diff --git a/scripts/asan_symbolize.py b/scripts/asan_symbolize.py
new file mode 100755
index 000000000..ffa57ee62
--- /dev/null
+++ b/scripts/asan_symbolize.py
@@ -0,0 +1,469 @@
+#!/usr/bin/env python
+#===- lib/asan/scripts/asan_symbolize.py -----------------------------------===#
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+#===------------------------------------------------------------------------===#
+import argparse
+import bisect
+import getopt
+import os
+import pty
+import re
+import subprocess
+import sys
+import termios
+
+symbolizers = {}
+DEBUG = False
+demangle = False
+binutils_prefix = None
+sysroot_path = None
+binary_name_filter = None
+fix_filename_patterns = None
+logfile = sys.stdin
+
+# FIXME: merge the code that calls fix_filename().
+def fix_filename(file_name):
+  if fix_filename_patterns:
+    for path_to_cut in fix_filename_patterns:
+      file_name = re.sub('.*' + path_to_cut, '', file_name)
+  file_name = re.sub('.*asan_[a-z_]*.cc:[0-9]*', '_asan_rtl_', file_name)
+  file_name = re.sub('.*crtstuff.c:0', '???:0', file_name)
+  return file_name
+
+def sysroot_path_filter(binary_name):
+  return sysroot_path + binary_name
+
+def guess_arch(addr):
+  # Guess which arch we're running. 10 = len('0x') + 8 hex digits.
+  if len(addr) > 10:
+    return 'x86_64'
+  else:
+    return 'i386'
+
+class Symbolizer(object):
+  def __init__(self):
+    pass
+
+  def symbolize(self, addr, binary, offset):
+    """Symbolize the given address (pair of binary and offset).
+
+    Overriden in subclasses.
+    Args:
+        addr: virtual address of an instruction.
+        binary: path to executable/shared object containing this instruction.
+        offset: instruction offset in the @binary.
+    Returns:
+        list of strings (one string for each inlined frame) describing
+        the code locations for this instruction (that is, function name, file
+        name, line and column numbers).
+    """
+    return None
+
+
+class LLVMSymbolizer(Symbolizer):
+  def __init__(self, symbolizer_path, default_arch, system, dsym_hints=[]):
+    super(LLVMSymbolizer, self).__init__()
+    self.symbolizer_path = symbolizer_path
+    self.default_arch = default_arch
+    self.system = system
+    self.dsym_hints = dsym_hints
+    self.pipe = self.open_llvm_symbolizer()
+
+  def open_llvm_symbolizer(self):
+    cmd = [self.symbolizer_path,
+           '--use-symbol-table=true',
+           '--demangle=%s' % demangle,
+           '--functions=short',
+           '--inlining=true',
+           '--default-arch=%s' % self.default_arch]
+    if self.system == 'Darwin':
+      for hint in self.dsym_hints:
+        cmd.append('--dsym-hint=%s' % hint)
+    if DEBUG:
+      print ' '.join(cmd)
+    try:
+      result = subprocess.Popen(cmd, stdin=subprocess.PIPE,
+                                stdout=subprocess.PIPE)
+    except OSError:
+      result = None
+    return result
+
+  def symbolize(self, addr, binary, offset):
+    """Overrides Symbolizer.symbolize."""
+    if not self.pipe:
+      return None
+    result = []
+    try:
+      symbolizer_input = '"%s" %s' % (binary, offset)
+      if DEBUG:
+        print symbolizer_input
+      print >> self.pipe.stdin, symbolizer_input
+      while True:
+        function_name = self.pipe.stdout.readline().rstrip()
+        if not function_name:
+          break
+        file_name = self.pipe.stdout.readline().rstrip()
+        file_name = fix_filename(file_name)
+        if (not function_name.startswith('??') or
+            not file_name.startswith('??')):
+          # Append only non-trivial frames.
+          result.append('%s in %s %s' % (addr, function_name,
+                                         file_name))
+    except Exception:
+      result = []
+    if not result:
+      result = None
+    return result
+
+
+def LLVMSymbolizerFactory(system, default_arch, dsym_hints=[]):
+  symbolizer_path = os.getenv('LLVM_SYMBOLIZER_PATH')
+  if not symbolizer_path:
+    symbolizer_path = os.getenv('ASAN_SYMBOLIZER_PATH')
+    if not symbolizer_path:
+      # Assume llvm-symbolizer is in PATH.
