1 /* 2 * Copyright © 2019 Broadcom 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 */ 23 24 #ifndef DAG_H 25 #define DAG_H 26 27 #include <stdint.h> 28 #include "util/list.h" 29 #include "util/u_dynarray.h" 30 31 #ifdef __cplusplus 32 extern "C" { 33 #endif 34 35 struct dag_edge { 36 struct dag_node *child; 37 /* User-defined data associated with the edge. */ 38 void *data; 39 }; 40 41 struct dag_node { 42 /* Position in the DAG heads list (or a self-link) */ 43 struct list_head link; 44 /* Array struct edge to the children. */ 45 struct util_dynarray edges; 46 uint32_t parent_count; 47 }; 48 49 struct dag { 50 struct list_head heads; 51 }; 52 53 struct dag *dag_create(void *mem_ctx); 54 void dag_init_node(struct dag *dag, struct dag_node *node); 55 void dag_add_edge(struct dag_node *parent, struct dag_node *child, void *data); 56 void dag_remove_edge(struct dag *dag, struct dag_edge *edge); 57 void dag_traverse_bottom_up(struct dag *dag, void (*cb)(struct dag_node *node, 58 void *data), void *data); 59 void dag_prune_head(struct dag *dag, struct dag_node *node); 60 61 #ifdef __cplusplus 62 } 63 #endif 64 65 #endif 66