Issue #1603 - Part 1: Reorganize ScriptLoader/ScriptElement

- Moves scripting parts of DOM into 'dom/script' - Renames nsScript{Loader/Element} to Script{Loader/Element} - Adjusts all callers
author: Moonchild <moonchild@palemoon.org> 2020-06-30 11:32:07 +0000
committer: Moonchild <moonchild@palemoon.org> 2020-07-10 18:28:50 +0000
commit: 0633844f46858135ee62d396829c6292492ca117 (patch)
tree: 051f8c4a50ab5c955f5d4e70e4de0ea50151758e /dom/base
parent: d0126b96cd6527e6dc89530b333fb0c196aba30d (diff)
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22 files changed, 30 insertions, 5695 deletions
diff --git a/dom/base/ImportManager.cpp b/dom/base/ImportManager.cpp
index d0e514b59..1f4d376b3 100644
--- a/dom/base/ImportManager.cpp
+++ b/dom/base/ImportManager.cpp
@@ -6,6 +6,7 @@
 
 #include "ImportManager.h"
 
+#include "mozilla/dom/ScriptLoader.h"
 #include "mozilla/EventListenerManager.h"
 #include "HTMLLinkElement.h"
 #include "nsContentPolicyUtils.h"
@@ -18,7 +19,6 @@
 #include "nsIDOMEvent.h"
 #include "nsIPrincipal.h"
 #include "nsIScriptObjectPrincipal.h"
-#include "nsScriptLoader.h"
 #include "nsNetUtil.h"
 
 //-----------------------------------------------------------------------------
@@ -156,7 +156,7 @@ ImportLoader::Updater::UpdateMainReferrer(uint32_t aNewIdx)
     // Our nearest predecessor has changed. So let's add the ScriptLoader to the
     // new one if there is any. And remove it from the old one.
     RefPtr<ImportManager> manager = mLoader->Manager();
-    nsScriptLoader* loader = mLoader->mDocument->ScriptLoader();
+    ScriptLoader* loader = mLoader->mDocument->ScriptLoader();
     ImportLoader*& pred = mLoader->mBlockingPredecessor;
     ImportLoader* newPred = manager->GetNearestPredecessor(newMainReferrer);
     if (pred) {
@@ -339,7 +339,7 @@ ImportLoader::DispatchEventIfFinished(nsINode* aNode)
 }
 
 void
-ImportLoader::AddBlockedScriptLoader(nsScriptLoader* aScriptLoader)
+ImportLoader::AddBlockedScriptLoader(ScriptLoader* aScriptLoader)
 {
   if (mBlockedScriptLoaders.Contains(aScriptLoader)) {
     return;
@@ -352,7 +352,7 @@ ImportLoader::AddBlockedScriptLoader(nsScriptLoader* aScriptLoader)
 }
 
 bool
-ImportLoader::RemoveBlockedScriptLoader(nsScriptLoader* aScriptLoader)
+ImportLoader::RemoveBlockedScriptLoader(ScriptLoader* aScriptLoader)
 {
   aScriptLoader->RemoveParserBlockingScriptExecutionBlocker();
   return mBlockedScriptLoaders.RemoveElement(aScriptLoader);
diff --git a/dom/base/ImportManager.h b/dom/base/ImportManager.h
index 258d4691c..ccc00125a 100644
--- a/dom/base/ImportManager.h
+++ b/dom/base/ImportManager.h
@@ -45,8 +45,8 @@
 #include "nsIStreamListener.h"
 #include "nsIWeakReferenceUtils.h"
 #include "nsRefPtrHashtable.h"
-#include "nsScriptLoader.h"
 #include "nsURIHashKey.h"
+#include "mozilla/dom/ScriptLoader.h"
 
 class nsIDocument;
 class nsIPrincipal;
@@ -184,8 +184,8 @@ public:
   // and wait for that to run its scripts. We keep track of all the
   // ScriptRunners that are waiting for this import. NOTE: updating
   // the main referrer might change this list.
-  void AddBlockedScriptLoader(nsScriptLoader* aScriptLoader);
-  bool RemoveBlockedScriptLoader(nsScriptLoader* aScriptLoader);
+  void AddBlockedScriptLoader(ScriptLoader* aScriptLoader);
+  bool RemoveBlockedScriptLoader(ScriptLoader* aScriptLoader);
   void SetBlockingPredecessor(ImportLoader* aLoader);
 
 private:
@@ -230,7 +230,7 @@ private:
 
   // List of pending ScriptLoaders that are waiting for this import
   // to finish.
-  nsTArray<RefPtr<nsScriptLoader>> mBlockedScriptLoaders;
+  nsTArray<RefPtr<ScriptLoader>> mBlockedScriptLoaders;
 
   // There is always exactly one referrer link that is flagged as
   // the main referrer the primary link. This is the one that is
diff --git a/dom/base/Location.cpp b/dom/base/Location.cpp
index 1483c32f9..308e9a4ff 100644
--- a/dom/base/Location.cpp
+++ b/dom/base/Location.cpp
@@ -32,9 +32,9 @@
 #include "mozilla/Likely.h"
 #include "nsCycleCollectionParticipant.h"
 #include "nsNullPrincipal.h"
-#include "ScriptSettings.h"
 #include "mozilla/Unused.h"
 #include "mozilla/dom/LocationBinding.h"
+#include "mozilla/dom/ScriptSettings.h"
 
