- Add binary size analysis tool from Chromium.

runtime/third_party/binary_size/src/binary_size_utils.py

+# Copyright 2014 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.
+
+"""Common utilities for tools that deal with binary size information.
+"""
+
+import logging
+import re
+
+
+def ParseNm(nm_lines):
+  """Parse nm output, returning data for all relevant (to binary size)
+  symbols and ignoring the rest.
+
+  Args:
+      nm_lines: an iterable over lines of nm output.
+
+  Yields:
+      (symbol name, symbol type, symbol size, source file path).
+
+      Path may be None if nm couldn't figure out the source file.
+  """
+
+  # Match lines with size, symbol, optional location, optional discriminator
+  sym_re = re.compile(r'^([0-9a-f]{8,}) ' # address (8+ hex digits)
+                      '([0-9a-f]{8,}) ' # size (8+ hex digits)
+                      '(.) ' # symbol type, one character
+                      '([^\t]+)' # symbol name, separated from next by tab
+                      '(?:\t(.*):[\d\?]+)?.*$') # location
+  # Match lines with addr but no size.
+  addr_re = re.compile(r'^[0-9a-f]{8,} (.) ([^\t]+)(?:\t.*)?$')
+  # Match lines that don't have an address at all -- typically external symbols.
+  noaddr_re = re.compile(r'^ {8,} (.) (.*)$')
+  # Match lines with no symbol name, only addr and type
+  addr_only_re = re.compile(r'^[0-9a-f]{8,} (.)$')
+
+  seen_lines = set()
+  for line in nm_lines:
+    line = line.rstrip()
+    if line in seen_lines:
+      # nm outputs identical lines at times. We don't want to treat
+      # those as distinct symbols because that would make no sense.
+      continue
+    seen_lines.add(line)
+    match = sym_re.match(line)
+    if match:
+      address, size, sym_type, sym = match.groups()[0:4]
+      size = int(size, 16)
+      if sym_type in ('B', 'b'):
+        continue  # skip all BSS for now.
+      path = match.group(5)
+      yield sym, sym_type, size, path, address
+      continue
+    match = addr_re.match(line)
+    if match:
+      # sym_type, sym = match.groups()[0:2]
+      continue  # No size == we don't care.
+    match = noaddr_re.match(line)
+    if match:
+      sym_type, sym = match.groups()
+      if sym_type in ('U', 'w'):
+        continue  # external or weak symbol
+    match = addr_only_re.match(line)
+    if match:
+      continue  # Nothing to do.
+
+
+    # If we reach this part of the loop, there was something in the
+    # line that we didn't expect or recognize.
+    logging.warning('nm output parser failed to parse: %s', repr(line))