Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1615 insertions, 0 deletions

diff --git a/dom/base/nsFrameMessageManager.cpp b/dom/base/nsFrameMessageManager.cpp
new file mode 100644
index 0000000000..9f6a321712
--- /dev/null
+++ b/dom/base/nsFrameMessageManager.cpp
@@ -0,0 +1,1615 @@
+/* -*- 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 "nsFrameMessageManager.h"
+
+#include <algorithm>
+#include <cmath>
+#include <cstddef>
+#include <cstdint>
+#include <new>
+#include <utility>
+#include "ContentChild.h"
+#include "ErrorList.h"
+#include "GeckoProfiler.h"
+#include "base/process_util.h"
+#include "chrome/common/ipc_channel.h"
+#include "js/CompilationAndEvaluation.h"
+#include "js/JSON.h"
+#include "js/SourceText.h"
+#include "js/StructuredClone.h"
+#include "js/Wrapper.h"
+#include "jsapi.h"
+#include "jsfriendapi.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/MacroForEach.h"
+#include "mozilla/NotNull.h"
+#include "mozilla/OwningNonNull.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/ScriptPreloader.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/TelemetryHistogramEnums.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/TypedEnumBits.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/CallbackObject.h"
+#include "mozilla/dom/ChildProcessMessageManager.h"
+#include "mozilla/dom/ChromeMessageBroadcaster.h"
+#include "mozilla/dom/ContentProcessMessageManager.h"
+#include "mozilla/dom/DOMTypes.h"
+#include "mozilla/dom/MessageBroadcaster.h"
+#include "mozilla/dom/MessageListenerManager.h"
+#include "mozilla/dom/MessageManagerBinding.h"
+#include "mozilla/dom/MessagePort.h"
+#include "mozilla/dom/ParentProcessMessageManager.h"
+#include "mozilla/dom/ProcessMessageManager.h"
+#include "mozilla/dom/RootedDictionary.h"
+#include "mozilla/dom/SameProcessMessageQueue.h"
+#include "mozilla/dom/ScriptLoader.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/dom/ToJSValue.h"
+#include "mozilla/dom/MessageManagerCallback.h"
+#include "mozilla/dom/ipc/SharedMap.h"
+#include "mozilla/dom/ipc/StructuredCloneData.h"
+#include "nsASCIIMask.h"
+#include "nsBaseHashtable.h"
+#include "nsCOMPtr.h"
+#include "nsClassHashtable.h"
+#include "nsComponentManagerUtils.h"
+#include "nsContentUtils.h"
+#include "nsCycleCollectionNoteChild.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsDataHashtable.h"
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsFrameMessageManager.h"
+#include "nsHashKeys.h"
+#include "nsIChannel.h"
+#include "nsIConsoleService.h"
+#include "nsIContentPolicy.h"
+#include "nsIInputStream.h"
+#include "nsILoadInfo.h"
+#include "nsIMemoryReporter.h"
+#include "nsIMessageManager.h"
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+#include "nsIProtocolHandler.h"
+#include "nsIScriptError.h"
+#include "nsISupports.h"
+#include "nsISupportsUtils.h"
+#include "nsIURI.h"
+#include "nsIWeakReferenceUtils.h"
+#include "nsIXPConnect.h"
+#include "nsJSUtils.h"
+#include "nsLiteralString.h"
+#include "nsNetUtil.h"
+#include "nsPrintfCString.h"
+#include "nsQueryObject.h"
+#include "nsServiceManagerUtils.h"
+#include "nsString.h"
+#include "nsStringFlags.h"
+#include "nsStringFwd.h"
+#include "nsTArray.h"
+#include "nsTLiteralString.h"
+#include "nsTObserverArray.h"
+#include "nsTPromiseFlatString.h"
+#include "nsTStringRepr.h"
+#include "nsThreadUtils.h"
+#include "nsXULAppAPI.h"
+#include "nscore.h"
+#include "xpcpublic.h"
+
+#ifdef XP_WIN
+#  if defined(SendMessage)
+#    undef SendMessage
+#  endif
+#endif
+
+#ifdef FUZZING
+#  include "MessageManagerFuzzer.h"
+#endif
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::dom::ipc;
+
+nsFrameMessageManager::nsFrameMessageManager(MessageManagerCallback* aCallback,
+                                             MessageManagerFlags aFlags)
+    : mChrome(aFlags & MessageManagerFlags::MM_CHROME),
+      mGlobal(aFlags & MessageManagerFlags::MM_GLOBAL),
+      mIsProcessManager(aFlags & MessageManagerFlags::MM_PROCESSMANAGER),
+      mIsBroadcaster(aFlags & MessageManagerFlags::MM_BROADCASTER),
+      mOwnsCallback(aFlags & MessageManagerFlags::MM_OWNSCALLBACK),
+      mHandlingMessage(false),
+      mClosed(false),
+      mDisconnected(false),
+      mCallback(aCallback) {
+  NS_ASSERTION(!mIsBroadcaster || !mCallback,
+               "Broadcasters cannot have callbacks!");
+  if (mOwnsCallback) {
+    mOwnedCallback = WrapUnique(aCallback);
+  }
+}
+
+nsFrameMessageManager::~nsFrameMessageManager() {
+  for (int32_t i = mChildManagers.Length(); i > 0; --i) {
+    mChildManagers[i - 1]->Disconnect(false);
+  }
+  if (mIsProcessManager) {
+    if (this == sParentProcessManager) {
+      sParentProcessManager = nullptr;
+    }
+    if (this == sChildProcessManager) {
+      sChildProcessManager = nullptr;
+      delete mozilla::dom::SameProcessMessageQueue::Get();
+    }
+    if (this == sSameProcessParentManager) {
+      sSameProcessParentManager = nullptr;
+    }
+  }
+}
+
+inline void ImplCycleCollectionTraverse(
+    nsCycleCollectionTraversalCallback& aCallback,
+    nsMessageListenerInfo& aField, const char* aName, uint32_t aFlags = 0) {
+  ImplCycleCollectionTraverse(aCallback, aField.mStrongListener, aName, aFlags);
+  ImplCycleCollectionTraverse(aCallback, aField.mWeakListener, aName, aFlags);
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsFrameMessageManager)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsFrameMessageManager)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mListeners)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mChildManagers)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSharedData)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsFrameMessageManager)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mInitialProcessData)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsFrameMessageManager)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mListeners)
+  for (int32_t i = tmp->mChildManagers.Length(); i > 0; --i) {
+    tmp->mChildManagers[i - 1]->Disconnect(false);
+  }
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mChildManagers)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mSharedData)
+  tmp->mInitialProcessData.setNull();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsFrameMessageManager)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+
+  /* Message managers in child process implement nsIMessageSender.
