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# -*- coding: utf-8 -*-
"""
DTrace/SystemTAP backend.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
__copyright__ = "Copyright 2012-2017, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
__email__ = "stefanha@redhat.com"
from tracetool import out
PUBLIC = True
PROBEPREFIX = None
def probeprefix():
if PROBEPREFIX is None:
raise ValueError("you must set PROBEPREFIX")
return PROBEPREFIX
BINARY = None
def binary():
if BINARY is None:
raise ValueError("you must set BINARY")
return BINARY
def generate_h_begin(events, group):
if group == "root":
header = "trace-dtrace-root.h"
else:
header = "trace-dtrace-%s.h" % group
# Workaround for ust backend, which also includes <sys/sdt.h> and may
# require SDT_USE_VARIADIC to be defined. If dtrace includes <sys/sdt.h>
# first without defining SDT_USE_VARIADIC then ust breaks because the
# STAP_PROBEV() macro is not defined.
out('#ifndef SDT_USE_VARIADIC')
out('#define SDT_USE_VARIADIC 1')
out('#endif')
out('#include "%s"' % header,
'')
out('#undef SDT_USE_VARIADIC')
# SystemTap defines <provider>_<name>_ENABLED() but other DTrace
# implementations might not.
for e in events:
out('#ifndef QEMU_%(uppername)s_ENABLED',
'#define QEMU_%(uppername)s_ENABLED() true',
'#endif',
uppername=e.name.upper())
def generate_h(event, group):
out(' QEMU_%(uppername)s(%(argnames)s);',
uppername=event.name.upper(),
argnames=", ".join(event.args.names()))
def generate_h_backend_dstate(event, group):
out(' QEMU_%(uppername)s_ENABLED() || \\',
uppername=event.name.upper())
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