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---
tree.h (33874B)
---
1 /* $OpenBSD: tree.h,v 1.29 2017/07/30 19:27:20 deraadt Exp $ */
2 /*
3 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef _SYS_TREE_H_
28 #define _SYS_TREE_H_
29
30 /*
31 * This file defines data structures for different types of trees:
32 * splay trees and red-black trees.
33 *
34 * A splay tree is a self-organizing data structure. Every operation
35 * on the tree causes a splay to happen. The splay moves the requested
36 * node to the root of the tree and partly rebalances it.
37 *
38 * This has the benefit that request locality causes faster lookups as
39 * the requested nodes move to the top of the tree. On the other hand,
40 * every lookup causes memory writes.
41 *
42 * The Balance Theorem bounds the total access time for m operations
43 * and n inserts on an initially empty tree as O((m + n)lg n). The
44 * amortized cost for a sequence of m accesses to a splay tree is O(lg n);
45 *
46 * A red-black tree is a binary search tree with the node color as an
47 * extra attribute. It fulfills a set of conditions:
48 * - every search path from the root to a leaf consists of the
49 * same number of black nodes,
50 * - each red node (except for the root) has a black parent,
51 * - each leaf node is black.
52 *
53 * Every operation on a red-black tree is bounded as O(lg n).
54 * The maximum height of a red-black tree is 2lg (n+1).
55 */
56
57 #define SPLAY_HEAD(name, type) \
58 struct name { \
59 struct type *sph_root; /* root of the tree */ \
60 }
61
62 #define SPLAY_INITIALIZER(root) \
63 { NULL }
64
65 #define SPLAY_INIT(root) do { \
66 (root)->sph_root = NULL; \
67 } while (0)
68
69 #define SPLAY_ENTRY(type) \
70 struct { \
71 struct type *spe_left; /* left element */ \
72 struct type *spe_right; /* right element */ \
73 }
74
75 #define SPLAY_LEFT(elm, field) (elm)->field.spe_left
76 #define SPLAY_RIGHT(elm, field) (elm)->field.spe_right
77 #define SPLAY_ROOT(head) (head)->sph_root
78 #define SPLAY_EMPTY(head) (SPLAY_ROOT(head) == NULL)
79
80 /* SPLAY_ROTATE_{LEFT,RIGHT} expect that tmp hold SPLAY_{RIGHT,LEFT} */
81 #define SPLAY_ROTATE_RIGHT(head, tmp, field) do { \
82 SPLAY_LEFT((head)->sph_root, field) = SPLAY_RIGHT(tmp, field); \
83 SPLAY_RIGHT(tmp, field) = (head)->sph_root; \
84 (head)->sph_root = tmp; \
85 } while (0)
86
87 #define SPLAY_ROTATE_LEFT(head, tmp, field) do { \
88 SPLAY_RIGHT((head)->sph_root, field) = SPLAY_LEFT(tmp, field); \
89 SPLAY_LEFT(tmp, field) = (head)->sph_root; \
90 (head)->sph_root = tmp; \
91 } while (0)
92
93 #define SPLAY_LINKLEFT(head, tmp, field) do { \
94 SPLAY_LEFT(tmp, field) = (head)->sph_root; \
95 tmp = (head)->sph_root; \
96 (head)->sph_root = SPLAY_LEFT((head)->sph_root, field); \
97 } while (0)
98
99 #define SPLAY_LINKRIGHT(head, tmp, field) do { \
100 SPLAY_RIGHT(tmp, field) = (head)->sph_root; \
101 tmp = (head)->sph_root; \
102 (head)->sph_root = SPLAY_RIGHT((head)->sph_root, field); \
103 } while (0)
104
105 #define SPLAY_ASSEMBLE(head, node, left, right, field) do { \
106 SPLAY_RIGHT(left, field) = SPLAY_LEFT((head)->sph_root, field); \
107 SPLAY_LEFT(right, field) = SPLAY_RIGHT((head)->sph_root, field);\
108 SPLAY_LEFT((head)->sph_root, field) = SPLAY_RIGHT(node, field); \
109 SPLAY_RIGHT((head)->sph_root, field) = SPLAY_LEFT(node, field); \
110 } while (0)
111
112 /* Generates prototypes and inline functions */
113
114 #define SPLAY_PROTOTYPE(name, type, field, cmp) \
115 void name##_SPLAY(struct name *, struct type *); \
116 void name##_SPLAY_MINMAX(struct name *, int); \
117 struct type *name##_SPLAY_INSERT(struct name *, struct type *); \
118 struct type *name##_SPLAY_REMOVE(struct name *, struct type *); \
119 \
120 /* Finds the node with the same key as elm */ \
121 static __unused __inline struct type * \
122 name##_SPLAY_FIND(struct name *head, struct type *elm) \
123 { \
124 if (SPLAY_EMPTY(head)) \
125 return(NULL); \
126 name##_SPLAY(head, elm); \
127 if ((cmp)(elm, (head)->sph_root) == 0) \
128 return (head->sph_root); \
129 return (NULL); \
130 } \
131 \
132 static __unused __inline struct type * \
133 name##_SPLAY_NEXT(struct name *head, struct type *elm) \
134 { \
135 name##_SPLAY(head, elm); \
136 if (SPLAY_RIGHT(elm, field) != NULL) { \
137 elm = SPLAY_RIGHT(elm, field); \
138 while (SPLAY_LEFT(elm, field) != NULL) { \
139 elm = SPLAY_LEFT(elm, field); \
140 } \
141 } else \
142 elm = NULL; \
143 return (elm); \
144 } \
145 \
146 static __unused __inline struct type * \
147 name##_SPLAY_MIN_MAX(struct name *head, int val) \
148 { \
149 name##_SPLAY_MINMAX(head, val); \
150 return (SPLAY_ROOT(head)); \
151 }
152
153 /* Main splay operation.