+     Message managers in the chrome process are
+     either broadcasters (if they have subordinate/child message
+     managers) or they're simple message senders. */
+  NS_INTERFACE_MAP_ENTRY_CONDITIONAL(nsIMessageSender,
+                                     !mChrome || !mIsBroadcaster)
+
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsFrameMessageManager)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsFrameMessageManager)
+
+void MessageManagerCallback::DoGetRemoteType(nsACString& aRemoteType,
+                                             ErrorResult& aError) const {
+  aRemoteType.Truncate();
+  mozilla::dom::ProcessMessageManager* parent = GetProcessMessageManager();
+  if (!parent) {
+    return;
+  }
+
+  parent->GetRemoteType(aRemoteType, aError);
+}
+
+bool MessageManagerCallback::BuildClonedMessageDataForParent(
+    ContentParent* aParent, StructuredCloneData& aData,
+    ClonedMessageData& aClonedData) {
+  return aData.BuildClonedMessageDataForParent(aParent, aClonedData);
+}
+
+bool MessageManagerCallback::BuildClonedMessageDataForChild(
+    ContentChild* aChild, StructuredCloneData& aData,
+    ClonedMessageData& aClonedData) {
+  return aData.BuildClonedMessageDataForChild(aChild, aClonedData);
+}
+
+void mozilla::dom::ipc::UnpackClonedMessageDataForParent(
+    const ClonedMessageData& aClonedData, StructuredCloneData& aData) {
+  aData.BorrowFromClonedMessageDataForParent(aClonedData);
+}
+
+void mozilla::dom::ipc::UnpackClonedMessageDataForChild(
+    const ClonedMessageData& aClonedData, StructuredCloneData& aData) {
+  aData.BorrowFromClonedMessageDataForChild(aClonedData);
+}
+
+void nsFrameMessageManager::AddMessageListener(const nsAString& aMessageName,
+                                               MessageListener& aListener,
+                                               bool aListenWhenClosed,
+                                               ErrorResult& aError) {
+  auto& listeners = mListeners.LookupForAdd(aMessageName).OrInsert([]() {
+    return new nsAutoTObserverArray<nsMessageListenerInfo, 1>();
+  });
+  uint32_t len = listeners->Length();
+  for (uint32_t i = 0; i < len; ++i) {
+    MessageListener* strongListener = listeners->ElementAt(i).mStrongListener;
+    if (strongListener && *strongListener == aListener) {
+      return;
+    }
+  }
+
+  nsMessageListenerInfo* entry = listeners->AppendElement();
+  entry->mStrongListener = &aListener;
+  entry->mListenWhenClosed = aListenWhenClosed;
+}
+
+void nsFrameMessageManager::RemoveMessageListener(const nsAString& aMessageName,
+                                                  MessageListener& aListener,
+                                                  ErrorResult& aError) {
+  nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners =
+      mListeners.Get(aMessageName);
+  if (listeners) {
+    uint32_t len = listeners->Length();
+    for (uint32_t i = 0; i < len; ++i) {
+      MessageListener* strongListener = listeners->ElementAt(i).mStrongListener;
+      if (strongListener && *strongListener == aListener) {
+        listeners->RemoveElementAt(i);
+        return;
+      }
+    }
+  }
+}
+
+static already_AddRefed<nsISupports> ToXPCOMMessageListener(
+    MessageListener& aListener) {
+  return CallbackObjectHolder<mozilla::dom::MessageListener, nsISupports>(
+             &aListener)
+      .ToXPCOMCallback();
+}
+
+void nsFrameMessageManager::AddWeakMessageListener(
+    const nsAString& aMessageName, MessageListener& aListener,
+    ErrorResult& aError) {
+  nsCOMPtr<nsISupports> listener(ToXPCOMMessageListener(aListener));
+  nsWeakPtr weak = do_GetWeakReference(listener);
+  if (!weak) {
+    aError.Throw(NS_ERROR_NO_INTERFACE);
+    return;
+  }
+
+#ifdef DEBUG
+  // It's technically possible that one object X could give two different
+  // nsIWeakReference*'s when you do_GetWeakReference(X).  We really don't want
+  // this to happen; it will break e.g. RemoveWeakMessageListener.  So let's
+  // check that we're not getting ourselves into that situation.
+  nsCOMPtr<nsISupports> canonical = do_QueryInterface(listener);
+  for (auto iter = mListeners.Iter(); !iter.Done(); iter.Next()) {
+    nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners = iter.UserData();
+    uint32_t count = listeners->Length();
+    for (uint32_t i = 0; i < count; i++) {
+      nsWeakPtr weakListener = listeners->ElementAt(i).mWeakListener;
+      if (weakListener) {
+        nsCOMPtr<nsISupports> otherCanonical = do_QueryReferent(weakListener);
+        MOZ_ASSERT((canonical == otherCanonical) == (weak == weakListener));
+      }
+    }
+  }
+#endif
+
+  auto& listeners = mListeners.LookupForAdd(aMessageName).OrInsert([]() {
+    return new nsAutoTObserverArray<nsMessageListenerInfo, 1>();
+  });
+  uint32_t len = listeners->Length();
+  for (uint32_t i = 0; i < len; ++i) {
+    if (listeners->ElementAt(i).mWeakListener == weak) {
+      return;
+    }
+  }
+
+  nsMessageListenerInfo* entry = listeners->AppendElement();
+  entry->mWeakListener = weak;
+  entry->mListenWhenClosed = false;
+}
+
+void nsFrameMessageManager::RemoveWeakMessageListener(
+    const nsAString& aMessageName, MessageListener& aListener,
+    ErrorResult& aError) {
+  nsCOMPtr<nsISupports> listener(ToXPCOMMessageListener(aListener));
+  nsWeakPtr weak = do_GetWeakReference(listener);
+  if (!weak) {
+    aError.Throw(NS_ERROR_NO_INTERFACE);
+    return;
+  }
+
+  nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners =
+      mListeners.Get(aMessageName);
+  if (!listeners) {
+    return;
+  }
+
+  uint32_t len = listeners->Length();
+  for (uint32_t i = 0; i < len; ++i) {
+    if (listeners->ElementAt(i).mWeakListener == weak) {
+      listeners->RemoveElementAt(i);
+      return;
+    }
+  }
+}
+
+void nsFrameMessageManager::LoadScript(const nsAString& aURL,
+                                       bool aAllowDelayedLoad,
+                                       bool aRunInGlobalScope,
+                                       ErrorResult& aError) {
+  if (aAllowDelayedLoad) {
+    // Cache for future windows or frames
+    mPendingScripts.AppendElement(aURL);
+    mPendingScriptsGlobalStates.AppendElement(aRunInGlobalScope);
+  }
+
+  if (mCallback) {
+#ifdef DEBUG_smaug
+    printf("Will load %s \n", NS_ConvertUTF16toUTF8(aURL).get());
+#endif
+    if (!mCallback->DoLoadMessageManagerScript(aURL, aRunInGlobalScope)) {
+      aError.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+  }
+
+  for (uint32_t i = 0; i < mChildManagers.Length(); ++i) {
+    RefPtr<nsFrameMessageManager> mm = mChildManagers[i];
+    if (mm) {
+      // Use false here, so that child managers don't cache the script, which
+      // is already cached in the parent.
+      mm->LoadScript(aURL, false, aRunInGlobalScope, IgnoreErrors());
+    }
+  }
+}
+
+void nsFrameMessageManager::RemoveDelayedScript(const nsAString& aURL) {
+  for (uint32_t i = 0; i < mPendingScripts.Length(); ++i) {
+    if (mPendingScripts[i] == aURL) {
+      mPendingScripts.RemoveElementAt(i);
+      mPendingScriptsGlobalStates.RemoveElementAt(i);
+      break;
+    }
+  }
+}
+
+void nsFrameMessageManager::GetDelayedScripts(
+    JSContext* aCx, nsTArray<nsTArray<JS::Value>>& aList, ErrorResult& aError) {
+  // Frame message managers may return an incomplete list because scripts
+  // that were loaded after it was connected are not added to the list.
+  if (!IsGlobal() && !IsBroadcaster()) {
+    NS_WARNING(
+        "Cannot retrieve list of pending frame scripts for frame"
+        "message managers as it may be incomplete");
+    aError.Throw(NS_ERROR_NOT_IMPLEMENTED);
+    return;
+  }
+
+  aError.MightThrowJSException();
+
+  aList.SetCapacity(mPendingScripts.Length());
+  for (uint32_t i = 0; i < mPendingScripts.Length(); ++i) {
+    JS::Rooted<JS::Value> url(aCx);
+    if (!ToJSValue(aCx, mPendingScripts[i], &url)) {
+      aError.NoteJSContextException(aCx);
+      return;
+    }
+
+    nsTArray<JS::Value>* array = aList.AppendElement(2);
+    array->AppendElement(url);
+    array->AppendElement(JS::BooleanValue(mPendingScriptsGlobalStates[i]));
+  }
+}
+
+/* static */
+bool nsFrameMessageManager::GetParamsForMessage(JSContext* aCx,
+                                                const JS::Value& aValue,
+                                                const JS::Value& aTransfer,
+                                                StructuredCloneData& aData) {
+  // First try to use structured clone on the whole thing.