+      symbolizer_path = 'llvm-symbolizer'
+  return LLVMSymbolizer(symbolizer_path, default_arch, system, dsym_hints)
+
+
+class Addr2LineSymbolizer(Symbolizer):
+  def __init__(self, binary):
+    super(Addr2LineSymbolizer, self).__init__()
+    self.binary = binary
+    self.pipe = self.open_addr2line()
+
+  def open_addr2line(self):
+    addr2line_tool = 'addr2line'
+    if binutils_prefix:
+      addr2line_tool = binutils_prefix + addr2line_tool
+    cmd = [addr2line_tool, '-f']
+    if demangle:
+      cmd += ['--demangle']
+    cmd += ['-e', self.binary]
+    if DEBUG:
+      print ' '.join(cmd)
+    return subprocess.Popen(cmd,
+                            stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+
+  def symbolize(self, addr, binary, offset):
+    """Overrides Symbolizer.symbolize."""
+    if self.binary != binary:
+      return None
+    try:
+      print >> self.pipe.stdin, offset
+      function_name = self.pipe.stdout.readline().rstrip()
+      file_name = self.pipe.stdout.readline().rstrip()
+    except Exception:
+      function_name = ''
+      file_name = ''
+    file_name = fix_filename(file_name)
+    return ['%s in %s %s' % (addr, function_name, file_name)]
+
+
+class UnbufferedLineConverter(object):
+  """
+  Wrap a child process that responds to each line of input with one line of
+  output.  Uses pty to trick the child into providing unbuffered output.
+  """
+  def __init__(self, args, close_stderr=False):
+    pid, fd = pty.fork()
+    if pid == 0:
+      # We're the child. Transfer control to command.
+      if close_stderr:
+        dev_null = os.open('/dev/null', 0)
+        os.dup2(dev_null, 2)
+      os.execvp(args[0], args)
+    else:
+      # Disable echoing.
+      attr = termios.tcgetattr(fd)
+      attr[3] = attr[3] & ~termios.ECHO
+      termios.tcsetattr(fd, termios.TCSANOW, attr)
+      # Set up a file()-like interface to the child process
+      self.r = os.fdopen(fd, "r", 1)
+      self.w = os.fdopen(os.dup(fd), "w", 1)
+
+  def convert(self, line):
+    self.w.write(line + "\n")
+    return self.readline()
+
+  def readline(self):
+    return self.r.readline().rstrip()
+
+
+class DarwinSymbolizer(Symbolizer):
+  def __init__(self, addr, binary):
+    super(DarwinSymbolizer, self).__init__()
+    self.binary = binary
+    self.arch = guess_arch(addr)
+    self.open_atos()
+
+  def open_atos(self):
+    if DEBUG:
+      print 'atos -o %s -arch %s' % (self.binary, self.arch)
+    cmdline = ['atos', '-o', self.binary, '-arch', self.arch]
+    self.atos = UnbufferedLineConverter(cmdline, close_stderr=True)
+
+  def symbolize(self, addr, binary, offset):
+    """Overrides Symbolizer.symbolize."""
+    if self.binary != binary:
+      return None
+    atos_line = self.atos.convert('0x%x' % int(offset, 16))
+    while "got symbolicator for" in atos_line:
+      atos_line = self.atos.readline()
+    # A well-formed atos response looks like this:
+    #   foo(type1, type2) (in object.name) (filename.cc:80)
+    match = re.match('^(.*) \(in (.*)\) \((.*:\d*)\)$', atos_line)
+    if DEBUG:
+      print 'atos_line: ', atos_line
+    if match:
+      function_name = match.group(1)
+      function_name = re.sub('\(.*?\)', '', function_name)
+      file_name = fix_filename(match.group(3))
+      return ['%s in %s %s' % (addr, function_name, file_name)]
+    else:
+      return ['%s in %s' % (addr, atos_line)]
+
+
+# Chain several symbolizers so that if one symbolizer fails, we fall back
+# to the next symbolizer in chain.
+class ChainSymbolizer(Symbolizer):
+  def __init__(self, symbolizer_list):
+    super(ChainSymbolizer, self).__init__()
+    self.symbolizer_list = symbolizer_list
+
+  def symbolize(self, addr, binary, offset):
+    """Overrides Symbolizer.symbolize."""
