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Text File  |  2002-07-18  |  6KB  |  193 lines
  1. import _hotshot
  2. import os.path
  3. import parser
  4. import symbol
  5. import sys
  6.  
  7. from _hotshot import \
  8.      WHAT_ENTER, \
  9.      WHAT_EXIT, \
  10.      WHAT_LINENO, \
  11.      WHAT_DEFINE_FILE, \
  12.      WHAT_DEFINE_FUNC, \
  13.      WHAT_ADD_INFO
  14.  
  15.  
  16. __all__ = ["LogReader", "ENTER", "EXIT", "LINE"]
  17.  
  18.  
  19. ENTER = WHAT_ENTER
  20. EXIT  = WHAT_EXIT
  21. LINE  = WHAT_LINENO
  22.  
  23.  
  24. class LogReader:
  25.     def __init__(self, logfn):
  26.         # fileno -> filename
  27.         self._filemap = {}
  28.         # (fileno, lineno) -> filename, funcname
  29.         self._funcmap = {}
  30.  
  31.         self._reader = _hotshot.logreader(logfn)
  32.         self._nextitem = self._reader.next
  33.         self._info = self._reader.info
  34.         if self._info.has_key('current-directory'):
  35.             self.cwd = self._info['current-directory']
  36.         else:
  37.             self.cwd = None
  38.  
  39.         # This mirrors the call stack of the profiled code as the log
  40.         # is read back in.  It contains tuples of the form:
  41.         #
  42.         #   (file name, line number of function def, function name)
  43.         #
  44.         self._stack = []
  45.         self._append = self._stack.append
  46.         self._pop = self._stack.pop
  47.  
  48.     def close(self):
  49.         self._reader.close()
  50.  
  51.     def fileno(self):
  52.         """Return the file descriptor of the log reader's log file."""
  53.         return self._reader.fileno()
  54.  
  55.     def addinfo(self, key, value):
  56.         """This method is called for each additional ADD_INFO record.
  57.  
  58.         This can be overridden by applications that want to receive
  59.         these events.  The default implementation does not need to be
  60.         called by alternate implementations.
  61.  
  62.         The initial set of ADD_INFO records do not pass through this
  63.         mechanism; this is only needed to receive notification when
  64.         new values are added.  Subclasses can inspect self._info after
  65.         calling LogReader.__init__().
  66.         """
  67.         pass
  68.  
  69.     def get_filename(self, fileno):
  70.         try:
  71.             return self._filemap[fileno]
  72.         except KeyError:
  73.             raise ValueError, "unknown fileno"
  74.  
  75.     def get_filenames(self):
  76.         return self._filemap.values()
  77.  
  78.     def get_fileno(self, filename):
  79.         filename = os.path.normcase(os.path.normpath(filename))
  80.         for fileno, name in self._filemap.items():
  81.             if name == filename:
  82.                 return fileno
  83.         raise ValueError, "unknown filename"
  84.  
  85.     def get_funcname(self, fileno, lineno):
  86.         try:
  87.             return self._funcmap[(fileno, lineno)]
  88.         except KeyError:
  89.             raise ValueError, "unknown function location"
  90.  
  91.     # Iteration support:
  92.     # This adds an optional (& ignored) parameter to next() so that the
  93.     # same bound method can be used as the __getitem__() method -- this
  94.     # avoids using an additional method call which kills the performance.
  95.  
  96.     def next(self, index=0):
  97.         while 1:
  98.             # This call may raise StopIteration:
  99.             what, tdelta, fileno, lineno = self._nextitem()
  100.  
  101.             # handle the most common cases first
  102.  
  103.             if what == WHAT_ENTER:
  104.                 filename, funcname = self._decode_location(fileno, lineno)
  105.                 t = (filename, lineno, funcname)
  106.                 self._append(t)
  107.                 return what, t, tdelta
  108.  
  109.             if what == WHAT_EXIT:
  110.                 return what, self._pop(), tdelta
  111.  
  112.             if what == WHAT_LINENO:
  113.                 filename, firstlineno, funcname = self._stack[-1]
  114.                 return what, (filename, lineno, funcname), tdelta
  115.  
  116.             if what == WHAT_DEFINE_FILE:
  117.                 filename = os.path.normcase(os.path.normpath(tdelta))
  118.                 self._filemap[fileno] = filename
  119.             elif what == WHAT_DEFINE_FUNC:
  120.                 filename = self._filemap[fileno]
  121.                 self._funcmap[(fileno, lineno)] = (filename, tdelta)
  122.             elif what == WHAT_ADD_INFO:
  123.                 # value already loaded into self.info; call the
  124.                 # overridable addinfo() handler so higher-level code
  125.                 # can pick up the new value
  126.                 if tdelta == 'current-directory':
  127.                     self.cwd = lineno
  128.                 self.addinfo(tdelta, lineno)
  129.             else:
  130.                 raise ValueError, "unknown event type"
  131.  
  132.     def __iter__(self):
  133.         return self
  134.  
  135.     #
  136.     #  helpers
  137.     #
  138.  
  139.     def _decode_location(self, fileno, lineno):
  140.         try:
  141.             return self._funcmap[(fileno, lineno)]
  142.         except KeyError:
  143.             #
  144.             # This should only be needed when the log file does not
  145.             # contain all the DEFINE_FUNC records needed to allow the
  146.             # function name to be retrieved from the log file.
  147.             #
  148.             if self._loadfile(fileno):
  149.                 filename = funcname = None
  150.             try:
  151.                 filename, funcname = self._funcmap[(fileno, lineno)]
  152.             except KeyError:
  153.                 filename = self._filemap.get(fileno)
  154.                 funcname = None
  155.                 self._funcmap[(fileno, lineno)] = (filename, funcname)
  156.         return filename, funcname
  157.  
  158.     def _loadfile(self, fileno):
  159.         try:
  160.             filename = self._filemap[fileno]
  161.         except KeyError:
  162.             print "Could not identify fileId", fileno
  163.             return 1
  164.         if filename is None:
  165.             return 1
  166.         absname = os.path.normcase(os.path.join(self.cwd, filename))
  167.  
  168.         try:
  169.             fp = open(absname)
  170.         except IOError:
  171.             return
  172.         st = parser.suite(fp.read())
  173.         fp.close()
  174.  
  175.         # Scan the tree looking for def and lambda nodes, filling in
  176.         # self._funcmap with all the available information.
  177.         funcdef = symbol.funcdef
  178.         lambdef = symbol.lambdef
  179.  
  180.         stack = [st.totuple(1)]
  181.  
  182.         while stack:
  183.             tree = stack.pop()
  184.             try:
  185.                 sym = tree[0]
  186.             except (IndexError, TypeError):
  187.                 continue
  188.             if sym == funcdef:
  189.                 self._funcmap[(fileno, tree[2][2])] = filename, tree[2][1]
  190.             elif sym == lambdef:
  191.                 self._funcmap[(fileno, tree[1][2])] = filename, "<lambda>"
  192.             stack.extend(list(tree[1:]))
  193.