+  JS::RootedValue v(aCx, aValue);
+  JS::RootedValue t(aCx, aTransfer);
+  ErrorResult rv;
+  aData.Write(aCx, v, t, JS::CloneDataPolicy(), rv);
+  if (!rv.Failed()) {
+    return true;
+  }
+
+  rv.SuppressException();
+  JS_ClearPendingException(aCx);
+
+  nsCOMPtr<nsIConsoleService> console(
+      do_GetService(NS_CONSOLESERVICE_CONTRACTID));
+  if (console) {
+    nsAutoString filename;
+    uint32_t lineno = 0, column = 0;
+    nsJSUtils::GetCallingLocation(aCx, filename, &lineno, &column);
+    nsCOMPtr<nsIScriptError> error(
+        do_CreateInstance(NS_SCRIPTERROR_CONTRACTID));
+    error->Init(
+        u"Sending message that cannot be cloned. Are "
+        "you trying to send an XPCOM object?"_ns,
+        filename, u""_ns, lineno, column, nsIScriptError::warningFlag,
+        "chrome javascript", false /* from private window */,
+        true /* from chrome context */);
+    console->LogMessage(error);
+  }
+
+  // Not clonable, try JSON
+  // XXX This is ugly but currently structured cloning doesn't handle
+  //    properly cases when interface is implemented in JS and used
+  //    as a dictionary.
+  nsAutoString json;
+  NS_ENSURE_TRUE(nsContentUtils::StringifyJSON(aCx, &v, json), false);
+  NS_ENSURE_TRUE(!json.IsEmpty(), false);
+
+  JS::Rooted<JS::Value> val(aCx, JS::NullValue());
+  NS_ENSURE_TRUE(JS_ParseJSON(aCx, static_cast<const char16_t*>(json.get()),
+                              json.Length(), &val),
+                 false);
+
+  aData.Write(aCx, val, rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    rv.SuppressException();
+    return false;
+  }
+
+  return true;
+}
+
+static bool sSendingSyncMessage = false;
+
+static bool AllowMessage(size_t aDataLength, const nsAString& aMessageName) {
+  // A message includes more than structured clone data, so subtract
+  // 20KB to make it more likely that a message within this bound won't
+  // result in an overly large IPC message.
+  static const size_t kMaxMessageSize =
+      IPC::Channel::kMaximumMessageSize - 20 * 1024;
+  return aDataLength < kMaxMessageSize;
+}
+
+void nsFrameMessageManager::SendSyncMessage(JSContext* aCx,
+                                            const nsAString& aMessageName,
+                                            JS::Handle<JS::Value> aObj,
+                                            nsTArray<JS::Value>& aResult,
+                                            ErrorResult& aError) {
+  NS_ASSERTION(!IsGlobal(), "Should not call SendSyncMessage in chrome");
+  NS_ASSERTION(!IsBroadcaster(), "Should not call SendSyncMessage in chrome");
+  NS_ASSERTION(!GetParentManager(),
+               "Should not have parent manager in content!");
+
+  AUTO_PROFILER_LABEL_DYNAMIC_LOSSY_NSSTRING(
+      "nsFrameMessageManager::SendMessage", OTHER, aMessageName);
+
+  if (sSendingSyncMessage) {
+    // No kind of blocking send should be issued on top of a sync message.
+    aError.Throw(NS_ERROR_UNEXPECTED);
+    return;
+  }
+
+  StructuredCloneData data;
+  if (!aObj.isUndefined() &&
+      !GetParamsForMessage(aCx, aObj, JS::UndefinedHandleValue, data)) {
+    aError.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
+    return;
+  }
+
+#ifdef FUZZING
+  if (data.DataLength() > 0) {
+    MessageManagerFuzzer::TryMutate(aCx, aMessageName, &data,
+                                    JS::UndefinedHandleValue);
+  }
+#endif
+
+  if (!AllowMessage(data.DataLength(), aMessageName)) {
+    aError.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+
+  if (!mCallback) {
+    aError.Throw(NS_ERROR_NOT_INITIALIZED);
+    return;
+  }
+
+  nsTArray<StructuredCloneData> retval;
+
+  TimeStamp start = TimeStamp::Now();
+  sSendingSyncMessage = true;
+  bool ok = mCallback->DoSendBlockingMessage(aMessageName, data, &retval);
+  sSendingSyncMessage = false;
+
+  uint32_t latencyMs = round((TimeStamp::Now() - start).ToMilliseconds());
+  if (latencyMs >= kMinTelemetrySyncMessageManagerLatencyMs) {
+    NS_ConvertUTF16toUTF8 messageName(aMessageName);
+    // NOTE: We need to strip digit characters from the message name in order to
+    // avoid a large number of buckets due to generated names from addons (such
+    // as "ublock:sb:{N}"). See bug 1348113 comment 10.
+    messageName.StripTaggedASCII(ASCIIMask::Mask0to9());
+    Telemetry::Accumulate(Telemetry::IPC_SYNC_MESSAGE_MANAGER_LATENCY_MS,
+                          messageName, latencyMs);
+  }
+
+  if (!ok) {
+    return;
+  }
+
+  uint32_t len = retval.Length();
+  aResult.SetCapacity(len);
+  for (uint32_t i = 0; i < len; ++i) {
+    JS::Rooted<JS::Value> ret(aCx);
+    retval[i].Read(aCx, &ret, aError);
+    if (aError.Failed()) {
+      MOZ_ASSERT(false, "Unable to read structured clone in SendMessage");
+      return;
+    }
+    aResult.AppendElement(ret);
+  }
+}
+
+nsresult nsFrameMessageManager::DispatchAsyncMessageInternal(
+    JSContext* aCx, const nsAString& aMessage, StructuredCloneData& aData) {
+  if (mIsBroadcaster) {
+    uint32_t len = mChildManagers.Length();
+    for (uint32_t i = 0; i < len; ++i) {
+      mChildManagers[i]->DispatchAsyncMessageInternal(aCx, aMessage, aData);
+    }
+    return NS_OK;
+  }
+
+  if (!mCallback) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  nsresult rv = mCallback->DoSendAsyncMessage(aMessage, aData);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  return NS_OK;
+}
+
+void nsFrameMessageManager::DispatchAsyncMessage(
+    JSContext* aCx, const nsAString& aMessageName, JS::Handle<JS::Value> aObj,
+    JS::Handle<JS::Value> aTransfers, ErrorResult& aError) {
+  StructuredCloneData data;
+  if (!aObj.isUndefined() &&
+      !GetParamsForMessage(aCx, aObj, aTransfers, data)) {
+    aError.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
+    return;
+  }
+
+#ifdef FUZZING
+  if (data.DataLength()) {
+    MessageManagerFuzzer::TryMutate(aCx, aMessageName, &data, aTransfers);
+  }
+#endif
+
+  if (!AllowMessage(data.DataLength(), aMessageName)) {
+    aError.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+
+  aError = DispatchAsyncMessageInternal(aCx, aMessageName, data);
+}
+
+class MMListenerRemover {
+ public:
+  explicit MMListenerRemover(nsFrameMessageManager* aMM)
+      : mWasHandlingMessage(aMM->mHandlingMessage), mMM(aMM) {
+    mMM->mHandlingMessage = true;
+  }
+  ~MMListenerRemover() {
+    if (!mWasHandlingMessage) {
+      mMM->mHandlingMessage = false;
+      if (mMM->mDisconnected) {
+        mMM->mListeners.Clear();
+      }
+    }
+  }
+
+  bool mWasHandlingMessage;
+  RefPtr<nsFrameMessageManager> mMM;
+};
+
+void nsFrameMessageManager::ReceiveMessage(
+    nsISupports* aTarget, nsFrameLoader* aTargetFrameLoader, bool aTargetClosed,
+    const nsAString& aMessage, bool aIsSync, StructuredCloneData* aCloneData,
+    nsTArray<StructuredCloneData>* aRetVal, ErrorResult& aError) {
+  MOZ_ASSERT(aTarget);
+
+  nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners =
+      mListeners.Get(aMessage);
+  if (listeners) {
+    MMListenerRemover lr(this);
+
+    nsAutoTObserverArray<nsMessageListenerInfo, 1>::EndLimitedIterator iter(
+        *listeners);
+    while (iter.HasMore()) {
+      nsMessageListenerInfo& listener = iter.GetNext();
+      // Remove mListeners[i] if it's an expired weak listener.
