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-rw-r--r--src/common/tree.h251
1 files changed, 2 insertions, 249 deletions
diff --git a/src/common/tree.h b/src/common/tree.h
index a6b636646..4a295f894 100644
--- a/src/common/tree.h
+++ b/src/common/tree.h
@@ -27,33 +27,10 @@
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-#ifndef _SYS_TREE_H_
-#define _SYS_TREE_H_
-
-/* FreeBSD <sys/cdefs.h> has a lot of defines we don't really want. */
-/* tree.h only actually uses __inline and __unused, so we'll just define those. */
-
-/* #include <sys/cdefs.h> */
-
-#ifndef __inline
-#define __inline inline
-#endif
+#pragma once
/*
- * This file defines data structures for different types of trees:
- * splay trees and red-black trees.
- *
- * A splay tree is a self-organizing data structure. Every operation
- * on the tree causes a splay to happen. The splay moves the requested
- * node to the root of the tree and partly rebalances it.
- *
- * This has the benefit that request locality causes faster lookups as
- * the requested nodes move to the top of the tree. On the other hand,
- * every lookup causes memory writes.
- *
- * The Balance Theorem bounds the total access time for m operations
- * and n inserts on an initially empty tree as O((m + n)lg n). The
- * amortized cost for a sequence of m accesses to a splay tree is O(lg n);
+ * 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:
@@ -66,228 +43,6 @@
* The maximum height of a red-black tree is 2lg (n+1).
*/
-#define SPLAY_HEAD(name, type) \
- struct name { \
- struct type* sph_root; /* root of the tree */ \
- }
-
-#define SPLAY_INITIALIZER(root) \
- { NULL }
-
-#define SPLAY_INIT(root) \
- do { \
- (root)->sph_root = NULL; \
- } while (/*CONSTCOND*/ 0)
-
-#define SPLAY_ENTRY(type) \
- struct { \
- struct type* spe_left; /* left element */ \
- struct type* spe_right; /* right element */ \
- }
-
-#define SPLAY_LEFT(elm, field) (elm)->field.spe_left
-#define SPLAY_RIGHT(elm, field) (elm)->field.spe_right
-#define SPLAY_ROOT(head) (head)->sph_root
-#define SPLAY_EMPTY(head) (SPLAY_ROOT(head) == NULL)
-
-/* SPLAY_ROTATE_{LEFT,RIGHT} expect that tmp hold SPLAY_{RIGHT,LEFT} */
-#define SPLAY_ROTATE_RIGHT(head, tmp, field) \
- do { \
- SPLAY_LEFT((head)->sph_root, field) = SPLAY_RIGHT(tmp, field); \
- SPLAY_RIGHT(tmp, field) = (head)->sph_root; \
- (head)->sph_root = tmp; \
- } while (/*CONSTCOND*/ 0)
-
-#define SPLAY_ROTATE_LEFT(head, tmp, field) \
- do { \
- SPLAY_RIGHT((head)->sph_root, field) = SPLAY_LEFT(tmp, field); \
- SPLAY_LEFT(tmp, field) = (head)->sph_root; \
- (head)->sph_root = tmp; \
- } while (/*CONSTCOND*/ 0)
-
-#define SPLAY_LINKLEFT(head, tmp, field) \
- do { \
- SPLAY_LEFT(tmp, field) = (head)->sph_root; \
- tmp = (head)->sph_root; \
- (head)->sph_root = SPLAY_LEFT((head)->sph_root, field); \
- } while (/*CONSTCOND*/ 0)
-
-#define SPLAY_LINKRIGHT(head, tmp, field) \
- do { \
- SPLAY_RIGHT(tmp, field) = (head)->sph_root; \
