tools/perf/util/call-path.h

   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