Index: tools/win/pdb_compare_globals.py
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diff --git a/tools/win/pdb_compare_globals.py b/tools/win/pdb_compare_globals.py
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new file mode 100644
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index 0000000000000000000000000000000000000000..0455a5d2dddbc4dab1d926061b1745e485152248
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--- /dev/null
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+++ b/tools/win/pdb_compare_globals.py
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@@ -0,0 +1,92 @@
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+# Copyright (c) 2016 The Chromium Authors. All rights reserved.
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+# Use of this source code is governed by a BSD-style license that can be
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+# found in the LICENSE file.
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+
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+"""
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+This script uses ShowGlobals.exe to compare two PDBs to see what interesting
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+globals are present in one but not the other. You can either pass in a .pdb file
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+or you can pass in a .txt file that contains the results of calling ShowGlobals.
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+This helps when investigating size regressions. Often code-size regressions are
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+associated with global variable changes, and those global variables can be
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+easier to track and investigate than the code.
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+
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+Typical output from ShowGlobals.exe is lines like these:
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+
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+ #Dups DupSize Size Section Symbol name PDB name
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+
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+ 0 0 122784 2 kBrotliDictionary chrome.dll.pdb
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+ 1 1824 0 0 LcidToLocaleNameTable chrome.dll.pdb
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+"""
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+
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+import os
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+import subprocess
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+import sys
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+
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+
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+def LoadSymbols(pdb_name):
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+ result = {}
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+ extension = os.path.splitext(pdb_name)[1].lower()
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+ if extension in ['.pdb']:
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+ command = 'ShowGlobals.exe "%s"' % pdb_name
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+ lines = subprocess.check_output(command).splitlines()
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+ elif extension in ['.txt']:
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+ lines = open(pdb_name).readlines()
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+ else:
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+ print 'Unrecognized extension in %s' % pdb_name
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+ return result
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+ for line in lines:
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+ parts = line.split('\t')
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+ if len(parts) >= 5 and not line.startswith('#'):
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+ # Put the first four columns (the numerical data associated with a symbol)
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+ # into a dictionary indexed by the fifth column, which is the symbol name.
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+ symbol_name = parts[4]
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+ result[symbol_name] = parts[:4]
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+ return result
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+
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+
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+def ShowExtras(symbols_A, symbols_B, name_A, name_B):
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+ print 'Symbols that are in %s but not in %s' % (name_A, name_B)
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+ for key in symbols_A:
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+ if not key in symbols_B:
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+ # Print all the numerical data, followed by the symbol name, separated by
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+ # tabs.
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+ print '\t'.join(symbols_A[key] + [key])
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+ print
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+
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+
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+def ShowDifferences(symbols_A, symbols_B, name_A, name_B):
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+ print 'Symbols that are changed from %s to %s' % (name_A, name_B)
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+ for key in symbols_A:
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+ if key in symbols_B:
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+ value_a = symbols_A[key]
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+ value_b = symbols_B[key]
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+ if value_a != value_b:
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+ # Print the symbol name and then the two versions of the numerical data,
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+ # indented.
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+ print '%s changed from/to:' % key
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+ print '\t' + '\t'.join(value_a)
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+ print '\t' + '\t'.join(value_b)
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+ print
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+
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+
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+def main():
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+ symbols_1 = LoadSymbols(sys.argv[1])
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+ symbols_2 = LoadSymbols(sys.argv[2])
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+
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+ if len(symbols_1) == 0:
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+ print 'No data found in %s - fastlink?' % sys.argv[1]
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+ return
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+ if len(symbols_2) == 0:
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+ print 'No data found in %s - fastlink?' % sys.argv[2]
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+ return
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+
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+ print ('%d interesting globals in %s, %d interesting globals in %s' %
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+ (len(symbols_1), sys.argv[1], len(symbols_2), sys.argv[2]))
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+
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+ ShowExtras(symbols_1, symbols_2, sys.argv[1], sys.argv[2])
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+ ShowExtras(symbols_2, symbols_1, sys.argv[2], sys.argv[1])
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+ ShowDifferences(symbols_1, symbols_2, sys.argv[1], sys.argv[2])
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+
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+
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+if __name__ == '__main__':
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+ sys.exit(main())
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