- tmp = (head)->sph_root; \
- (head)->sph_root = SPLAY_RIGHT((head)->sph_root, field); \
- } while (/*CONSTCOND*/ 0)
-
-#define SPLAY_ASSEMBLE(head, node, left, right, field) \
- do { \
- SPLAY_RIGHT(left, field) = SPLAY_LEFT((head)->sph_root, field); \
- SPLAY_LEFT(right, field) = SPLAY_RIGHT((head)->sph_root, field); \
- SPLAY_LEFT((head)->sph_root, field) = SPLAY_RIGHT(node, field); \
- SPLAY_RIGHT((head)->sph_root, field) = SPLAY_LEFT(node, field); \
- } while (/*CONSTCOND*/ 0)
-
-/* Generates prototypes and inline functions */
-
-#define SPLAY_PROTOTYPE(name, type, field, cmp) \
- void name##_SPLAY(struct name*, struct type*); \
- void name##_SPLAY_MINMAX(struct name*, int); \
- struct type* name##_SPLAY_INSERT(struct name*, struct type*); \
- struct type* name##_SPLAY_REMOVE(struct name*, struct type*); \
- \
- /* Finds the node with the same key as elm */ \
- static __inline struct type* name##_SPLAY_FIND(struct name* head, struct type* elm) { \
- if (SPLAY_EMPTY(head)) \
- return (NULL); \
- name##_SPLAY(head, elm); \
- if ((cmp)(elm, (head)->sph_root) == 0) \
- return (head->sph_root); \
- return (NULL); \
- } \
- \
- static __inline struct type* name##_SPLAY_NEXT(struct name* head, struct type* elm) { \
- name##_SPLAY(head, elm); \
- if (SPLAY_RIGHT(elm, field) != NULL) { \
- elm = SPLAY_RIGHT(elm, field); \
- while (SPLAY_LEFT(elm, field) != NULL) { \
- elm = SPLAY_LEFT(elm, field); \
- } \
- } else \
- elm = NULL; \
- return (elm); \
- } \
- \
- static __inline struct type* name##_SPLAY_MIN_MAX(struct name* head, int val) { \
- name##_SPLAY_MINMAX(head, val); \
- return (SPLAY_ROOT(head)); \
- }
-
-/* Main splay operation.
- * Moves node close to the key of elm to top
- */
-#define SPLAY_GENERATE(name, type, field, cmp) \
- struct type* name##_SPLAY_INSERT(struct name* head, struct type* elm) { \
- if (SPLAY_EMPTY(head)) { \
- SPLAY_LEFT(elm, field) = SPLAY_RIGHT(elm, field) = NULL; \
- } else { \
- int __comp; \
- name##_SPLAY(head, elm); \
- __comp = (cmp)(elm, (head)->sph_root); \
- if (__comp < 0) { \
- SPLAY_LEFT(elm, field) = SPLAY_LEFT((head)->sph_root, field); \
- SPLAY_RIGHT(elm, field) = (head)->sph_root; \
- SPLAY_LEFT((head)->sph_root, field) = NULL; \
- } else if (__comp > 0) { \
- SPLAY_RIGHT(elm, field) = SPLAY_RIGHT((head)->sph_root, field); \
- SPLAY_LEFT(elm, field) = (head)->sph_root; \
- SPLAY_RIGHT((head)->sph_root, field) = NULL; \
- } else \
- return ((head)->sph_root); \
- } \
- (head)->sph_root = (elm); \
- return (NULL); \
- } \
- \
- struct type* name##_SPLAY_REMOVE(struct name* head, struct type* elm) { \
- struct type* __tmp; \
- if (SPLAY_EMPTY(head)) \
- return (NULL); \
- name##_SPLAY(head, elm); \
- if ((cmp)(elm, (head)->sph_root) == 0) { \
- if (SPLAY_LEFT((head)->sph_root, field) == NULL) { \
- (head)->sph_root = SPLAY_RIGHT((head)->sph_root, field); \
- } else { \
- __tmp = SPLAY_RIGHT((head)->sph_root, field); \
- (head)->sph_root = SPLAY_LEFT((head)->sph_root, field); \
