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 12import struct 13import re 14import inspect 15from tracetool import _read_events, Event 16from tracetool.backend.simple import is_string 17 18header_event_id = 0xffffffffffffffff 19header_magic = 0xf2b177cb0aa429b4 20dropped_event_id = 0xfffffffffffffffe 21 22log_header_fmt = '=QQQ' 23rec_header_fmt = '=QQII' 24 25def read_header(fobj, hfmt): 26 '''Read a trace record header''' 27 hlen = struct.calcsize(hfmt) 28 hdr = fobj.read(hlen) 29 if len(hdr) != hlen: 30 return None 31 return struct.unpack(hfmt, hdr) 32 33def get_record(edict, rechdr, fobj): 34 """Deserialize a trace record from a file into a tuple (event_num, timestamp, pid, arg1, ..., arg6).""" 35 if rechdr is None: 36 return None 37 rec = (rechdr[0], rechdr[1], rechdr[3]) 38 if rechdr[0] != dropped_event_id: 39 event_id = rechdr[0] 40 event = edict[event_id] 41 for type, name in event.args: 42 if is_string(type): 43 l = fobj.read(4) 44 (len,) = struct.unpack('=L', l) 45 s = fobj.read(len) 46 rec = rec + (s,) 47 else: 48 (value,) = struct.unpack('=Q', fobj.read(8)) 49 rec = rec + (value,) 50 else: 51 (value,) = struct.unpack('=Q', fobj.read(8)) 52 rec = rec + (value,) 53 return rec 54 55 56def read_record(edict, fobj): 57 """Deserialize a trace record from a file into a tuple (event_num, timestamp, pid, arg1, ..., arg6).""" 58 rechdr = read_header(fobj, rec_header_fmt) 59 return get_record(edict, rechdr, fobj) # return tuple of record elements 60 61def read_trace_file(edict, fobj): 62 """Deserialize trace records from a file, yielding record tuples (event_num, timestamp, pid, arg1, ..., arg6).""" 63 header = read_header(fobj, log_header_fmt) 64 if header is None or \ 65 header[0] != header_event_id or \ 66 header[1] != header_magic: 67 raise ValueError('Not a valid trace file!') 68 69 log_version = header[2] 70 if log_version not in [0, 2, 3]: 71 raise ValueError('Unknown version of tracelog format!') 72 if log_version != 3: 73 raise ValueError('Log format %d not supported with this QEMU release!' 74 % log_version) 75 76 while True: 77 rec = read_record(edict, fobj) 78 if rec is None: 79 break 80 81 yield rec 82 83class Analyzer(object): 84 """A trace file analyzer which processes trace records. 85 86 An analyzer can be passed to run() or process(). The begin() method is 87 invoked, then each trace record is processed, and finally the end() method 88 is invoked. 89 90 If a method matching a trace event name exists, it is invoked to process 91 that trace record. Otherwise the catchall() method is invoked.""" 92 93 def begin(self): 94 """Called at the start of the trace.""" 95 pass 96 97 def catchall(self, event, rec): 98 """Called if no specific method for processing a trace event has been found.""" 99 pass 100 101 def end(self): 102 """Called at the end of the trace.""" 103 pass 104 105def process(events, log, analyzer): 106 """Invoke an analyzer on each event in a log.""" 107 if isinstance(events, str): 108 events = _read_events(open(events, 'r')) 109 if isinstance(log, str): 110 log = open(log, 'rb') 111 112 dropped_event = Event.build("Dropped_Event(uint64_t num_events_dropped)") 113 edict = {dropped_event_id: dropped_event} 114 115 for num, event in enumerate(events): 116 edict[num] = event 117 118 def build_fn(analyzer, event): 119 if isinstance(event, str): 120 return analyzer.catchall 121 122 fn = getattr(analyzer, event.name, None) 123 if fn is None: 124 return analyzer.catchall 125 126 event_argcount = len(event.args) 127 fn_argcount = len(inspect.getargspec(fn)[0]) - 1 128 if fn_argcount == event_argcount + 1: 129 # Include timestamp as first argument 130 return lambda _, rec: fn(*((rec[1:2],) + rec[3:3 + event_argcount])) 131 elif fn_argcount == event_argcount + 2: 132 # Include timestamp and pid 133 return lambda _, rec: fn(*rec[1:3 + event_argcount]) 134 else: 135 # Just arguments, no timestamp or pid 136 return lambda _, rec: fn(*rec[3:3 + event_argcount]) 137 138 analyzer.begin() 139 fn_cache = {} 140 for rec in read_trace_file(edict, log): 141 event_num = rec[0] 142 event = edict[event_num] 143 if event_num not in fn_cache: 144 fn_cache[event_num] = build_fn(analyzer, event) 145 fn_cache[event_num](event, rec) 146 analyzer.end() 147 148def run(analyzer): 149 """Execute an analyzer on a trace file given on the command-line. 150 151 This function is useful as a driver for simple analysis scripts. More 152 advanced scripts will want to call process() instead.""" 153 import sys 154 155 if len(sys.argv) != 3: 156 sys.stderr.write('usage: %s <trace-events> <trace-file>\n' % sys.argv[0]) 157 sys.exit(1) 158 159 events = _read_events(open(sys.argv[1], 'r')) 160 process(events, sys.argv[2], analyzer) 161 162if __name__ == '__main__': 163 class Formatter(Analyzer): 164 def __init__(self): 165 self.last_timestamp = None 166 167 def catchall(self, event, rec): 168 timestamp = rec[1] 169 if self.last_timestamp is None: 170 self.last_timestamp = timestamp 171 delta_ns = timestamp - self.last_timestamp 172 self.last_timestamp = timestamp 173 174 fields = [event.name, '%0.3f' % (delta_ns / 1000.0), 175 'pid=%d' % rec[2]] 176 i = 3 177 for type, name in event.args: 178 if is_string(type): 179 fields.append('%s=%s' % (name, rec[i])) 180 else: 181 fields.append('%s=0x%x' % (name, rec[i])) 182 i += 1 183 print ' '.join(fields) 184 185 run(Formatter()) 186