1 files changed, 154 insertions, 0 deletions
diff --git a/dom/base/WindowDestroyedEvent.cpp b/dom/base/WindowDestroyedEvent.cpp
new file mode 100644
index 0000000000..8b18ada6c2
--- /dev/null
+++ b/dom/base/WindowDestroyedEvent.cpp
@@ -0,0 +1,154 @@
+/* -*- 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 "WindowDestroyedEvent.h"
+
+#include "nsJSUtils.h"
+#include "jsapi.h"
+#include "js/Wrapper.h"
+#include "nsIPrincipal.h"
+#include "nsISupportsPrimitives.h"
+#include "nsIAppStartup.h"
+#include "nsJSPrincipals.h"
+#include "nsCOMPtr.h"
+#include "nsContentUtils.h"
+#include "xpcpublic.h"
+#include "mozilla/AppShutdown.h"
+#include "mozilla/BasePrincipal.h"
+#include "mozilla/Components.h"
+#include "mozilla/ProfilerLabels.h"
+#include "nsFocusManager.h"
+
+namespace mozilla {
+
+struct BrowserCompartmentMatcher : public js::CompartmentFilter {
+  bool match(JS::Compartment* aC) const override {
+    return !xpc::MightBeWebContentCompartment(aC);
+  }
+};
+
+WindowDestroyedEvent::WindowDestroyedEvent(nsGlobalWindowInner* aWindow,
+                                           uint64_t aID, const char* aTopic)
+    : mozilla::Runnable("WindowDestroyedEvent"),
+      mID(aID),
+      mPhase(Phase::Destroying),
+      mTopic(aTopic),
+      mIsInnerWindow(true) {
+  mWindow = do_GetWeakReference(aWindow);
+}
+
+WindowDestroyedEvent::WindowDestroyedEvent(nsGlobalWindowOuter* aWindow,
+                                           uint64_t aID, const char* aTopic)
+    : mozilla::Runnable("WindowDestroyedEvent"),
+      mID(aID),
+      mPhase(Phase::Destroying),
+      mTopic(aTopic),
+      mIsInnerWindow(false) {
+  mWindow = do_GetWeakReference(aWindow);
+}
+
+NS_IMETHODIMP
+WindowDestroyedEvent::Run() {
+  AUTO_PROFILER_LABEL("WindowDestroyedEvent::Run", OTHER);
+
+  nsCOMPtr<nsPIDOMWindowOuter> nukedOuter;
+
+  nsCOMPtr<nsIObserverService> observerService = services::GetObserverService();
+  if (!observerService) {
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsISupportsPRUint64> wrapper =
+      do_CreateInstance(NS_SUPPORTS_PRUINT64_CONTRACTID);
+  if (wrapper) {
+    wrapper->SetData(mID);
+    observerService->NotifyObservers(wrapper, mTopic.get(), nullptr);
+  }
+
+  switch (mPhase) {
+    case Phase::Destroying: {
+      bool skipNukeCrossCompartment = false;
+#ifndef DEBUG
+      skipNukeCrossCompartment =
+          AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdownConfirmed);
+#endif
+
+      if (!skipNukeCrossCompartment) {
+        // The compartment nuking phase might be too expensive, so do that
+        // part off of idle dispatch.
+
+        // For the compartment nuking phase, we dispatch either an
+        // inner-window-nuked or an outer-window-nuked notification.
+        // This will allow tests to wait for compartment nuking to happen.
+        if (mTopic.EqualsLiteral("inner-window-destroyed")) {
+          mTopic.AssignLiteral("inner-window-nuked");
+        } else if (mTopic.EqualsLiteral("outer-window-destroyed")) {
+          mTopic.AssignLiteral("outer-window-nuked");
+        }
+        mPhase = Phase::Nuking;
+
+        nsCOMPtr<nsIRunnable> copy(this);
+        NS_DispatchToCurrentThreadQueue(copy.forget(), 1000,
+                                        EventQueuePriority::Idle);
+      }
+    } break;
+
+    case Phase::Nuking: {
+      nsCOMPtr<nsISupports> window = do_QueryReferent(mWindow);
+      if (window) {
+        nsGlobalWindowInner* currentInner;
+        if (mIsInnerWindow) {
+          currentInner = nsGlobalWindowInner::FromSupports(window);
+        } else {
+          nsGlobalWindowOuter* outer =
+              nsGlobalWindowOuter::FromSupports(window);
+          currentInner = outer->GetCurrentInnerWindowInternal();
+          nukedOuter = outer;
+        }
+        NS_ENSURE_TRUE(currentInner, NS_OK);
+
+        dom::AutoJSAPI jsapi;
+        jsapi.Init();
+        JSContext* cx = jsapi.cx();
+        JS::Rooted<JSObject*> obj(cx, currentInner->GetGlobalJSObject());
+        if (obj && !js::IsSystemRealm(js::GetNonCCWObjectRealm(obj))) {
+          JS::Realm* realm = js::GetNonCCWObjectRealm(obj);
+
+          xpc::NukeJSStackFrames(realm);
+
+          nsCOMPtr<nsIPrincipal> pc =
+              nsJSPrincipals::get(JS::GetRealmPrincipals(realm));
+
+          if (BasePrincipal::Cast(pc)->AddonPolicy()) {
+            // We want to nuke all references to the add-on realm.
+            xpc::NukeAllWrappersForRealm(cx, realm,
+                                         mIsInnerWindow
+                                             ? js::DontNukeWindowReferences
+                                             : js::NukeWindowReferences);
+          } else {
+            // We only want to nuke wrappers for the chrome->content case
+            js::NukeCrossCompartmentWrappers(
+                cx, BrowserCompartmentMatcher(), realm,
+                mIsInnerWindow ? js::DontNukeWindowReferences
+                               : js::NukeWindowReferences,
+                js::NukeIncomingReferences);
+          }
+        }
+      }
+    } break;
+  }
+
+  if (nukedOuter) {
+    nsFocusManager* fm = nsFocusManager::GetFocusManager();
+    if (fm) {
+      fm->WasNuked(nukedOuter);
+    }
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla