Revert of V2 of //tools/binary_size rewrite (diffs).

tools/binary_size/file_format.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.
-
-"""Deals with loading & saving .size files."""
-
-import ast
-import gzip
-import models
-
-
-# File format version for .size files.
-_SERIALIZATION_VERSION = 1
-
-
-def EndsWithMaybeGz(path, suffix):
-  return path.endswith(suffix) or path.endswith(suffix + '.gz')
-
-
-def OpenMaybeGz(path, mode=None):
-  """Calls `gzip.open()` if |path| ends in ".gz", otherwise calls `open()`."""
-  if path.endswith('.gz'):
-    if mode and 'w' in mode:
-      return gzip.GzipFile(path, mode, 1)
-    return gzip.open(path, mode)
-  return open(path, mode or 'r')
-
-
-def _SaveSizeInfoToFile(result, file_obj):
-  """Saves the result to the given file object."""
-  # Store one bucket per line.
-  file_obj.write('%d\n' % _SERIALIZATION_VERSION)
-  file_obj.write('%r\n' % result.section_sizes)
-  file_obj.write('%d\n' % len(result.symbols))
-  prev_section_name = None
-  # Store symbol fields as tab-separated.
-  # Store only non-derived fields.
-  for symbol in result.symbols:
-    if symbol.section_name != prev_section_name:
-      file_obj.write('%s\n' % symbol.section_name)
-      prev_section_name = symbol.section_name
-    # Don't write padding nor name since these are derived values.
-    file_obj.write('%x\t%x\t%s\t%s\n' % (
-        symbol.address, symbol.size_without_padding,
-        symbol.function_signature or symbol.name, symbol.path))
-
-
-def _LoadSizeInfoFromFile(file_obj):
-  """Loads a result from the given file."""
-  lines = iter(file_obj)
-  actual_version = int(next(lines))
-  assert actual_version == _SERIALIZATION_VERSION, (
-      'Version mismatch. Need to write some upgrade code.')
-
-  section_sizes = ast.literal_eval(next(lines))
-  num_syms = int(next(lines))
-  symbol_list = [None] * num_syms
-  section_name = None
-  for i in xrange(num_syms):
-    line = next(lines)[:-1]
-    if '\t' not in line:
-      section_name = line
-      line = next(lines)[:-1]
-    new_sym = models.Symbol.__new__(models.Symbol)
-    parts = line.split('\t')
-    new_sym.section_name = section_name
-    new_sym.address = int(parts[0], 16)
-    new_sym.size = int(parts[1], 16)
-    new_sym.name = parts[2]
-    new_sym.path = parts[3]
-    new_sym.padding = 0  # Derived
-    new_sym.function_signature = None  # Derived
-    symbol_list[i] = new_sym
-
-  return models.SizeInfo(models.SymbolGroup(symbol_list), section_sizes)
-
-
-def SaveSizeInfo(result, path):
-  with OpenMaybeGz(path, 'wb') as f:
-    _SaveSizeInfoToFile(result, f)
-
-
-def LoadSizeInfo(path):
-  with OpenMaybeGz(path) as f:
-    return _LoadSizeInfoFromFile(f)