diff -r 000000000000 -r 6474c204b198 memory/mozalloc/msvc_throw_wrapper.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/memory/mozalloc/msvc_throw_wrapper.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: sw=4 ts=4 et :
+ */
+/* 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/. */
+
+#include <exception>
+
+#if defined(XP_WIN)
+#  define MOZALLOC_EXPORT __declspec(dllexport)
+#endif
+
+#include "mozilla/mozalloc_abort.h"
+
+namespace std {
+
+// NB: user code is not supposed to touch the std:: namespace.  We're
+// doing this after careful review because we want to define our own
+// exception throwing semantics.  Don't try this at home!
+
+__declspec(dllexport) void mozilla_Throw(const exception& e);
+
+void
+mozilla_Throw(const exception& e)
+{
+    mozalloc_abort(e.what());
+}
+
+}  // namespace std