154 * Moves node close to the key of elm to top
155 */
156 #define SPLAY_GENERATE(name, type, field, cmp) \
157 struct type * \
158 name##_SPLAY_INSERT(struct name *head, struct type *elm) \
159 { \
160 if (SPLAY_EMPTY(head)) { \
161 SPLAY_LEFT(elm, field) = SPLAY_RIGHT(elm, field) = NULL; \
162 } else { \
163 int __comp; \
164 name##_SPLAY(head, elm); \
165 __comp = (cmp)(elm, (head)->sph_root); \
166 if(__comp < 0) { \
167 SPLAY_LEFT(elm, field) = SPLAY_LEFT((head)->sph_root, field);\
168 SPLAY_RIGHT(elm, field) = (head)->sph_root; \
169 SPLAY_LEFT((head)->sph_root, field) = NULL; \
170 } else if (__comp > 0) { \
171 SPLAY_RIGHT(elm, field) = SPLAY_RIGHT((head)->sph_root, field);\
172 SPLAY_LEFT(elm, field) = (head)->sph_root; \
173 SPLAY_RIGHT((head)->sph_root, field) = NULL; \
174 } else \
175 return ((head)->sph_root); \
176 } \
177 (head)->sph_root = (elm); \
178 return (NULL); \
179 } \
180 \
181 struct type * \
182 name##_SPLAY_REMOVE(struct name *head, struct type *elm) \
183 { \
184 struct type *__tmp; \
185 if (SPLAY_EMPTY(head)) \
186 return (NULL); \
187 name##_SPLAY(head, elm); \
188 if ((cmp)(elm, (head)->sph_root) == 0) { \
189 if (SPLAY_LEFT((head)->sph_root, field) == NULL) { \
190 (head)->sph_root = SPLAY_RIGHT((head)->sph_root, field);\
191 } else { \
192 __tmp = SPLAY_RIGHT((head)->sph_root, field); \
193 (head)->sph_root = SPLAY_LEFT((head)->sph_root, field);\
194 name##_SPLAY(head, elm); \
195 SPLAY_RIGHT((head)->sph_root, field) = __tmp; \
196 } \
197 return (elm); \
198 } \
199 return (NULL); \
200 } \
201 \
202 void \
203 name##_SPLAY(struct name *head, struct type *elm) \
204 { \
205 struct type __node, *__left, *__right, *__tmp; \
206 int __comp; \
207 \
208 SPLAY_LEFT(&__node, field) = SPLAY_RIGHT(&__node, field) = NULL;\
209 __left = __right = &__node; \
210 \
211 while ((__comp = (cmp)(elm, (head)->sph_root))) { \
212 if (__comp < 0) { \
213 __tmp = SPLAY_LEFT((head)->sph_root, field); \
214 if (__tmp == NULL) \
215 break; \
216 if ((cmp)(elm, __tmp) < 0){ \
217 SPLAY_ROTATE_RIGHT(head, __tmp, field); \
218 if (SPLAY_LEFT((head)->sph_root, field) == NULL)\
219 break; \
220 } \
221 SPLAY_LINKLEFT(head, __right, field); \
222 } else if (__comp > 0) { \
223 __tmp = SPLAY_RIGHT((head)->sph_root, field); \
224 if (__tmp == NULL) \
225 break; \
226 if ((cmp)(elm, __tmp) > 0){ \
227 SPLAY_ROTATE_LEFT(head, __tmp, field); \
228 if (SPLAY_RIGHT((head)->sph_root, field) == NULL)\
229 break; \
230 } \
231 SPLAY_LINKRIGHT(head, __left, field); \
232 } \
233 } \
234 SPLAY_ASSEMBLE(head, &__node, __left, __right, field); \
235 } \
236 \
237 /* Splay with either the minimum or the maximum element \
238 * Used to find minimum or maximum element in tree. \
239 */ \
240 void name##_SPLAY_MINMAX(struct name *head, int __comp) \
241 { \
242 struct type __node, *__left, *__right, *__tmp; \
243 \
244 SPLAY_LEFT(&__node, field) = SPLAY_RIGHT(&__node, field) = NULL;\
245 __left = __right = &__node; \
246 \
247 while (1) { \
248 if (__comp < 0) { \
249 __tmp = SPLAY_LEFT((head)->sph_root, field); \
250 if (__tmp == NULL) \
251 break; \
252 if (__comp < 0){ \
253 SPLAY_ROTATE_RIGHT(head, __tmp, field); \
254 if (SPLAY_LEFT((head)->sph_root, field) == NULL)\
255 break; \
256 } \
257 SPLAY_LINKLEFT(head, __right, field); \
258 } else if (__comp > 0) { \
259 __tmp = SPLAY_RIGHT((head)->sph_root, field); \
260 if (__tmp == NULL) \
261 break; \
262 if (__comp > 0) { \
263 SPLAY_ROTATE_LEFT(head, __tmp, field); \
264 if (SPLAY_RIGHT((head)->sph_root, field) == NULL)\
265 break; \
266 } \
267 SPLAY_LINKRIGHT(head, __left, field); \
268 } \
269 } \
270 SPLAY_ASSEMBLE(head, &__node, __left, __right, field); \
271 }
272
273 #define SPLAY_NEGINF -1
274 #define SPLAY_INF 1
275
276 #define SPLAY_INSERT(name, x, y) name##_SPLAY_INSERT(x, y)
277 #define SPLAY_REMOVE(name, x, y) name##_SPLAY_REMOVE(x, y)
278 #define SPLAY_FIND(name, x, y) name##_SPLAY_FIND(x, y)
279 #define SPLAY_NEXT(name, x, y) name##_SPLAY_NEXT(x, y)
280 #define SPLAY_MIN(name, x) (SPLAY_EMPTY(x) ? NULL \
