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-sensitive 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