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#!/usr/bin/env python
# Pretty-printer for simple trace backend binary trace files
# Copyright IBM, Corp. 2010
# This work is licensed under the terms of the GNU GPL, version 2. See
# the COPYING file in the top-level directory.
# For help see docs/tracing.txt
import sys
import struct
import re
header_event_id = 0xffffffffffffffff
header_magic = 0xf2b177cb0aa429b4
header_version = 0
trace_fmt = '=QQQQQQQQ'
trace_len = struct.calcsize(trace_fmt)
event_re = re.compile(r'(disable\s+)?([a-zA-Z0-9_]+)\(([^)]*)\).*')
def err(msg):
sys.stderr.write(msg + '\n')
def parse_events(fobj):
"""Parse a trace-events file."""
def get_argnames(args):
"""Extract argument names from a parameter list."""
return tuple(arg.split()[-1].lstrip('*') for arg in args.split(','))
events = {}
event_num = 0
for line in fobj:
m = event_re.match(line.strip())
if m is None:
disable, name, args = m.groups()
events[event_num] = (name,) + get_argnames(args)
event_num += 1
return events
def read_record(fobj):
"""Deserialize a trace record from a file."""
s =
if len(s) != trace_len:
return None
return struct.unpack(trace_fmt, s)
def read_trace_file(fobj):
"""Deserialize trace records from a file."""
header = read_record(fobj)
if header is None or \
header[0] != header_event_id or \
header[1] != header_magic or \
header[2] != header_version:
err('not a trace file or incompatible version')
while True:
rec = read_record(fobj)
if rec is None:
yield rec
class Formatter(object):
def __init__(self, events): = events
self.last_timestamp = None
def format_record(self, rec):
if self.last_timestamp is None:
self.last_timestamp = rec[1]
delta_ns = rec[1] - self.last_timestamp
self.last_timestamp = rec[1]
event =[rec[0]]
fields = [event[0], '%0.3f' % (delta_ns / 1000.0)]
for i in xrange(1, len(event)):
fields.append('%s=0x%x' % (event[i], rec[i + 1]))
return ' '.join(fields)
if len(sys.argv) != 3:
err('usage: %s <trace-events> <trace-file>' % sys.argv[0])
events = parse_events(open(sys.argv[1], 'r'))
formatter = Formatter(events)
for rec in read_trace_file(open(sys.argv[2], 'rb')):
print formatter.format_record(rec)
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