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3a93244ed8
This version adds support for prefix-based matching of memory blocks, as well as some code-size and performance improvements on the generic code. It provides a prefix insertion and longest match which are compatible with the rest of the common features (walk, duplicates, delete, ...). This is typically used for network address matching. The longest-match code is a bit slower than the original memory block handling code, so they have not been merged together into generic code. Still it's possible to perform about 10 million networks lookups per second in a set of 50000, so this should be enough for most usages. This version also fixes some bugs in parts that were not used, so there is no need to backport them.
166 lines
5.4 KiB
C
166 lines
5.4 KiB
C
/*
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* Elastic Binary Trees - macros and structures for operations on pointer nodes.
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* Version 6.0
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* (C) 2002-2010 - Willy Tarreau <w@1wt.eu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _EBPTTREE_H
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#define _EBPTTREE_H
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#include "ebtree.h"
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#include "eb32tree.h"
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#include "eb64tree.h"
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/* Return the structure of type <type> whose member <member> points to <ptr> */
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#define ebpt_entry(ptr, type, member) container_of(ptr, type, member)
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#define EBPT_ROOT EB_ROOT
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#define EBPT_TREE_HEAD EB_TREE_HEAD
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/* on *almost* all platforms, a pointer can be cast into a size_t which is unsigned */
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#ifndef PTR_INT_TYPE
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#define PTR_INT_TYPE size_t
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#endif
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typedef PTR_INT_TYPE ptr_t;
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/* This structure carries a node, a leaf, and a key. It must start with the
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* eb_node so that it can be cast into an eb_node. We could also have put some
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* sort of transparent union here to reduce the indirection level, but the fact
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* is, the end user is not meant to manipulate internals, so this is pointless.
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* Internally, it is automatically cast as an eb32_node or eb64_node.
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*/
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struct ebpt_node {
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struct eb_node node; /* the tree node, must be at the beginning */
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void *key;
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};
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/*
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* Exported functions and macros.
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* Many of them are always inlined because they are extremely small, and
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* are generally called at most once or twice in a program.
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*/
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/* Return leftmost node in the tree, or NULL if none */
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static forceinline struct ebpt_node *ebpt_first(struct eb_root *root)
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{
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return ebpt_entry(eb_first(root), struct ebpt_node, node);
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}
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/* Return rightmost node in the tree, or NULL if none */
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static forceinline struct ebpt_node *ebpt_last(struct eb_root *root)
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{
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return ebpt_entry(eb_last(root), struct ebpt_node, node);
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}
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/* Return next node in the tree, or NULL if none */
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static forceinline struct ebpt_node *ebpt_next(struct ebpt_node *ebpt)
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{
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return ebpt_entry(eb_next(&ebpt->node), struct ebpt_node, node);
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}
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/* Return previous node in the tree, or NULL if none */
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static forceinline struct ebpt_node *ebpt_prev(struct ebpt_node *ebpt)
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{
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return ebpt_entry(eb_prev(&ebpt->node), struct ebpt_node, node);
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}
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/* Return next node in the tree, skipping duplicates, or NULL if none */
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static forceinline struct ebpt_node *ebpt_next_unique(struct ebpt_node *ebpt)
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{
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return ebpt_entry(eb_next_unique(&ebpt->node), struct ebpt_node, node);
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}
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/* Return previous node in the tree, skipping duplicates, or NULL if none */
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static forceinline struct ebpt_node *ebpt_prev_unique(struct ebpt_node *ebpt)
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{
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return ebpt_entry(eb_prev_unique(&ebpt->node), struct ebpt_node, node);
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}
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/* Delete node from the tree if it was linked in. Mark the node unused. Note
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* that this function relies on a non-inlined generic function: eb_delete.
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*/
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static forceinline void ebpt_delete(struct ebpt_node *ebpt)
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{
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eb_delete(&ebpt->node);
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}
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/*
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* The following functions are inlined but derived from the integer versions.
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*/
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static forceinline struct ebpt_node *ebpt_lookup(struct eb_root *root, void *x)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)eb32_lookup(root, (u32)(PTR_INT_TYPE)x);
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else
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return (struct ebpt_node *)eb64_lookup(root, (u64)(PTR_INT_TYPE)x);
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}
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static forceinline struct ebpt_node *ebpt_lookup_le(struct eb_root *root, void *x)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)eb32_lookup_le(root, (u32)(PTR_INT_TYPE)x);
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else
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return (struct ebpt_node *)eb64_lookup_le(root, (u64)(PTR_INT_TYPE)x);
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}
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static forceinline struct ebpt_node *ebpt_lookup_ge(struct eb_root *root, void *x)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)eb32_lookup_ge(root, (u32)(PTR_INT_TYPE)x);
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else
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return (struct ebpt_node *)eb64_lookup_ge(root, (u64)(PTR_INT_TYPE)x);
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}
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static forceinline struct ebpt_node *ebpt_insert(struct eb_root *root, struct ebpt_node *new)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)eb32_insert(root, (struct eb32_node *)new);
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else
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return (struct ebpt_node *)eb64_insert(root, (struct eb64_node *)new);
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}
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/*
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* The following functions are less likely to be used directly, because
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* their code is larger. The non-inlined version is preferred.
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*/
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/* Delete node from the tree if it was linked in. Mark the node unused. */
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static forceinline void __ebpt_delete(struct ebpt_node *ebpt)
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{
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__eb_delete(&ebpt->node);
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}
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static forceinline struct ebpt_node *__ebpt_lookup(struct eb_root *root, void *x)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)__eb32_lookup(root, (u32)(PTR_INT_TYPE)x);
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else
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return (struct ebpt_node *)__eb64_lookup(root, (u64)(PTR_INT_TYPE)x);
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}
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static forceinline struct ebpt_node *__ebpt_insert(struct eb_root *root, struct ebpt_node *new)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)__eb32_insert(root, (struct eb32_node *)new);
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else
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return (struct ebpt_node *)__eb64_insert(root, (struct eb64_node *)new);
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}
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#endif /* _EBPT_TREE_H */
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