1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/vm/IsGivenTypeObject-inl.h b/js/src/vm/IsGivenTypeObject-inl.h
new file mode 100644
index 0000000000..f4b17ebb43
--- /dev/null
+++ b/js/src/vm/IsGivenTypeObject-inl.h
@@ -0,0 +1,33 @@
+/* -*- 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/. */
+
+#ifndef vm_IsGivenTypeObject_inl_h
+#define vm_IsGivenTypeObject_inl_h
+
+#include "js/Class.h"       // js::ESClass
+#include "js/Object.h"      // JS::GetBuiltinClass
+#include "js/RootingAPI.h"  // JS::Handle
+
+#include "vm/JSContext-inl.h"  // JSContext::check
+
+namespace js {
+
+inline bool IsGivenTypeObject(JSContext* cx, JS::Handle<JSObject*> obj,
+                              const ESClass& typeClass, bool* isType) {
+  cx->check(obj);
+
+  ESClass cls;
+  if (!JS::GetBuiltinClass(cx, obj, &cls)) {
+    return false;
+  }
+
+  *isType = cls == typeClass;
+  return true;
+}
+
+}  // namespace js
+
+#endif  // vm_IsGivenTypeObject_inl_h