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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
DTrace/SystemTAP backend.
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
__copyright__ = "Copyright 2012, Lluís Vilanova <vilanova@ac.upc.edu>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
__email__ = "stefanha@linux.vnet.ibm.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 c(events):
pass
def h(events):
out('#include "trace/generated-tracers-dtrace.h"',
'')
for e in events:
out('static inline void trace_%(name)s(%(args)s) {',
' QEMU_%(uppername)s(%(argnames)s);',
'}',
name = e.name,
args = e.args,
uppername = e.name.upper(),
argnames = ", ".join(e.args.names()),
)
def d(events):
out('provider qemu {')
for e in events:
args = str(e.args)
# DTrace provider syntax expects foo() for empty
# params, not foo(void)
if args == 'void':
args = ''
# Define prototype for probe arguments
out('',
'probe %(name)s(%(args)s);',
name = e.name,
args = args,
)
out('',
'};')
# Technically 'self' is not used by systemtap yet, but
# they recommended we keep it in the reserved list anyway
RESERVED_WORDS = (
'break', 'catch', 'continue', 'delete', 'else', 'for',
'foreach', 'function', 'global', 'if', 'in', 'limit',
'long', 'next', 'probe', 'return', 'self', 'string',
'try', 'while'
)
def stap(events):
for e in events:
# Define prototype for probe arguments
out('probe %(probeprefix)s.%(name)s = process("%(binary)s").mark("%(name)s")',
'{',
probeprefix = _probeprefix(),
name = e.name,
binary = _binary(),
)
i = 1
if len(e.args) > 0:
for name in e.args.names():
# Append underscore to reserved keywords
if name in RESERVED_WORDS:
name += '_'
out(' %s = $arg%d;' % (name, i))
i += 1
out('}')
out()
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