diff -r 000000000000 -r 6474c204b198 js/src/jscrashreport.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jscrashreport.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+#ifndef jscrashreport_h
+#define jscrashreport_h
+
+#include "mozilla/GuardObjects.h"
+
+#include <stdint.h>
+
+namespace js {
+namespace crash {
+
+void
+SnapshotGCStack();
+
+void
+SnapshotErrorStack();
+
+void
+SaveCrashData(uint64_t tag, void *ptr, size_t size);
+
+template<size_t size, unsigned char marker>
+class StackBuffer
+{
+  public:
+    StackBuffer(void *data
+                MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
+    {
+        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+
+        buffer[0] = marker;
+        buffer[1] = '[';
+
+        for (size_t i = 0; i < size; i++) {
+            if (data)
+                buffer[i + 2] = static_cast<unsigned char*>(data)[i];
+            else
+                buffer[i + 2] = 0;
+        }
+
+        buffer[size - 2] = ']';
+        buffer[size - 1] = marker;
+    }
+
+  private:
+    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+    volatile unsigned char buffer[size + 4];
+};
+
+} /* namespace crash */
+} /* namespace js */
+
+#endif /* jscrashreport_h */