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diff --git a/js/src/vm/PlainObject.h b/js/src/vm/PlainObject.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 vm_PlainObject_h
+#define vm_PlainObject_h
+
+#include "gc/AllocKind.h"     // js::gc::AllocKind
+#include "js/Class.h"         // JSClass
+#include "js/RootingAPI.h"    // JS::Handle
+#include "vm/JSObject.h"      // js::NewObjectKind
+#include "vm/NativeObject.h"  // js::NativeObject
+
+struct JS_PUBLIC_API JSContext;
+class JS_PUBLIC_API JSFunction;
+class JS_PUBLIC_API JSObject;
+
+namespace js {
+
+struct IdValuePair;
+
+// Object class for plain native objects created using '{}' object literals,
+// 'new Object()', 'Object.create', etc.
+class PlainObject : public NativeObject {
+ public:
+  static const JSClass class_;
+
+ private:
+#ifdef DEBUG
+  void assertHasNoNonWritableOrAccessorPropExclProto() const;
+#endif
+
+ public:
+  static inline js::PlainObject* createWithShape(JSContext* cx,
+                                                 JS::Handle<SharedShape*> shape,
+                                                 gc::AllocKind kind,
+                                                 NewObjectKind newKind);
+
+  static inline js::PlainObject* createWithShape(
+      JSContext* cx, JS::Handle<SharedShape*> shape,
+      NewObjectKind newKind = GenericObject);
+
+  static inline PlainObject* createWithTemplate(
+      JSContext* cx, JS::Handle<PlainObject*> templateObject);
+
+  static js::PlainObject* createWithTemplateFromDifferentRealm(
+      JSContext* cx, JS::Handle<PlainObject*> templateObject);
+
+  /* Return the allocKind we would use if we were to tenure this object. */
+  inline gc::AllocKind allocKindForTenure() const;
+
+  bool hasNonWritableOrAccessorPropExclProto() const {
+    if (hasFlag(ObjectFlag::HasNonWritableOrAccessorPropExclProto)) {
+      return true;
+    }
+#ifdef DEBUG
+    assertHasNoNonWritableOrAccessorPropExclProto();
+#endif
+    return false;
+  }
+};
+
+// Specializations of 7.3.23 CopyDataProperties(...) for NativeObjects.
+extern bool CopyDataPropertiesNative(JSContext* cx,
+                                     JS::Handle<PlainObject*> target,
+                                     JS::Handle<NativeObject*> from,
+                                     JS::Handle<PlainObject*> excludedItems,
+                                     bool* optimized);
+
+// Specialized call to get the shape to use when creating |this| for a known
+// function callee.
+extern SharedShape* ThisShapeForFunction(JSContext* cx,
+                                         JS::Handle<JSFunction*> callee,
+                                         JS::Handle<JSObject*> newTarget);
+
+// Create a new PlainObject with %Object.prototype% as prototype.
+extern PlainObject* NewPlainObject(JSContext* cx,
+                                   NewObjectKind newKind = GenericObject);
+
+// Like NewPlainObject, but uses the given AllocKind. This allows creating an
+// object with fixed slots available for properties.
+extern PlainObject* NewPlainObjectWithAllocKind(
+    JSContext* cx, gc::AllocKind allocKind,
+    NewObjectKind newKind = GenericObject);
+
+// Create a new PlainObject with the given |proto| as prototype.
+extern PlainObject* NewPlainObjectWithProto(
+    JSContext* cx, HandleObject proto, NewObjectKind newKind = GenericObject);
+
+// Like NewPlainObjectWithProto, but uses the given AllocKind. This allows
+// creating an object with fixed slots available for properties.
+extern PlainObject* NewPlainObjectWithProtoAndAllocKind(
+    JSContext* cx, HandleObject proto, gc::AllocKind allocKind,
+    NewObjectKind newKind = GenericObject);
+
+// Create a plain object with the given properties. The list must not contain
+// duplicate keys or integer keys.
+extern PlainObject* NewPlainObjectWithUniqueNames(JSContext* cx,
+                                                  IdValuePair* properties,
+                                                  size_t nproperties);
+
+// Create a plain object with the given properties. The list may contain integer
+// keys or duplicate keys.
+extern PlainObject* NewPlainObjectWithMaybeDuplicateKeys(
+    JSContext* cx, IdValuePair* properties, size_t nproperties);
+
+}  // namespace js
+
+#endif  // vm_PlainObject_h