_LEFT(elm, field); \ while (RB_RIGHT(elm, field)) \ elm = RB_RIGHT(elm, field); \ } else { \ if (RB_PARENT(elm, field) && \ (elm == RB_RIGHT(RB_PARENT(elm, field), field))) \ elm = RB_PARENT(elm, field); \ else { \ while (RB_PARENT(elm, field) && \ (elm == RB_LEFT(RB_PARENT(elm, field), field))) \ elm = RB_PARENT(elm, field); \ elm = RB_PARENT(elm, field); \ } \ } \ return (elm); \} \ \attr struct type * \name##_RB_MINMAX(struct name *head, int val) \{ \ struct type *tmp = RB_ROOT(head); \ struct type *parent = NULL; \ while (tmp) { \ parent = tmp; \ if (val < 0) \ tmp = RB_LEFT(tmp, field); \ else \ tmp = RB_RIGHT(tmp, field); \ } \ return (parent); \} #define RB_NEGINF -1#define RB_INF 1 #define RB_INSERT(name, x, y) name##_RB_INSERT(x, y)#define RB_REMOVE(name, x, y) name##_RB_REMOVE(x, y)#define RB_FIND(name, x, y) name##_RB_FIND(x, y)#define RB_NFIND(name, x, y) name##_RB_NFIND(x, y)#define RB_NEXT(name, x) name##_RB_NEXT(x)#define RB_PREV(name, x) name##_RB_PREV(x)#define RB_MIN(name, x) name##_RB_MINMAX(x, RB_NEGINF)#define RB_MAX(name, x) name##_RB_MINMAX(x, RB_INF) #define RB_FOREACH(x, name, head) \ for ((x) = RB_MIN(name, head); \ (x) != NULL; \ (x) = name##_RB_NEXT(x)) #define RB_FOREACH_FROM(x, name, y) \ for ((x) = (y); \ ((x) != NULL) && ((y) = name##_RB_NEXT(x), (x) != NULL); \ (x) = (y)) #define RB_FOREACH_SAFE(x, name, head, y) \ for ((x) = RB_MIN(name, head); \ ((x) != NULL) && ((y) = name##_RB_NEXT(x), (x) != NULL); \ (x) = (y)) #define RB_FOREACH_REVERSE(x, name, head) \ for ((x) = RB_MAX(name, head); \ (x) != NULL; \ (x) = name##_RB_PREV(x)) #define RB_FOREACH_REVERSE_FROM(x, name, y) \ for ((x) = (y); \ ((x) != NULL) && ((y) = name##_RB_PREV(x), (x) != NULL); \ (x) = (y)) #define RB_FOREACH_REVERSE_SAFE(x, name, head, y) \ for ((x) = RB_MAX(name, head); \ ((x) != NULL) && ((y) = name##_RB_PREV(x), (x) != NULL); \ (x) = (y)) #endif /* UV_TREE_H_ */