 namespace mozilla {
 namespace dom {
diff --git a/dom/base/ScriptSettings.cpp b/dom/base/ScriptSettings.cpp
deleted file mode 100644
index 92ab221c9..000000000
--- a/dom/base/ScriptSettings.cpp
+++ /dev/null
@@ -1,839 +0,0 @@
-/* -*- 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 "mozilla/dom/ScriptSettings.h"
-#include "mozilla/ThreadLocal.h"
-#include "mozilla/Assertions.h"
-#include "mozilla/CycleCollectedJSContext.h"
-
-#include "jsapi.h"
-#include "xpcpublic.h"
-#include "nsIGlobalObject.h"
-#include "nsIDocShell.h"
-#include "nsIScriptGlobalObject.h"
-#include "nsIScriptContext.h"
-#include "nsContentUtils.h"
-#include "nsGlobalWindow.h"
-#include "nsPIDOMWindow.h"
-#include "nsTArray.h"
-#include "nsJSUtils.h"
-#include "nsDOMJSUtils.h"
-#include "WorkerPrivate.h"
-
-namespace mozilla {
-namespace dom {
-
-static MOZ_THREAD_LOCAL(ScriptSettingsStackEntry*) sScriptSettingsTLS;
-static bool sScriptSettingsTLSInitialized;
-
-class ScriptSettingsStack {
-public:
-  static ScriptSettingsStackEntry* Top() {
-    return sScriptSettingsTLS.get();
-  }
-
-  static void Push(ScriptSettingsStackEntry *aEntry) {
-    MOZ_ASSERT(!aEntry->mOlder);
-    // Whenever JSAPI use is disabled, the next stack entry pushed must
-    // not be an AutoIncumbentScript.
-    MOZ_ASSERT_IF(!Top() || Top()->NoJSAPI(),
-                  !aEntry->IsIncumbentScript());
-    // Whenever the top entry is not an incumbent canidate, the next stack entry
-    // pushed must not be an AutoIncumbentScript.
-    MOZ_ASSERT_IF(Top() && !Top()->IsIncumbentCandidate(),
-                  !aEntry->IsIncumbentScript());
-
-    aEntry->mOlder = Top();
-    sScriptSettingsTLS.set(aEntry);
-  }
-
-  static void Pop(ScriptSettingsStackEntry *aEntry) {
-    MOZ_ASSERT(aEntry == Top());
-    sScriptSettingsTLS.set(aEntry->mOlder);
-  }
-
-  static nsIGlobalObject* IncumbentGlobal() {
-    ScriptSettingsStackEntry *entry = Top();
-    while (entry) {
-      if (entry->IsIncumbentCandidate()) {
-        return entry->mGlobalObject;
-      }
-      entry = entry->mOlder;
-    }
-    return nullptr;
-  }
-
-  static ScriptSettingsStackEntry* EntryPoint() {
-    ScriptSettingsStackEntry *entry = Top();
-    while (entry) {
-      if (entry->IsEntryCandidate()) {
-        return entry;
-      }
-      entry = entry->mOlder;
-    }
-    return nullptr;
-  }
-
-  static nsIGlobalObject* EntryGlobal() {
-    ScriptSettingsStackEntry *entry = EntryPoint();
-    if (!entry) {
-      return nullptr;
-    }
-    return entry->mGlobalObject;
-  }
-
-#ifdef DEBUG
-  static ScriptSettingsStackEntry* TopNonIncumbentScript() {
-    ScriptSettingsStackEntry *entry = Top();
-    while (entry) {
-      if (!entry->IsIncumbentScript()) {
-        return entry;
-      }
-      entry = entry->mOlder;
-    }
-    return nullptr;
-  }
-#endif // DEBUG
-
-};
-
-static unsigned long gRunToCompletionListeners = 0;
-
-void
-UseEntryScriptProfiling()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  ++gRunToCompletionListeners;
-}
-
-void
-UnuseEntryScriptProfiling()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  MOZ_ASSERT(gRunToCompletionListeners > 0);
-  --gRunToCompletionListeners;
-}
-
-void
-InitScriptSettings()
-{
-  bool success = sScriptSettingsTLS.init();
-  if (!success) {
-    MOZ_CRASH();
-  }
-
-  sScriptSettingsTLS.set(nullptr);
-  sScriptSettingsTLSInitialized = true;
-}
-
-void
-DestroyScriptSettings()
-{
-  MOZ_ASSERT(sScriptSettingsTLS.get() == nullptr);
-}
-
-bool
-ScriptSettingsInitialized()
-{
-  return sScriptSettingsTLSInitialized;
-}
-
-ScriptSettingsStackEntry::ScriptSettingsStackEntry(nsIGlobalObject *aGlobal,
-                                                   Type aType)
-  : mGlobalObject(aGlobal)
-  , mType(aType)
-  , mOlder(nullptr)
-{
-  MOZ_ASSERT_IF(IsIncumbentCandidate() && !NoJSAPI(), mGlobalObject);
-  MOZ_ASSERT(!mGlobalObject || mGlobalObject->GetGlobalJSObject(),
-             "Must have an actual JS global for the duration on the stack");
-  MOZ_ASSERT(!mGlobalObject ||
-             JS_IsGlobalObject(mGlobalObject->GetGlobalJSObject()),
-             "No outer windows allowed");
-}
-
-ScriptSettingsStackEntry::~ScriptSettingsStackEntry()
-{
-  // We must have an actual JS global for the entire time this is on the stack.
-  MOZ_ASSERT_IF(mGlobalObject, mGlobalObject->GetGlobalJSObject());
-}
-
-// If the entry or incumbent global ends up being something that the subject
-// principal doesn't subsume, we don't want to use it. This never happens on
-// the web, but can happen with asymmetric privilege relationships (i.e.
-// nsExpandedPrincipal and System Principal).
-//
-// The most correct thing to use instead would be the topmost global on the
-// callstack whose principal is subsumed by the subject principal. But that's
-// hard to compute, so we just substitute the global of the current
-// compartment. In practice, this is fine.
-//
-// Note that in particular things like:
-//
-// |SpecialPowers.wrap(crossOriginWindow).eval(open())|
-//
-// trigger this case. Although both the entry global and the current global
-// have normal principals, the use of Gecko-specific System-Principaled JS
-// puts the code from two different origins on the callstack at once, which
-// doesn't happen normally on the web.
-static nsIGlobalObject*
-ClampToSubject(nsIGlobalObject* aGlobalOrNull)
-{
-  if (!aGlobalOrNull || !NS_IsMainThread()) {
-    return aGlobalOrNull;
-  }
-
-  nsIPrincipal* globalPrin = aGlobalOrNull->PrincipalOrNull();
-  NS_ENSURE_TRUE(globalPrin, GetCurrentGlobal());
-  if (!nsContentUtils::SubjectPrincipalOrSystemIfNativeCaller()->SubsumesConsideringDomain(globalPrin)) {
-    return GetCurrentGlobal();
-  }
-
-  return aGlobalOrNull;
-}
-
-nsIGlobalObject*
-GetEntryGlobal()
-{
-  return ClampToSubject(ScriptSettingsStack::EntryGlobal());
-}
-
-nsIDocument*
-GetEntryDocument()
-{
-  nsIGlobalObject* global = GetEntryGlobal();
-  nsCOMPtr<nsPIDOMWindowInner> entryWin = do_QueryInterface(global);
-
-  // If our entry global isn't a window, see if it's an addon scope associated
-  // with a window. If it is, the caller almost certainly wants that rather
-  // than null.
-  if (!entryWin && global) {
-    if (auto* win = xpc::AddonWindowOrNull(global->GetGlobalJSObject())) {
-      entryWin = win->AsInner();
-    }
-  }
-
-  return entryWin ? entryWin->GetExtantDoc() : nullptr;
-}
-
-nsIGlobalObject*
-GetIncumbentGlobal()
-{
-  // We need the current JSContext in order to check the JS for
-  // scripted frames that may have appeared since anyone last
-  // manipulated the stack. If it's null, that means that there
-  // must be no entry global on the stack, and therefore no incumbent
-  // global either.
-  JSContext *cx = nsContentUtils::GetCurrentJSContextForThread();
-  if (!cx) {
-    MOZ_ASSERT(ScriptSettingsStack::EntryGlobal() == nullptr);
-    return nullptr;
-  }
-
-  // See what the JS engine has to say. If we've got a scripted caller
-  // override in place, the JS engine will lie to us and pretend that
-  // there's nothing on the JS stack, which will cause us to check the
-  // incumbent script stack below.
-  if (JSObject *global = JS::GetScriptedCallerGlobal(cx)) {
-    return ClampToSubject(xpc::NativeGlobal(global));
-  }
-
-  // Ok, nothing from the JS engine. Let's use whatever's on the
-  // explicit stack.
-  return ClampToSubject(ScriptSettingsStack::IncumbentGlobal());
-}
-
-nsIGlobalObject*
-GetCurrentGlobal()
-{
-  JSContext *cx = nsContentUtils::GetCurrentJSContextForThread();
-  if (!cx) {
-    return nullptr;
-  }
-
-  JSObject *global = JS::CurrentGlobalOrNull(cx);
-  if (!global) {
-    return nullptr;
-  }
-
-  return xpc::NativeGlobal(global);
-}
-
-nsIPrincipal*
-GetWebIDLCallerPrincipal()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-  ScriptSettingsStackEntry *entry = ScriptSettingsStack::EntryPoint();
-
-  // If we have an entry point that is not NoJSAPI, we know it must be an
-  // AutoEntryScript.
-  if (!entry || entry->NoJSAPI()) {
-    return nullptr;
-  }
-  AutoEntryScript* aes = static_cast<AutoEntryScript*>(entry);
-
-  return aes->mWebIDLCallerPrincipal;
-}
-
-bool
-IsJSAPIActive()
-{
-  ScriptSettingsStackEntry* topEntry = ScriptSettingsStack::Top();
-  return topEntry && !topEntry->NoJSAPI();
-}
-
-namespace danger {
-JSContext*
-GetJSContext()
-{
-  return CycleCollectedJSContext::Get()->Context();
-}
-} // namespace danger
-
-JS::RootingContext*
-RootingCx()
-{
-  return CycleCollectedJSContext::Get()->RootingCx();
-}
-
-AutoJSAPI::AutoJSAPI()
-  : ScriptSettingsStackEntry(nullptr, eJSAPI)
-  , mCx(nullptr)
-  , mIsMainThread(false) // For lack of anything better
-{
-}
-
-AutoJSAPI::~AutoJSAPI()
-{
-  if (!mCx) {
-    // No need to do anything here: we never managed to Init, so can't have an
-    // exception on our (nonexistent) JSContext.  We also don't need to restore
-    // any state on it.  Finally, we never made it to pushing outselves onto the
-    // ScriptSettingsStack, so shouldn't pop.
-    MOZ_ASSERT(ScriptSettingsStack::Top() != this);
-    return;
-  }
-
-  ReportException();
-
-  if (mOldWarningReporter.isSome()) {
-    JS::SetWarningReporter(cx(), mOldWarningReporter.value());
-  }
-
-  // Leave the request before popping.
-  if (mIsMainThread) {
-    mAutoRequest.reset();
-  }
-
-  ScriptSettingsStack::Pop(this);
-}
-
-void
-WarningOnlyErrorReporter(JSContext* aCx, JSErrorReport* aRep);
-
-void
-AutoJSAPI::InitInternal(nsIGlobalObject* aGlobalObject, JSObject* aGlobal,
-                        JSContext* aCx, bool aIsMainThread)
-{
-  MOZ_ASSERT(aCx);
-  MOZ_ASSERT(aCx == danger::GetJSContext());
-  MOZ_ASSERT(aIsMainThread == NS_IsMainThread());
-  MOZ_ASSERT(bool(aGlobalObject) == bool(aGlobal));
-  MOZ_ASSERT_IF(aGlobalObject, aGlobalObject->GetGlobalJSObject() == aGlobal);
-#ifdef DEBUG
-  bool haveException = JS_IsExceptionPending(aCx);
-#endif // DEBUG
-
-  mCx = aCx;
-  mIsMainThread = aIsMainThread;
-  mGlobalObject = aGlobalObject;
-  if (aIsMainThread) {
-    // We _could_ just unconditionally emplace mAutoRequest here.  It's just not
-    // needed on worker threads, and we're hoping to kill it on the main thread
-    // too.
-    mAutoRequest.emplace(mCx);
-  }
-  if (aGlobal) {
-    JS::ExposeObjectToActiveJS(aGlobal);
-  }
-  mAutoNullableCompartment.emplace(mCx, aGlobal);
-
-  ScriptSettingsStack::Push(this);
-
-  mOldWarningReporter.emplace(JS::GetWarningReporter(aCx));
-
-  JS::SetWarningReporter(aCx, WarningOnlyErrorReporter);
-
-#ifdef DEBUG
-  if (haveException) {
-    JS::Rooted<JS::Value> exn(aCx);
-    JS_GetPendingException(aCx, &exn);
-
-    JS_ClearPendingException(aCx);
-    if (exn.isObject()) {
-      JS::Rooted<JSObject*> exnObj(aCx, &exn.toObject());
-
-      nsAutoJSString stack, filename, name, message;
-      int32_t line;
-
-      JS::Rooted<JS::Value> tmp(aCx);
-      if (!JS_GetProperty(aCx, exnObj, "filename", &tmp)) {
-        JS_ClearPendingException(aCx);
-      }
-      if (tmp.isUndefined()) {
-        if (!JS_GetProperty(aCx, exnObj, "fileName", &tmp)) {
-          JS_ClearPendingException(aCx);
-        }
-      }
-
-      if (!filename.init(aCx, tmp)) {
-        JS_ClearPendingException(aCx);
-      }
-
-      if (!JS_GetProperty(aCx, exnObj, "stack", &tmp) ||
-          !stack.init(aCx, tmp)) {
-        JS_ClearPendingException(aCx);
-      }
-
-      if (!JS_GetProperty(aCx, exnObj, "name", &tmp) ||
-          !name.init(aCx, tmp)) {
-        JS_ClearPendingException(aCx);
-      }
-
-      if (!JS_GetProperty(aCx, exnObj, "message", &tmp) ||
-          !message.init(aCx, tmp)) {
-        JS_ClearPendingException(aCx);
-      }
-
-      if (!JS_GetProperty(aCx, exnObj, "lineNumber", &tmp) ||
-          !JS::ToInt32(aCx, tmp, &line)) {
-        JS_ClearPendingException(aCx);
-        line = 0;
-      }
-
-      printf_stderr("PREEXISTING EXCEPTION OBJECT: '%s: %s'\n%s:%d\n%s\n",
-                    NS_ConvertUTF16toUTF8(name).get(),
-                    NS_ConvertUTF16toUTF8(message).get(),
-                    NS_ConvertUTF16toUTF8(filename).get(), line,
-                    NS_ConvertUTF16toUTF8(stack).get());
-    } else {
-      // It's a primitive... not much we can do other than stringify it.
-      nsAutoJSString exnStr;
-      if (!exnStr.init(aCx, exn)) {
-        JS_ClearPendingException(aCx);
-      }
-
-      printf_stderr("PREEXISTING EXCEPTION PRIMITIVE: %s\n",
-                    NS_ConvertUTF16toUTF8(exnStr).get());
-    }
-    MOZ_ASSERT(false, "We had an exception; we should not have");
-  }
-#endif // DEBUG
-}
-
-AutoJSAPI::AutoJSAPI(nsIGlobalObject* aGlobalObject,
-                     bool aIsMainThread,
-                     Type aType)
-  : ScriptSettingsStackEntry(aGlobalObject, aType)
-  , mIsMainThread(aIsMainThread)
-{
-  MOZ_ASSERT(aGlobalObject);
-  MOZ_ASSERT(aGlobalObject->GetGlobalJSObject(), "Must have a JS global");
-  MOZ_ASSERT(aIsMainThread == NS_IsMainThread());
-
-  InitInternal(aGlobalObject, aGlobalObject->GetGlobalJSObject(),
-               danger::GetJSContext(), aIsMainThread);
-}
-
-void
-AutoJSAPI::Init()
-{
-  MOZ_ASSERT(!mCx, "An AutoJSAPI should only be initialised once");
-
-  InitInternal(/* aGlobalObject */ nullptr, /* aGlobal */ nullptr,
-               danger::GetJSContext(), NS_IsMainThread());
-}
-
-bool
-AutoJSAPI::Init(nsIGlobalObject* aGlobalObject, JSContext* aCx)
-{
-  MOZ_ASSERT(!mCx, "An AutoJSAPI should only be initialised once");
-  MOZ_ASSERT(aCx);
-
-  if (NS_WARN_IF(!aGlobalObject)) {
-    return false;
-  }
-
-  JSObject* global = aGlobalObject->GetGlobalJSObject();
-  if (NS_WARN_IF(!global)) {
-    return false;
-  }
-
-  InitInternal(aGlobalObject, global, aCx, NS_IsMainThread());
-  return true;
-}
-
-bool
-AutoJSAPI::Init(nsIGlobalObject* aGlobalObject)
-{
-  return Init(aGlobalObject, danger::GetJSContext());
-}
-
-bool
-AutoJSAPI::Init(JSObject* aObject)
-{
-  nsIGlobalObject* global = nullptr;
-  if (aObject)
-    global = xpc::NativeGlobal(aObject);
-  if (global)
-    return Init(global);
-  else
-    return false;
-}
-
-bool
-AutoJSAPI::Init(nsPIDOMWindowInner* aWindow, JSContext* aCx)
-{
-  return Init(nsGlobalWindow::Cast(aWindow), aCx);
-}
-
-bool
-AutoJSAPI::Init(nsPIDOMWindowInner* aWindow)
-{
-  return Init(nsGlobalWindow::Cast(aWindow));
-}
-
-bool
-AutoJSAPI::Init(nsGlobalWindow* aWindow, JSContext* aCx)
-{
-  return Init(static_cast<nsIGlobalObject*>(aWindow), aCx);
-}
-
-bool
-AutoJSAPI::Init(nsGlobalWindow* aWindow)
-{
-  return Init(static_cast<nsIGlobalObject*>(aWindow));
-}
-
-// Even with autoJSAPIOwnsErrorReporting, the JS engine still sends warning
-// reports to the JSErrorReporter as soon as they are generated. These go
-// directly to the console, so we can handle them easily here.
-//
-// Eventually, SpiderMonkey will have a special-purpose callback for warnings
-// only.
-void
-WarningOnlyErrorReporter(JSContext* aCx, JSErrorReport* aRep)
-{
-  MOZ_ASSERT(JSREPORT_IS_WARNING(aRep->flags));
-  if (!NS_IsMainThread()) {
-    // Reporting a warning on workers is a bit complicated because we have to
-    // climb our parent chain until we get to the main thread.  So go ahead and
-    // just go through the worker ReportError codepath here.
-    //
-    // That said, it feels like we should be able to short-circuit things a bit
-    // here by posting an appropriate runnable to the main thread directly...
-    // Worth looking into sometime.
-    workers::WorkerPrivate* worker = workers::GetWorkerPrivateFromContext(aCx);
-    MOZ_ASSERT(worker);
-
-    worker->ReportError(aCx, JS::ConstUTF8CharsZ(), aRep);
-    return;
-  }
-
-  RefPtr<xpc::ErrorReport> xpcReport = new xpc::ErrorReport();
-  nsGlobalWindow* win = xpc::CurrentWindowOrNull(aCx);
-  if (!win) {
-    // We run addons in a separate privileged compartment, but if we're in an
-    // addon compartment we should log warnings to the console of the associated
-    // DOM Window.
-    win = xpc::AddonWindowOrNull(JS::CurrentGlobalOrNull(aCx));
-  }
-  xpcReport->Init(aRep, nullptr, nsContentUtils::IsCallerChrome(),
-                  win ? win->AsInner()->WindowID() : 0);
-  xpcReport->LogToConsole();
-}
-
-void
-AutoJSAPI::ReportException()
-{
-  if (!HasException()) {
-    return;
-  }
-
-  // AutoJSAPI uses a JSAutoNullableCompartment, and may be in a null
-  // compartment when the destructor is called. However, the JS engine
-  // requires us to be in a compartment when we fetch the pending exception.
-  // In this case, we enter the privileged junk scope and don't dispatch any
-  // error events.
-  JS::Rooted<JSObject*> errorGlobal(cx(), JS::CurrentGlobalOrNull(cx()));
-  if (!errorGlobal) {
-    if (mIsMainThread) {
-      errorGlobal = xpc::PrivilegedJunkScope();
-    } else {
-      errorGlobal = workers::GetCurrentThreadWorkerGlobal();
-    }
-  }
-  JSAutoCompartment ac(cx(), errorGlobal);
-  JS::Rooted<JS::Value> exn(cx());
-  js::ErrorReport jsReport(cx());
-  if (StealException(&exn) &&
-      jsReport.init(cx(), exn, js::ErrorReport::WithSideEffects)) {
-    if (mIsMainThread) {
-      RefPtr<xpc::ErrorReport> xpcReport = new xpc::ErrorReport();
-
-      RefPtr<nsGlobalWindow> win = xpc::WindowGlobalOrNull(errorGlobal);
-      if (!win) {
-        // We run addons in a separate privileged compartment, but they still
-        // expect to trigger the onerror handler of their associated DOM Window.
-        win = xpc::AddonWindowOrNull(errorGlobal);
-      }
-      nsPIDOMWindowInner* inner = win ? win->AsInner() : nullptr;
-      xpcReport->Init(jsReport.report(), jsReport.toStringResult().c_str(),
-                      nsContentUtils::IsCallerChrome(),
-                      inner ? inner->WindowID() : 0);
-      if (inner && jsReport.report()->errorNumber != JSMSG_OUT_OF_MEMORY) {
-        JS::RootingContext* rcx = JS::RootingContext::get(cx());
-        DispatchScriptErrorEvent(inner, rcx, xpcReport, exn);
-      } else {
-        JS::Rooted<JSObject*> stack(cx(),
-          xpc::FindExceptionStackForConsoleReport(inner, exn));
-        xpcReport->LogToConsoleWithStack(stack);
-      }
-    } else {
-      // On a worker, we just use the worker error reporting mechanism and don't
-      // bother with xpc::ErrorReport.  This will ensure that all the right
-      // events (which are a lot more complicated than in the window case) get
-      // fired.
-      workers::WorkerPrivate* worker = workers::GetCurrentThreadWorkerPrivate();
-      MOZ_ASSERT(worker);
-      MOZ_ASSERT(worker->GetJSContext() == cx());
-      // Before invoking ReportError, put the exception back on the context,
-      // because it may want to put it in its error events and has no other way
-      // to get hold of it.  After we invoke ReportError, clear the exception on
-      // cx(), just in case ReportError didn't.
-      JS_SetPendingException(cx(), exn);
-      worker->ReportError(cx(), jsReport.toStringResult(), jsReport.report());
-      ClearException();
-    }
-  } else {
-    NS_WARNING("OOMed while acquiring uncaught exception from JSAPI");
-    ClearException();
-  }
-}
-
-bool
-AutoJSAPI::PeekException(JS::MutableHandle<JS::Value> aVal)
-{
-  MOZ_ASSERT_IF(mIsMainThread, IsStackTop());
-  MOZ_ASSERT(HasException());
-  MOZ_ASSERT(js::GetContextCompartment(cx()));
-  if (!JS_GetPendingException(cx(), aVal)) {
-    return false;
-  }
-  return true;
-}
-
-bool
-AutoJSAPI::StealException(JS::MutableHandle<JS::Value> aVal)
-{
-  if (!PeekException(aVal)) {
-    return false;
-  }
-  JS_ClearPendingException(cx());
-  return true;
-}
-
-#ifdef DEBUG
-bool
-AutoJSAPI::IsStackTop() const
-{
-  return ScriptSettingsStack::TopNonIncumbentScript() == this;
-}
-#endif // DEBUG
-
-AutoEntryScript::AutoEntryScript(nsIGlobalObject* aGlobalObject,
-                                 const char *aReason,
-                                 bool aIsMainThread)
-  : AutoJSAPI(aGlobalObject, aIsMainThread, eEntryScript)
-  , mWebIDLCallerPrincipal(nullptr)
-{
-  MOZ_ASSERT(aGlobalObject);
-
-  if (aIsMainThread && gRunToCompletionListeners > 0) {
-    mDocShellEntryMonitor.emplace(cx(), aReason);
-  }
-}
-
-AutoEntryScript::AutoEntryScript(JSObject* aObject,
-                                 const char *aReason,
-                                 bool aIsMainThread)
-  : AutoEntryScript(xpc::NativeGlobal(aObject), aReason, aIsMainThread)
-{
-}
-
-AutoEntryScript::~AutoEntryScript()
-{
-  // GC when we pop a script entry point. This is a useful heuristic that helps
-  // us out on certain (flawed) benchmarks like sunspider, because it lets us
-  // avoid GCing during the timing loop.
-  JS_MaybeGC(cx());
-}
-
-AutoEntryScript::DocshellEntryMonitor::DocshellEntryMonitor(JSContext* aCx,
-                                                            const char* aReason)
-  : JS::dbg::AutoEntryMonitor(aCx)
-  , mReason(aReason)
-{
-}
-
-void
-AutoEntryScript::DocshellEntryMonitor::Entry(JSContext* aCx, JSFunction* aFunction,
-                                             JSScript* aScript, JS::Handle<JS::Value> aAsyncStack,
-                                             const char* aAsyncCause)
-{
-  JS::Rooted<JSFunction*> rootedFunction(aCx);
-  if (aFunction) {
-    rootedFunction = aFunction;
-  }
-  JS::Rooted<JSScript*> rootedScript(aCx);
-  if (aScript) {
-    rootedScript = aScript;
-  }
-
-  nsCOMPtr<nsPIDOMWindowInner> window =
-    do_QueryInterface(xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx)));
-  if (!window || !window->GetDocShell() ||
-      !window->GetDocShell()->GetRecordProfileTimelineMarkers()) {
-    return;
-  }
-
-  nsCOMPtr<nsIDocShell> docShellForJSRunToCompletion = window->GetDocShell();
-  nsString filename;
-  uint32_t lineNumber = 0;
-
-  js::AutoStableStringChars functionName(aCx);
-  if (rootedFunction) {
-    JS::Rooted<JSString*> displayId(aCx, JS_GetFunctionDisplayId(rootedFunction));
-    if (displayId) {
-      if (!functionName.initTwoByte(aCx, displayId)) {
-        JS_ClearPendingException(aCx);
-        return;
-      }
-    }
-  }
-
-  if (!rootedScript) {
-    rootedScript = JS_GetFunctionScript(aCx, rootedFunction);
-  }
-  if (rootedScript) {
-    filename = NS_ConvertUTF8toUTF16(JS_GetScriptFilename(rootedScript));
-    lineNumber = JS_GetScriptBaseLineNumber(aCx, rootedScript);
-  }
-
-  if (!filename.IsEmpty() || functionName.isTwoByte()) {
-    const char16_t* functionNameChars = functionName.isTwoByte() ?
-      functionName.twoByteChars() : nullptr;
-
-    docShellForJSRunToCompletion->NotifyJSRunToCompletionStart(mReason,
-                                                               functionNameChars,
