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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 12:18:05 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 12:18:05 +0000 |
commit | b46aad6df449445a9fc4aa7b32bd40005438e3f7 (patch) | |
tree | 751aa858ca01f35de800164516b298887382919d /include/import/eb32sctree.h | |
parent | Initial commit. (diff) | |
download | haproxy-b46aad6df449445a9fc4aa7b32bd40005438e3f7.tar.xz haproxy-b46aad6df449445a9fc4aa7b32bd40005438e3f7.zip |
Adding upstream version 2.9.5.upstream/2.9.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/import/eb32sctree.h')
-rw-r--r-- | include/import/eb32sctree.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/include/import/eb32sctree.h b/include/import/eb32sctree.h new file mode 100644 index 0000000..5ace662 --- /dev/null +++ b/include/import/eb32sctree.h @@ -0,0 +1,121 @@ +/* + * Elastic Binary Trees - macros and structures for operations on 32bit nodes. + * Version 6.0.6 with backports from v7-dev + * (C) 2002-2017 - Willy Tarreau <w@1wt.eu> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation, version 2.1 + * exclusively. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef _EB32SCTREE_H +#define _EB32SCTREE_H + +#include "ebtree.h" + + +/* Return the structure of type <type> whose member <member> points to <ptr> */ +#define eb32sc_entry(ptr, type, member) container_of(ptr, type, member) + +/* + * Exported functions and macros. + * Many of them are always inlined because they are extremely small, and + * are generally called at most once or twice in a program. + */ + +/* + * The following functions are not inlined by default. They are declared + * in eb32sctree.c, which simply relies on their inline version. + */ +struct eb32sc_node *eb32sc_lookup_ge(struct eb_root *root, u32 x, unsigned long scope); +struct eb32sc_node *eb32sc_lookup_ge_or_first(struct eb_root *root, u32 x, unsigned long scope); +struct eb32sc_node *eb32sc_insert(struct eb_root *root, struct eb32sc_node *new, unsigned long scope); +void eb32sc_delete(struct eb32sc_node *node); + +/* Walks down left starting at root pointer <start>, and follow the leftmost + * branch whose scope matches <scope>. It either returns the node hosting the + * first leaf on that side, or NULL if no leaf is found. <start> may either be + * NULL or a branch pointer. The pointer to the leaf (or NULL) is returned. + */ +static inline struct eb32sc_node *eb32sc_walk_down_left(eb_troot_t *start, unsigned long scope) +{ + struct eb_root *root; + struct eb_node *node; + struct eb32sc_node *eb32; + + if (unlikely(!start)) + return NULL; + + while (1) { + if (eb_gettag(start) == EB_NODE) { + root = eb_untag(start, EB_NODE); + node = eb_root_to_node(root); + eb32 = container_of(node, struct eb32sc_node, node); + if (eb32->node_s & scope) { + start = node->branches.b[EB_LEFT]; + continue; + } + start = node->node_p; + } + else { + root = eb_untag(start, EB_LEAF); + node = eb_root_to_node(root); + eb32 = container_of(node, struct eb32sc_node, node); + if (eb32->leaf_s & scope) + return eb32; + start = node->leaf_p; + } + + /* here we're on a node that doesn't match the scope. We have + * to walk to the closest right location. + */ + while (eb_gettag(start) != EB_LEFT) + /* Walking up from right branch, so we cannot be below root */ + start = (eb_root_to_node(eb_untag(start, EB_RGHT)))->node_p; + + /* Note that <start> cannot be NULL at this stage */ + root = eb_untag(start, EB_LEFT); + start = root->b[EB_RGHT]; + if (eb_clrtag(start) == NULL) + return NULL; + } +} + +/* Return next node in the tree, starting with tagged parent <start>, or NULL if none */ +static inline struct eb32sc_node *eb32sc_next_with_parent(eb_troot_t *start, unsigned long scope) +{ + while (eb_gettag(start) != EB_LEFT) + /* Walking up from right branch, so we cannot be below root */ + start = (eb_root_to_node(eb_untag(start, EB_RGHT)))->node_p; + + /* Note that <t> cannot be NULL at this stage */ + start = (eb_untag(start, EB_LEFT))->b[EB_RGHT]; + if (eb_clrtag(start) == NULL) + return NULL; + + return eb32sc_walk_down_left(start, scope); +} + +/* Return next node in the tree, or NULL if none */ +static inline struct eb32sc_node *eb32sc_next(struct eb32sc_node *eb32, unsigned long scope) +{ + return eb32sc_next_with_parent(eb32->node.leaf_p, scope); +} + +/* Return leftmost node in the tree, or NULL if none */ +static inline struct eb32sc_node *eb32sc_first(struct eb_root *root, unsigned long scope) +{ + return eb32sc_walk_down_left(root->b[0], scope); +} + +#endif /* _EB32SC_TREE_H */ |