Create a star symbol for gaps at the start & end of sections

tools/binary_size/libsupersize/models.py

 # Copyright 2017 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Classes that comprise the data model for binary size analysis.
 
 The primary classes are Symbol, and SymbolGroup.
 
 Description of common properties:
   * address: The start address of the symbol.
         May be 0 (e.g. for .bss or for SymbolGroups).
@@ skipping 342 matching lines @@
       if self.IsBss():
         self._size = sum(s.size for s in self)
       else:
         self._size = sum(s.size for s in self.IterUniqueSymbols())
     return self._size
 
   @property
   def pss(self):
     if self._pss is None:
       if self.IsBss():
-        self._pss = self.size
+        self._pss = float(self.size)
       else:
         self._pss = sum(s.pss for s in self)
     return self._pss
 
   @property
   def padding(self):
     if self._padding is None:
       self._padding = sum(s.padding for s in self.IterUniqueSymbols())
     return self._padding
 
@@ skipping 338 matching lines @@
 
 def _ExtractPrefixBeforeSeparator(string, separator, count=1):
   idx = -len(separator)
   prev_idx = None
   for _ in xrange(count):
     idx = string.find(separator, idx + len(separator))
     if idx < 0:
       break
     prev_idx = idx
   return string[:prev_idx]