281 : name##_SPLAY_MIN_MAX(x, SPLAY_NEGINF))
282 #define SPLAY_MAX(name, x) (SPLAY_EMPTY(x) ? NULL \
283 : name##_SPLAY_MIN_MAX(x, SPLAY_INF))
284
285 #define SPLAY_FOREACH(x, name, head) \
286 for ((x) = SPLAY_MIN(name, head); \
287 (x) != NULL; \
288 (x) = SPLAY_NEXT(name, head, x))
289
290 /* Macros that define a red-black tree */
291 #define RB_HEAD(name, type) \
292 struct name { \
293 struct type *rbh_root; /* root of the tree */ \
294 }
295
296 #define RB_INITIALIZER(root) \
297 { NULL }
298
299 #define RB_INIT(root) do { \
300 (root)->rbh_root = NULL; \
301 } while (0)
302
303 #define RB_BLACK 0
304 #define RB_RED 1
305 #define RB_ENTRY(type) \
306 struct { \
307 struct type *rbe_left; /* left element */ \
308 struct type *rbe_right; /* right element */ \
309 struct type *rbe_parent; /* parent element */ \
310 int rbe_color; /* node color */ \
311 }
312
313 #define RB_LEFT(elm, field) (elm)->field.rbe_left
314 #define RB_RIGHT(elm, field) (elm)->field.rbe_right
315 #define RB_PARENT(elm, field) (elm)->field.rbe_parent
316 #define RB_COLOR(elm, field) (elm)->field.rbe_color
317 #define RB_ROOT(head) (head)->rbh_root
318 #define RB_EMPTY(head) (RB_ROOT(head) == NULL)
319
320 #define RB_SET(elm, parent, field) do { \
321 RB_PARENT(elm, field) = parent; \
322 RB_LEFT(elm, field) = RB_RIGHT(elm, field) = NULL; \
323 RB_COLOR(elm, field) = RB_RED; \
324 } while (0)
325
326 #define RB_SET_BLACKRED(black, red, field) do { \
327 RB_COLOR(black, field) = RB_BLACK; \
328 RB_COLOR(red, field) = RB_RED; \
329 } while (0)
330
331 #ifndef RB_AUGMENT
332 #define RB_AUGMENT(x) do {} while (0)
333 #endif
334
335 #define RB_ROTATE_LEFT(head, elm, tmp, field) do { \
336 (tmp) = RB_RIGHT(elm, field); \
337 if ((RB_RIGHT(elm, field) = RB_LEFT(tmp, field))) { \
338 RB_PARENT(RB_LEFT(tmp, field), field) = (elm); \
339 } \
340 RB_AUGMENT(elm); \
341 if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field))) { \
342 if ((elm) == RB_LEFT(RB_PARENT(elm, field), field)) \
343 RB_LEFT(RB_PARENT(elm, field), field) = (tmp); \
344 else \
345 RB_RIGHT(RB_PARENT(elm, field), field) = (tmp); \
346 } else \
347 (head)->rbh_root = (tmp); \
348 RB_LEFT(tmp, field) = (elm); \
349 RB_PARENT(elm, field) = (tmp); \
350 RB_AUGMENT(tmp); \
351 if ((RB_PARENT(tmp, field))) \
352 RB_AUGMENT(RB_PARENT(tmp, field)); \
353 } while (0)
354
355 #define RB_ROTATE_RIGHT(head, elm, tmp, field) do { \
356 (tmp) = RB_LEFT(elm, field); \
357 if ((RB_LEFT(elm, field) = RB_RIGHT(tmp, field))) { \
358 RB_PARENT(RB_RIGHT(tmp, field), field) = (elm); \
359 } \
360 RB_AUGMENT(elm); \
361 if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field))) { \
362 if ((elm) == RB_LEFT(RB_PARENT(elm, field), field)) \
363 RB_LEFT(RB_PARENT(elm, field), field) = (tmp); \
364 else \
365 RB_RIGHT(RB_PARENT(elm, field), field) = (tmp); \
366 } else \
367 (head)->rbh_root = (tmp); \
368 RB_RIGHT(tmp, field) = (elm); \
369 RB_PARENT(elm, field) = (tmp); \
370 RB_AUGMENT(tmp); \
371 if ((RB_PARENT(tmp, field))) \
372 RB_AUGMENT(RB_PARENT(tmp, field)); \
373 } while (0)
374
375 /* Generates prototypes and inline functions */
376 #define RB_PROTOTYPE(name, type, field, cmp) \
377 RB_PROTOTYPE_INTERNAL(name, type, field, cmp,)
378 #define RB_PROTOTYPE_STATIC(name, type, field, cmp) \
379 RB_PROTOTYPE_INTERNAL(name, type, field, cmp, __attribute__((__unused__)) static)
380 #define RB_PROTOTYPE_INTERNAL(name, type, field, cmp, attr) \
381 attr void name##_RB_INSERT_COLOR(struct name *, struct type *); \
382 attr void name##_RB_REMOVE_COLOR(struct name *, struct type *, struct type *);\
383 attr struct type *name##_RB_REMOVE(struct name *, struct type *); \
384 attr struct type *name##_RB_INSERT(struct name *, struct type *); \
385 attr struct type *name##_RB_FIND(struct name *, struct type *); \
386 attr struct type *name##_RB_NFIND(struct name *, struct type *); \
387 attr struct type *name##_RB_NEXT(struct type *); \
388 attr struct type *name##_RB_PREV(struct type *); \
389 attr struct type *name##_RB_MINMAX(struct name *, int); \
390 \
391
392 /* Main rb operation.