-                                                               filename.BeginReading(),
-                                                               lineNumber, aAsyncStack,
-                                                               aAsyncCause);
-  }
-}
-
-void
-AutoEntryScript::DocshellEntryMonitor::Exit(JSContext* aCx)
-{
-  nsCOMPtr<nsPIDOMWindowInner> window =
-    do_QueryInterface(xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx)));
-  // Not really worth checking GetRecordProfileTimelineMarkers here.
-  if (window && window->GetDocShell()) {
-    nsCOMPtr<nsIDocShell> docShellForJSRunToCompletion = window->GetDocShell();
-    docShellForJSRunToCompletion->NotifyJSRunToCompletionStop();
-  }
-}
-
-AutoIncumbentScript::AutoIncumbentScript(nsIGlobalObject* aGlobalObject)
-  : ScriptSettingsStackEntry(aGlobalObject, eIncumbentScript)
-  , mCallerOverride(nsContentUtils::GetCurrentJSContextForThread())
-{
-  ScriptSettingsStack::Push(this);
-}
-
-AutoIncumbentScript::~AutoIncumbentScript()
-{
-  ScriptSettingsStack::Pop(this);
-}
-
-AutoNoJSAPI::AutoNoJSAPI()
-  : ScriptSettingsStackEntry(nullptr, eNoJSAPI)
-{
-  ScriptSettingsStack::Push(this);
-}
-
-AutoNoJSAPI::~AutoNoJSAPI()
-{
-  ScriptSettingsStack::Pop(this);
-}
-
-} // namespace dom
-
-AutoJSContext::AutoJSContext(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM_IN_IMPL)
-  : mCx(nullptr)
-{
-  JS::AutoSuppressGCAnalysis nogc;
-  MOZ_ASSERT(!mCx, "mCx should not be initialized!");
-  MOZ_ASSERT(NS_IsMainThread());
-
-  MOZ_GUARD_OBJECT_NOTIFIER_INIT;
-
-  if (dom::IsJSAPIActive()) {
-    mCx = dom::danger::GetJSContext();
-  } else {
-    mJSAPI.Init();
-    mCx = mJSAPI.cx();
-  }
-}
-
-AutoJSContext::operator JSContext*() const
-{
-  return mCx;
-}
-
-AutoSafeJSContext::AutoSafeJSContext(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM_IN_IMPL)
-  : AutoJSAPI()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-
-  MOZ_GUARD_OBJECT_NOTIFIER_INIT;
-
-  DebugOnly<bool> ok = Init(xpc::UnprivilegedJunkScope());
-  MOZ_ASSERT(ok,
-             "This is quite odd.  We should have crashed in the "
-             "xpc::NativeGlobal() call if xpc::UnprivilegedJunkScope() "
-             "returned null, and inited correctly otherwise!");
-}
-
-AutoSlowOperation::AutoSlowOperation(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM_IN_IMPL)
-  : AutoJSAPI()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-
-  MOZ_GUARD_OBJECT_NOTIFIER_INIT;
-
-  Init();
-}
-
-void
-AutoSlowOperation::CheckForInterrupt()
-{
-  // JS_CheckForInterrupt expects us to be in a compartment.
-  JSAutoCompartment ac(cx(), xpc::UnprivilegedJunkScope());
-  JS_CheckForInterrupt(cx());
-}
-
-} // namespace mozilla
diff --git a/dom/base/ScriptSettings.h b/dom/base/ScriptSettings.h
deleted file mode 100644
index 05e62f55e..000000000
--- a/dom/base/ScriptSettings.h
+++ /dev/null
@@ -1,465 +0,0 @@
-/* -*- 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/. */
-
-/* Utilities for managing the script settings object stack defined in webapps */
-
-#ifndef mozilla_dom_ScriptSettings_h
-#define mozilla_dom_ScriptSettings_h
-
-#include "MainThreadUtils.h"
-#include "nsIGlobalObject.h"
-#include "nsIPrincipal.h"
-
-#include "mozilla/Maybe.h"
-
-#include "jsapi.h"
-#include "js/Debug.h"
-
-class nsPIDOMWindowInner;
-class nsGlobalWindow;
-class nsIScriptContext;
-class nsIDocument;
-class nsIDocShell;
-
-namespace mozilla {
-namespace dom {
-
-/*
- * System-wide setup/teardown routines. Init and Destroy should be invoked
- * once each, at startup and shutdown (respectively).
- */
-void InitScriptSettings();
-void DestroyScriptSettings();
-bool ScriptSettingsInitialized();
-
-/*
- * Static helpers in ScriptSettings which track the number of listeners
- * of Javascript RunToCompletion events.  These should be used by the code in
- * nsDocShell::SetRecordProfileTimelineMarkers to indicate to script
- * settings that script run-to-completion needs to be monitored.
- * SHOULD BE CALLED ONLY BY MAIN THREAD.
- */
-void UseEntryScriptProfiling();
-void UnuseEntryScriptProfiling();
-
-// To implement a web-compatible browser, it is often necessary to obtain the
-// global object that is "associated" with the currently-running code. This
-// process is made more complicated by the fact that, historically, different
-// algorithms have operated with different definitions of the "associated"
-// global.
-//
-// HTML5 formalizes this into two concepts: the "incumbent global" and the
-// "entry global". The incumbent global corresponds to the global of the
-// current script being executed, whereas the entry global corresponds to the
-// global of the script where the current JS execution began.
-//
-// There is also a potentially-distinct third global that is determined by the
-// current compartment. This roughly corresponds with the notion of Realms in
-// ECMAScript.
-//
-// Suppose some event triggers an event listener in window |A|, which invokes a
-// scripted function in window |B|, which invokes the |window.location.href|
-// setter in window |C|. The entry global would be |A|, the incumbent global
-// would be |B|, and the current compartment would be that of |C|.
-//
-// In general, it's best to use to use the most-closely-associated global
-// unless the spec says to do otherwise. In 95% of the cases, the global of
-// the current compartment (GetCurrentGlobal()) is the right thing. For
-// example, WebIDL constructors (new C.XMLHttpRequest()) are initialized with
-// the global of the current compartment (i.e. |C|).
-//
-// The incumbent global is very similar, but differs in a few edge cases. For
-// example, if window |B| does |C.location.href = "..."|, the incumbent global
-// used for the navigation algorithm is B, because no script from |C| was ever run.
-//
-// The entry global is used for various things like computing base URIs, mostly
-// for historical reasons.
-//
-// Note that all of these functions return bonafide global objects. This means
-// that, for Windows, they always return the inner.
-
-// Returns the global associated with the top-most Candidate Entry Point on
-// the Script Settings Stack. See the HTML spec. This may be null.
-nsIGlobalObject* GetEntryGlobal();
-
-// If the entry global is a window, returns its extant document. Otherwise,
-// returns null.
-nsIDocument* GetEntryDocument();
-
-// Returns the global associated with the top-most entry of the the Script
-// Settings Stack. See the HTML spec. This may be null.
-nsIGlobalObject* GetIncumbentGlobal();
-
-// Returns the global associated with the current compartment. This may be null.
-nsIGlobalObject* GetCurrentGlobal();
-
-// JS-implemented WebIDL presents an interesting situation with respect to the
-// subject principal. A regular C++-implemented API can simply examine the
-// compartment of the most-recently-executed script, and use that to infer the
-// responsible party. However, JS-implemented APIs are run with system
-// principal, and thus clobber the subject principal of the script that
-// invoked the API. So we have to do some extra work to keep track of this
-// information.
-//
-// We therefore implement the following behavior:
-// * Each Script Settings Object has an optional WebIDL Caller Principal field.
-//   This defaults to null.
-// * When we push an Entry Point in preparation to run a JS-implemented WebIDL
-//   callback, we grab the subject principal at the time of invocation, and
-//   store that as the WebIDL Caller Principal.
-// * When non-null, callers can query this principal from script via an API on
-//   Components.utils.
-nsIPrincipal* GetWebIDLCallerPrincipal();
-
-// This may be used by callers that know that their incumbent global is non-
-// null (i.e. they know there have been no System Caller pushes since the
-// inner-most script execution).
-inline JSObject& IncumbentJSGlobal()
-{
-  return *GetIncumbentGlobal()->GetGlobalJSObject();
-}
-
-// Returns whether JSAPI is active right now.  If it is not, working with a
-// JSContext you grab from somewhere random is not OK and you should be doing
-// AutoJSAPI or AutoEntryScript to get yourself a properly set up JSContext.
-bool IsJSAPIActive();
-
-namespace danger {
-
-// Get the JSContext for this thread.  This is in the "danger" namespace because
-// we generally want people using AutoJSAPI instead, unless they really know
-// what they're doing.
-JSContext* GetJSContext();
-
-} // namespace danger
-
-JS::RootingContext* RootingCx();
-
-class ScriptSettingsStack;
-class ScriptSettingsStackEntry {
-  friend class ScriptSettingsStack;
-
-public:
-  ~ScriptSettingsStackEntry();
-
-  bool NoJSAPI() const { return mType == eNoJSAPI; }
-  bool IsEntryCandidate() const {
-    return mType == eEntryScript || mType == eNoJSAPI;
-  }
-  bool IsIncumbentCandidate() { return mType != eJSAPI; }
-  bool IsIncumbentScript() { return mType == eIncumbentScript; }
-
-protected:
-  enum Type {
-    eEntryScript,
-    eIncumbentScript,
-    eJSAPI,
-    eNoJSAPI
-  };
-
-  ScriptSettingsStackEntry(nsIGlobalObject *aGlobal,
-                           Type aEntryType);
-
-  nsCOMPtr<nsIGlobalObject> mGlobalObject;
-  Type mType;
-
-private:
-  ScriptSettingsStackEntry *mOlder;
-};
-
-/*
- * For any interaction with JSAPI, an AutoJSAPI (or one of its subclasses)
- * must be on the stack.
- *
- * This base class should be instantiated as-is when the caller wants to use
- * JSAPI but doesn't expect to run script. The caller must then call one of its
- * Init functions before being able to access the JSContext through cx().
- * Its current duties are as-follows (see individual Init comments for details):
- *
- * * Grabbing an appropriate JSContext, and, on the main thread, pushing it onto
- *   the JSContext stack.
- * * Entering an initial (possibly null) compartment, to ensure that the
- *   previously entered compartment for that JSContext is not used by mistake.
- * * Reporting any exceptions left on the JSRuntime, unless the caller steals
- *   or silences them.
- * * On main thread, entering a JSAutoRequest.
- *
- * Additionally, the following duties are planned, but not yet implemented:
- *
- * * De-poisoning the JSRuntime to allow manipulation of JSAPI. This requires
- *   implementing the poisoning first.  For now, this de-poisoning
- *   effectively corresponds to having a non-null cx on the stack.
- *
- * In situations where the consumer expects to run script, AutoEntryScript
- * should be used, which does additional manipulation of the script settings
- * stack. In bug 991758, we'll add hard invariants to SpiderMonkey, such that
- * any attempt to run script without an AutoEntryScript on the stack will
- * fail. This prevents system code from accidentally triggering script
- * execution at inopportune moments via surreptitious getters and proxies.
- */
-class MOZ_STACK_CLASS AutoJSAPI : protected ScriptSettingsStackEntry {
-public:
-  // Trivial constructor. One of the Init functions must be called before
-  // accessing the JSContext through cx().
-  AutoJSAPI();
-
-  ~AutoJSAPI();
-
-  // This uses the SafeJSContext (or worker equivalent), and enters a null
-  // compartment, so that the consumer is forced to select a compartment to
-  // enter before manipulating objects.
