scripts/tracetool/backend/ust.py

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