393 * Moves node close to the key of elm to top
394 */
395 #define RB_GENERATE(name, type, field, cmp) \
396 RB_GENERATE_INTERNAL(name, type, field, cmp,)
397 #define RB_GENERATE_STATIC(name, type, field, cmp) \
398 RB_GENERATE_INTERNAL(name, type, field, cmp, __attribute__((__unused__)) static)
399 #define RB_GENERATE_INTERNAL(name, type, field, cmp, attr) \
400 attr void \
401 name##_RB_INSERT_COLOR(struct name *head, struct type *elm) \
402 { \
403 struct type *parent, *gparent, *tmp; \
404 while ((parent = RB_PARENT(elm, field)) && \
405 RB_COLOR(parent, field) == RB_RED) { \
406 gparent = RB_PARENT(parent, field); \
407 if (parent == RB_LEFT(gparent, field)) { \
408 tmp = RB_RIGHT(gparent, field); \
409 if (tmp && RB_COLOR(tmp, field) == RB_RED) { \
410 RB_COLOR(tmp, field) = RB_BLACK; \
411 RB_SET_BLACKRED(parent, gparent, field);\
412 elm = gparent; \
413 continue; \
414 } \
415 if (RB_RIGHT(parent, field) == elm) { \
416 RB_ROTATE_LEFT(head, parent, tmp, field);\
417 tmp = parent; \
418 parent = elm; \
419 elm = tmp; \
420 } \
421 RB_SET_BLACKRED(parent, gparent, field); \
422 RB_ROTATE_RIGHT(head, gparent, tmp, field); \
423 } else { \
424 tmp = RB_LEFT(gparent, field); \
425 if (tmp && RB_COLOR(tmp, field) == RB_RED) { \
426 RB_COLOR(tmp, field) = RB_BLACK; \
427 RB_SET_BLACKRED(parent, gparent, field);\
428 elm = gparent; \
429 continue; \
430 } \
431 if (RB_LEFT(parent, field) == elm) { \
432 RB_ROTATE_RIGHT(head, parent, tmp, field);\
433 tmp = parent; \
434 parent = elm; \
435 elm = tmp; \
436 } \
437 RB_SET_BLACKRED(parent, gparent, field); \
438 RB_ROTATE_LEFT(head, gparent, tmp, field); \
439 } \
440 } \
441 RB_COLOR(head->rbh_root, field) = RB_BLACK; \
442 } \
443 \
444 attr void \
445 name##_RB_REMOVE_COLOR(struct name *head, struct type *parent, struct type *elm) \
446 { \
447 struct type *tmp; \
448 while ((elm == NULL || RB_COLOR(elm, field) == RB_BLACK) && \
449 elm != RB_ROOT(head)) { \
450 if (RB_LEFT(parent, field) == elm) { \
451 tmp = RB_RIGHT(parent, field); \
452 if (RB_COLOR(tmp, field) == RB_RED) { \
453 RB_SET_BLACKRED(tmp, parent, field); \
454 RB_ROTATE_LEFT(head, parent, tmp, field);\
455 tmp = RB_RIGHT(parent, field); \
456 } \
457 if ((RB_LEFT(tmp, field) == NULL || \
458 RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) &&\
459 (RB_RIGHT(tmp, field) == NULL || \
460 RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK)) {\
461 RB_COLOR(tmp, field) = RB_RED; \
462 elm = parent; \
463 parent = RB_PARENT(elm, field); \
464 } else { \
465 if (RB_RIGHT(tmp, field) == NULL || \
466 RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK) {\
467 struct type *oleft; \
468 if ((oleft = RB_LEFT(tmp, field)))\
469 RB_COLOR(oleft, field) = RB_BLACK;\
470 RB_COLOR(tmp, field) = RB_RED; \
471 RB_ROTATE_RIGHT(head, tmp, oleft, field);\
472 tmp = RB_RIGHT(parent, field); \
473 } \
474 RB_COLOR(tmp, field) = RB_COLOR(parent, field);\
475 RB_COLOR(parent, field) = RB_BLACK; \
476 if (RB_RIGHT(tmp, field)) \
477 RB_COLOR(RB_RIGHT(tmp, field), field) = RB_BLACK;\
478 RB_ROTATE_LEFT(head, parent, tmp, field);\
479 elm = RB_ROOT(head); \
480 break; \
481 } \
482 } else { \
483 tmp = RB_LEFT(parent, field); \
484 if (RB_COLOR(tmp, field) == RB_RED) { \
485 RB_SET_BLACKRED(tmp, parent, field); \
486 RB_ROTATE_RIGHT(head, parent, tmp, field);\
487 tmp = RB_LEFT(parent, field); \
488 } \
489 if ((RB_LEFT(tmp, field) == NULL || \
490 RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) &&\
491 (RB_RIGHT(tmp, field) == NULL || \
492 RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK)) {\
493 RB_COLOR(tmp, field) = RB_RED; \
494 elm = parent; \
495 parent = RB_PARENT(elm, field); \
