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

tools/binary_size/console.py

Index: tools/binary_size/console.py
diff --git a/tools/binary_size/console.py b/tools/binary_size/console.py
new file mode 100755
index 0000000000000000000000000000000000000000..a2353a0c387afa31e3fccf3cd4ad7f81601932e3
--- /dev/null
+++ b/tools/binary_size/console.py
@@ -0,0 +1,189 @@
+#!/usr/bin/env python
+# 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.
+
+"""Tool for analyzing binary size of executables using nm or linker map files.
+
+Map files can be created by passing "-Map Foo.map" to the linker. If a map file
+is unavailable, this tool can also be pointed at an unstripped executable, but
+the information does not seem to be as accurate in this case.
+
+Inspired by SymbolSort for Windows:
+  https://github.com/adrianstone55/SymbolSort
+"""
+
+import argparse
+import atexit
+import code
+import contextlib
+import itertools
+import logging
+import os
+import readline
+import subprocess
+import sys
+
+import describe
+import file_format
+import helpers
+import map2size
+import models
+
+
+# Number of lines before using less for Print().
+_THRESHOLD_FOR_PAGER = 30
+
+
+@contextlib.contextmanager
+def _LessPipe():
+  """Output to `less`. Yields a file object to write to."""
+  try:
+    proc = subprocess.Popen(['less'], stdin=subprocess.PIPE, stdout=sys.stdout)
+    yield proc.stdin
+    proc.stdin.close()
+
+    proc.wait()
+  except IOError:
+    pass  # Happens when less is quit before all data is written.
+  except KeyboardInterrupt:
+    pass  # Assume used to break out of less.
+
+
+class _Session(object):
+  _readline_initialized = False
+
+  def __init__(self, extra_vars):
+    self._variables = {
+        'Print': self._PrintFunc,
+        'Write': self._WriteFunc,
+        'Diff': models.Diff,
+    }
+    self._variables.update(extra_vars)
+
+  def _PrintFunc(self, obj, verbose=False, use_pager=None):
+    """Prints out the given Symbol / SymbolGroup / SymbolDiff / SizeInfo.
+
+    Args:
+      obj: The object to be printed.
+      use_pager: Whether to pipe output through `less`. Ignored when |obj| is a
+          Symbol.
+    """
+    lines = describe.GenerateLines(obj, verbose=verbose)
+    if use_pager is None and sys.stdout.isatty():
+      # Does not take into account line-wrapping... Oh well.
+      first_lines = list(itertools.islice(lines, _THRESHOLD_FOR_PAGER))
+      if len(first_lines) == _THRESHOLD_FOR_PAGER:
+        use_pager = True
+      lines = itertools.chain(first_lines, lines)
+
+    if use_pager:
+      with _LessPipe() as stdin:
+        describe.WriteLines(lines, stdin.write)
+    else:
+      describe.WriteLines(lines, sys.stdout.write)
+
+
+  def _WriteFunc(self, obj, path, verbose=False):
+    """Same as Print(), but writes to a file.
+
+    Example: Write(Diff(size_info2, size_info1), 'output.txt')
+    """
+    parent_dir = os.path.dirname(path)
+    if parent_dir and not os.path.exists(parent_dir):
+      os.makedirs(parent_dir)
+    with file_format.OpenMaybeGz(path, 'w') as file_obj:
+      lines = describe.GenerateLines(obj, verbose=verbose)
+      describe.WriteLines(lines, file_obj.write)
+
+
+  def _CreateBanner(self):
+    symbol_info_keys = sorted(m for m in dir(models.SizeInfo) if m[0] != '_')
+    symbol_group_keys = sorted(m for m in dir(models.SymbolGroup)
+                               if m[0] != '_')
+    symbol_diff_keys = sorted(m for m in dir(models.SymbolDiff)
+                              if m[0] != '_' and m not in symbol_group_keys)
+    functions = sorted(k for k in self._variables if k[0].isupper())
+    variables = sorted(k for k in self._variables if k[0].islower())
+    return '\n'.join([
+        '*' * 80,
+        'Entering interactive Python shell. Here is some inspiration:',
+        '',
+        '# Show pydoc for main types:',
+        'import models',
+        'help(models)',
+        '',
+        '# Show two levels of .text, grouped by first two subdirectories',
+        'text_syms = size_info1.symbols.WhereInSection("t")',
+        'by_path = text_syms.GroupByPath(depth=2)',
+        'Print(by_path.WhereBiggerThan(1024))',
+        '',
+        '# Show all non-vtable generated symbols',
+        'generated_syms = size_info1.symbols.WhereIsGenerated()',
+        'Print(generated_syms.WhereNameMatches("vtable").Inverted())',
+        '',
+        '*' * 80,
+        'Here is some quick reference:',
+        '',
+        'SizeInfo: %s' % ', '.join(symbol_info_keys),
+        'SymbolGroup: %s' % ', '.join(symbol_group_keys),
+        'SymbolDiff (extends SymbolGroup): %s' % ', '.join(symbol_diff_keys),
+        '',
+        'Functions: %s' % ', '.join('%s()' % f for f in functions),
+        'Variables: %s' % ', '.join(variables),
+        '',
+    ])
+
+  @classmethod
+  def _InitReadline(cls):
+    if cls._readline_initialized:
+      return
+    cls._readline_initialized = True
+    # Without initializing readline, arrow keys don't even work!
+    readline.parse_and_bind('tab: complete')
+    history_file = os.path.join(os.path.expanduser('~'),
+                                '.binary_size_query_history')
+    if os.path.exists(history_file):
+      readline.read_history_file(history_file)
+    atexit.register(lambda: readline.write_history_file(history_file))
+
+  def Eval(self, query):
+    eval_result = eval(query, self._variables)
+    if eval_result:
+      self._PrintFunc(eval_result)
+
+  def GoInteractive(self):
+    _Session._InitReadline()
+    code.InteractiveConsole(self._variables).interact(self._CreateBanner())
+
+
+def main(argv):
+  parser = argparse.ArgumentParser()
+  parser.add_argument('inputs', nargs='*',
+                      help='Input .size/.map files to load. They will be '
+                           'mapped to variables as: size_info1, size_info2,'
+                           ' etc.')
+  parser.add_argument('--query',
+                      help='Print the result of the given snippet. Example: '
+                           'size_info1.symbols.WhereInSection("d").'
+                           'WhereBiggerThan(100)')
+  map2size.AddOptions(parser)
+  args = helpers.AddCommonOptionsAndParseArgs(parser, argv)
+
+  info_variables = {}
+  for i, path in enumerate(args.inputs):
+    size_info = map2size.AnalyzeWithArgs(args, path)
+    info_variables['size_info%d' % (i + 1)] = size_info
+
+  session = _Session(info_variables)
+
+  if args.query:
+    logging.info('Running query from command-line.')
+    session.Eval(args.query)
+  else:
+    logging.info('Entering interactive console.')
+    session.GoInteractive()
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))