-  //
-  // This variant will ensure that any errors reported by this AutoJSAPI as it
-  // comes off the stack will not fire error events or be associated with any
-  // particular web-visible global.
-  void Init();
-
-  // This uses the SafeJSContext (or worker equivalent), and enters the
-  // compartment of aGlobalObject.
-  // If aGlobalObject or its associated JS global are null then it returns
-  // false and use of cx() will cause an assertion.
-  //
-  // If aGlobalObject represents a web-visible global, errors reported by this
-  // AutoJSAPI as it comes off the stack will fire the relevant error events and
-  // show up in the corresponding web console.
-  MOZ_MUST_USE bool Init(nsIGlobalObject* aGlobalObject);
-
-  // This is a helper that grabs the native global associated with aObject and
-  // invokes the above Init() with that.
-  MOZ_MUST_USE bool Init(JSObject* aObject);
-
-  // Unsurprisingly, this uses aCx and enters the compartment of aGlobalObject.
-  // If aGlobalObject or its associated JS global are null then it returns
-  // false and use of cx() will cause an assertion.
-  // If aCx is null it will cause an assertion.
-  //
-  // If aGlobalObject represents a web-visible global, errors reported by this
-  // AutoJSAPI as it comes off the stack will fire the relevant error events and
-  // show up in the corresponding web console.
-  MOZ_MUST_USE bool Init(nsIGlobalObject* aGlobalObject, JSContext* aCx);
-
-  // Convenience functions to take an nsPIDOMWindow* or nsGlobalWindow*,
-  // when it is more easily available than an nsIGlobalObject.
-  MOZ_MUST_USE bool Init(nsPIDOMWindowInner* aWindow);
-  MOZ_MUST_USE bool Init(nsPIDOMWindowInner* aWindow, JSContext* aCx);
-
-  MOZ_MUST_USE bool Init(nsGlobalWindow* aWindow);
-  MOZ_MUST_USE bool Init(nsGlobalWindow* aWindow, JSContext* aCx);
-
-  JSContext* cx() const {
-    MOZ_ASSERT(mCx, "Must call Init before using an AutoJSAPI");
-    MOZ_ASSERT(IsStackTop());
-    return mCx;
-  }
-
-#ifdef DEBUG
-  bool IsStackTop() const;
-#endif
-
-  // If HasException, report it.  Otherwise, a no-op.
-  void ReportException();
-
-  bool HasException() const {
-    MOZ_ASSERT(IsStackTop());
-    return JS_IsExceptionPending(cx());
-  };
-
-  // Transfers ownership of the current exception from the JS engine to the
-  // caller. Callers must ensure that HasException() is true, and that cx()
-  // is in a non-null compartment.
-  //
-  // Note that this fails if and only if we OOM while wrapping the exception
-  // into the current compartment.
-  MOZ_MUST_USE bool StealException(JS::MutableHandle<JS::Value> aVal);
-
-  // Peek the current exception from the JS engine, without stealing it.
-  // Callers must ensure that HasException() is true, and that cx() is in a
-  // non-null compartment.
-  //
-  // Note that this fails if and only if we OOM while wrapping the exception
-  // into the current compartment.
-  MOZ_MUST_USE bool PeekException(JS::MutableHandle<JS::Value> aVal);
-
-  void ClearException() {
-    MOZ_ASSERT(IsStackTop());
-    JS_ClearPendingException(cx());
-  }
-
-protected:
-  // Protected constructor for subclasses.  This constructor initialises the
-  // AutoJSAPI, so Init must NOT be called on subclasses that use this.
-  AutoJSAPI(nsIGlobalObject* aGlobalObject, bool aIsMainThread, Type aType);
-
-private:
-  mozilla::Maybe<JSAutoRequest> mAutoRequest;
-  mozilla::Maybe<JSAutoNullableCompartment> mAutoNullableCompartment;
-  JSContext *mCx;
-
-  // Whether we're mainthread or not; set when we're initialized.
-  bool mIsMainThread;
-  Maybe<JS::WarningReporter> mOldWarningReporter;
-
-  void InitInternal(nsIGlobalObject* aGlobalObject, JSObject* aGlobal,
-                    JSContext* aCx, bool aIsMainThread);
-
-  AutoJSAPI(const AutoJSAPI&) = delete;
-  AutoJSAPI& operator= (const AutoJSAPI&) = delete;
-};
-
-/*
- * A class that represents a new script entry point.
- *
- * |aReason| should be a statically-allocated C string naming the reason we're
- * invoking JavaScript code: "setTimeout", "event", and so on. The devtools use
- * these strings to label JS execution in timeline and profiling displays.
- */
-class MOZ_STACK_CLASS AutoEntryScript : public AutoJSAPI {
-public:
-  AutoEntryScript(nsIGlobalObject* aGlobalObject,
-                  const char *aReason,
-                  bool aIsMainThread = NS_IsMainThread());
-
-  AutoEntryScript(JSObject* aObject, // Any object from the relevant global
-                  const char *aReason,
-                  bool aIsMainThread = NS_IsMainThread());
-
-  ~AutoEntryScript();
-
-  void SetWebIDLCallerPrincipal(nsIPrincipal *aPrincipal) {
-    mWebIDLCallerPrincipal = aPrincipal;
-  }
-
-private:
-  // A subclass of AutoEntryMonitor that notifies the docshell.
-  class DocshellEntryMonitor final : public JS::dbg::AutoEntryMonitor
-  {
-  public:
-    DocshellEntryMonitor(JSContext* aCx, const char* aReason);
-
-    // Please note that |aAsyncCause| here is owned by the caller, and its
-    // lifetime must outlive the lifetime of the DocshellEntryMonitor object.
-    // In practice, |aAsyncCause| is identical to |aReason| passed into
-    // the AutoEntryScript constructor, so the lifetime requirements are
-    // trivially satisfied by |aReason| being a statically allocated string.
-    void Entry(JSContext* aCx, JSFunction* aFunction,
-               JS::Handle<JS::Value> aAsyncStack,
-               const char* aAsyncCause) override
-    {
-      Entry(aCx, aFunction, nullptr, aAsyncStack, aAsyncCause);
-    }
-
-    void Entry(JSContext* aCx, JSScript* aScript,
-               JS::Handle<JS::Value> aAsyncStack,
-               const char* aAsyncCause) override
-    {
-      Entry(aCx, nullptr, aScript, aAsyncStack, aAsyncCause);
-    }
-
-    void Exit(JSContext* aCx) override;
-
-  private:
-    void Entry(JSContext* aCx, JSFunction* aFunction, JSScript* aScript,
-               JS::Handle<JS::Value> aAsyncStack,
-               const char* aAsyncCause);
-
-    const char* mReason;
-  };
-
-  // It's safe to make this a weak pointer, since it's the subject principal
-  // when we go on the stack, so can't go away until after we're gone.  In
-  // particular, this is only used from the CallSetup constructor, and only in
-  // the aIsJSImplementedWebIDL case.  And in that case, the subject principal
-  // is the principal of the callee function that is part of the CallArgs just a
-  // bit up the stack, and which will outlive us.  So we know the principal
-  // can't go away until then either.
-  nsIPrincipal* MOZ_NON_OWNING_REF mWebIDLCallerPrincipal;
-  friend nsIPrincipal* GetWebIDLCallerPrincipal();
-
-  Maybe<DocshellEntryMonitor> mDocShellEntryMonitor;
-};
-
-/*
- * A class that can be used to force a particular incumbent script on the stack.
- */
-class AutoIncumbentScript : protected ScriptSettingsStackEntry {
-public:
-  explicit AutoIncumbentScript(nsIGlobalObject* aGlobalObject);
-  ~AutoIncumbentScript();
-
-private:
-  JS::AutoHideScriptedCaller mCallerOverride;
-};
-
-/*
- * A class to put the JS engine in an unusable state. The subject principal
- * will become System, the information on the script settings stack is
- * rendered inaccessible, and JSAPI may not be manipulated until the class is
- * either popped or an AutoJSAPI instance is subsequently pushed.
- *
- * This class may not be instantiated if an exception is pending.
- */
-class AutoNoJSAPI : protected ScriptSettingsStackEntry {
-public:
-  explicit AutoNoJSAPI();
-  ~AutoNoJSAPI();
-};
-
-} // namespace dom
-
-/**
- * Use AutoJSContext when you need a JS context on the stack but don't have one
- * passed as a parameter. AutoJSContext will take care of finding the most
- * appropriate JS context and release it when leaving the stack.
- */
-class MOZ_RAII AutoJSContext {
-public:
-  explicit AutoJSContext(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM);
-  operator JSContext*() const;
-
-protected:
-  JSContext* mCx;
-  dom::AutoJSAPI mJSAPI;
-  MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
-};
-
-/**
- * AutoSafeJSContext is similar to AutoJSContext but will only return the safe
- * JS context. That means it will never call nsContentUtils::GetCurrentJSContext().
- *
- * Note - This is deprecated. Please use AutoJSAPI instead.
- */
-class MOZ_RAII AutoSafeJSContext : public dom::AutoJSAPI {
-public:
-  explicit AutoSafeJSContext(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM);
-  operator JSContext*() const
-  {
-    return cx();
-  }
-
-private:
-  MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
-};
-
-/**
- * Use AutoSlowOperation when native side calls many JS callbacks in a row
- * and slow script dialog should be activated if too much time is spent going
- * through those callbacks.
- * AutoSlowOperation puts a JSAutoRequest on the stack so that we don't continue
- * to reset the watchdog and CheckForInterrupt can be then used to check whether
- * JS execution should be interrupted.
- */
-class MOZ_RAII AutoSlowOperation : public dom::AutoJSAPI
-{
-public:
-  explicit AutoSlowOperation(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM);
-  void CheckForInterrupt();
-private:
-  MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
-};
-
-} // namespace mozilla
-
-#endif // mozilla_dom_ScriptSettings_h
diff --git a/dom/base/moz.build b/dom/base/moz.build
index 89f1785ca..aadafe412 100755
--- a/dom/base/moz.build
+++ b/dom/base/moz.build
@@ -26,7 +26,6 @@ XPIDL_SOURCES += [
     'nsIObjectLoadingContent.idl',
     'nsIRemoteWindowContext.idl',
     'nsIScriptChannel.idl',
-    'nsIScriptLoaderObserver.idl',
     'nsISelection.idl',
     'nsISelectionController.idl',
     'nsISelectionDisplay.idl',
@@ -96,7 +95,6 @@ EXPORTS += [
     'nsINode.h',
     'nsINodeList.h',
     'nsIScriptContext.h',
-    'nsIScriptElement.h',
     'nsIScriptGlobalObject.h',
     'nsIScriptNameSpaceManager.h',
     'nsIScriptObjectPrincipal.h',
@@ -117,7 +115,6 @@ EXPORTS += [
     'nsRange.h',
     'nsReferencedElement.h',
     'nsSandboxFlags.h',
-    'nsScriptLoader.h',
     'nsStructuredCloneContainer.h',
     'nsStubAnimationObserver.h',
     'nsStubDocumentObserver.h',
@@ -208,7 +205,6 @@ EXPORTS.mozilla.dom += [
     'ResponsiveImageSelector.h',
     'SameProcessMessageQueue.h',
     'ScreenOrientation.h',
-    'ScriptSettings.h',
     'ShadowRoot.h',
     'SimpleTreeIterator.h',
     'StructuredCloneHolder.h',
@@ -328,8 +324,6 @@ SOURCES += [
     'nsRange.cpp',
     'nsReferencedElement.cpp',
     'nsScreen.cpp',
-    'nsScriptElement.cpp',
-    'nsScriptLoader.cpp',
     'nsScriptNameSpaceManager.cpp',
     'nsStructuredCloneContainer.cpp',
     'nsStubAnimationObserver.cpp',
@@ -356,7 +350,6 @@ SOURCES += [
     'ResponsiveImageSelector.cpp',
     'SameProcessMessageQueue.cpp',
     'ScreenOrientation.cpp',
-    'ScriptSettings.cpp',
     'ShadowRoot.cpp',
     'StructuredCloneHolder.cpp',
     'StyleSheetList.cpp',
diff --git a/dom/base/nsContentPermissionHelper.cpp b/dom/base/nsContentPermissionHelper.cpp
index c57fc6233..eaaec2a41 100644
--- a/dom/base/nsContentPermissionHelper.cpp
+++ b/dom/base/nsContentPermissionHelper.cpp
@@ -29,9 +29,8 @@
 #include "nsIDocument.h"
 #include "nsIDOMEvent.h"
 #include "nsWeakPtr.h"
-#include "ScriptSettings.h"
 