496 } else { \
497 if (RB_LEFT(tmp, field) == NULL || \
498 RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) {\
499 struct type *oright; \
500 if ((oright = RB_RIGHT(tmp, field)))\
501 RB_COLOR(oright, field) = RB_BLACK;\
502 RB_COLOR(tmp, field) = RB_RED; \
503 RB_ROTATE_LEFT(head, tmp, oright, field);\
504 tmp = RB_LEFT(parent, field); \
505 } \
506 RB_COLOR(tmp, field) = RB_COLOR(parent, field);\
507 RB_COLOR(parent, field) = RB_BLACK; \
508 if (RB_LEFT(tmp, field)) \
509 RB_COLOR(RB_LEFT(tmp, field), field) = RB_BLACK;\
510 RB_ROTATE_RIGHT(head, parent, tmp, field);\
511 elm = RB_ROOT(head); \
512 break; \
513 } \
514 } \
515 } \
516 if (elm) \
517 RB_COLOR(elm, field) = RB_BLACK; \
518 } \
519 \
520 attr struct type * \
521 name##_RB_REMOVE(struct name *head, struct type *elm) \
522 { \
523 struct type *child, *parent, *old = elm; \
524 int color; \
525 if (RB_LEFT(elm, field) == NULL) \
526 child = RB_RIGHT(elm, field); \
527 else if (RB_RIGHT(elm, field) == NULL) \
528 child = RB_LEFT(elm, field); \
529 else { \
530 struct type *left; \
531 elm = RB_RIGHT(elm, field); \
532 while ((left = RB_LEFT(elm, field))) \
533 elm = left; \
534 child = RB_RIGHT(elm, field); \
535 parent = RB_PARENT(elm, field); \
536 color = RB_COLOR(elm, field); \
537 if (child) \
538 RB_PARENT(child, field) = parent; \
539 if (parent) { \
540 if (RB_LEFT(parent, field) == elm) \
541 RB_LEFT(parent, field) = child; \
542 else \
543 RB_RIGHT(parent, field) = child; \
544 RB_AUGMENT(parent); \
545 } else \
546 RB_ROOT(head) = child; \
547 if (RB_PARENT(elm, field) == old) \
548 parent = elm; \
549 (elm)->field = (old)->field; \
550 if (RB_PARENT(old, field)) { \
551 if (RB_LEFT(RB_PARENT(old, field), field) == old)\
552 RB_LEFT(RB_PARENT(old, field), field) = elm;\
553 else \
554 RB_RIGHT(RB_PARENT(old, field), field) = elm;\
555 RB_AUGMENT(RB_PARENT(old, field)); \
556 } else \
557 RB_ROOT(head) = elm; \
558 RB_PARENT(RB_LEFT(old, field), field) = elm; \
559 if (RB_RIGHT(old, field)) \
560 RB_PARENT(RB_RIGHT(old, field), field) = elm; \
561 if (parent) { \
562 left = parent; \
563 do { \
564 RB_AUGMENT(left); \
565 } while ((left = RB_PARENT(left, field))); \
566 } \
567 goto color; \
568 } \
569 parent = RB_PARENT(elm, field); \
570 color = RB_COLOR(elm, field); \
571 if (child) \
572 RB_PARENT(child, field) = parent; \
573 if (parent) { \
574 if (RB_LEFT(parent, field) == elm) \
575 RB_LEFT(parent, field) = child; \
576 else \
577 RB_RIGHT(parent, field) = child; \
578 RB_AUGMENT(parent); \
579 } else \
580 RB_ROOT(head) = child; \
581 color: \
582 if (color == RB_BLACK) \
583 name##_RB_REMOVE_COLOR(head, parent, child); \
584 return (old); \
585 } \
586 \
587 /* Inserts a node into the RB tree */ \
588 attr struct type * \
589 name##_RB_INSERT(struct name *head, struct type *elm) \
590 { \
591 struct type *tmp; \
592 struct type *parent = NULL; \
593 int comp = 0; \
594 tmp = RB_ROOT(head); \
595 while (tmp) { \
596 parent = tmp; \
597 comp = (cmp)(elm, parent); \
598 if (comp < 0) \
599 tmp = RB_LEFT(tmp, field); \
600 else if (comp > 0) \
601 tmp = RB_RIGHT(tmp, field); \
602 else \
603 return (tmp); \
604 } \
605 RB_SET(elm, parent, field); \
606 if (parent != NULL) { \
607 if (comp < 0) \
608 RB_LEFT(parent, field) = elm; \
609 else \
610 RB_RIGHT(parent, field) = elm; \
611 RB_AUGMENT(parent); \
612 } else \
613 RB_ROOT(head) = elm; \
614 name##_RB_INSERT_COLOR(head, elm); \
615 return (NULL); \
616 } \
617 \
618 /* Finds the node with the same key as elm */ \
619 attr struct type * \
620 name##_RB_FIND(struct name *head, struct type *elm) \
621 { \
622 struct type *tmp = RB_ROOT(head); \
