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Diffstat (limited to 'include/my_tree.h')
| -rw-r--r-- | include/my_tree.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/include/my_tree.h b/include/my_tree.h new file mode 100644 index 00000000..9bed28ef --- /dev/null +++ b/include/my_tree.h @@ -0,0 +1,109 @@ +/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ + +#ifndef _tree_h +#define _tree_h +#ifdef __cplusplus +extern "C" { +#endif + +#include "my_base.h" /* get 'enum ha_rkey_function' */ +#include "my_alloc.h" /* MEM_ROOT */ + +/* Worst case tree is half full. This gives use 2^(MAX_TREE_HEIGHT/2) leafs */ +#define MAX_TREE_HEIGHT 64 + +#define ELEMENT_KEY(tree,element)\ +(tree->offset_to_key ? (void*)((uchar*) element+tree->offset_to_key) :\ + *((void**) (element+1))) + +#define tree_set_pointer(element,ptr) *((uchar **) (element+1))=((uchar*) (ptr)) + +/* + A tree with its flag set to TREE_ONLY_DUPS behaves differently on inserting + an element that is not in the tree: + the element is not added at all, but instead tree_insert() returns a special + address TREE_ELEMENT_UNIQUE as an indication that the function has not failed + due to lack of memory. +*/ + +#define TREE_ELEMENT_UNIQUE ((TREE_ELEMENT *) 1) +#define TREE_NO_DUPS 1 +#define TREE_ONLY_DUPS 2 + +typedef enum { left_root_right, right_root_left } TREE_WALK; +typedef uint32 element_count; +typedef int (*tree_walk_action)(void *,element_count,void *); + +typedef enum { free_init, free_free, free_end } TREE_FREE; +typedef int (*tree_element_free)(void*, TREE_FREE, void *); + +typedef struct st_tree_element { + struct st_tree_element *left,*right; + uint32 count:31, + colour:1; /* black is marked as 1 */ +} TREE_ELEMENT; + +#define ELEMENT_CHILD(element, offs) (*(TREE_ELEMENT**)((char*)element + offs)) + +typedef struct st_tree { + TREE_ELEMENT *root; + TREE_ELEMENT **parents[MAX_TREE_HEIGHT]; + uint offset_to_key,elements_in_tree,size_of_element; + size_t memory_limit, allocated; + qsort_cmp2 compare; + void *custom_arg; + MEM_ROOT mem_root; + my_bool with_delete; + tree_element_free free; + myf my_flags; + uint flag; +} TREE; + + /* Functions on whole tree */ +void init_tree(TREE *tree, size_t default_alloc_size, size_t memory_limit, + int size, qsort_cmp2 compare, + tree_element_free free_element, void *custom_arg, + myf my_flags); +int delete_tree(TREE*, my_bool abort); +int reset_tree(TREE*); + + /* similar to delete tree, except we do not my_free() blocks in mem_root */ +#define is_tree_inited(tree) ((tree)->root != 0) + + /* Functions on leafs */ +TREE_ELEMENT *tree_insert(TREE *tree,void *key, uint key_size, + void *custom_arg); +void *tree_search(TREE *tree, void *key, void *custom_arg); +int tree_walk(TREE *tree,tree_walk_action action, + void *argument, TREE_WALK visit); +int tree_delete(TREE *tree, void *key, uint key_size, void *custom_arg); +void *tree_search_key(TREE *tree, const void *key, + TREE_ELEMENT **parents, TREE_ELEMENT ***last_pos, + enum ha_rkey_function flag, void *custom_arg); +void *tree_search_edge(TREE *tree, TREE_ELEMENT **parents, + TREE_ELEMENT ***last_pos, int child_offs); +void *tree_search_next(TREE *tree, TREE_ELEMENT ***last_pos, int l_offs, + int r_offs); +ha_rows tree_record_pos(TREE *tree, const void *key, + enum ha_rkey_function search_flag, void *custom_arg); +#define reset_free_element(tree) (tree)->free= 0 + +#define TREE_ELEMENT_EXTRA_SIZE (sizeof(TREE_ELEMENT) + sizeof(void*)) + +#ifdef __cplusplus +} +#endif +#endif |