scripts/tracetool/backend/ust.py

   1 # -*- coding: utf-8 -*-
   2
   3 """
   4 LTTng User Space Tracing backend.
   5 """
   6
   7 __author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
   8 __copyright__  = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
   9 __license__    = "GPL version 2 or (at your option) any later version"
  10
  11 __maintainer__ = "Stefan Hajnoczi"
  12 __email__      = "stefanha@redhat.com"
  13
  14
  15 from tracetool import out
  16
  17
  18 PUBLIC = True
  19
  20
  21 def generate_h_begin(events, group):
  22     if group == "root":
  23         header = "trace-ust-root.h"
  24     else:
  25         header = "trace-ust.h"
  26
  27     out('#include <lttng/tracepoint.h>',
  28         '#include "%s"' % header,
  29         '',
  30         '/* tracepoint_enabled() was introduced in LTTng UST 2.7 */',
  31         '#ifndef tracepoint_enabled',
  32         '#define tracepoint_enabled(a, b) true',
  33         '#endif',
  34         '')
  35
  36
  37 def generate_h(event, group):
  38     argnames = ", ".join(event.args.names())
  39     if len(event.args) > 0:
  40         argnames = ", " + argnames
  41
  42     out('    tracepoint(qemu, %(name)s%(tp_args)s);',
  43         name=event.name,
  44         tp_args=argnames)
  45
  46
  47 def generate_h_backend_dstate(event, group):
  48     out('    tracepoint_enabled(qemu, %(name)s) || \\',
  49         name=event.name)