1 files changed, 89 insertions, 0 deletions
diff --git a/dom/base/nsIGlobalObject.h b/dom/base/nsIGlobalObject.h
new file mode 100644
index 0000000000..f94e5c8d04
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+++ b/dom/base/nsIGlobalObject.h
@@ -0,0 +1,89 @@
+/* -*- 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 nsIGlobalObject_h__
+#define nsIGlobalObject_h__
+
+#include "nsISupports.h"
+#include "nsTArray.h"
+#include "js/TypeDecls.h"
+
+#define NS_IGLOBALOBJECT_IID \
+{ 0x11afa8be, 0xd997, 0x4e07, \
+{ 0xa6, 0xa3, 0x6f, 0x87, 0x2e, 0xc3, 0xee, 0x7f } }
+
+class nsACString;
+class nsCString;
+class nsCycleCollectionTraversalCallback;
+class nsIPrincipal;
+
+class nsIGlobalObject : public nsISupports
+{
+  nsTArray<nsCString> mHostObjectURIs;
+  bool mIsDying;
+
+protected:
+  nsIGlobalObject()
+   : mIsDying(false)
+  {}
+
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IGLOBALOBJECT_IID)
+
+  /**
+   * This check is added to deal with Promise microtask queues. On the main
+   * thread, we do not impose restrictions about when script stops running or
+   * when runnables can no longer be dispatched to the main thread. This means
+   * it is possible for a Promise chain to keep resolving an infinite chain of
+   * promises, preventing the browser from shutting down. See Bug 1058695. To
+   * prevent this, the nsGlobalWindow subclass sets this flag when it is
+   * closed. The Promise implementation checks this and prohibits new runnables
+   * from being dispatched.
+   *
+   * We pair this with checks during processing the promise microtask queue
+   * that pops up the slow script dialog when the Promise queue is preventing
+   * a window from going away.
+   */
+  bool
+  IsDying() const
+  {
+    return mIsDying;
+  }
+
+  // GetGlobalJSObject may return a gray object.  If this ever changes so that
+  // it stops doing that, please simplify the code in FindAssociatedGlobal in
+  // BindingUtils.h that does JS::ExposeObjectToActiveJS on the return value of
+  // GetGlobalJSObject.  Also, in that case the JS::ExposeObjectToActiveJS in
+  // AutoJSAPI::InitInternal can probably be removed.  And also the similar
+  // calls in XrayWrapper and nsGlobalWindow.
+  virtual JSObject* GetGlobalJSObject() = 0;
+
+  // This method is not meant to be overridden.
+  nsIPrincipal* PrincipalOrNull();
+
+  void RegisterHostObjectURI(const nsACString& aURI);
+
+  void UnregisterHostObjectURI(const nsACString& aURI);
+
+  // Any CC class inheriting nsIGlobalObject should call these 2 methods if it
+  // exposes the URL API.
+  void UnlinkHostObjectURIs();
+  void TraverseHostObjectURIs(nsCycleCollectionTraversalCallback &aCb);
+
+protected:
+  virtual ~nsIGlobalObject();
+
+  void
+  StartDying()
+  {
+    mIsDying = true;
+  }
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIGlobalObject,
+                              NS_IGLOBALOBJECT_IID)
+
+#endif // nsIGlobalObject_h__