Method ComputeCounters

deps/v8/tools/stats-viewer.py:180–215

Group the counters by the suffix of their name. Since the same code-level counter (for instance "X") can result in several variables in the binary counters file that differ only by a two-character prefix (for instance "c:X" and "t:X") counters are grouped by suffix and then displaye

(self)

    self.RebuildMainWindow(counters)

  def ComputeCounters(self):
    """Group the counters by the suffix of their name.

    Since the same code-level counter (for instance "X") can result in
    several variables in the binary counters file that differ only by a
    two-character prefix (for instance "c:X" and "t:X") counters are
    grouped by suffix and then displayed with custom formatting
    depending on their prefix.

    Returns:
      A mapping from suffixes to a list of counters with that suffix,
      sorted by prefix.
    """
    names = {}
    for i in range(self.data.CountersInUse()):
      counter = self.data.Counter(i)
      name = counter.Name()
      names[name] = counter

    # By sorting the keys we ensure that the prefixes always come in the
    # same order ("c:" before "t:") which looks more consistent in the
    # ui.
    sorted_keys = names.keys()
    sorted_keys.sort()

    # Group together the names whose suffix after a ':' are the same.
    groups = {}
    for name in sorted_keys:
      counter = names[name]
      if ":" in name:
        name = name[name.find(":")+1:]
      if not name in groups:
        groups[name] = []
      groups[name].append(counter)

    return groups

  def RebuildMainWindow(self, groups):
    """Tear down and rebuild the main window.