Compute an error hash for suppressions

tools/heapcheck/heapcheck_test.py

 #!/usr/bin/python
 # Copyright (c) 2006-2009 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.
 
 # heapcheck_test.py
 
 """Wrapper for running the test under heapchecker and analyzing the output."""
 
 import datetime
@@ skipping 105 matching lines @@
               print 'Aborting...'
               return 3
            # Print the report and set the return code to 1.
             print ('Leak of %d bytes in %d objects allocated from:'
                    % tuple(cur_leak_signature))
             print '\n'.join(cur_report)
             return_code = 1
             # Generate the suppression iff the stack contains more than one
             # frame (otherwise it's likely to be broken)
             if len(cur_stack) > 1:
-              print '\nSuppression:\n{'
+              print '\nSuppression (error hash=#%016X#):\n{' \
+                  % (hash("".join(cur_stack)) & 0xffffffffffffffff)
               print '   <insert_a_suppression_name_here>'
               print '   Heapcheck:Leak'
               for frame in cur_stack:
                 print '   fun:' + frame
               print '}\n\n\n'
             else:
               print ('This stack may be broken due to omitted frame pointers. '
                      'It is not recommended to suppress it.')
           else:
             # Update the suppressions histogram.
@@ skipping 65 matching lines @@
                  'http://dev.chromium.org/developers/how-tos/'
                  'using-the-heap-leak-checker')
     return retcode
 
 
 def RunTool(args, supp_files, module):
   tool = HeapcheckWrapper(supp_files)
   MODULES_TO_SANITY_CHECK = ["base"]
   check_sanity = module in MODULES_TO_SANITY_CHECK
   return tool.Main(args[1:], check_sanity)