-using mozilla::Unused;          // <snicker>
+using mozilla::Unused;
 using namespace mozilla::dom;
 using namespace mozilla;
 
diff --git a/dom/base/nsContentSink.cpp b/dom/base/nsContentSink.cpp
index 490f0ec17..1e6465a1b 100644
--- a/dom/base/nsContentSink.cpp
+++ b/dom/base/nsContentSink.cpp
@@ -10,7 +10,6 @@
  */
 
 #include "nsContentSink.h"
-#include "nsScriptLoader.h"
 #include "nsIDocument.h"
 #include "nsIDOMDocument.h"
 #include "mozilla/css/Loader.h"
@@ -49,6 +48,7 @@
 #include "nsHTMLDNSPrefetch.h"
 #include "nsIObserverService.h"
 #include "mozilla/Preferences.h"
+#include "mozilla/dom/ScriptLoader.h"
 #include "nsParserConstants.h"
 #include "nsSandboxFlags.h"
 
diff --git a/dom/base/nsContentSink.h b/dom/base/nsContentSink.h
index b1a758874..2d914a8d7 100644
--- a/dom/base/nsContentSink.h
+++ b/dom/base/nsContentSink.h
@@ -36,13 +36,16 @@ class nsIAtom;
 class nsIChannel;
 class nsIContent;
 class nsNodeInfoManager;
-class nsScriptLoader;
 class nsIApplicationCache;
 
 namespace mozilla {
 namespace css {
 class Loader;
 } // namespace css
+
+namespace dom {
+class ScriptLoader;
+} // namespace dom
 } // namespace mozilla
 
 #ifdef DEBUG
@@ -273,7 +276,7 @@ protected:
   nsCOMPtr<nsIDocShell>         mDocShell;
   RefPtr<mozilla::css::Loader> mCSSLoader;
   RefPtr<nsNodeInfoManager>   mNodeInfoManager;
-  RefPtr<nsScriptLoader>      mScriptLoader;
+  RefPtr<mozilla::dom::ScriptLoader> mScriptLoader;
 
   // back off timer notification after count
   int32_t mBackoffCount;
diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index 81e2783a4..d0634b0f9 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -1880,7 +1880,7 @@ nsDocument::Init()
   mScopeObject = do_GetWeakReference(global);
   MOZ_ASSERT(mScopeObject);
 
-  mScriptLoader = new nsScriptLoader(this);
+  mScriptLoader = new dom::ScriptLoader(this);
 
   mozilla::HoldJSObjects(this);
 
@@ -4685,7 +4685,7 @@ nsDocument::GetWindowInternal() const
   return win;
 }
 
-nsScriptLoader*
+ScriptLoader*
 nsDocument::ScriptLoader()
 {
   return mScriptLoader;
diff --git a/dom/base/nsDocument.h b/dom/base/nsDocument.h
index 8ea4993f0..a319ad13e 100644
--- a/dom/base/nsDocument.h
+++ b/dom/base/nsDocument.h
@@ -31,7 +31,6 @@
 #include "nsJSThingHashtable.h"
 #include "nsIScriptObjectPrincipal.h"
 #include "nsIURI.h"
-#include "nsScriptLoader.h"
 #include "nsIRadioGroupContainer.h"
 #include "nsILayoutHistoryState.h"
 #include "nsIRequest.h"
@@ -60,6 +59,7 @@
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/PendingAnimationTracker.h"
 #include "mozilla/dom/DOMImplementation.h"
+#include "mozilla/dom/ScriptLoader.h"
 #include "mozilla/dom/StyleSheetList.h"
 #include "nsDataHashtable.h"
 #include "mozilla/TimeStamp.h"
@@ -674,7 +674,7 @@ public:
   /**
    * Get the script loader for this document
    */
-  virtual nsScriptLoader* ScriptLoader() override;
+  virtual mozilla::dom::ScriptLoader* ScriptLoader() override;
 
   /**
    * Add/Remove an element to the document's id and name hashes
@@ -1417,7 +1417,7 @@ public:
   RefPtr<mozilla::EventListenerManager> mListenerManager;
   RefPtr<mozilla::dom::StyleSheetList> mDOMStyleSheets;
   RefPtr<nsDOMStyleSheetSetList> mStyleSheetSetList;
-  RefPtr<nsScriptLoader> mScriptLoader;
+  RefPtr<mozilla::dom::ScriptLoader> mScriptLoader;
   nsDocHeaderData* mHeaderData;
   /* mIdentifierMap works as follows for IDs:
    * 1) Attribute changes affect the table immediately (removing and adding
diff --git a/dom/base/nsFrameMessageManager.cpp b/dom/base/nsFrameMessageManager.cpp
index bba4232aa..331931f19 100644
--- a/dom/base/nsFrameMessageManager.cpp
+++ b/dom/base/nsFrameMessageManager.cpp
@@ -19,7 +19,6 @@
 #include "nsJSUtils.h"
 #include "nsJSPrincipals.h"
 #include "nsNetUtil.h"
-#include "nsScriptLoader.h"
 #include "nsFrameLoader.h"
 #include "nsIXULRuntime.h"
 #include "nsIScriptError.h"
@@ -38,6 +37,7 @@
 #include "mozilla/dom/PermissionMessageUtils.h"
 #include "mozilla/dom/ProcessGlobal.h"
 #include "mozilla/dom/SameProcessMessageQueue.h"
+#include "mozilla/dom/ScriptLoader.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/dom/ipc/BlobChild.h"
 #include "mozilla/dom/ipc/BlobParent.h"
@@ -1786,9 +1786,9 @@ nsMessageManagerScriptExecutor::TryCacheLoadAndCompileScript(
     if (NS_FAILED(NS_ReadInputStreamToString(input, buffer, avail))) {
       return;
     }
-    nsScriptLoader::ConvertToUTF16(channel, (uint8_t*)buffer.get(), avail,
-                                   EmptyString(), nullptr,
-                                   dataStringBuf, dataStringLength);
+    ScriptLoader::ConvertToUTF16(channel, (uint8_t*)buffer.get(), avail,
+                                 EmptyString(), nullptr,
+                                 dataStringBuf, dataStringLength);
   }
 
