Linux Kernel  3.7.1
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probe-finder.h
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1 #ifndef _PROBE_FINDER_H
2 #define _PROBE_FINDER_H
3 
4 #include <stdbool.h>
5 #include "util.h"
6 #include "probe-event.h"
7 
8 #define MAX_PROBE_BUFFER 1024
9 #define MAX_PROBES 128
10 
11 static inline int is_c_varname(const char *name)
12 {
13  /* TODO */
14  return isalpha(name[0]) || name[0] == '_';
15 }
16 
17 #ifdef DWARF_SUPPORT
18 
19 #include "dwarf-aux.h"
20 
21 /* TODO: export debuginfo data structure even if no dwarf support */
22 
23 /* debug information structure */
24 struct debuginfo {
25  Dwarf *dbg;
26  Dwfl *dwfl;
27  Dwarf_Addr bias;
28 };
29 
30 extern struct debuginfo *debuginfo__new(const char *path);
31 extern struct debuginfo *debuginfo__new_online_kernel(unsigned long addr);
32 extern void debuginfo__delete(struct debuginfo *self);
33 
34 /* Find probe_trace_events specified by perf_probe_event from debuginfo */
35 extern int debuginfo__find_trace_events(struct debuginfo *self,
36  struct perf_probe_event *pev,
37  struct probe_trace_event **tevs,
38  int max_tevs);
39 
40 /* Find a perf_probe_point from debuginfo */
41 extern int debuginfo__find_probe_point(struct debuginfo *self,
42  unsigned long addr,
43  struct perf_probe_point *ppt);
44 
45 /* Find a line range */
46 extern int debuginfo__find_line_range(struct debuginfo *self,
47  struct line_range *lr);
48 
49 /* Find available variables */
50 extern int debuginfo__find_available_vars_at(struct debuginfo *self,
51  struct perf_probe_event *pev,
52  struct variable_list **vls,
53  int max_points, bool externs);
54 
55 struct probe_finder {
56  struct perf_probe_event *pev; /* Target probe event */
57 
58  /* Callback when a probe point is found */
59  int (*callback)(Dwarf_Die *sc_die, struct probe_finder *pf);
60 
61  /* For function searching */
62  int lno; /* Line number */
63  Dwarf_Addr addr; /* Address */
64  const char *fname; /* Real file name */
65  Dwarf_Die cu_die; /* Current CU */
66  Dwarf_Die sp_die;
67  struct list_head lcache; /* Line cache for lazy match */
68 
69  /* For variable searching */
70 #if _ELFUTILS_PREREQ(0, 142)
71  Dwarf_CFI *cfi; /* Call Frame Information */
72 #endif
73  Dwarf_Op *fb_ops; /* Frame base attribute */
74  struct perf_probe_arg *pvar; /* Current target variable */
75  struct probe_trace_arg *tvar; /* Current result variable */
76 };
77 
78 struct trace_event_finder {
79  struct probe_finder pf;
80  struct probe_trace_event *tevs; /* Found trace events */
81  int ntevs; /* Number of trace events */
82  int max_tevs; /* Max number of trace events */
83 };
84 
85 struct available_var_finder {
86  struct probe_finder pf;
87  struct variable_list *vls; /* Found variable lists */
88  int nvls; /* Number of variable lists */
89  int max_vls; /* Max no. of variable lists */
90  bool externs; /* Find external vars too */
91  bool child; /* Search child scopes */
92 };
93 
94 struct line_finder {
95  struct line_range *lr; /* Target line range */
96 
97  const char *fname; /* File name */
98  int lno_s; /* Start line number */
99  int lno_e; /* End line number */
100  Dwarf_Die cu_die; /* Current CU */
101  Dwarf_Die sp_die;
102  int found;
103 };
104 
105 #endif /* DWARF_SUPPORT */
106 
107 #endif /*_PROBE_FINDER_H */