Archipelago » qemu

#!/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')

    sys.exit(1)

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:

            continue

        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 = fobj.read(trace_len)

    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:

            break

        yield rec

class Formatter(object):

    def __init__(self, events):

        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 = self.events[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)