   JS::SourceBufferHolder srcBuf(dataStringBuf, dataStringLength,
diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index dd1fe4586..d696d826b 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -62,7 +62,7 @@
 #include "nsReadableUtils.h"
 #include "nsDOMClassInfo.h"
 #include "nsJSEnvironment.h"
-#include "ScriptSettings.h"
+#include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/Likely.h"
 #include "mozilla/Sprintf.h"
diff --git a/dom/base/nsIDocument.h b/dom/base/nsIDocument.h
index fdaee39ca..506acc7e4 100644
--- a/dom/base/nsIDocument.h
+++ b/dom/base/nsIDocument.h
@@ -91,7 +91,6 @@ class nsIVariant;
 class nsViewManager;
 class nsPresContext;
 class nsRange;
-class nsScriptLoader;
 class nsSMILAnimationController;
 class nsTextNode;
 class nsWindowSizes;
@@ -152,6 +151,7 @@ enum class OrientationType : uint32_t;
 class ProcessingInstruction;
 class Promise;
 class Selection;
+class ScriptLoader;
 class StyleSheetList;
 class SVGDocument;
 class SVGSVGElement;
@@ -1290,7 +1290,7 @@ public:
   /**
    * Get the script loader for this document
    */
-  virtual nsScriptLoader* ScriptLoader() = 0;
+  virtual mozilla::dom::ScriptLoader* ScriptLoader() = 0;
 
   /**
    * Add/Remove an element to the document's id and name hashes
diff --git a/dom/base/nsIScriptElement.h b/dom/base/nsIScriptElement.h
deleted file mode 100644
index 470d51c94..000000000
--- a/dom/base/nsIScriptElement.h
+++ /dev/null
@@ -1,329 +0,0 @@
-/* -*- 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 nsIScriptElement_h___
-#define nsIScriptElement_h___
-
-#include "nsISupports.h"
-#include "nsIURI.h"
-#include "nsCOMPtr.h"
-#include "nsIScriptLoaderObserver.h"
-#include "nsWeakPtr.h"
-#include "nsIParser.h"
-#include "nsContentCreatorFunctions.h"
-#include "nsIDOMHTMLScriptElement.h"
-#include "mozilla/CORSMode.h"
-
-#define NS_ISCRIPTELEMENT_IID \
-{ 0xe60fca9b, 0x1b96, 0x4e4e, \
- { 0xa9, 0xb4, 0xdc, 0x98, 0x4f, 0x88, 0x3f, 0x9c } }
-
-/**
- * Internal interface implemented by script elements
- */
-class nsIScriptElement : public nsIScriptLoaderObserver {
-public:
-  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCRIPTELEMENT_IID)
-
-  explicit nsIScriptElement(mozilla::dom::FromParser aFromParser)
-    : mLineNumber(1),
-      mAlreadyStarted(false),
-      mMalformed(false),
-      mDoneAddingChildren(aFromParser == mozilla::dom::NOT_FROM_PARSER ||
-                          aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT),
-      mForceAsync(aFromParser == mozilla::dom::NOT_FROM_PARSER ||
-                  aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT),
-      mFrozen(false),
-      mDefer(false),
-      mAsync(false),
-      mExternal(false),
-      mParserCreated(aFromParser == mozilla::dom::FROM_PARSER_FRAGMENT ?
-                     mozilla::dom::NOT_FROM_PARSER : aFromParser),
-                     // Fragment parser-created scripts (if executable)
-                     // behave like script-created scripts.
-      mCreatorParser(nullptr)
-  {
-  }
-
-  /**
-   * Content type identifying the scripting language. Can be empty, in
-   * which case javascript will be assumed.
-   * Return false if type attribute is not found.
-   */
-  virtual bool GetScriptType(nsAString& type) = 0;
-
-  /**
-   * Location of script source text. Can return null, in which case
-   * this is assumed to be an inline script element.
-   */
-  nsIURI* GetScriptURI()
-  {
-    NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
-    return mUri;
-  }
-
-  /**
-   * Script source text for inline script elements.
-   */
-  virtual void GetScriptText(nsAString& text) = 0;
-
-  virtual void GetScriptCharset(nsAString& charset) = 0;
-
-  /**
-   * Freezes the return values of GetScriptDeferred(), GetScriptAsync() and
-   * GetScriptURI() so that subsequent modifications to the attributes don't
-   * change execution behavior.
-   */
-  virtual void FreezeUriAsyncDefer() = 0;
-
-  /**
-   * Is the script deferred. Currently only supported by HTML scripts.
-   */
-  bool GetScriptDeferred()
-  {
-    NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
-    return mDefer;
-  }
-
-  /**
-   * Is the script async. Currently only supported by HTML scripts.
-   */
-  bool GetScriptAsync()
-  {
-    NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
-    return mAsync;
-  }
-
-  /**
-   * Is the script an external script?
-   */
-  bool GetScriptExternal()
-  {
-    NS_PRECONDITION(mFrozen, "Not ready for this call yet!");
-    return mExternal;
-  }
-
-  /**
-   * Returns how the element was created.
-   */
-  mozilla::dom::FromParser GetParserCreated()
-  {
-    return mParserCreated;
-  }
-
-  void SetScriptLineNumber(uint32_t aLineNumber)
-  {
-    mLineNumber = aLineNumber;
-  }
-  uint32_t GetScriptLineNumber()
-  {
-    return mLineNumber;
-  }
-
-  void SetIsMalformed()
-  {
-    mMalformed = true;
-  }
-  bool IsMalformed()
-  {
-    return mMalformed;
-  }
-
-  void PreventExecution()
-  {
-    mAlreadyStarted = true;
-  }
-
-  void LoseParserInsertedness()
-  {
-    mFrozen = false;
-    mUri = nullptr;
-    mCreatorParser = nullptr;
-    mParserCreated = mozilla::dom::NOT_FROM_PARSER;
-    bool async = false;
-    nsCOMPtr<nsIDOMHTMLScriptElement> htmlScript = do_QueryInterface(this);
-    if (htmlScript) {
-      htmlScript->GetAsync(&async);
-    }
-    mForceAsync = !async;
-  }
-
-  void SetCreatorParser(nsIParser* aParser)
-  {
-    mCreatorParser = do_GetWeakReference(aParser);
-  }
-
-  /**
-   * Unblocks the creator parser
-   */
-  void UnblockParser()
-  {
-    nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
-    if (parser) {
-      parser->UnblockParser();
-    }
-  }
-
-  /**
-   * Attempts to resume parsing asynchronously
-   */
-  void ContinueParserAsync()
-  {
-    nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
-    if (parser) {
-      parser->ContinueInterruptedParsingAsync();
-    }
-  }
-
-  /**
-   * Informs the creator parser that the evaluation of this script is starting
-   */
-  void BeginEvaluating()
-  {
-    nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
-    if (parser) {
-      parser->PushDefinedInsertionPoint();
-    }
-  }
-
-  /**
-   * Informs the creator parser that the evaluation of this script is ending
-   */
-  void EndEvaluating()
-  {
-    nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
-    if (parser) {
-      parser->PopDefinedInsertionPoint();
-    }
-  }
-
-  /**
-   * Retrieves a pointer to the creator parser if this has one or null if not
-   */
-  already_AddRefed<nsIParser> GetCreatorParser()
-  {
-    nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
-    return parser.forget();
-  }
-
-  /**
-   * This method is called when the parser finishes creating the script
-   * element's children, if any are present.
-   *
-   * @return whether the parser will be blocked while this script is being
-   *         loaded
-   */
-  bool AttemptToExecute()
-  {
-    mDoneAddingChildren = true;
-    bool block = MaybeProcessScript();
-    if (!mAlreadyStarted) {
-      // Need to lose parser-insertedness here to allow another script to cause
-      // execution later.
-      LoseParserInsertedness();
-    }
-    return block;
-  }
-
-  /**
-   * Get the CORS mode of the script element
-   */
-  virtual mozilla::CORSMode GetCORSMode() const
-  {
-    /* Default to no CORS */
-    return mozilla::CORS_NONE;
-  }
-
-  /**
-   * Fire an error event
-   */
-  virtual nsresult FireErrorEvent() = 0;
-
-protected:
-  /**
-   * Processes the script if it's in the document-tree and links to or
-   * contains a script. Once it has been evaluated there is no way to make it
-   * reevaluate the script, you'll have to create a new element. This also means
-   * that when adding a src attribute to an element that already contains an
-   * inline script, the script referenced by the src attribute will not be
-   * loaded.
-   *
-   * In order to be able to use multiple childNodes, or to use the
-   * fallback mechanism of using both inline script and linked script you have
-   * to add all attributes and childNodes before adding the element to the
-   * document-tree.
-   *
-   * @return whether the parser will be blocked while this script is being
-   *         loaded
-   */
-  virtual bool MaybeProcessScript() = 0;
-
-  /**
-   * The start line number of the script.
-   */
-  uint32_t mLineNumber;
-
-  /**
-   * The "already started" flag per HTML5.
-   */
-  bool mAlreadyStarted;
-
-  /**
-   * The script didn't have an end tag.
-   */
-  bool mMalformed;
-
-  /**
-   * False if parser-inserted but the parser hasn't triggered running yet.
-   */
-  bool mDoneAddingChildren;
-
-  /**
-   * If true, the .async property returns true instead of reflecting the
-   * content attribute.
-   */
-  bool mForceAsync;
-
-  /**
-   * Whether src, defer and async are frozen.
-   */
-  bool mFrozen;
-
-  /**
-   * The effective deferredness.
-   */
-  bool mDefer;
-
-  /**
-   * The effective asyncness.
-   */
-  bool mAsync;
-
-  /**
-   * The effective externalness. A script can be external with mUri being null
-   * if the src attribute contained an invalid URL string.
-   */
-  bool mExternal;
-
-  /**
-   * Whether this element was parser-created.
-   */
-  mozilla::dom::FromParser mParserCreated;
-
-  /**
-   * The effective src (or null if no src).
-   */
-  nsCOMPtr<nsIURI> mUri;
-
-  /**
-   * The creator parser of a non-defer, non-async parser-inserted script.
-   */
-  nsWeakPtr mCreatorParser;
-};
-
-NS_DEFINE_STATIC_IID_ACCESSOR(nsIScriptElement, NS_ISCRIPTELEMENT_IID)
-
-#endif // nsIScriptElement_h___
diff --git a/dom/base/nsIScriptLoaderObserver.idl b/dom/base/nsIScriptLoaderObserver.idl
deleted file mode 100644
index ed7196525..000000000
--- a/dom/base/nsIScriptLoaderObserver.idl
+++ /dev/null
@@ -1,47 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* 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 "nsISupports.idl"
-
-interface nsIScriptElement;
-interface nsIURI;
-
-[scriptable, uuid(7b787204-76fb-4764-96f1-fb7a666db4f4)]
-interface nsIScriptLoaderObserver : nsISupports {
-  
-  /**
-   * The script is available for evaluation. For inline scripts, this
-   * method will be called synchronously. For externally loaded scripts,
-   * this method will be called when the load completes.
-   *
-   * @param aResult A result code representing the result of loading
-   *        a script. If this is a failure code, script evaluation
-   *        will not occur.
-   * @param aElement The element being processed.
-   * @param aIsInline Is this an inline script or externally loaded?
-   * @param aURI What is the URI of the script (the document URI if
-   *        it is inline).
-   * @param aLineNo At what line does the script appear (generally 1
-   *        if it is a loaded script).
-   */
-  void scriptAvailable(in nsresult aResult, 
-                       in nsIScriptElement aElement,
-                       in boolean aIsInline,
-                       in nsIURI aURI,
-                       in int32_t aLineNo);
-
-  /**
-   * The script has been evaluated.
-   *
-   * @param aResult A result code representing the success or failure of
-   *        the script evaluation.
-   * @param aElement The element being processed.
-   * @param aIsInline Is this an inline script or externally loaded?
-   */
-  void scriptEvaluated(in nsresult aResult, 
-                       in nsIScriptElement aElement,
-                       in boolean aIsInline);
-		       
-};
diff --git a/dom/base/nsInProcessTabChildGlobal.cpp b/dom/base/nsInProcessTabChildGlobal.cpp
index 10ccf4aec..2e129f9f0 100644
--- a/dom/base/nsInProcessTabChildGlobal.cpp
+++ b/dom/base/nsInProcessTabChildGlobal.cpp
@@ -11,13 +11,13 @@
 #include "nsIComponentManager.h"
 #include "nsIServiceManager.h"
 #include "nsComponentManagerUtils.h"
-#include "nsScriptLoader.h"
 #include "nsFrameLoader.h"
 #include "xpcpublic.h"
 #include "nsIMozBrowserFrame.h"
 #include "nsDOMClassInfoID.h"
 #include "mozilla/EventDispatcher.h"
 #include "mozilla/dom/SameProcessMessageQueue.h"
+#include "mozilla/dom/ScriptLoader.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
diff --git a/dom/base/nsJSEnvironment.cpp b/dom/base/nsJSEnvironment.cpp
index efea3ee40..605b1917f 100644
--- a/dom/base/nsJSEnvironment.cpp
+++ b/dom/base/nsJSEnvironment.cpp
@@ -37,7 +37,6 @@
 #include "nsXPCOMCIDInternal.h"
 #include "nsIXULRuntime.h"
 #include "nsTextFormatter.h"
-#include "ScriptSettings.h"
 
