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diff --git a/js/src/frontend/SelfHostedIter.h b/js/src/frontend/SelfHostedIter.h
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+++ b/js/src/frontend/SelfHostedIter.h
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+/* -*- 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 frontend_SelfHostedIter_h
+#define frontend_SelfHostedIter_h
+
+namespace js::frontend {
+
+// `for-of`, `for-await-of`, and spread operations are allowed on
+// self-hosted JS code only when the operand is explicitly marked with
+// `allowContentIter()`.
+//
+// This value is effectful only when emitting self-hosted JS code.
+enum class SelfHostedIter {
+  // The operand is not marked.
+  // Also means "don't care" for non-self-hosted JS case.
+  Deny,
+
+  // The operand is marked.
+  AllowContent,
+
+  // The operand is marked and the `@@iterator` method is on the stack.
+  AllowContentWith,
+
+  // The operand is marked and the `next` method is on the stack.
+  AllowContentWithNext,
+};
+
+} /* namespace js::frontend */
+
+#endif /* frontend_SelfHostedIter_h */