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Annotation of qemu/scripts/simpletrace.py, revision 1.1.1.1

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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