623 int comp; \
624 while (tmp) { \
625 comp = cmp(elm, tmp); \
626 if (comp < 0) \
627 tmp = RB_LEFT(tmp, field); \
628 else if (comp > 0) \
629 tmp = RB_RIGHT(tmp, field); \
630 else \
631 return (tmp); \
632 } \
633 return (NULL); \
634 } \
635 \
636 /* Finds the first node greater than or equal to the search key */ \
637 attr struct type * \
638 name##_RB_NFIND(struct name *head, struct type *elm) \
639 { \
640 struct type *tmp = RB_ROOT(head); \
641 struct type *res = NULL; \
642 int comp; \
643 while (tmp) { \
644 comp = cmp(elm, tmp); \
645 if (comp < 0) { \
646 res = tmp; \
647 tmp = RB_LEFT(tmp, field); \
648 } \
649 else if (comp > 0) \
650 tmp = RB_RIGHT(tmp, field); \
651 else \
652 return (tmp); \
653 } \
654 return (res); \
655 } \
656 \
657 /* ARGSUSED */ \
658 attr struct type * \
659 name##_RB_NEXT(struct type *elm) \
660 { \
661 if (RB_RIGHT(elm, field)) { \
662 elm = RB_RIGHT(elm, field); \
663 while (RB_LEFT(elm, field)) \
664 elm = RB_LEFT(elm, field); \
665 } else { \
666 if (RB_PARENT(elm, field) && \
667 (elm == RB_LEFT(RB_PARENT(elm, field), field))) \
668 elm = RB_PARENT(elm, field); \
669 else { \
670 while (RB_PARENT(elm, field) && \
671 (elm == RB_RIGHT(RB_PARENT(elm, field), field)))\
672 elm = RB_PARENT(elm, field); \
673 elm = RB_PARENT(elm, field); \
674 } \
675 } \
676 return (elm); \
677 } \
678 \
679 /* ARGSUSED */ \
680 attr struct type * \
681 name##_RB_PREV(struct type *elm) \
682 { \
683 if (RB_LEFT(elm, field)) { \
684 elm = RB_LEFT(elm, field); \
685 while (RB_RIGHT(elm, field)) \
686 elm = RB_RIGHT(elm, field); \
687 } else { \
688 if (RB_PARENT(elm, field) && \
689 (elm == RB_RIGHT(RB_PARENT(elm, field), field))) \
690 elm = RB_PARENT(elm, field); \
691 else { \
692 while (RB_PARENT(elm, field) && \
693 (elm == RB_LEFT(RB_PARENT(elm, field), field)))\
694 elm = RB_PARENT(elm, field); \
695 elm = RB_PARENT(elm, field); \
696 } \
697 } \
698 return (elm); \
699 } \
700 \
701 attr struct type * \
702 name##_RB_MINMAX(struct name *head, int val) \
703 { \
704 struct type *tmp = RB_ROOT(head); \
705 struct type *parent = NULL; \
706 while (tmp) { \
707 parent = tmp; \
708 if (val < 0) \
709 tmp = RB_LEFT(tmp, field); \
710 else \
711 tmp = RB_RIGHT(tmp, field); \
712 } \
713 return (parent); \
714 }
715
716 #define RB_NEGINF -1
717 #define RB_INF 1
718
719 #define RB_INSERT(name, x, y) name##_RB_INSERT(x, y)
720 #define RB_REMOVE(name, x, y) name##_RB_REMOVE(x, y)
721 #define RB_FIND(name, x, y) name##_RB_FIND(x, y)
722 #define RB_NFIND(name, x, y) name##_RB_NFIND(x, y)
723 #define RB_NEXT(name, x, y) name##_RB_NEXT(y)
724 #define RB_PREV(name, x, y) name##_RB_PREV(y)
725 #define RB_MIN(name, x) name##_RB_MINMAX(x, RB_NEGINF)
726 #define RB_MAX(name, x) name##_RB_MINMAX(x, RB_INF)
727
728 #define RB_FOREACH(x, name, head) \
729 for ((x) = RB_MIN(name, head); \
730 (x) != NULL; \
731 (x) = name##_RB_NEXT(x))
732
733 #define RB_FOREACH_SAFE(x, name, head, y) \
734 for ((x) = RB_MIN(name, head); \
735 ((x) != NULL) && ((y) = name##_RB_NEXT(x), 1); \
736 (x) = (y))
737
738 #define RB_FOREACH_REVERSE(x, name, head) \
739 for ((x) = RB_MAX(name, head); \
740 (x) != NULL; \
741 (x) = name##_RB_PREV(x))
742
743 #define RB_FOREACH_REVERSE_SAFE(x, name, head, y) \
744 for ((x) = RB_MAX(name, head); \
745 ((x) != NULL) && ((y) = name##_RB_PREV(x), 1); \
746 (x) = (y))
747
748
749 /*
750 * Copyright (c) 2016 David Gwynne <dlg@openbsd.org>
751 *
752 * Permission to use, copy, modify, and distribute this software for any
753 * purpose with or without fee is hereby granted, provided that the above
754 * copyright notice and this permission notice appear in all copies.
