1 files changed, 113 insertions, 0 deletions
diff --git a/dom/base/nsIGlobalObject.cpp b/dom/base/nsIGlobalObject.cpp
new file mode 100644
index 000000000..6479c947b
--- /dev/null
+++ b/dom/base/nsIGlobalObject.cpp
@@ -0,0 +1,113 @@
+/* -*- 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/. */
+
+#include "nsIGlobalObject.h"
+#include "nsContentUtils.h"
+#include "nsThreadUtils.h"
+#include "nsHostObjectProtocolHandler.h"
+
+nsIGlobalObject::~nsIGlobalObject()
+{
+  UnlinkHostObjectURIs();
+}
+
+nsIPrincipal*
+nsIGlobalObject::PrincipalOrNull()
+{
+  JSObject *global = GetGlobalJSObject();
+  if (NS_WARN_IF(!global))
+    return nullptr;
+
+  return nsContentUtils::ObjectPrincipal(global);
+}
+
+void
+nsIGlobalObject::RegisterHostObjectURI(const nsACString& aURI)
+{
+  MOZ_ASSERT(!mHostObjectURIs.Contains(aURI));
+  mHostObjectURIs.AppendElement(aURI);
+}
+
+void
+nsIGlobalObject::UnregisterHostObjectURI(const nsACString& aURI)
+{
+  mHostObjectURIs.RemoveElement(aURI);
+}
+
+namespace {
+
+class UnlinkHostObjectURIsRunnable final : public mozilla::Runnable
+{
+public:
+  explicit UnlinkHostObjectURIsRunnable(nsTArray<nsCString>& aURIs)
+  {
+    mURIs.SwapElements(aURIs);
+  }
+
+  NS_IMETHOD Run() override
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    for (uint32_t index = 0; index < mURIs.Length(); ++index) {
+      nsHostObjectProtocolHandler::RemoveDataEntry(mURIs[index]);
+    }
+
+    return NS_OK;
+  }
+
+private:
+  ~UnlinkHostObjectURIsRunnable() {}
+
+  nsTArray<nsCString> mURIs;
+};
+
+} // namespace
+
+void
+nsIGlobalObject::UnlinkHostObjectURIs()
+{
+  if (mHostObjectURIs.IsEmpty()) {
+    return;
+  }
+
+  if (NS_IsMainThread()) {
+    for (uint32_t index = 0; index < mHostObjectURIs.Length(); ++index) {
+      nsHostObjectProtocolHandler::RemoveDataEntry(mHostObjectURIs[index]);
+    }
+
+    mHostObjectURIs.Clear();
+    return;
+  }
+
+  // nsHostObjectProtocolHandler is main-thread only.
+
+  RefPtr<UnlinkHostObjectURIsRunnable> runnable =
+    new UnlinkHostObjectURIsRunnable(mHostObjectURIs);
+  MOZ_ASSERT(mHostObjectURIs.IsEmpty());
+
+  nsresult rv = NS_DispatchToMainThread(runnable);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Failed to dispatch a runnable to the main-thread.");
+  }
+}
+
+void
+nsIGlobalObject::TraverseHostObjectURIs(nsCycleCollectionTraversalCallback &aCb)
+{
+  if (mHostObjectURIs.IsEmpty()) {
+    return;
+  }
+
+  // Currently we only store BlobImpl objects off the the main-thread and they
+  // are not CCed.
+  if (!NS_IsMainThread()) {
+    return;
+  }
+
+  for (uint32_t index = 0; index < mHostObjectURIs.Length(); ++index) {
+    nsHostObjectProtocolHandler::Traverse(mHostObjectURIs[index], aCb);
+  }
+}