diff -r 000000000000 -r 6474c204b198 tools/rb/fix_stack_using_bpsyms.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/rb/fix_stack_using_bpsyms.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,137 @@
+#!/usr/bin/env python
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import with_statement
+
+import sys
+import os
+import re
+import bisect
+
+def prettyFileName(name):
+  if name.startswith("../") or name.startswith("..\\"):
+    # dom_quickstubs.cpp and many .h files show up with relative paths that are useless
+    # and/or don't correspond to the layout of the source tree.
+    return os.path.basename(name) + ":"
+  elif name.startswith("hg:"):
+    bits = name.split(":")
+    if len(bits) == 4:
+      (junk, repo, path, rev) = bits
+      # We could construct an hgweb URL with /file/ or /annotate/, like this:
+      # return "http://%s/annotate/%s/%s#l" % (repo, rev, path)
+      return path  + ":"
+  return name  + ":"
+
+class SymbolFile:
+  def __init__(self, fn):
+    addrs = [] # list of addresses, which will be sorted once we're done initializing
+    funcs = {} # hash: address --> (function name + possible file/line)
+    files = {} # hash: filenum (string) --> prettified filename ready to have a line number appended
+    with open(fn) as f:
+      for line in f:
+        line = line.rstrip()
+        # http://code.google.com/p/google-breakpad/wiki/SymbolFiles
+        if line.startswith("FUNC "):
+          # FUNC <address> <size> <stack_param_size> <name>
+          (junk, rva, size, ss, name) = line.split(None, 4)
+          rva = int(rva,16)
+          funcs[rva] = name
+          addrs.append(rva)
+          lastFuncName = name
+        elif line.startswith("PUBLIC "):
+          # PUBLIC <address> <stack_param_size> <name>
+          (junk, rva, ss, name) = line.split(None, 3)
+          rva = int(rva,16)
+          funcs[rva] = name
+          addrs.append(rva)
+        elif line.startswith("FILE "):
+          # FILE <number> <name>
+          (junk, filenum, name) = line.split(None, 2)
+          files[filenum] = prettyFileName(name)
+        elif line[0] in "0123456789abcdef":
+          # This is one of the "line records" corresponding to the last FUNC record
+          # <address> <size> <line> <filenum>
+          (rva, size, line, filenum) = line.split(None)
+          rva = int(rva,16)
+          file = files[filenum]
+          name = lastFuncName + " [" + file + line + "]"
+          funcs[rva] = name
+          addrs.append(rva)
+        # skip everything else
+    #print "Loaded %d functions from symbol file %s" % (len(funcs), os.path.basename(fn))
+    self.addrs = sorted(addrs)
+    self.funcs = funcs
+
+  def addrToSymbol(self, address):
+    i = bisect.bisect(self.addrs, address) - 1
+    if i > 0:
+      #offset = address - self.addrs[i]
+      return self.funcs[self.addrs[i]]
+    else:
+      return ""
+
+def guessSymbolFile(fn, symbolsDir):
+  """Guess a symbol file based on an object file's basename, ignoring the path and UUID."""
+  fn = os.path.basename(fn)
+  d1 = os.path.join(symbolsDir, fn)
+  if not os.path.exists(d1):
+    fn = fn + ".pdb"
+    d1 = os.path.join(symbolsDir, fn)
+    if not os.path.exists(d1):
+      return None
+  uuids = os.listdir(d1)
+  if len(uuids) == 0:
+    raise Exception("Missing symbol file for " + fn)
+  if len(uuids) > 1:
+    raise Exception("Ambiguous symbol file for " + fn)
+  if fn.endswith(".pdb"):
+    fn = fn[:-4]
+  return os.path.join(d1, uuids[0], fn + ".sym")
+
+parsedSymbolFiles = {}
+def getSymbolFile(file, symbolsDir):
+  p = None
+  if not file in parsedSymbolFiles:
+    symfile = guessSymbolFile(file, symbolsDir)
+    if symfile:
+      p = SymbolFile(symfile)
+    else:
+      p = None
+    parsedSymbolFiles[file] = p
+  else:
+    p = parsedSymbolFiles[file]
+  return p
+
+def addressToSymbol(file, address, symbolsDir):
+  p = getSymbolFile(file, symbolsDir)
+  if p:
+    return p.addrToSymbol(address)
+  else:
+    return ""
+
+line_re = re.compile("^(.*) ?\[([^ ]*) \+(0x[0-9A-F]{1,16})\](.*)$")
+balance_tree_re = re.compile("^([ \|0-9-]*)")
+
+def fixSymbols(line, symbolsDir):
+  result = line_re.match(line)
+  if result is not None:
+    # before allows preservation of balance trees
+    # after allows preservation of counts
+    (before, file, address, after) = result.groups()
+    address = int(address, 16)
+    # throw away the bad symbol, but keep balance tree structure
+    before = balance_tree_re.match(before).groups()[0]
+    symbol = addressToSymbol(file, address, symbolsDir)
+    if not symbol:
+      symbol = "%s + 0x%x" % (os.path.basename(file), address)
+    return before + symbol + after + "\n"
+  else:
+    return line
+
+if __name__ == "__main__":
+  symbolsDir = sys.argv[1]
+  for line in iter(sys.stdin.readline, ''):
+    print fixSymbols(line, symbolsDir),