755 *
756 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
757 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
758 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
759 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
760 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
761 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
762 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
763 */
764
765 struct rb_type {
766 int (*t_compare)(const void *, const void *);
767 void (*t_augment)(void *);
768 unsigned int t_offset; /* offset of rb_entry in type */
769 };
770
771 struct rb_tree {
772 struct rb_entry *rbt_root;
773 };
774
775 struct rb_entry {
776 struct rb_entry *rbt_parent;
777 struct rb_entry *rbt_left;
778 struct rb_entry *rbt_right;
779 unsigned int rbt_color;
780 };
781
782 #define RBT_HEAD(_name, _type) \
783 struct _name { \
784 struct rb_tree rbh_root; \
785 }
786
787 #define RBT_ENTRY(_type) struct rb_entry
788
789 static inline void
790 _rb_init(struct rb_tree *rbt)
791 {
792 rbt->rbt_root = NULL;
793 }
794
795 static inline int
796 _rb_empty(struct rb_tree *rbt)
797 {
798 return (rbt->rbt_root == NULL);
799 }
800
801 void *_rb_insert(const struct rb_type *, struct rb_tree *, void *);
802 void *_rb_remove(const struct rb_type *, struct rb_tree *, void *);
803 void *_rb_find(const struct rb_type *, struct rb_tree *, const void *);
804 void *_rb_nfind(const struct rb_type *, struct rb_tree *, const void *);
805 void *_rb_root(const struct rb_type *, struct rb_tree *);
806 void *_rb_min(const struct rb_type *, struct rb_tree *);
807 void *_rb_max(const struct rb_type *, struct rb_tree *);
808 void *_rb_next(const struct rb_type *, void *);
809 void *_rb_prev(const struct rb_type *, void *);
810 void *_rb_left(const struct rb_type *, void *);
811 void *_rb_right(const struct rb_type *, void *);
812 void *_rb_parent(const struct rb_type *, void *);
813 void _rb_set_left(const struct rb_type *, void *, void *);
814 void _rb_set_right(const struct rb_type *, void *, void *);
815 void _rb_set_parent(const struct rb_type *, void *, void *);
816 void _rb_poison(const struct rb_type *, void *, unsigned long);
817 int _rb_check(const struct rb_type *, void *, unsigned long);
818
819 #define RBT_INITIALIZER(_head) { { NULL } }
820
821 #define RBT_PROTOTYPE(_name, _type, _field, _cmp) \
822 extern const struct rb_type *const _name##_RBT_TYPE; \
823 \
824 __unused static inline void \
825 _name##_RBT_INIT(struct _name *head) \
826 { \
827 _rb_init(&head->rbh_root); \
828 } \
829 \
830 __unused static inline struct _type * \
831 _name##_RBT_INSERT(struct _name *head, struct _type *elm) \
832 { \
833 return _rb_insert(_name##_RBT_TYPE, &head->rbh_root, elm); \
834 } \
835 \
836 __unused static inline struct _type * \
837 _name##_RBT_REMOVE(struct _name *head, struct _type *elm) \
838 { \
839 return _rb_remove(_name##_RBT_TYPE, &head->rbh_root, elm); \
840 } \
841 \
842 __unused static inline struct _type * \
843 _name##_RBT_FIND(struct _name *head, const struct _type *key) \
844 { \
845 return _rb_find(_name##_RBT_TYPE, &head->rbh_root, key); \
846 } \
847 \
848 __unused static inline struct _type * \
849 _name##_RBT_NFIND(struct _name *head, const struct _type *key) \
850 { \
851 return _rb_nfind(_name##_RBT_TYPE, &head->rbh_root, key); \
852 } \
853 \
854 __unused static inline struct _type * \
855 _name##_RBT_ROOT(struct _name *head) \
856 { \
857 return _rb_root(_name##_RBT_TYPE, &head->rbh_root); \
858 } \
859 \
860 __unused static inline int \
861 _name##_RBT_EMPTY(struct _name *head) \
862 { \
863 return _rb_empty(&head->rbh_root); \
864 } \
865 \
866 __unused static inline struct _type * \
867 _name##_RBT_MIN(struct _name *head) \
868 { \
869 return _rb_min(_name##_RBT_TYPE, &head->rbh_root); \
870 } \
871 \
872 __unused static inline struct _type * \
873 _name##_RBT_MAX(struct _name *head) \
874 { \
875 return _rb_max(_name##_RBT_TYPE, &head->rbh_root); \
876 } \
877 \
878 __unused static inline struct _type * \
879 _name##_RBT_NEXT(struct _type *elm) \
880 { \
881 return _rb_next(_name##_RBT_TYPE, elm); \
882 } \
883 \
884 __unused static inline struct _type * \
885 _name##_RBT_PREV(struct _type *elm) \
886 { \
