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Python Source  |  2010-12-26  |  6.1 KB  |  195 lines
  1. import _hotshot
  2. import os.path
  3. import parser
  4. import symbol
  5.  
  6. from _hotshot import \
  7.      WHAT_ENTER, \
  8.      WHAT_EXIT, \
  9.      WHAT_LINENO, \
  10.      WHAT_DEFINE_FILE, \
  11.      WHAT_DEFINE_FUNC, \
  12.      WHAT_ADD_INFO
  13.  
  14.  
  15. __all__ = ["LogReader", "ENTER", "EXIT", "LINE"]
  16.  
  17.  
  18. ENTER = WHAT_ENTER
  19. EXIT  = WHAT_EXIT
  20. LINE  = WHAT_LINENO
  21.  
  22.  
  23. class LogReader:
  24.     def __init__(self, logfn):
  25.         # fileno -> filename
  26.         self._filemap = {}
  27.         # (fileno, lineno) -> filename, funcname
  28.         self._funcmap = {}
  29.  
  30.         self._reader = _hotshot.logreader(logfn)
  31.         self._nextitem = self._reader.next
  32.         self._info = self._reader.info
  33.         if 'current-directory' in self._info:
  34.             self.cwd = self._info['current-directory']
  35.         else:
  36.             self.cwd = None
  37.  
  38.         # This mirrors the call stack of the profiled code as the log
  39.         # is read back in.  It contains tuples of the form:
  40.         #
  41.         #   (file name, line number of function def, function name)
  42.         #
  43.         self._stack = []
  44.         self._append = self._stack.append
  45.         self._pop = self._stack.pop
  46.  
  47.     def close(self):
  48.         self._reader.close()
  49.  
  50.     def fileno(self):
  51.         """Return the file descriptor of the log reader's log file."""
  52.         return self._reader.fileno()
  53.  
  54.     def addinfo(self, key, value):
  55.         """This method is called for each additional ADD_INFO record.
  56.  
  57.         This can be overridden by applications that want to receive
  58.         these events.  The default implementation does not need to be
  59.         called by alternate implementations.
  60.  
  61.         The initial set of ADD_INFO records do not pass through this
  62.         mechanism; this is only needed to receive notification when
  63.         new values are added.  Subclasses can inspect self._info after
  64.         calling LogReader.__init__().
  65.         """
  66.         pass
  67.  
  68.     def get_filename(self, fileno):
  69.         try:
  70.             return self._filemap[fileno]
  71.         except KeyError:
  72.             raise ValueError, "unknown fileno"
  73.  
  74.     def get_filenames(self):
  75.         return self._filemap.values()
  76.  
  77.     def get_fileno(self, filename):
  78.         filename = os.path.normcase(os.path.normpath(filename))
  79.         for fileno, name in self._filemap.items():
  80.             if name == filename:
  81.                 return fileno
  82.         raise ValueError, "unknown filename"
  83.  
  84.     def get_funcname(self, fileno, lineno):
  85.         try:
  86.             return self._funcmap[(fileno, lineno)]
  87.         except KeyError:
  88.             raise ValueError, "unknown function location"
  89.  
  90.     # Iteration support:
  91.     # This adds an optional (& ignored) parameter to next() so that the
  92.     # same bound method can be used as the __getitem__() method -- this
  93.     # avoids using an additional method call which kills the performance.
  94.  
  95.     def next(self, index=0):
  96.         while 1:
  97.             # This call may raise StopIteration:
  98.             what, tdelta, fileno, lineno = self._nextitem()
  99.  
  100.             # handle the most common cases first
  101.  
  102.             if what == WHAT_ENTER:
  103.                 filename, funcname = self._decode_location(fileno, lineno)
  104.                 t = (filename, lineno, funcname)
  105.                 self._append(t)
  106.                 return what, t, tdelta
  107.  
  108.             if what == WHAT_EXIT:
  109.                 try:
  110.                     return what, self._pop(), tdelta
  111.                 except IndexError:
  112.                     raise StopIteration
  113.  
  114.             if what == WHAT_LINENO:
  115.                 filename, firstlineno, funcname = self._stack[-1]
  116.                 return what, (filename, lineno, funcname), tdelta
  117.  
  118.             if what == WHAT_DEFINE_FILE:
  119.                 filename = os.path.normcase(os.path.normpath(tdelta))
  120.                 self._filemap[fileno] = filename
  121.             elif what == WHAT_DEFINE_FUNC:
  122.                 filename = self._filemap[fileno]
  123.                 self._funcmap[(fileno, lineno)] = (filename, tdelta)
  124.             elif what == WHAT_ADD_INFO:
  125.                 # value already loaded into self.info; call the
  126.                 # overridable addinfo() handler so higher-level code
  127.                 # can pick up the new value
  128.                 if tdelta == 'current-directory':
  129.                     self.cwd = lineno
  130.                 self.addinfo(tdelta, lineno)
  131.             else:
  132.                 raise ValueError, "unknown event type"
  133.  
  134.     def __iter__(self):
  135.         return self
  136.  
  137.     #
  138.     #  helpers
  139.     #
  140.  
  141.     def _decode_location(self, fileno, lineno):
  142.         try:
  143.             return self._funcmap[(fileno, lineno)]
  144.         except KeyError:
  145.             #
  146.             # This should only be needed when the log file does not
  147.             # contain all the DEFINE_FUNC records needed to allow the
  148.             # function name to be retrieved from the log file.
  149.             #
  150.             if self._loadfile(fileno):
  151.                 filename = funcname = None
  152.             try:
  153.                 filename, funcname = self._funcmap[(fileno, lineno)]
  154.             except KeyError:
  155.                 filename = self._filemap.get(fileno)
  156.                 funcname = None
  157.                 self._funcmap[(fileno, lineno)] = (filename, funcname)
  158.         return filename, funcname
  159.  
  160.     def _loadfile(self, fileno):
  161.         try:
  162.             filename = self._filemap[fileno]
  163.         except KeyError:
  164.             print "Could not identify fileId", fileno
  165.             return 1
  166.         if filename is None:
  167.             return 1
  168.         absname = os.path.normcase(os.path.join(self.cwd, filename))
  169.  
  170.         try:
  171.             fp = open(absname)
  172.         except IOError:
  173.             return
  174.         st = parser.suite(fp.read())
  175.         fp.close()
  176.  
  177.         # Scan the tree looking for def and lambda nodes, filling in
  178.         # self._funcmap with all the available information.
  179.         funcdef = symbol.funcdef
  180.         lambdef = symbol.lambdef
  181.  
  182.         stack = [st.totuple(1)]
  183.  
  184.         while stack:
  185.             tree = stack.pop()
  186.             try:
  187.                 sym = tree[0]
  188.             except (IndexError, TypeError):
  189.                 continue
  190.             if sym == funcdef:
  191.                 self._funcmap[(fileno, tree[2][2])] = filename, tree[2][1]
  192.             elif sym == lambdef:
  193.                 self._funcmap[(fileno, tree[1][2])] = filename, "<lambda>"
  194.             stack.extend(list(tree[1:]))
  195.