scripts/tracetool/backend/dtrace.py

   1 # -*- coding: utf-8 -*-
   2
   3 """
   4 DTrace/SystemTAP 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 PROBEPREFIX = None
  22
  23 def probeprefix():
  24     if PROBEPREFIX is None:
  25         raise ValueError("you must set PROBEPREFIX")
  26     return PROBEPREFIX
  27
  28
  29 BINARY = None
  30
  31 def binary():
  32     if BINARY is None:
  33         raise ValueError("you must set BINARY")
  34     return BINARY
  35
  36
  37 def generate_h_begin(events, group):
  38     if group == "root":
  39         header = "trace-dtrace-root.h"
  40     else:
  41         header = "trace-dtrace-%s.h" % group
  42
  43     # Workaround for ust backend, which also includes <sys/sdt.h> and may
  44     # require SDT_USE_VARIADIC to be defined. If dtrace includes <sys/sdt.h>
  45     # first without defining SDT_USE_VARIADIC then ust breaks because the
  46     # STAP_PROBEV() macro is not defined.
  47     out('#ifndef SDT_USE_VARIADIC')
  48     out('#define SDT_USE_VARIADIC 1')
  49     out('#endif')
  50
  51     out('#include "%s"' % header,
  52         '')
  53
  54     out('#undef SDT_USE_VARIADIC')
  55
  56     # SystemTap defines <provider>_<name>_ENABLED() but other DTrace
  57     # implementations might not.
  58     for e in events:
  59         out('#ifndef QEMU_%(uppername)s_ENABLED',
  60             '#define QEMU_%(uppername)s_ENABLED() true',
  61             '#endif',
  62             uppername=e.name.upper())
  63
  64 def generate_h(event, group):
  65     out('    QEMU_%(uppername)s(%(argnames)s);',
  66         uppername=event.name.upper(),
  67         argnames=", ".join(event.args.names()))
  68
  69
  70 def generate_h_backend_dstate(event, group):
  71     out('    QEMU_%(uppername)s_ENABLED() || \\',
  72         uppername=event.name.upper())