887 return _rb_prev(_name##_RBT_TYPE, elm); \
888 } \
889 \
890 __unused static inline struct _type * \
891 _name##_RBT_LEFT(struct _type *elm) \
892 { \
893 return _rb_left(_name##_RBT_TYPE, elm); \
894 } \
895 \
896 __unused static inline struct _type * \
897 _name##_RBT_RIGHT(struct _type *elm) \
898 { \
899 return _rb_right(_name##_RBT_TYPE, elm); \
900 } \
901 \
902 __unused static inline struct _type * \
903 _name##_RBT_PARENT(struct _type *elm) \
904 { \
905 return _rb_parent(_name##_RBT_TYPE, elm); \
906 } \
907 \
908 __unused static inline void \
909 _name##_RBT_SET_LEFT(struct _type *elm, struct _type *left) \
910 { \
911 return _rb_set_left(_name##_RBT_TYPE, elm, left); \
912 } \
913 \
914 __unused static inline void \
915 _name##_RBT_SET_RIGHT(struct _type *elm, struct _type *right) \
916 { \
917 return _rb_set_right(_name##_RBT_TYPE, elm, right); \
918 } \
919 \
920 __unused static inline void \
921 _name##_RBT_SET_PARENT(struct _type *elm, struct _type *parent) \
922 { \
923 return _rb_set_parent(_name##_RBT_TYPE, elm, parent); \
924 } \
925 \
926 __unused static inline void \
927 _name##_RBT_POISON(struct _type *elm, unsigned long poison) \
928 { \
929 return _rb_poison(_name##_RBT_TYPE, elm, poison); \
930 } \
931 \
932 __unused static inline int \
933 _name##_RBT_CHECK(struct _type *elm, unsigned long poison) \
934 { \
935 return _rb_check(_name##_RBT_TYPE, elm, poison); \
936 }
937
938 #define RBT_GENERATE_INTERNAL(_name, _type, _field, _cmp, _aug) \
939 static int \
940 _name##_RBT_COMPARE(const void *lptr, const void *rptr) \
941 { \
942 const struct _type *l = lptr, *r = rptr; \
943 return _cmp(l, r); \
944 } \
945 static const struct rb_type _name##_RBT_INFO = { \
946 _name##_RBT_COMPARE, \
947 _aug, \
948 offsetof(struct _type, _field), \
949 }; \
950 const struct rb_type *const _name##_RBT_TYPE = &_name##_RBT_INFO
951
952 #define RBT_GENERATE_AUGMENT(_name, _type, _field, _cmp, _aug) \
953 static void \
954 _name##_RBT_AUGMENT(void *ptr) \
955 { \
956 struct _type *p = ptr; \
957 return _aug(p); \
958 } \
959 RBT_GENERATE_INTERNAL(_name, _type, _field, _cmp, _name##_RBT_AUGMENT)
960
961 #define RBT_GENERATE(_name, _type, _field, _cmp) \
962 RBT_GENERATE_INTERNAL(_name, _type, _field, _cmp, NULL)
963
964 #define RBT_INIT(_name, _head) _name##_RBT_INIT(_head)
965 #define RBT_INSERT(_name, _head, _elm) _name##_RBT_INSERT(_head, _elm)
966 #define RBT_REMOVE(_name, _head, _elm) _name##_RBT_REMOVE(_head, _elm)
967 #define RBT_FIND(_name, _head, _key) _name##_RBT_FIND(_head, _key)
968 #define RBT_NFIND(_name, _head, _key) _name##_RBT_NFIND(_head, _key)
969 #define RBT_ROOT(_name, _head) _name##_RBT_ROOT(_head)
970 #define RBT_EMPTY(_name, _head) _name##_RBT_EMPTY(_head)
971 #define RBT_MIN(_name, _head) _name##_RBT_MIN(_head)
972 #define RBT_MAX(_name, _head) _name##_RBT_MAX(_head)
973 #define RBT_NEXT(_name, _elm) _name##_RBT_NEXT(_elm)
974 #define RBT_PREV(_name, _elm) _name##_RBT_PREV(_elm)
975 #define RBT_LEFT(_name, _elm) _name##_RBT_LEFT(_elm)
976 #define RBT_RIGHT(_name, _elm) _name##_RBT_RIGHT(_elm)
977 #define RBT_PARENT(_name, _elm) _name##_RBT_PARENT(_elm)
978 #define RBT_SET_LEFT(_name, _elm, _l) _name##_RBT_SET_LEFT(_elm, _l)
979 #define RBT_SET_RIGHT(_name, _elm, _r) _name##_RBT_SET_RIGHT(_elm, _r)
980 #define RBT_SET_PARENT(_name, _elm, _p) _name##_RBT_SET_PARENT(_elm, _p)
981 #define RBT_POISON(_name, _elm, _p) _name##_RBT_POISON(_elm, _p)
982 #define RBT_CHECK(_name, _elm, _p) _name##_RBT_CHECK(_elm, _p)
983
984 #define RBT_FOREACH(_e, _name, _head) \
985 for ((_e) = RBT_MIN(_name, (_head)); \
986 (_e) != NULL; \
987 (_e) = RBT_NEXT(_name, (_e)))
988
989 #define RBT_FOREACH_SAFE(_e, _name, _head, _n) \
990 for ((_e) = RBT_MIN(_name, (_head)); \
991 (_e) != NULL && ((_n) = RBT_NEXT(_name, (_e)), 1); \
992 (_e) = (_n))
993
994 #define RBT_FOREACH_REVERSE(_e, _name, _head) \
995 for ((_e) = RBT_MAX(_name, (_head)); \
996 (_e) != NULL; \
997 (_e) = RBT_PREV(_name, (_e)))
998
999 #define RBT_FOREACH_REVERSE_SAFE(_e, _name, _head, _n) \
1000 for ((_e) = RBT_MAX(_name, (_head)); \
1001 (_e) != NULL && ((_n) = RBT_PREV(_name, (_e)), 1); \
1002 (_e) = (_n))
1003
1004 #endif /* _SYS_TREE_H_ */
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