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_PROBE_BUFFER        1024
   9 #define MAX_PROBES               128
  10 #define MAX_PROBE_ARGS           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 HAVE_DWARF_SUPPORT
  19
  20 #include "dwarf-aux.h"
  21
  22 /* TODO: export debuginfo data structure even if no dwarf support */
  23
  24 /* debug information structure */
  25 struct debuginfo {
  26         Dwarf           *dbg;
  27         Dwfl_Module     *mod;
  28         Dwfl            *dwfl;
  29         Dwarf_Addr      bias;
  30 };
  31
  32 extern struct debuginfo *debuginfo__new(const char *path);
  33 extern struct debuginfo *debuginfo__new_online_kernel(unsigned long addr);
  34 extern void debuginfo__delete(struct debuginfo *dbg);
  35
  36 /* Find probe_trace_events specified by perf_probe_event from debuginfo */
  37 extern int debuginfo__find_trace_events(struct debuginfo *dbg,
  38                                         struct perf_probe_event *pev,
  39                                         struct probe_trace_event **tevs,
  40                                         int max_tevs);
  41
  42 /* Find a perf_probe_point from debuginfo */
  43 extern int debuginfo__find_probe_point(struct debuginfo *dbg,
  44                                        unsigned long addr,
  45                                        struct perf_probe_point *ppt);
  46
  47 /* Find a line range */
  48 extern int debuginfo__find_line_range(struct debuginfo *dbg,
  49                                       struct line_range *lr);
  50
  51 /* Find available variables */
  52 extern int debuginfo__find_available_vars_at(struct debuginfo *dbg,
  53                                              struct perf_probe_event *pev,
  54                                              struct variable_list **vls,
  55                                              int max_points, bool externs);
  56
  57 struct probe_finder {
  58         struct perf_probe_event *pev;           /* Target probe event */
  59
  60         /* Callback when a probe point is found */
  61         int (*callback)(Dwarf_Die *sc_die, struct probe_finder *pf);
  62
  63         /* For function searching */
  64         int                     lno;            /* Line number */
  65         Dwarf_Addr              addr;           /* Address */
  66         const char              *fname;         /* Real file name */
  67         Dwarf_Die               cu_die;         /* Current CU */
  68         Dwarf_Die               sp_die;
  69         struct list_head        lcache;         /* Line cache for lazy match */
  70
  71         /* For variable searching */
  72 #if _ELFUTILS_PREREQ(0, 142)
  73         Dwarf_CFI               *cfi;           /* Call Frame Information */
  74 #endif
  75         Dwarf_Op                *fb_ops;        /* Frame base attribute */
  76         struct perf_probe_arg   *pvar;          /* Current target variable */
  77         struct probe_trace_arg  *tvar;          /* Current result variable */
  78 };
  79
  80 struct trace_event_finder {
  81         struct probe_finder     pf;
  82         Dwfl_Module             *mod;           /* For solving symbols */
  83         struct probe_trace_event *tevs;         /* Found trace events */
  84         int                     ntevs;          /* Number of trace events */
  85         int                     max_tevs;       /* Max number of trace events */
  86 };
  87
  88 struct available_var_finder {
  89         struct probe_finder     pf;
  90         Dwfl_Module             *mod;           /* For solving symbols */
  91         struct variable_list    *vls;           /* Found variable lists */
  92         int                     nvls;           /* Number of variable lists */
  93         int                     max_vls;        /* Max no. of variable lists */
  94         bool                    externs;        /* Find external vars too */
  95         bool                    child;          /* Search child scopes */
  96 };
  97
  98 struct line_finder {
  99         struct line_range       *lr;            /* Target line range */
 100
 101         const char              *fname;         /* File name */
 102         int                     lno_s;          /* Start line number */
 103         int                     lno_e;          /* End line number */
 104         Dwarf_Die               cu_die;         /* Current CU */
 105         Dwarf_Die               sp_die;
 106         int                     found;
 107 };
 108
 109 #endif /* HAVE_DWARF_SUPPORT */
 110
 111 #endif /*_PROBE_FINDER_H */