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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