+      nsCOMPtr<nsISupports> weakListener;
+      if (listener.mWeakListener) {
+        weakListener = do_QueryReferent(listener.mWeakListener);
+        if (!weakListener) {
+          iter.Remove();
+          continue;
+        }
+      }
+
+      if (!listener.mListenWhenClosed && aTargetClosed) {
+        continue;
+      }
+
+      JS::RootingContext* rcx = RootingCx();
+      JS::Rooted<JSObject*> object(rcx);
+      JS::Rooted<JSObject*> objectGlobal(rcx);
+
+      RefPtr<MessageListener> webIDLListener;
+      if (!weakListener) {
+        webIDLListener = listener.mStrongListener;
+        object = webIDLListener->CallbackOrNull();
+        objectGlobal = webIDLListener->CallbackGlobalOrNull();
+      } else {
+        nsCOMPtr<nsIXPConnectWrappedJS> wrappedJS =
+            do_QueryInterface(weakListener);
+        if (!wrappedJS) {
+          continue;
+        }
+
+        object = wrappedJS->GetJSObject();
+        objectGlobal = wrappedJS->GetJSObjectGlobal();
+      }
+
+      if (!object) {
+        continue;
+      }
+
+      AutoEntryScript aes(js::UncheckedUnwrap(object),
+                          "message manager handler");
+      JSContext* cx = aes.cx();
+
+      // We passed the unwrapped object to AutoEntryScript so we now need to
+      // enter the realm of the global object that represents the realm of our
+      // callback.
+      JSAutoRealm ar(cx, objectGlobal);
+
+      RootedDictionary<ReceiveMessageArgument> argument(cx);
+
+      JS::Rooted<JS::Value> json(cx, JS::NullValue());
+      if (aCloneData && aCloneData->DataLength()) {
+        aCloneData->Read(cx, &json, aError);
+        if (NS_WARN_IF(aError.Failed())) {
+          aError.SuppressException();
+          JS_ClearPendingException(cx);
+          return;
+        }
+      }
+      argument.mData = json;
+      argument.mJson = json;
+
+      // Get cloned MessagePort from StructuredCloneData.
+      if (aCloneData) {
+        Sequence<OwningNonNull<MessagePort>> ports;
+        if (!aCloneData->TakeTransferredPortsAsSequence(ports)) {
+          aError.Throw(NS_ERROR_FAILURE);
+          return;
+        }
+        argument.mPorts.Construct(std::move(ports));
+      }
+
+      argument.mName = aMessage;
+      argument.mSync = aIsSync;
+      argument.mTarget = aTarget;
+      if (aTargetFrameLoader) {
+        argument.mTargetFrameLoader.Construct(*aTargetFrameLoader);
+      }
+
+      JS::Rooted<JS::Value> thisValue(cx, JS::UndefinedValue());
+
+      if (JS::IsCallable(object)) {
+        // A small hack to get 'this' value right on content side where
+        // messageManager is wrapped in BrowserChildMessageManager's global.
+        nsCOMPtr<nsISupports> defaultThisValue;
+        if (mChrome) {
+          defaultThisValue = do_QueryObject(this);
+        } else {
+          defaultThisValue = aTarget;
+        }
+        js::AssertSameCompartment(cx, object);
+        aError = nsContentUtils::WrapNative(cx, defaultThisValue, &thisValue);
+        if (aError.Failed()) {
+          return;
+        }
+      }
+
+      JS::Rooted<JS::Value> rval(cx, JS::UndefinedValue());
+      if (webIDLListener) {
+        webIDLListener->ReceiveMessage(thisValue, argument, &rval, aError);
+        if (aError.Failed()) {
+          // At this point the call to ReceiveMessage will have reported any
+          // exceptions (we kept the default of eReportExceptions). We suppress
+          // the failure in the ErrorResult and continue.
+          aError.SuppressException();
+          continue;
+        }
+      } else {
+        JS::Rooted<JS::Value> funval(cx);
+        if (JS::IsCallable(object)) {
+          // If the listener is a JS function:
+          funval.setObject(*object);
+        } else {
+          // If the listener is a JS object which has receiveMessage function:
+          if (!JS_GetProperty(cx, object, "receiveMessage", &funval) ||
+              !funval.isObject()) {
+            aError.Throw(NS_ERROR_UNEXPECTED);
+            return;
+          }
+
+          // Check if the object is even callable.
+          if (!JS::IsCallable(&funval.toObject())) {
+            aError.Throw(NS_ERROR_UNEXPECTED);
+            return;
+          }
+          thisValue.setObject(*object);
+        }
+
+        JS::Rooted<JS::Value> argv(cx);
+        if (!ToJSValue(cx, argument, &argv)) {
+          aError.Throw(NS_ERROR_UNEXPECTED);
+          return;
+        }
+
+        {
+          JS::Rooted<JSObject*> thisObject(cx, thisValue.toObjectOrNull());
+          js::AssertSameCompartment(cx, thisObject);
+          if (!JS_CallFunctionValue(cx, thisObject, funval,
+                                    JS::HandleValueArray(argv), &rval)) {
+            // Because the AutoEntryScript is inside the loop this continue will
+            // make us report any exceptions (after which we'll move on to the
+            // next listener).
+            continue;
+          }
+        }
+      }
+
+      if (aRetVal) {
+        StructuredCloneData* data = aRetVal->AppendElement();
+        data->InitScope(JS::StructuredCloneScope::DifferentProcess);
+        data->Write(cx, rval, aError);
+        if (NS_WARN_IF(aError.Failed())) {
+          aRetVal->RemoveLastElement();
+          nsString msg =
+              aMessage + nsLiteralString(
+                             u": message reply cannot be cloned. Are "
+                             "you trying to send an XPCOM object?");
+
+          nsCOMPtr<nsIConsoleService> console(
+              do_GetService(NS_CONSOLESERVICE_CONTRACTID));
+          if (console) {
+            nsCOMPtr<nsIScriptError> error(
+                do_CreateInstance(NS_SCRIPTERROR_CONTRACTID));
+            error->Init(msg, u""_ns, u""_ns, 0, 0, nsIScriptError::warningFlag,
+                        "chrome javascript", false /* from private window */,
+                        true /* from chrome context */);
+            console->LogMessage(error);
+          }
+
+          JS_ClearPendingException(cx);
+          continue;
+        }
+      }
+    }
+  }
+
+  RefPtr<nsFrameMessageManager> kungFuDeathGrip = GetParentManager();
+  if (kungFuDeathGrip) {
+    kungFuDeathGrip->ReceiveMessage(aTarget, aTargetFrameLoader, aTargetClosed,
+                                    aMessage, aIsSync, aCloneData, aRetVal,
+                                    aError);
+  }
+}
+
+void nsFrameMessageManager::LoadPendingScripts(
+    nsFrameMessageManager* aManager, nsFrameMessageManager* aChildMM) {
+  // We have parent manager if we're a message broadcaster.
