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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Generate .stp file (DTrace with SystemTAP only).
"""
__author__ = "Lluís Vilanova <vilanova@ac.upc.edu>"
__copyright__ = "Copyright 2012-2014, 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
from tracetool.backend.dtrace import binary, probeprefix
# 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_escape(identifier):
# Append underscore to reserved keywords
if identifier in RESERVED_WORDS:
return identifier + '_'
return identifier
def generate(events, backend):
events = [e for e in events
if "disable" not in e.properties]
out('/* This file is autogenerated by tracetool, do not edit. */',
'')
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():
name = stap_escape(name)
out(' %s = $arg%d;' % (name, i))
i += 1
out('}')
out()
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