1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * call-path.h: Manipulate a tree data structure containing function call paths 4 * Copyright (c) 2014, Intel Corporation. 5 */ 6 7 #ifndef __PERF_CALL_PATH_H 8 #define __PERF_CALL_PATH_H 9 10 #include <sys/types.h> 11 12 #include <linux/types.h> 13 #include <linux/rbtree.h> 14 15 /** 16 * struct call_path - node in list of calls leading to a function call. 17 * @parent: call path to the parent function call 18 * @sym: symbol of function called 19 * @ip: only if sym is null, the ip of the function 20 * @db_id: id used for db-export 21 * @in_kernel: whether function is a in the kernel 22 * @rb_node: node in parent's tree of called functions 23 * @children: tree of call paths of functions called 24 * 25 * In combination with the call_return structure, the call_path structure 26 * defines a context-sensitve call-graph. 27 */ 28 struct call_path { 29 struct call_path *parent; 30 struct symbol *sym; 31 u64 ip; 32 u64 db_id; 33 bool in_kernel; 34 struct rb_node rb_node; 35 struct rb_root children; 36 }; 37 38 #define CALL_PATH_BLOCK_SHIFT 8 39 #define CALL_PATH_BLOCK_SIZE (1 << CALL_PATH_BLOCK_SHIFT) 40 #define CALL_PATH_BLOCK_MASK (CALL_PATH_BLOCK_SIZE - 1) 41 42 struct call_path_block { 43 struct call_path cp[CALL_PATH_BLOCK_SIZE]; 44 struct list_head node; 45 }; 46 47 /** 48 * struct call_path_root - root of all call paths. 49 * @call_path: root call path 50 * @blocks: list of blocks to store call paths 51 * @next: next free space 52 * @sz: number of spaces 53 */ 54 struct call_path_root { 55 struct call_path call_path; 56 struct list_head blocks; 57 size_t next; 58 size_t sz; 59 }; 60 61 struct call_path_root *call_path_root__new(void); 62 void call_path_root__free(struct call_path_root *cpr); 63 64 struct call_path *call_path__findnew(struct call_path_root *cpr, 65 struct call_path *parent, 66 struct symbol *sym, u64 ip, u64 ks); 67 68 #endif 69