+  // In that case we want to load the pending scripts from all parent
+  // message managers in the hierarchy. Process the parent first so
+  // that pending scripts higher up in the hierarchy are loaded before others.
+  nsFrameMessageManager* parentManager = aManager->GetParentManager();
+  if (parentManager) {
+    LoadPendingScripts(parentManager, aChildMM);
+  }
+
+  for (uint32_t i = 0; i < aManager->mPendingScripts.Length(); ++i) {
+    aChildMM->LoadScript(aManager->mPendingScripts[i], false,
+                         aManager->mPendingScriptsGlobalStates[i],
+                         IgnoreErrors());
+  }
+}
+
+void nsFrameMessageManager::LoadPendingScripts() {
+  RefPtr<nsFrameMessageManager> kungfuDeathGrip = this;
+  LoadPendingScripts(this, this);
+}
+
+void nsFrameMessageManager::SetCallback(MessageManagerCallback* aCallback) {
+  MOZ_ASSERT(!mIsBroadcaster || !mCallback,
+             "Broadcasters cannot have callbacks!");
+  if (aCallback && mCallback != aCallback) {
+    mCallback = aCallback;
+    if (mOwnsCallback) {
+      mOwnedCallback = WrapUnique(aCallback);
+    }
+  }
+}
+
+void nsFrameMessageManager::Close() {
+  if (!mClosed) {
+    if (nsCOMPtr<nsIObserverService> obs =
+            mozilla::services::GetObserverService()) {
+      obs->NotifyWhenScriptSafe(this, "message-manager-close", nullptr);
+    }
+  }
+  mClosed = true;
+  mCallback = nullptr;
+  mOwnedCallback = nullptr;
+}
+
+void nsFrameMessageManager::Disconnect(bool aRemoveFromParent) {
+  // Notify message-manager-close if we haven't already.
+  Close();
+
+  if (!mDisconnected) {
+    if (nsCOMPtr<nsIObserverService> obs =
+            mozilla::services::GetObserverService()) {
+      obs->NotifyWhenScriptSafe(this, "message-manager-disconnect", nullptr);
+    }
+  }
+
+  ClearParentManager(aRemoveFromParent);
+
+  mDisconnected = true;
+  if (!mHandlingMessage) {
+    mListeners.Clear();
+  }
+}
+
+void nsFrameMessageManager::SetInitialProcessData(
+    JS::HandleValue aInitialData) {
+  MOZ_ASSERT(!mChrome);
+  MOZ_ASSERT(mIsProcessManager);
+  MOZ_ASSERT(aInitialData.isObject());
+  mInitialProcessData = aInitialData;
+}
+
+void nsFrameMessageManager::GetInitialProcessData(
+    JSContext* aCx, JS::MutableHandle<JS::Value> aInitialProcessData,
+    ErrorResult& aError) {
+  MOZ_ASSERT(mIsProcessManager);
+  MOZ_ASSERT_IF(mChrome, IsBroadcaster());
+
+  JS::RootedValue init(aCx, mInitialProcessData);
+  if (mChrome && init.isUndefined()) {
+    // We create the initial object in the junk scope. If we created it in a
+    // normal realm, that realm would leak until shutdown.
+    JS::RootedObject global(aCx, xpc::PrivilegedJunkScope());
+    JSAutoRealm ar(aCx, global);
+
+    JS::RootedObject obj(aCx, JS_NewPlainObject(aCx));
+    if (!obj) {
+      aError.NoteJSContextException(aCx);
+      return;
+    }
+
+    mInitialProcessData.setObject(*obj);
+    init.setObject(*obj);
+  }
+
+  if (!mChrome && XRE_IsParentProcess()) {
+    // This is the cpmm in the parent process. We should use the same object as
+    // the ppmm. Create it first through do_GetService and use the cached
+    // pointer in sParentProcessManager.
+    nsCOMPtr<nsISupports> ppmm =
+        do_GetService("@mozilla.org/parentprocessmessagemanager;1");
+    sParentProcessManager->GetInitialProcessData(aCx, &init, aError);
+    if (aError.Failed()) {
+      return;
+    }
+    mInitialProcessData = init;
+  }
+
+  if (!JS_WrapValue(aCx, &init)) {
+    aError.NoteJSContextException(aCx);
+    return;
+  }
+  aInitialProcessData.set(init);
+}
+
+WritableSharedMap* nsFrameMessageManager::SharedData() {
+  if (!mChrome || !mIsProcessManager) {
+    MOZ_ASSERT(false, "Should only call this binding method on ppmm");
+    return nullptr;
+  }
+  if (!mSharedData) {
+    mSharedData = new WritableSharedMap();
+  }
+  return mSharedData;
+}
+
+already_AddRefed<ProcessMessageManager>
+nsFrameMessageManager::GetProcessMessageManager(ErrorResult& aError) {
+  RefPtr<ProcessMessageManager> pmm;
+  if (mCallback) {
+    pmm = mCallback->GetProcessMessageManager();
+  }
+  return pmm.forget();
+}
+
+void nsFrameMessageManager::GetRemoteType(nsACString& aRemoteType,
+                                          ErrorResult& aError) const {
+  aRemoteType.Truncate();
+  if (mCallback) {
+    mCallback->DoGetRemoteType(aRemoteType, aError);
+  }
+}
+
+namespace {
+
+struct MessageManagerReferentCount {
+  MessageManagerReferentCount() : mStrong(0), mWeakAlive(0), mWeakDead(0) {}
+  size_t mStrong;
+  size_t mWeakAlive;
+  size_t mWeakDead;
+  nsTArray<nsString> mSuspectMessages;
+  nsDataHashtable<nsStringHashKey, uint32_t> mMessageCounter;
+};
+
+}  // namespace
+
+namespace mozilla::dom {
+
+class MessageManagerReporter final : public nsIMemoryReporter {
+  ~MessageManagerReporter() = default;
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMEMORYREPORTER
+
+  static const size_t kSuspectReferentCount = 300;
+
+ protected:
+  void CountReferents(nsFrameMessageManager* aMessageManager,
+                      MessageManagerReferentCount* aReferentCount);
+};
+
+NS_IMPL_ISUPPORTS(MessageManagerReporter, nsIMemoryReporter)
+
+void MessageManagerReporter::CountReferents(
+    nsFrameMessageManager* aMessageManager,
+    MessageManagerReferentCount* aReferentCount) {
+  for (auto it = aMessageManager->mListeners.Iter(); !it.Done(); it.Next()) {
+    nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners = it.UserData();
+    uint32_t listenerCount = listeners->Length();
+    if (listenerCount == 0) {
+      continue;
+    }
+
+    nsString key(it.Key());
+    uint32_t oldCount = 0;
+    aReferentCount->mMessageCounter.Get(key, &oldCount);
+    uint32_t currentCount = oldCount + listenerCount;
+    aReferentCount->mMessageCounter.Put(key, currentCount);
+
+    // Keep track of messages that have a suspiciously large
+    // number of referents (symptom of leak).
+    if (currentCount >= MessageManagerReporter::kSuspectReferentCount) {
+      aReferentCount->mSuspectMessages.AppendElement(key);
+    }
+
+    for (uint32_t i = 0; i < listenerCount; ++i) {
+      const nsMessageListenerInfo& listenerInfo = listeners->ElementAt(i);
+      if (listenerInfo.mWeakListener) {
+        nsCOMPtr<nsISupports> referent =
+            do_QueryReferent(listenerInfo.mWeakListener);
+        if (referent) {
+          aReferentCount->mWeakAlive++;
+        } else {
+          aReferentCount->mWeakDead++;
+        }
+      } else {
+        aReferentCount->mStrong++;
+      }
+    }
+  }
+
+  // Add referent count in child managers because the listeners
+  // participate in messages dispatched from parent message manager.