- name##_SPLAY(head, elm); \
- SPLAY_RIGHT((head)->sph_root, field) = __tmp; \
- } \
- return (elm); \
- } \
- return (NULL); \
- } \
- \
- void name##_SPLAY(struct name* head, struct type* elm) { \
- struct type __node, *__left, *__right, *__tmp; \
- int __comp; \
- \
- SPLAY_LEFT(&__node, field) = SPLAY_RIGHT(&__node, field) = NULL; \
- __left = __right = &__node; \
- \
- while ((__comp = (cmp)(elm, (head)->sph_root)) != 0) { \
- if (__comp < 0) { \
- __tmp = SPLAY_LEFT((head)->sph_root, field); \
- if (__tmp == NULL) \
- break; \
- if ((cmp)(elm, __tmp) < 0) { \
- SPLAY_ROTATE_RIGHT(head, __tmp, field); \
- if (SPLAY_LEFT((head)->sph_root, field) == NULL) \
- break; \
- } \
- SPLAY_LINKLEFT(head, __right, field); \
- } else if (__comp > 0) { \
- __tmp = SPLAY_RIGHT((head)->sph_root, field); \
- if (__tmp == NULL) \
- break; \
- if ((cmp)(elm, __tmp) > 0) { \
- SPLAY_ROTATE_LEFT(head, __tmp, field); \
- if (SPLAY_RIGHT((head)->sph_root, field) == NULL) \
- break; \
- } \
- SPLAY_LINKRIGHT(head, __left, field); \
- } \
- } \
- SPLAY_ASSEMBLE(head, &__node, __left, __right, field); \
- } \
- \
- /* Splay with either the minimum or the maximum element \
- * Used to find minimum or maximum element in tree. \
- */ \
- void name##_SPLAY_MINMAX(struct name* head, int __comp) { \
- struct type __node, *__left, *__right, *__tmp; \
- \
- SPLAY_LEFT(&__node, field) = SPLAY_RIGHT(&__node, field) = NULL; \
- __left = __right = &__node; \
- \
- while (1) { \
- if (__comp < 0) { \
- __tmp = SPLAY_LEFT((head)->sph_root, field); \
- if (__tmp == NULL) \
- break; \
- if (__comp < 0) { \
- SPLAY_ROTATE_RIGHT(head, __tmp, field); \
- if (SPLAY_LEFT((head)->sph_root, field) == NULL) \
- break; \
- } \
- SPLAY_LINKLEFT(head, __right, field); \
- } else if (__comp > 0) { \
- __tmp = SPLAY_RIGHT((head)->sph_root, field); \
- if (__tmp == NULL) \
- break; \
- if (__comp > 0) { \
- SPLAY_ROTATE_LEFT(head, __tmp, field); \
- if (SPLAY_RIGHT((head)->sph_root, field) == NULL) \
- break; \
- } \
- SPLAY_LINKRIGHT(head, __left, field); \
- } \
- } \
- SPLAY_ASSEMBLE(head, &__node, __left, __right, field); \
- }
-
-#define SPLAY_NEGINF -1
-#define SPLAY_INF 1
-
-#define SPLAY_INSERT(name, x, y) name##_SPLAY_INSERT(x, y)
-#define SPLAY_REMOVE(name, x, y) name##_SPLAY_REMOVE(x, y)
-#define SPLAY_FIND(name, x, y) name##_SPLAY_FIND(x, y)
-#define SPLAY_NEXT(name, x, y) name##_SPLAY_NEXT(x, y)
-#define SPLAY_MIN(name, x) (SPLAY_EMPTY(x) ? NULL : name##_SPLAY_MIN_MAX(x, SPLAY_NEGINF))
-#define SPLAY_MAX(name, x) (SPLAY_EMPTY(x) ? NULL : name##_SPLAY_MIN_MAX(x, SPLAY_INF))
-
-#define SPLAY_FOREACH(x, name, head) \
- for ((x) = SPLAY_MIN(name, head); (x) != NULL; (x) = SPLAY_NEXT(name, head, x))
-
/* Macros that define a red-black tree */
#define RB_HEAD(name, type) \
struct name { \
@@ -818,5 +573,3 @@
#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 /* _SYS_TREE_H_ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 15:15:37 +0100