Hard-code the symbolizer path in asan_symbolize.py

tools/valgrind/asan/asan_symbolize.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 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.
 
 from third_party import asan_symbolize
 
 import os
 import sys
@@ skipping 14 matching lines @@
 
 def disable_buffering():
   """Makes this process and child processes stdout unbuffered."""
   if not os.environ.get('PYTHONUNBUFFERED'):
     # Since sys.stdout is a C++ object, it's impossible to do
     # sys.stdout.write = lambda...
     sys.stdout = LineBuffered(sys.stdout)
     os.environ['PYTHONUNBUFFERED'] = 'x'
 
 
+def set_symbolizer_path():
+  """Set the path to the llvm-symbolize binary in the Chromium source tree."""
+  if not os.environ.get('LLVM_SYMBOLIZER_PATH'):
+    script_dir = os.path.dirname(os.path.abspath(__file__))
+    # Assume this script resides three levels below src/ (i.e.
+    # src/tools/valgrind/asan/).
+    src_root = os.path.join(script_dir, "..", "..", "..")
+    symbolizer_path = os.path.join(src_root, 'third_party',
+        'llvm-build', 'Release+Asserts', 'bin', 'llvm-symbolizer')
+    assert(os.path.isfile(symbolizer_path))
+    os.environ['LLVM_SYMBOLIZER_PATH'] = os.path.abspath(symbolizer_path)
+
+
 def main():
   disable_buffering()
+  set_symbolizer_path()
   asan_symbolize.demangle = True
   asan_symbolize.fix_filename_patterns = sys.argv[1:]
   asan_symbolize.logfile = sys.stdin
   loop = asan_symbolize.SymbolizationLoop()
   loop.process_logfile()
 
 if __name__ == '__main__':
   main()