1 /* 2 * call-path.h: Manipulate a tree data structure containing function call paths 3 * Copyright (c) 2014, Intel Corporation. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 */ 15 16 #ifndef __PERF_CALL_PATH_H 17 #define __PERF_CALL_PATH_H 18 19 #include <sys/types.h> 20 21 #include <linux/types.h> 22 #include <linux/rbtree.h> 23 24 /** 25 * struct call_path - node in list of calls leading to a function call. 26 * @parent: call path to the parent function call 27 * @sym: symbol of function called 28 * @ip: only if sym is null, the ip of the function 29 * @db_id: id used for db-export 30 * @in_kernel: whether function is a in the kernel 31 * @rb_node: node in parent's tree of called functions 32 * @children: tree of call paths of functions called 33 * 34 * In combination with the call_return structure, the call_path structure 35 * defines a context-sensitve call-graph. 36 */ 37 struct call_path { 38 struct call_path *parent; 39 struct symbol *sym; 40 u64 ip; 41 u64 db_id; 42 bool in_kernel; 43 struct rb_node rb_node; 44 struct rb_root children; 45 }; 46 47 #define CALL_PATH_BLOCK_SHIFT 8 48 #define CALL_PATH_BLOCK_SIZE (1 << CALL_PATH_BLOCK_SHIFT) 49 #define CALL_PATH_BLOCK_MASK (CALL_PATH_BLOCK_SIZE - 1) 50 51 struct call_path_block { 52 struct call_path cp[CALL_PATH_BLOCK_SIZE]; 53 struct list_head node; 54 }; 55 56 /** 57 * struct call_path_root - root of all call paths. 58 * @call_path: root call path 59 * @blocks: list of blocks to store call paths 60 * @next: next free space 61 * @sz: number of spaces 62 */ 63 struct call_path_root { 64 struct call_path call_path; 65 struct list_head blocks; 66 size_t next; 67 size_t sz; 68 }; 69 70 struct call_path_root *call_path_root__new(void); 71 void call_path_root__free(struct call_path_root *cpr); 72 73 struct call_path *call_path__findnew(struct call_path_root *cpr, 74 struct call_path *parent, 75 struct symbol *sym, u64 ip, u64 ks); 76 77 #endif 78