+  for (uint32_t i = 0; i < aMessageManager->mChildManagers.Length(); ++i) {
+    RefPtr<nsFrameMessageManager> mm = aMessageManager->mChildManagers[i];
+    CountReferents(mm, aReferentCount);
+  }
+}
+
+static void ReportReferentCount(
+    const char* aManagerType, const MessageManagerReferentCount& aReferentCount,
+    nsIHandleReportCallback* aHandleReport, nsISupports* aData) {
+#define REPORT(_path, _amount, _desc)                                       \
+  do {                                                                      \
+    aHandleReport->Callback(""_ns, _path, nsIMemoryReporter::KIND_OTHER,    \
+                            nsIMemoryReporter::UNITS_COUNT, _amount, _desc, \
+                            aData);                                         \
+  } while (0)
+
+  REPORT(nsPrintfCString("message-manager/referent/%s/strong", aManagerType),
+         aReferentCount.mStrong,
+         nsPrintfCString("The number of strong referents held by the message "
+                         "manager in the %s manager.",
+                         aManagerType));
+  REPORT(
+      nsPrintfCString("message-manager/referent/%s/weak/alive", aManagerType),
+      aReferentCount.mWeakAlive,
+      nsPrintfCString("The number of weak referents that are still alive "
+                      "held by the message manager in the %s manager.",
+                      aManagerType));
+  REPORT(nsPrintfCString("message-manager/referent/%s/weak/dead", aManagerType),
+         aReferentCount.mWeakDead,
+         nsPrintfCString("The number of weak referents that are dead "
+                         "held by the message manager in the %s manager.",
+                         aManagerType));
+
+  for (uint32_t i = 0; i < aReferentCount.mSuspectMessages.Length(); i++) {
+    uint32_t totalReferentCount = 0;
+    aReferentCount.mMessageCounter.Get(aReferentCount.mSuspectMessages[i],
+                                       &totalReferentCount);
+    NS_ConvertUTF16toUTF8 suspect(aReferentCount.mSuspectMessages[i]);
+    REPORT(nsPrintfCString("message-manager-suspect/%s/referent(message=%s)",
+                           aManagerType, suspect.get()),
+           totalReferentCount,
+           nsPrintfCString("A message in the %s message manager with a "
+                           "suspiciously large number of referents (symptom "
+                           "of a leak).",
+                           aManagerType));
+  }
+
+#undef REPORT
+}
+
+static StaticRefPtr<ChromeMessageBroadcaster> sGlobalMessageManager;
+
+NS_IMETHODIMP
+MessageManagerReporter::CollectReports(nsIHandleReportCallback* aHandleReport,
+                                       nsISupports* aData, bool aAnonymize) {
+  if (XRE_IsParentProcess() && sGlobalMessageManager) {
+    MessageManagerReferentCount count;
+    CountReferents(sGlobalMessageManager, &count);
+    ReportReferentCount("global-manager", count, aHandleReport, aData);
+  }
+
+  if (nsFrameMessageManager::sParentProcessManager) {
+    MessageManagerReferentCount count;
+    CountReferents(nsFrameMessageManager::sParentProcessManager, &count);
+    ReportReferentCount("parent-process-manager", count, aHandleReport, aData);
+  }
+
+  if (nsFrameMessageManager::sChildProcessManager) {
+    MessageManagerReferentCount count;
+    CountReferents(nsFrameMessageManager::sChildProcessManager, &count);
+    ReportReferentCount("child-process-manager", count, aHandleReport, aData);
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla::dom
+
+already_AddRefed<ChromeMessageBroadcaster>
+nsFrameMessageManager::GetGlobalMessageManager() {
+  RefPtr<ChromeMessageBroadcaster> mm;
+  if (sGlobalMessageManager) {
+    mm = sGlobalMessageManager;
+  } else {
+    sGlobalMessageManager = mm =
+        new ChromeMessageBroadcaster(MessageManagerFlags::MM_GLOBAL);
+    ClearOnShutdown(&sGlobalMessageManager);
+    RegisterStrongMemoryReporter(new MessageManagerReporter());
+  }
+  return mm.forget();
+}
+
+nsresult NS_NewGlobalMessageManager(nsISupports** aResult) {
+  *aResult = nsFrameMessageManager::GetGlobalMessageManager().take();
+  return NS_OK;
+}
+
+nsDataHashtable<nsStringHashKey, nsMessageManagerScriptHolder*>*
+    nsMessageManagerScriptExecutor::sCachedScripts = nullptr;
+StaticRefPtr<nsScriptCacheCleaner>
+    nsMessageManagerScriptExecutor::sScriptCacheCleaner;
+
+void nsMessageManagerScriptExecutor::DidCreateScriptLoader() {
+  if (!sCachedScripts) {
+    sCachedScripts =
+        new nsDataHashtable<nsStringHashKey, nsMessageManagerScriptHolder*>;
+    sScriptCacheCleaner = new nsScriptCacheCleaner();
+  }
+}
+
+// static
+void nsMessageManagerScriptExecutor::PurgeCache() {
+  if (sCachedScripts) {
+    NS_ASSERTION(sCachedScripts != nullptr, "Need cached scripts");
+    for (auto iter = sCachedScripts->Iter(); !iter.Done(); iter.Next()) {
+      delete iter.Data();
+      iter.Remove();
+    }
+  }
+}
+
+// static
+void nsMessageManagerScriptExecutor::Shutdown() {
+  if (sCachedScripts) {
+    PurgeCache();
+
+    delete sCachedScripts;
+    sCachedScripts = nullptr;
+    sScriptCacheCleaner = nullptr;
+  }
+}
+
+void nsMessageManagerScriptExecutor::LoadScriptInternal(
+    JS::Handle<JSObject*> aMessageManager, const nsAString& aURL,
+    bool aRunInUniqueScope) {
+  AUTO_PROFILER_LABEL_DYNAMIC_LOSSY_NSSTRING(
+      "nsMessageManagerScriptExecutor::LoadScriptInternal", OTHER, aURL);
+
+  if (!sCachedScripts) {
+    return;
+  }
+
+  JS::RootingContext* rcx = RootingCx();
+  JS::Rooted<JSScript*> script(rcx);
+
+  nsMessageManagerScriptHolder* holder = sCachedScripts->Get(aURL);
+  if (holder) {
+    script = holder->mScript;
+  } else {
+    TryCacheLoadAndCompileScript(aURL, aRunInUniqueScope, true, aMessageManager,
+                                 &script);
+  }
+
+  AutoEntryScript aes(aMessageManager, "message manager script load");
+  JSContext* cx = aes.cx();
+  if (script) {
+    if (aRunInUniqueScope) {
+      JS::Rooted<JSObject*> scope(cx);
+      bool ok = js::ExecuteInFrameScriptEnvironment(cx, aMessageManager, script,
+                                                    &scope);
+      if (ok) {
+        // Force the scope to stay alive.
