tools/perf/util/probe-finder.h

   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_PATH_LEN             256
   9 #define MAX_PROBE_BUFFER        1024
  10 #define MAX_PROBES               128
  11
  12 static inline int is_c_varname(const char *name)
  13 {
  14         /* TODO */
  15         return isalpha(name[0]) || name[0] == '_';
  16 }
  17
  18 #ifdef DWARF_SUPPORT
  19 /* Find probe_trace_events specified by perf_probe_event from debuginfo */
  20 extern int find_probe_trace_events(int fd, struct perf_probe_event *pev,
  21                                     struct probe_trace_event **tevs,
  22                                     int max_tevs);
  23
  24 /* Find a perf_probe_point from debuginfo */
  25 extern int find_perf_probe_point(unsigned long addr,
  26                                  struct perf_probe_point *ppt);
  27
  28 /* Find a line range */
  29 extern int find_line_range(int fd, struct line_range *lr);
  30
  31 /* Find available variables */
  32 extern int find_available_vars_at(int fd, struct perf_probe_event *pev,
  33                                   struct variable_list **vls, int max_points,
  34                                   bool externs);
  35
  36 #include <dwarf.h>
  37 #include <elfutils/libdw.h>
  38 #include <elfutils/libdwfl.h>
  39 #include <elfutils/version.h>
  40
  41 struct probe_finder {
  42         struct perf_probe_event *pev;           /* Target probe event */
  43
  44         /* Callback when a probe point is found */
  45         int (*callback)(Dwarf_Die *sp_die, struct probe_finder *pf);
  46
  47         /* For function searching */
  48         int                     lno;            /* Line number */
  49         Dwarf_Addr              addr;           /* Address */
  50         const char              *fname;         /* Real file name */
  51         Dwarf_Die               cu_die;         /* Current CU */
  52         Dwarf_Die               sp_die;
  53         struct list_head        lcache;         /* Line cache for lazy match */
  54
  55         /* For variable searching */
  56 #if _ELFUTILS_PREREQ(0, 142)
  57         Dwarf_CFI               *cfi;           /* Call Frame Information */
  58 #endif
  59         Dwarf_Op                *fb_ops;        /* Frame base attribute */
  60         struct perf_probe_arg   *pvar;          /* Current target variable */
  61         struct probe_trace_arg  *tvar;          /* Current result variable */
  62 };
  63
  64 struct trace_event_finder {
  65         struct probe_finder     pf;
  66         struct probe_trace_event *tevs;         /* Found trace events */
  67         int                     ntevs;          /* Number of trace events */
  68         int                     max_tevs;       /* Max number of trace events */
  69 };
  70
  71 struct available_var_finder {
  72         struct probe_finder     pf;
  73         struct variable_list    *vls;           /* Found variable lists */
  74         int                     nvls;           /* Number of variable lists */
  75         int                     max_vls;        /* Max no. of variable lists */
  76         bool                    externs;        /* Find external vars too */
  77         bool                    child;          /* Search child scopes */
  78 };
  79
  80 struct line_finder {
  81         struct line_range       *lr;            /* Target line range */
  82
  83         const char              *fname;         /* File name */
  84         int                     lno_s;          /* Start line number */
  85         int                     lno_e;          /* End line number */
  86         Dwarf_Die               cu_die;         /* Current CU */
  87         Dwarf_Die               sp_die;
  88         int                     found;
  89 };
  90
  91 #endif /* DWARF_SUPPORT */
  92
  93 #endif /*_PROBE_FINDER_H */