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diff --git a/js/src/jit/ABIFunctions.h b/js/src/jit/ABIFunctions.h
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+++ b/js/src/jit/ABIFunctions.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 jit_ABIFunctions_h
+#define jit_ABIFunctions_h
+
+#include "jstypes.h"  // JS_FUNC_TO_DATA_PTR
+
+namespace js {
+namespace jit {
+
+// This class is used to ensure that all known targets of callWithABI are
+// registered here. Otherwise, this would raise a static assertion at compile
+// time.
+template <typename Sig, Sig fun>
+struct ABIFunctionData {
+  static const bool registered = false;
+};
+
+template <typename Sig, Sig fun>
+struct ABIFunction {
+  void* address() const { return JS_FUNC_TO_DATA_PTR(void*, fun); }
+
+  // If this assertion fails, you are likely in the context of a
+  // `callWithABI<Sig, fn>()` call. This error indicates that ABIFunction has
+  // not been specialized for `<Sig, fn>` by the time of this call.
+  //
+  // This can be fixed by adding the function signature to either
+  // ABIFUNCTION_LIST or ABIFUNCTION_AND_TYPE_LIST (if overloaded) within
+  // `ABIFunctionList-inl.h` and to add an `#include` statement of this header
+  // in the file which is making the call to `callWithABI<Sig, fn>()`.
+  static_assert(ABIFunctionData<Sig, fun>::registered,
+                "ABI function is not registered.");
+};
+
+template <typename Sig>
+struct ABIFunctionSignatureData {
+  static const bool registered = false;
+};
+
+template <typename Sig>
+struct ABIFunctionSignature {
+  void* address(Sig fun) const { return JS_FUNC_TO_DATA_PTR(void*, fun); }
+
+  // If this assertion fails, you are likely in the context of a
+  // `DynamicFunction<Sig>(fn)` call. This error indicates that
+  // ABIFunctionSignature has not been specialized for `Sig` by the time of this
+  // call.
+  //
+  // This can be fixed by adding the function signature to ABIFUNCTIONSIG_LIST
+  // within `ABIFunctionList-inl.h` and to add an `#include` statement of this
+  // header in the file which is making the call to `DynamicFunction<Sig>(fn)`.
+  static_assert(ABIFunctionSignatureData<Sig>::registered,
+                "ABI function signature is not registered.");
+};
+
+// This is a structure created to ensure that the dynamically computed
+// function pointer is well typed.
+//
+// It is meant to be created only through DynamicFunction function calls. In
+// extremelly rare cases, such as VMFunctions, it might be produced as a result
+// of GetVMFunctionTarget.
+struct DynFn {
+  void* address;
+};
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_VMFunctions_h */