94 lines
2.5 KiB
Python
94 lines
2.5 KiB
Python
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"""Statistics analyzer for HotShot."""
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import profile
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import pstats
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import hotshot.log
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from hotshot.log import ENTER, EXIT
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def load(filename):
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return StatsLoader(filename).load()
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class StatsLoader:
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def __init__(self, logfn):
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self._logfn = logfn
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self._code = {}
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self._stack = []
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self.pop_frame = self._stack.pop
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def load(self):
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# The timer selected by the profiler should never be used, so make
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# sure it doesn't work:
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p = Profile()
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p.get_time = _brokentimer
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log = hotshot.log.LogReader(self._logfn)
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taccum = 0
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for event in log:
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what, (filename, lineno, funcname), tdelta = event
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if tdelta > 0:
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taccum += tdelta
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# We multiply taccum to convert from the microseconds we
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# have to the seconds that the profile/pstats module work
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# with; this allows the numbers to have some basis in
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# reality (ignoring calibration issues for now).
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if what == ENTER:
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frame = self.new_frame(filename, lineno, funcname)
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p.trace_dispatch_call(frame, taccum * .000001)
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taccum = 0
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elif what == EXIT:
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frame = self.pop_frame()
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p.trace_dispatch_return(frame, taccum * .000001)
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taccum = 0
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# no further work for line events
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assert not self._stack
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return pstats.Stats(p)
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def new_frame(self, *args):
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# args must be filename, firstlineno, funcname
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# our code objects are cached since we don't need to create
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# new ones every time
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try:
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code = self._code[args]
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except KeyError:
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code = FakeCode(*args)
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self._code[args] = code
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# frame objects are create fresh, since the back pointer will
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# vary considerably
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if self._stack:
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back = self._stack[-1]
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else:
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back = None
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frame = FakeFrame(code, back)
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self._stack.append(frame)
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return frame
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class Profile(profile.Profile):
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def simulate_cmd_complete(self):
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pass
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class FakeCode:
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def __init__(self, filename, firstlineno, funcname):
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self.co_filename = filename
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self.co_firstlineno = firstlineno
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self.co_name = self.__name__ = funcname
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class FakeFrame:
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def __init__(self, code, back):
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self.f_back = back
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self.f_code = code
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def _brokentimer():
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raise RuntimeError, "this timer should not be called"
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