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# Copyright 2018 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import os
import re
import subprocess
def check_identical_code_folding(dso_path):
"""check whether chrome was built with identical code folding.
Args:
dso_path: path to the dso
Return:
False if the dso is chrome and it was not built with icf,
True otherwise.
"""
if not dso_path.endswith('/chrome.debug'):
return True
# Run 'nm' on the chrome binary and read the output.
nm = subprocess.Popen(['nm', dso_path],
stdout=subprocess.PIPE,
stderr=open(os.devnull, 'w'))
nm_output, _ = nm.communicate()
# Search for addresses of text symbols.
text_addresses = re.findall('^[0-9a-f]+[ ]+[tT] ',
nm_output,
re.MULTILINE)
# Calculate number of text symbols in chrome binary.
num_text_addresses = len(text_addresses)
# Calculate number of unique text symbols in chrome binary.
num_unique_text_addresses = len(set(text_addresses))
# Check that the number of duplicate symbols is at least 10,000.
# - https://crbug.com/813272#c18
if num_text_addresses-num_unique_text_addresses >= 10000:
return True
print('%s was not built with ICF' % dso_path)
print(' num_text_addresses = %d' % num_text_addresses)
print(' num_unique_text_addresses = %d' % num_unique_text_addresses)
return False
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