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diff --git a/js/src/jit/TemplateObject.h b/js/src/jit/TemplateObject.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_TemplateObject_h
+#define jit_TemplateObject_h
+
+#include "vm/NativeObject.h"
+#include "vm/Shape.h"
+
+namespace js {
+namespace jit {
+
+class TemplateNativeObject;
+
+// Wrapper for template objects. This should only expose methods that can be
+// safely called off-thread without racing with the main thread.
+class TemplateObject {
+ protected:
+  JSObject* obj_;
+
+ public:
+  explicit TemplateObject(JSObject* obj) : obj_(obj) {}
+
+  inline gc::AllocKind getAllocKind() const;
+
+  // The following methods rely on the object's group->clasp. This is safe
+  // to read off-thread for template objects.
+  inline bool isNativeObject() const;
+  inline const TemplateNativeObject& asTemplateNativeObject() const;
+  inline bool isArrayObject() const;
+  inline bool isArgumentsObject() const;
+  inline bool isTypedArrayObject() const;
+  inline bool isRegExpObject() const;
+  inline bool isCallObject() const;
+  inline bool isBlockLexicalEnvironmentObject() const;
+  inline bool isPlainObject() const;
+
+  // The shape should not change. This is true for template objects because
+  // they're never exposed to arbitrary script.
+  inline gc::Cell* shape() const;
+};
+
+class TemplateNativeObject : public TemplateObject {
+ protected:
+  NativeObject& asNativeObject() const { return obj_->as<NativeObject>(); }
+
+ public:
+  // Reading slot counts and object slots is safe, as long as we don't touch
+  // the BaseShape (it can change when we create a ShapeTable for the shape).
+  inline bool hasDynamicSlots() const;
+  inline uint32_t numDynamicSlots() const;
+  inline uint32_t numUsedFixedSlots() const;
+  inline uint32_t numFixedSlots() const;
+  inline uint32_t slotSpan() const;
+  inline Value getSlot(uint32_t i) const;
+
+  // Reading ObjectElements fields is safe, except for the flags.
+  // isSharedMemory is an exception: it's debug-only and not called on arrays.
+#ifdef DEBUG
+  inline bool isSharedMemory() const;
+#endif
+  inline uint32_t getDenseCapacity() const;
+  inline uint32_t getDenseInitializedLength() const;
+  inline uint32_t getArrayLength() const;
+  inline bool hasDynamicElements() const;
+  inline const Value* getDenseElements() const;
+
+  inline gc::Cell* regExpShared() const;
+};
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_TemplateObject_h */