def METHOD_NAME(data):
  """Parses the merged callgrind_annotate output |data| and generates execution
  counts for all annotated files."""
  out = {}
  data = [p.strip() for p in data.split(SECTION_SEPERATOR)]
  # Most sections are ignored, but a section with:
  #  User-annotated source: <file>
  # precedes a listing of execution count for that <file>.
  for i in range(len(data)):
    if 'User-annotated source' in data[i] and i < len(data) - 1:
      filename = data[i].split(':', 1)[1].strip()
      res = data[i + 1]
      if filename not in out:
        out[filename] = None
      if 'No information' in res:
        res = []
      else:
        res = res.split('\n')
      out[filename] = parse(filename, res, out[filename])
  return out