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Diffstat (limited to 'erts/emulator/beam/erl_db_tree_util.h')
| -rw-r--r-- | erts/emulator/beam/erl_db_tree_util.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_db_tree_util.h b/erts/emulator/beam/erl_db_tree_util.h new file mode 100644 index 0000000000..fbd9a9124a --- /dev/null +++ b/erts/emulator/beam/erl_db_tree_util.h @@ -0,0 +1,151 @@ +/* + * %CopyrightBegin% + * + * Copyright Ericsson AB 1998-2016. All Rights Reserved. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * %CopyrightEnd% + */ + +#ifndef _DB_TREE_UTIL_H +#define _DB_TREE_UTIL_H + +/* +** Internal functions and macros used by both the CA tree and the AVL tree +*/ + +/* +** A stack of this size is enough for an AVL tree with more than +** 0xFFFFFFFF elements. May be subject to change if +** the datatype of the element counter is changed to a 64 bit integer. +** The Maximal height of an AVL tree is calculated as: +** h(n) <= 1.4404 * log(n + 2) - 0.328 +** Where n denotes the number of nodes, h(n) the height of the tree +** with n nodes and log is the binary logarithm. +*/ + +#define STACK_NEED 50 + +#define PUSH_NODE(Dtt, Tdt) \ + ((Dtt)->array[(Dtt)->pos++] = Tdt) + +#define POP_NODE(Dtt) \ + (((Dtt)->pos) ? \ + (Dtt)->array[--((Dtt)->pos)] : NULL) + +#define TOP_NODE(Dtt) \ + ((Dtt->pos) ? \ + (Dtt)->array[(Dtt)->pos - 1] : NULL) + +#define EMPTY_NODE(Dtt) (TOP_NODE(Dtt) == NULL) + +static ERTS_INLINE void free_term(DbTable *tb, TreeDbTerm* p) +{ + db_free_term(tb, p, offsetof(TreeDbTerm, dbterm)); +} + +/* +** Some macros for "direction stacks" +*/ +#define DIR_LEFT 0 +#define DIR_RIGHT 1 +#define DIR_END 2 + +static ERTS_INLINE Sint cmp_key(DbTableCommon* tb, Eterm key, TreeDbTerm* obj) { + return CMP(key, GETKEY(tb,obj->dbterm.tpl)); +} + +int tree_balance_left(TreeDbTerm **this); +int tree_balance_right(TreeDbTerm **this); + +int db_first_tree_common(Process *p, DbTable *tbl, TreeDbTerm *root, + Eterm *ret, DbTableTree *stack_container); +int db_next_tree_common(Process *p, DbTable *tbl, + TreeDbTerm *root, Eterm key, + Eterm *ret, DbTreeStack* stack); +int db_last_tree_common(Process *p, DbTable *tbl, TreeDbTerm *root, + Eterm *ret, DbTableTree *stack_container); +int db_prev_tree_common(Process *p, DbTable *tbl, TreeDbTerm *root, Eterm key, + Eterm *ret, DbTreeStack* stack); +int db_put_tree_common(DbTableCommon *tb, TreeDbTerm **root, Eterm obj, + int key_clash_fail, DbTableTree *stack_container); +int db_get_tree_common(Process *p, DbTableCommon *tb, TreeDbTerm *root, Eterm key, + Eterm *ret, DbTableTree *stack_container); +int db_get_element_tree_common(Process *p, DbTableCommon *tb, TreeDbTerm *root, Eterm key, + int ndex, Eterm *ret, DbTableTree *stack_container); +int db_member_tree_common(DbTableCommon *tb, TreeDbTerm *root, Eterm key, Eterm *ret, + DbTableTree *stack_container); +int db_erase_tree_common(DbTable *tbl, TreeDbTerm **root, Eterm key, Eterm *ret, + DbTreeStack *stack /* NULL if no static stack */); +int db_erase_object_tree_common(DbTable *tbl, TreeDbTerm **root, Eterm object, + Eterm *ret, DbTableTree *stack_container); +int db_slot_tree_common(Process *p, DbTable *tbl, TreeDbTerm *root, + Eterm slot_term, Eterm *ret, + DbTableTree *stack_container); +int db_select_chunk_tree_common(Process *p, DbTableCommon *tb, TreeDbTerm **root, + Eterm tid, Eterm pattern, Sint chunk_size, + int reverse, Eterm *ret, + DbTableTree *stack_container); +int db_select_tree_common(Process *p, DbTableCommon *tb, TreeDbTerm **root, + Eterm tid, Eterm pattern, int reverse, Eterm *ret, + DbTableTree *stack_container); +int db_select_delete_tree_common(Process *p, DbTable *tbl, + TreeDbTerm **root, + Eterm tid, Eterm pattern, + Eterm *ret, + DbTreeStack* stack); +int db_select_continue_tree_common(Process *p, + DbTableCommon *tb, + TreeDbTerm **root, + Eterm continuation, + Eterm *ret, + DbTableTree *stack_container); +int db_select_delete_continue_tree_common(Process *p, + DbTable *tbl, + TreeDbTerm **root, + Eterm continuation, + Eterm *ret, + DbTreeStack* stack); +int db_select_count_tree_common(Process *p, DbTableCommon *tb, TreeDbTerm **root, + Eterm tid, Eterm pattern, Eterm *ret, + DbTableTree *stack_container); +int db_select_count_continue_tree_common(Process *p, + DbTableCommon *tb, + TreeDbTerm **root, + Eterm continuation, + Eterm *ret, + DbTableTree *stack_container); +int db_select_replace_tree_common(Process *p, DbTableCommon *tb, TreeDbTerm **root, + Eterm tid, Eterm pattern, Eterm *ret, + DbTableTree *stack_container); +int db_select_replace_continue_tree_common(Process *p, + DbTableCommon *tb, + TreeDbTerm **root, + Eterm continuation, + Eterm *ret, + DbTableTree *stack_container); +int db_take_tree_common(Process *p, DbTable *tbl, TreeDbTerm **root, + Eterm key, Eterm *ret, + DbTreeStack *stack /* NULL if no static stack */); +void db_print_tree_common(fmtfn_t to, void *to_arg, + int show, TreeDbTerm *root, DbTable *tbl); +void db_foreach_offheap_tree_common(TreeDbTerm *root, + void (*func)(ErlOffHeap *, void *), + void * arg); +int db_lookup_dbterm_tree_common(Process *p, DbTable *tbl, TreeDbTerm **root, + Eterm key, Eterm obj, DbUpdateHandle* handle, + DbTableTree *stack_container); +void db_finalize_dbterm_tree_common(int cret, DbUpdateHandle *handle, + DbTableTree *stack_container); +#endif /* _DB_TREE_UTIL_H */ |