| Chris Phlipot | 451db12 | 2016-04-28 01:19:07 -0700 | [diff] [blame] | 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 |