+        mAnonymousGlobalScopes.AppendElement(scope);
+      }
+    } else {
+      JS::RootedValue rval(cx);
+      JS::RootedVector<JSObject*> envChain(cx);
+      if (!envChain.append(aMessageManager)) {
+        return;
+      }
+      JS::CloneAndExecuteScript(cx, envChain, script, &rval);
+    }
+  }
+}
+
+void nsMessageManagerScriptExecutor::TryCacheLoadAndCompileScript(
+    const nsAString& aURL, bool aRunInUniqueScope, bool aShouldCache,
+    JS::Handle<JSObject*> aMessageManager,
+    JS::MutableHandle<JSScript*> aScriptp) {
+  nsCString url = NS_ConvertUTF16toUTF8(aURL);
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), url);
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+  bool hasFlags;
+  rv = NS_URIChainHasFlags(uri, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
+                           &hasFlags);
+  if (NS_FAILED(rv) || !hasFlags) {
+    NS_WARNING("Will not load a frame script!");
+    return;
+  }
+
+  // If this script won't be cached, or there is only one of this type of
+  // message manager per process, treat this script as run-once. Run-once
+  // scripts can be compiled directly for the target global, and will be dropped
+  // from the preloader cache after they're executed and serialized.
+  bool isRunOnce = !aShouldCache || IsProcessScoped();
+
+  // If the script will be reused in this session, compile it in the compilation
+  // scope instead of the current global to avoid keeping the current
+  // compartment alive.
+  AutoJSAPI jsapi;
+  if (!jsapi.Init(isRunOnce ? aMessageManager : xpc::CompilationScope())) {
+    return;
+  }
+  JSContext* cx = jsapi.cx();
+
+  JS::CompileOptions options(cx);
+  ScriptPreloader::FillCompileOptionsForCachedScript(options);
+  options.setFileAndLine(url.get(), 1);
+  options.setNonSyntacticScope(true);
+
+  JS::Rooted<JSScript*> script(cx);
+  script =
+      ScriptPreloader::GetChildSingleton().GetCachedScript(cx, options, url);
+
+  if (!script) {
+    nsCOMPtr<nsIChannel> channel;
+    NS_NewChannel(getter_AddRefs(channel), uri,
+                  nsContentUtils::GetSystemPrincipal(),
+                  nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_SEC_CONTEXT_IS_NULL,
+                  nsIContentPolicy::TYPE_INTERNAL_FRAME_MESSAGEMANAGER_SCRIPT);
+
+    if (!channel) {
+      return;
+    }
+
+    nsCOMPtr<nsIInputStream> input;
+    rv = channel->Open(getter_AddRefs(input));
+    NS_ENSURE_SUCCESS_VOID(rv);
+    nsString dataString;
+    char16_t* dataStringBuf = nullptr;
+    size_t dataStringLength = 0;
+    if (input) {
+      nsCString buffer;
+      uint64_t written;
+      if (NS_FAILED(NS_ReadInputStreamToString(input, buffer, -1, &written))) {
+        return;
+      }
+
+      uint32_t size = (uint32_t)std::min(written, (uint64_t)UINT32_MAX);
+      ScriptLoader::ConvertToUTF16(channel, (uint8_t*)buffer.get(), size,
+                                   u""_ns, nullptr, dataStringBuf,
+                                   dataStringLength);
+    }
+
+    if (!dataStringBuf || dataStringLength == 0) {
+      return;
+    }
+
+    JS::UniqueTwoByteChars srcChars(dataStringBuf);
+
+    JS::SourceText<char16_t> srcBuf;
+    if (!srcBuf.init(cx, std::move(srcChars), dataStringLength)) {
+      return;
+    }
+
+    script = JS::Compile(cx, options, srcBuf);
+    if (!script) {
+      return;
+    }
+  }
+
+  MOZ_ASSERT(script);
+  aScriptp.set(script);
+
+  nsAutoCString scheme;
+  uri->GetScheme(scheme);
+  // We don't cache data: scripts!
+  if (aShouldCache && !scheme.EqualsLiteral("data")) {
+    ScriptPreloader::GetChildSingleton().NoteScript(url, url, script,
+                                                    isRunOnce);
+
+    // If this script will only run once per process, only cache it in the
+    // preloader cache, not the session cache.
+    if (!isRunOnce) {
+      // Root the object also for caching.
+      auto* holder = new nsMessageManagerScriptHolder(cx, script);
+      sCachedScripts->Put(aURL, holder);
+    }
+  }
+}
+
+void nsMessageManagerScriptExecutor::Trace(const TraceCallbacks& aCallbacks,
+                                           void* aClosure) {
+  for (size_t i = 0, length = mAnonymousGlobalScopes.Length(); i < length;
+       ++i) {
+    aCallbacks.Trace(&mAnonymousGlobalScopes[i], "mAnonymousGlobalScopes[i]",
+                     aClosure);
+  }
+}
+
+void nsMessageManagerScriptExecutor::Unlink() {
+  ImplCycleCollectionUnlink(mAnonymousGlobalScopes);
+}
+
+bool nsMessageManagerScriptExecutor::Init() {
+  DidCreateScriptLoader();
+  return true;
+}
+
+void nsMessageManagerScriptExecutor::MarkScopesForCC() {
+  for (uint32_t i = 0; i < mAnonymousGlobalScopes.Length(); ++i) {
+    mAnonymousGlobalScopes[i].exposeToActiveJS();
+  }
+}
+
+NS_IMPL_ISUPPORTS(nsScriptCacheCleaner, nsIObserver)
+
+ChildProcessMessageManager* nsFrameMessageManager::sChildProcessManager =
+    nullptr;
+ParentProcessMessageManager* nsFrameMessageManager::sParentProcessManager =
+    nullptr;
+nsFrameMessageManager* nsFrameMessageManager::sSameProcessParentManager =
+    nullptr;
+
+class nsAsyncMessageToSameProcessChild : public nsSameProcessAsyncMessageBase,
+                                         public Runnable {
+ public:
+  nsAsyncMessageToSameProcessChild()
+      : nsSameProcessAsyncMessageBase(),
+        mozilla::Runnable("nsAsyncMessageToSameProcessChild") {}
+  NS_IMETHOD Run() override {
+    nsFrameMessageManager* ppm =
+        nsFrameMessageManager::GetChildProcessManager();
+    ReceiveMessage(ppm, nullptr, ppm);
+    return NS_OK;
+  }
+};
+
+/**
+ * Send messages to an imaginary child process in a single-process scenario.
+ */
+class SameParentProcessMessageManagerCallback : public MessageManagerCallback {
+ public:
+  SameParentProcessMessageManagerCallback() {
+    MOZ_COUNT_CTOR(SameParentProcessMessageManagerCallback);
+  }
+  ~SameParentProcessMessageManagerCallback() override {
+    MOZ_COUNT_DTOR(SameParentProcessMessageManagerCallback);
+  }
+
+  bool DoLoadMessageManagerScript(const nsAString& aURL,
+                                  bool aRunInGlobalScope) override {
+    auto* global = ContentProcessMessageManager::Get();
+    MOZ_ASSERT(!aRunInGlobalScope);
+    global->LoadScript(aURL);
+    return true;
+  }
+
+  nsresult DoSendAsyncMessage(const nsAString& aMessage,
+                              StructuredCloneData& aData) override {
+    RefPtr<nsAsyncMessageToSameProcessChild> ev =
+        new nsAsyncMessageToSameProcessChild();
+
+    nsresult rv = ev->Init(aMessage, aData);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    rv = NS_DispatchToCurrentThread(ev);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    return NS_OK;
+  }
+};
+
+/**
+ * Send messages to the parent process.
