1 files changed, 41 insertions, 0 deletions
diff --git a/dom/bindings/XrayExpandoClass.h b/dom/bindings/XrayExpandoClass.h
new file mode 100644
index 000000000..af5c1e9ba
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+++ b/dom/bindings/XrayExpandoClass.h
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/**
+ * This file declares a macro for defining Xray expando classes and declares the
+ * default Xray expando class.  The actual definition of that default class
+ * lives elsewhere.
+ */
+#ifndef mozilla_dom_XrayExpandoClass_h
+#define mozilla_dom_XrayExpandoClass_h
+
+/*
+ * maybeStatic_ Should be either `static` or nothing (because some Xray expando
+ * classes are not static).
+ *
+ * name_ should be the name of the variable.
+ *
+ * extraSlots_ should be how many extra slots to give the class, in addition to
+ * the ones Xray expandos want.
+ */
+#define DEFINE_XRAY_EXPANDO_CLASS(maybeStatic_, name_, extraSlots_)	\
+  maybeStatic_ const JSClass name_ = {					\
+    "XrayExpandoObject",						\
+    JSCLASS_HAS_RESERVED_SLOTS(xpc::JSSLOT_EXPANDO_COUNT +		\
+			       (extraSlots_)) |				\
+    JSCLASS_FOREGROUND_FINALIZE,					\
+    &xpc::XrayExpandoObjectClassOps					\
+  }
+
+namespace mozilla {
+namespace dom {
+
+extern const JSClass DefaultXrayExpandoObjectClass;
+
+} // namespace mozilla
+} // namespace dom
+
+#endif /* mozilla_dom_XrayExpandoClass_h */