+    for symbolizer in self.symbolizer_list:
+      if symbolizer:
+        result = symbolizer.symbolize(addr, binary, offset)
+        if result:
+          return result
+    return None
+
+  def append_symbolizer(self, symbolizer):
+    self.symbolizer_list.append(symbolizer)
+
+
+def BreakpadSymbolizerFactory(binary):
+  suffix = os.getenv('BREAKPAD_SUFFIX')
+  if suffix:
+    filename = binary + suffix
+    if os.access(filename, os.F_OK):
+      return BreakpadSymbolizer(filename)
+  return None
+
+
+def SystemSymbolizerFactory(system, addr, binary):
+  if system == 'Darwin':
+    return DarwinSymbolizer(addr, binary)
+  elif system == 'Linux':
+    return Addr2LineSymbolizer(binary)
+
+
+class BreakpadSymbolizer(Symbolizer):
+  def __init__(self, filename):
+    super(BreakpadSymbolizer, self).__init__()
+    self.filename = filename
+    lines = file(filename).readlines()
+    self.files = []
+    self.symbols = {}
+    self.address_list = []
+    self.addresses = {}
+    # MODULE mac x86_64 A7001116478B33F18FF9BEDE9F615F190 t
+    fragments = lines[0].rstrip().split()
+    self.arch = fragments[2]
+    self.debug_id = fragments[3]
+    self.binary = ' '.join(fragments[4:])
+    self.parse_lines(lines[1:])
+
+  def parse_lines(self, lines):
+    cur_function_addr = ''
+    for line in lines:
+      fragments = line.split()
+      if fragments[0] == 'FILE':
+        assert int(fragments[1]) == len(self.files)
+        self.files.append(' '.join(fragments[2:]))
+      elif fragments[0] == 'PUBLIC':
+        self.symbols[int(fragments[1], 16)] = ' '.join(fragments[3:])
+      elif fragments[0] in ['CFI', 'STACK']:
+        pass
+      elif fragments[0] == 'FUNC':
+        cur_function_addr = int(fragments[1], 16)
+        if not cur_function_addr in self.symbols.keys():
+          self.symbols[cur_function_addr] = ' '.join(fragments[4:])
+      else:
+        # Line starting with an address.
+        addr = int(fragments[0], 16)
+        self.address_list.append(addr)
+        # Tuple of symbol address, size, line, file number.
+        self.addresses[addr] = (cur_function_addr,
+                                int(fragments[1], 16),
+                                int(fragments[2]),
+                                int(fragments[3]))
+    self.address_list.sort()
+
+  def get_sym_file_line(self, addr):
+    key = None
+    if addr in self.addresses.keys():
+      key = addr
+    else:
+      index = bisect.bisect_left(self.address_list, addr)
+      if index == 0:
+        return None
+      else:
+        key = self.address_list[index - 1]
+    sym_id, size, line_no, file_no = self.addresses[key]
+    symbol = self.symbols[sym_id]
+    filename = self.files[file_no]
+    if addr < key + size:
+      return symbol, filename, line_no
+    else:
+      return None
+
+  def symbolize(self, addr, binary, offset):
+    if self.binary != binary:
+      return None
+    res = self.get_sym_file_line(int(offset, 16))
+    if res:
+      function_name, file_name, line_no = res
+      result = ['%s in %s %s:%d' % (
+          addr, function_name, file_name, line_no)]
+      print result
+      return result
+    else:
+      return None
+
+
+class SymbolizationLoop(object):
+  def __init__(self, binary_name_filter=None, dsym_hint_producer=None):
+    # Used by clients who may want to supply a different binary name.
+    # E.g. in Chrome several binaries may share a single .dSYM.
+    self.binary_name_filter = binary_name_filter
+    self.dsym_hint_producer = dsym_hint_producer
+    self.system = os.uname()[0]
+    if self.system not in ['Linux', 'Darwin', 'FreeBSD']:
+      raise Exception('Unknown system')
+    self.llvm_symbolizers = {}
+    self.last_llvm_symbolizer = None
+    self.dsym_hints = set([])
+    self.frame_no = 0
+
+  def symbolize_address(self, addr, binary, offset):
+    # On non-Darwin (i.e. on platforms without .dSYM debug info) always use
+    # a single symbolizer binary.
+    # On Darwin, if the dsym hint producer is present:
+    #  1. check whether we've seen this binary already; if so,
+    #     use |llvm_symbolizers[binary]|, which has already loaded the debug
+    #     info for this binary (might not be the case for
+    #     |last_llvm_symbolizer|);
+    #  2. otherwise check if we've seen all the hints for this binary already;
+    #     if so, reuse |last_llvm_symbolizer| which has the full set of hints;
+    #  3. otherwise create a new symbolizer and pass all currently known
+    #     .dSYM hints to it.