+ */
+class ChildProcessMessageManagerCallback : public MessageManagerCallback {
+ public:
+  ChildProcessMessageManagerCallback() {
+    MOZ_COUNT_CTOR(ChildProcessMessageManagerCallback);
+  }
+  ~ChildProcessMessageManagerCallback() override {
+    MOZ_COUNT_DTOR(ChildProcessMessageManagerCallback);
+  }
+
+  bool DoSendBlockingMessage(const nsAString& aMessage,
+                             StructuredCloneData& aData,
+                             nsTArray<StructuredCloneData>* aRetVal) override {
+    mozilla::dom::ContentChild* cc = mozilla::dom::ContentChild::GetSingleton();
+    if (!cc) {
+      return true;
+    }
+    ClonedMessageData data;
+    if (!BuildClonedMessageDataForChild(cc, aData, data)) {
+      return false;
+    }
+    return cc->SendSyncMessage(PromiseFlatString(aMessage), data, aRetVal);
+  }
+
+  nsresult DoSendAsyncMessage(const nsAString& aMessage,
+                              StructuredCloneData& aData) override {
+    mozilla::dom::ContentChild* cc = mozilla::dom::ContentChild::GetSingleton();
+    if (!cc) {
+      return NS_OK;
+    }
+    ClonedMessageData data;
+    if (!BuildClonedMessageDataForChild(cc, aData, data)) {
+      return NS_ERROR_DOM_DATA_CLONE_ERR;
+    }
+    if (!cc->SendAsyncMessage(PromiseFlatString(aMessage), data)) {
+      return NS_ERROR_UNEXPECTED;
+    }
+
+    return NS_OK;
+  }
+};
+
+class nsAsyncMessageToSameProcessParent
+    : public nsSameProcessAsyncMessageBase,
+      public SameProcessMessageQueue::Runnable {
+ public:
+  nsAsyncMessageToSameProcessParent() : nsSameProcessAsyncMessageBase() {}
+  nsresult HandleMessage() override {
+    nsFrameMessageManager* ppm =
+        nsFrameMessageManager::sSameProcessParentManager;
+    ReceiveMessage(ppm, nullptr, ppm);
+    return NS_OK;
+  }
+};
+
+/**
+ * Send messages to the imaginary parent process in a single-process scenario.
+ */
+class SameChildProcessMessageManagerCallback : public MessageManagerCallback {
+ public:
+  SameChildProcessMessageManagerCallback() {
+    MOZ_COUNT_CTOR(SameChildProcessMessageManagerCallback);
+  }
+  ~SameChildProcessMessageManagerCallback() override {
+    MOZ_COUNT_DTOR(SameChildProcessMessageManagerCallback);
+  }
+
+  bool DoSendBlockingMessage(const nsAString& aMessage,
+                             StructuredCloneData& aData,
+                             nsTArray<StructuredCloneData>* aRetVal) override {
+    SameProcessMessageQueue* queue = SameProcessMessageQueue::Get();
+    queue->Flush();
+
+    if (nsFrameMessageManager::sSameProcessParentManager) {
+      RefPtr<nsFrameMessageManager> ppm =
+          nsFrameMessageManager::sSameProcessParentManager;
+      ppm->ReceiveMessage(ppm, nullptr, aMessage, true, &aData, aRetVal,
+                          IgnoreErrors());
+    }
+    return true;
+  }
+
+  nsresult DoSendAsyncMessage(const nsAString& aMessage,
+                              StructuredCloneData& aData) override {
+    SameProcessMessageQueue* queue = SameProcessMessageQueue::Get();
+    RefPtr<nsAsyncMessageToSameProcessParent> ev =
+        new nsAsyncMessageToSameProcessParent();
+    nsresult rv = ev->Init(aMessage, aData);
+
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    queue->Push(ev);
+    return NS_OK;
+  }
+};
+
+// This creates the global parent process message manager.
+nsresult NS_NewParentProcessMessageManager(nsISupports** aResult) {
+  NS_ASSERTION(!nsFrameMessageManager::sParentProcessManager,
+               "Re-creating sParentProcessManager");
+  RefPtr<ParentProcessMessageManager> mm = new ParentProcessMessageManager();
+  nsFrameMessageManager::sParentProcessManager = mm;
+  nsFrameMessageManager::NewProcessMessageManager(
+      false);  // Create same process message manager.
+  mm.forget(aResult);
+  return NS_OK;
+}
+
+ProcessMessageManager* nsFrameMessageManager::NewProcessMessageManager(
+    bool aIsRemote) {
+  if (!nsFrameMessageManager::sParentProcessManager) {
+    nsCOMPtr<nsISupports> dummy =
+        do_GetService("@mozilla.org/parentprocessmessagemanager;1");
+  }
+
+  MOZ_ASSERT(nsFrameMessageManager::sParentProcessManager,
+             "parent process manager not created");
+  ProcessMessageManager* mm;
+  if (aIsRemote) {
+    // Callback is set in ContentParent::InitInternal so that the process has
+    // already started when we send pending scripts.
+    mm = new ProcessMessageManager(
+        nullptr, nsFrameMessageManager::sParentProcessManager);
+  } else {
+    mm =
+        new ProcessMessageManager(new SameParentProcessMessageManagerCallback(),
+                                  nsFrameMessageManager::sParentProcessManager,
+                                  MessageManagerFlags::MM_OWNSCALLBACK);
+    mm->SetOsPid(base::GetCurrentProcId());
+    sSameProcessParentManager = mm;
+  }
+  return mm;
+}
+
+nsresult NS_NewChildProcessMessageManager(nsISupports** aResult) {
+  NS_ASSERTION(!nsFrameMessageManager::GetChildProcessManager(),
+               "Re-creating sChildProcessManager");
+
+  MessageManagerCallback* cb;
+  if (XRE_IsParentProcess()) {
+    cb = new SameChildProcessMessageManagerCallback();
+  } else {
+    cb = new ChildProcessMessageManagerCallback();
+    RegisterStrongMemoryReporter(new MessageManagerReporter());
+  }
+  auto* mm = new ChildProcessMessageManager(cb);
+  nsFrameMessageManager::SetChildProcessManager(mm);
+  auto global = MakeRefPtr<ContentProcessMessageManager>(mm);
+  NS_ENSURE_TRUE(global->Init(), NS_ERROR_UNEXPECTED);
+  return CallQueryInterface(global, aResult);
+}
+
+void nsFrameMessageManager::MarkForCC() {
+  for (auto iter = mListeners.Iter(); !iter.Done(); iter.Next()) {
+    nsAutoTObserverArray<nsMessageListenerInfo, 1>* listeners = iter.UserData();
+    uint32_t count = listeners->Length();
+    for (uint32_t i = 0; i < count; i++) {
+      MessageListener* strongListener = listeners->ElementAt(i).mStrongListener;
+      if (strongListener) {
+        strongListener->MarkForCC();
+      }
+    }
+  }
+
+  if (mRefCnt.IsPurple()) {
+    mRefCnt.RemovePurple();
+  }
+}
+
+nsSameProcessAsyncMessageBase::nsSameProcessAsyncMessageBase()
+#ifdef DEBUG
+    : mCalledInit(false)
+#endif
+{
+}
+
+nsresult nsSameProcessAsyncMessageBase::Init(const nsAString& aMessage,
+                                             StructuredCloneData& aData) {
+  if (!mData.Copy(aData)) {
+    Telemetry::Accumulate(Telemetry::IPC_SAME_PROCESS_MESSAGE_COPY_OOM_KB,
+                          aData.DataLength());
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  mMessage = aMessage;
+#ifdef DEBUG
+  mCalledInit = true;
+#endif
+
+  return NS_OK;
+}
+
+void nsSameProcessAsyncMessageBase::ReceiveMessage(
+    nsISupports* aTarget, nsFrameLoader* aTargetFrameLoader,
+    nsFrameMessageManager* aManager) {
+  // Make sure that we have called Init() and it has succeeded.
+  MOZ_ASSERT(mCalledInit);
+  if (aManager) {
+    RefPtr<nsFrameMessageManager> mm = aManager;
+    mm->ReceiveMessage(aTarget, aTargetFrameLoader, mMessage, false, &mData,
+                       nullptr, IgnoreErrors());
+  }
+}