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Annotation of qemu/scripts/simpletrace.py, revision 1.1

1.1     ! root        1: #!/usr/bin/env python
        !             2: #
        !             3: # Pretty-printer for simple trace backend binary trace files
        !             4: #
        !             5: # Copyright IBM, Corp. 2010
        !             6: #
        !             7: # This work is licensed under the terms of the GNU GPL, version 2.  See
        !             8: # the COPYING file in the top-level directory.
        !             9: #
        !            10: # For help see docs/tracing.txt
        !            11: 
        !            12: import sys
        !            13: import struct
        !            14: import re
        !            15: 
        !            16: header_event_id = 0xffffffffffffffff
        !            17: header_magic    = 0xf2b177cb0aa429b4
        !            18: header_version  = 0
        !            19: 
        !            20: trace_fmt = '=QQQQQQQQ'
        !            21: trace_len = struct.calcsize(trace_fmt)
        !            22: event_re  = re.compile(r'(disable\s+)?([a-zA-Z0-9_]+)\(([^)]*)\).*')
        !            23: 
        !            24: def err(msg):
        !            25:     sys.stderr.write(msg + '\n')
        !            26:     sys.exit(1)
        !            27: 
        !            28: def parse_events(fobj):
        !            29:     """Parse a trace-events file."""
        !            30: 
        !            31:     def get_argnames(args):
        !            32:         """Extract argument names from a parameter list."""
        !            33:         return tuple(arg.split()[-1].lstrip('*') for arg in args.split(','))
        !            34: 
        !            35:     events = {}
        !            36:     event_num = 0
        !            37:     for line in fobj:
        !            38:         m = event_re.match(line.strip())
        !            39:         if m is None:
        !            40:             continue
        !            41: 
        !            42:         disable, name, args = m.groups()
        !            43:         events[event_num] = (name,) + get_argnames(args)
        !            44:         event_num += 1
        !            45:     return events
        !            46: 
        !            47: def read_record(fobj):
        !            48:     """Deserialize a trace record from a file."""
        !            49:     s = fobj.read(trace_len)
        !            50:     if len(s) != trace_len:
        !            51:         return None
        !            52:     return struct.unpack(trace_fmt, s)
        !            53: 
        !            54: def read_trace_file(fobj):
        !            55:     """Deserialize trace records from a file."""
        !            56:     header = read_record(fobj)
        !            57:     if header is None or \
        !            58:        header[0] != header_event_id or \
        !            59:        header[1] != header_magic or \
        !            60:        header[2] != header_version:
        !            61:         err('not a trace file or incompatible version')
        !            62: 
        !            63:     while True:
        !            64:         rec = read_record(fobj)
        !            65:         if rec is None:
        !            66:             break
        !            67: 
        !            68:         yield rec
        !            69: 
        !            70: class Formatter(object):
        !            71:     def __init__(self, events):
        !            72:         self.events = events
        !            73:         self.last_timestamp = None
        !            74: 
        !            75:     def format_record(self, rec):
        !            76:         if self.last_timestamp is None:
        !            77:             self.last_timestamp = rec[1]
        !            78:         delta_ns = rec[1] - self.last_timestamp
        !            79:         self.last_timestamp = rec[1]
        !            80: 
        !            81:         event = self.events[rec[0]]
        !            82:         fields = [event[0], '%0.3f' % (delta_ns / 1000.0)]
        !            83:         for i in xrange(1, len(event)):
        !            84:             fields.append('%s=0x%x' % (event[i], rec[i + 1]))
        !            85:         return ' '.join(fields)
        !            86: 
        !            87: if len(sys.argv) != 3:
        !            88:     err('usage: %s <trace-events> <trace-file>' % sys.argv[0])
        !            89: 
        !            90: events = parse_events(open(sys.argv[1], 'r'))
        !            91: formatter = Formatter(events)
        !            92: for rec in read_trace_file(open(sys.argv[2], 'rb')):
        !            93:     print formatter.format_record(rec)

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