+    if not binary in self.llvm_symbolizers:
+      use_new_symbolizer = True
+      if self.system == 'Darwin' and self.dsym_hint_producer:
+        dsym_hints_for_binary = set(self.dsym_hint_producer(binary))
+        use_new_symbolizer = bool(dsym_hints_for_binary - self.dsym_hints)
+        self.dsym_hints |= dsym_hints_for_binary
+      if self.last_llvm_symbolizer and not use_new_symbolizer:
+          self.llvm_symbolizers[binary] = self.last_llvm_symbolizer
+      else:
+        self.last_llvm_symbolizer = LLVMSymbolizerFactory(
+            self.system, guess_arch(addr), self.dsym_hints)
+        self.llvm_symbolizers[binary] = self.last_llvm_symbolizer
+    # Use the chain of symbolizers:
+    # Breakpad symbolizer -> LLVM symbolizer -> addr2line/atos
+    # (fall back to next symbolizer if the previous one fails).
+    if not binary in symbolizers:
+      symbolizers[binary] = ChainSymbolizer(
+          [BreakpadSymbolizerFactory(binary), self.llvm_symbolizers[binary]])
+    result = symbolizers[binary].symbolize(addr, binary, offset)
+    if result is None:
+      # Initialize system symbolizer only if other symbolizers failed.
+      symbolizers[binary].append_symbolizer(
+          SystemSymbolizerFactory(self.system, addr, binary))
+      result = symbolizers[binary].symbolize(addr, binary, offset)
+    # The system symbolizer must produce some result.
+    assert result
+    return result
+
+  def get_symbolized_lines(self, symbolized_lines):
+    if not symbolized_lines:
+      return [self.current_line]
+    else:
+      result = []
+      for symbolized_frame in symbolized_lines:
+        result.append('    #%s %s' % (str(self.frame_no), symbolized_frame.rstrip()))
+        self.frame_no += 1
+      return result
+
+  def process_logfile(self):
+    self.frame_no = 0
+    while True:
+      line = logfile.readline()
+      if not line:
+        break
+      processed = self.process_line(line)
+      print '\n'.join(processed)
+
+  def process_line(self, line):
+    self.current_line = line.rstrip()
+    #0 0x7f6e35cf2e45  (/blah/foo.so+0x11fe45)
+    stack_trace_line_format = (
+        '^( *#([0-9]+) *)(0x[0-9a-f]+) *\((.*)\+(0x[0-9a-f]+)\)')
+    match = re.match(stack_trace_line_format, line)
+    if not match:
+      return [self.current_line]
+    if DEBUG:
+      print line
+    _, frameno_str, addr, binary, offset = match.groups()
+    if frameno_str == '0':
+      # Assume that frame #0 is the first frame of new stack trace.
+      self.frame_no = 0
+    original_binary = binary
+    if self.binary_name_filter:
+      binary = self.binary_name_filter(binary)
+    symbolized_line = self.symbolize_address(addr, binary, offset)
+    if not symbolized_line:
+      if original_binary != binary:
+        symbolized_line = self.symbolize_address(addr, binary, offset)
+    return self.get_symbolized_lines(symbolized_line)
+
+
+if __name__ == '__main__':
+  parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter,
+  description='ASan symbolization script',
+  epilog='''Example of use:
+  asan_symbolize.py -c "$HOME/opt/cross/bin/arm-linux-gnueabi-" -s "$HOME/SymbolFiles" < asan.log''')
+  parser.add_argument('path_to_cut', nargs='*',
+    help='pattern to be cut from the result file path ')
+  parser.add_argument('-d','--demangle', action='store_true',
+    help='demangle function names')
+  parser.add_argument('-s', metavar='SYSROOT',
+    help='set path to sysroot for sanitized binaries')
+  parser.add_argument('-c', metavar='CROSS_COMPILE',
+    help='set prefix for binutils')
+  parser.add_argument('-l','--logfile', default=sys.stdin, type=argparse.FileType('r'),
+    help='set log file name to parse, default is stdin')
+  args = parser.parse_args()
+  if args.path_to_cut:
+    fix_filename_patterns = args.path_to_cut
+  if args.demangle:
+    demangle = True
+  if args.s:
+    binary_name_filter = sysroot_path_filter
+    sysroot_path = args.s
+  if args.c:
+    binutils_prefix = args.c
+  if args.logfile:
+    logfile = args.logfile
+  else:
+    logfile = sys.stdin
+  loop = SymbolizationLoop(binary_name_filter)
+  loop.process_logfile()