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     header = 'trace-ust-' + group + '.h'
  23     out('#include <lttng/tracepoint.h>',
  24         '#include "%s"' % header,
  25         '',
  26         '/* tracepoint_enabled() was introduced in LTTng UST 2.7 */',
  27         '#ifndef tracepoint_enabled',
  28         '#define tracepoint_enabled(a, b) true',
  29         '#endif',
  30         '')
  31
  32
  33 def generate_h(event, group):
  34     argnames = ", ".join(event.args.names())
  35     if len(event.args) > 0:
  36         argnames = ", " + argnames
  37
  38     out('    tracepoint(qemu, %(name)s%(tp_args)s);',
  39         name=event.name,
  40         tp_args=argnames)
  41
  42
  43 def generate_h_backend_dstate(event, group):
  44     out('    tracepoint_enabled(qemu, %(name)s) || \\',
  45         name=event.name)