 #include "xpcpublic.h"
 
@@ -55,6 +54,7 @@
 #include "mozilla/dom/DOMException.h"
 #include "mozilla/dom/DOMExceptionBinding.h"
 #include "mozilla/dom/ErrorEvent.h"
+#include "mozilla/dom/ScriptSettings.h"
 #include "nsAXPCNativeCallContext.h"
 #include "mozilla/CycleCollectedJSContext.h"
 #include "mozilla/Telemetry.h"
diff --git a/dom/base/nsScriptElement.cpp b/dom/base/nsScriptElement.cpp
deleted file mode 100644
index ebeb18f81..000000000
--- a/dom/base/nsScriptElement.cpp
+++ /dev/null
@@ -1,150 +0,0 @@
-/* -*- 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 "nsScriptElement.h"
-#include "mozilla/BasicEvents.h"
-#include "mozilla/EventDispatcher.h"
-#include "mozilla/dom/Element.h"
-#include "nsContentUtils.h"
-#include "nsPresContext.h"
-#include "nsScriptLoader.h"
-#include "nsIParser.h"
-#include "nsGkAtoms.h"
-#include "nsContentSink.h"
-
-using namespace mozilla;
-using namespace mozilla::dom;
-
-NS_IMETHODIMP
-nsScriptElement::ScriptAvailable(nsresult aResult,
-                                 nsIScriptElement *aElement,
-                                 bool aIsInline,
-                                 nsIURI *aURI,
-                                 int32_t aLineNo)
-{
-  if (!aIsInline && NS_FAILED(aResult)) {
-    nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
-    if (parser) {
-      parser->PushDefinedInsertionPoint();
-    }
-    nsresult rv = FireErrorEvent();
-    if (parser) {
-      parser->PopDefinedInsertionPoint();
-    }
-    return rv;
-  }
-  return NS_OK;
-}
-
-/* virtual */ nsresult
-nsScriptElement::FireErrorEvent()
-{
-  nsCOMPtr<nsIContent> cont =
-    do_QueryInterface((nsIScriptElement*) this);
-
-  return nsContentUtils::DispatchTrustedEvent(cont->OwnerDoc(),
-                                              cont,
-                                              NS_LITERAL_STRING("error"),
-                                              false /* bubbles */,
-                                              false /* cancelable */);
-}
-
-NS_IMETHODIMP
-nsScriptElement::ScriptEvaluated(nsresult aResult,
-                                 nsIScriptElement *aElement,
-                                 bool aIsInline)
-{
-  nsresult rv = NS_OK;
-  if (!aIsInline) {
-    nsCOMPtr<nsIContent> cont =
-      do_QueryInterface((nsIScriptElement*) this);
-
-    RefPtr<nsPresContext> presContext =
-      nsContentUtils::GetContextForContent(cont);
-
-    nsEventStatus status = nsEventStatus_eIgnore;
-    EventMessage message = NS_SUCCEEDED(aResult) ? eLoad : eLoadError;
-    WidgetEvent event(true, message);
-    // Load event doesn't bubble.
-    event.mFlags.mBubbles = (message != eLoad);
-
-    EventDispatcher::Dispatch(cont, presContext, &event, nullptr, &status);
-  }
-
-  return rv;
-}
-
-void
-nsScriptElement::CharacterDataChanged(nsIDocument *aDocument,
-                                      nsIContent* aContent,
-                                      CharacterDataChangeInfo* aInfo)
-{
-  MaybeProcessScript();
-}
-
-void
-nsScriptElement::AttributeChanged(nsIDocument* aDocument,
-                                  Element* aElement,
-                                  int32_t aNameSpaceID,
-                                  nsIAtom* aAttribute,
-                                  int32_t aModType,
-                                  const nsAttrValue* aOldValue)
-{
-  MaybeProcessScript();
-}
-
-void
-nsScriptElement::ContentAppended(nsIDocument* aDocument,
-                                 nsIContent* aContainer,
-                                 nsIContent* aFirstNewContent,
-                                 int32_t aNewIndexInContainer)
-{
-  MaybeProcessScript();
-}
-
-void
-nsScriptElement::ContentInserted(nsIDocument *aDocument,
-                                 nsIContent* aContainer,
-                                 nsIContent* aChild,
-                                 int32_t aIndexInContainer)
-{
-  MaybeProcessScript();
-}
-
-bool
-nsScriptElement::MaybeProcessScript()
-{
-  nsCOMPtr<nsIContent> cont =
-    do_QueryInterface((nsIScriptElement*) this);
-
-  NS_ASSERTION(cont->DebugGetSlots()->mMutationObservers.Contains(this),
-               "You forgot to add self as observer");
-
-  if (mAlreadyStarted || !mDoneAddingChildren ||
-      !cont->GetComposedDoc() || mMalformed || !HasScriptContent()) {
-    return false;
-  }
-
-  FreezeUriAsyncDefer();
-
-  mAlreadyStarted = true;
-
-  nsIDocument* ownerDoc = cont->OwnerDoc();
-  nsCOMPtr<nsIParser> parser = ((nsIScriptElement*) this)->GetCreatorParser();
-  if (parser) {
-    nsCOMPtr<nsIContentSink> sink = parser->GetContentSink();
-    if (sink) {
-      nsCOMPtr<nsIDocument> parserDoc = do_QueryInterface(sink->GetTarget());
-      if (ownerDoc != parserDoc) {
-        // Willful violation of HTML5 as of 2010-12-01
-        return false;
-      }
-    }
-  }
-
-  RefPtr<nsScriptLoader> loader = ownerDoc->ScriptLoader();
-  return loader->ProcessScriptElement(this);
-}
diff --git a/dom/base/nsScriptElement.h b/dom/base/nsScriptElement.h
deleted file mode 100644
index 4a2a584ac..000000000
--- a/dom/base/nsScriptElement.h
+++ /dev/null
@@ -1,52 +0,0 @@
-/* -*- 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 nsScriptElement_h
-#define nsScriptElement_h
-
-#include "mozilla/Attributes.h"
-#include "nsIScriptLoaderObserver.h"
-#include "nsIScriptElement.h"
-#include "nsStubMutationObserver.h"
-
-/**
- * Baseclass useful for script elements (such as <xhtml:script> and
- * <svg:script>). Currently the class assumes that only the 'src'
- * attribute and the children of the class affect what script to execute.
- */
-
-class nsScriptElement : public nsIScriptElement,
-                        public nsStubMutationObserver
-{
-public:
-  // nsIScriptLoaderObserver
-  NS_DECL_NSISCRIPTLOADEROBSERVER
-
-  // nsIMutationObserver
-  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
-  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
-  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
-  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
-
-  explicit nsScriptElement(mozilla::dom::FromParser aFromParser)
-    : nsIScriptElement(aFromParser)
-  {
-  }
-
-  virtual nsresult FireErrorEvent() override;
-
-protected:
-  // Internal methods
-
-  /**
-   * Check if this element contains any script, linked or inline
-   */
-  virtual bool HasScriptContent() = 0;
-
-  virtual bool MaybeProcessScript() override;
-};
-
-#endif // nsScriptElement_h
diff --git a/dom/base/nsScriptLoader.cpp b/dom/base/nsScriptLoader.cpp
deleted file mode 100644
index 25482fe7b..000000000
--- a/dom/base/nsScriptLoader.cpp
+++ /dev/null
@@ -1,3061 +0,0 @@
-/* -*- 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/. */
-
-/*
- * A class that handles loading and evaluation of <script> elements.
- */
-
-#include "nsScriptLoader.h"
-
-#include "prsystem.h"
-#include "jsapi.h"
-#include "jsfriendapi.h"
-#include "xpcpublic.h"
-#include "nsCycleCollectionParticipant.h"
-#include "nsIContent.h"
-#include "nsJSUtils.h"
-#include "mozilla/dom/ScriptSettings.h"
-#include "mozilla/dom/Element.h"
-#include "mozilla/dom/SRILogHelper.h"
-#include "nsGkAtoms.h"
-#include "nsNetUtil.h"
-#include "nsIScriptGlobalObject.h"
-#include "nsIScriptContext.h"
-#include "nsIScriptSecurityManager.h"
-#include "nsIPrincipal.h"
-#include "nsJSPrincipals.h"
-#include "nsContentPolicyUtils.h"
-#include "nsIHttpChannel.h"
-#include "nsIHttpChannelInternal.h"
-#include "nsIClassOfService.h"
-#include "nsITimedChannel.h"
-#include "nsIScriptElement.h"
-#include "nsIDOMHTMLScriptElement.h"
-#include "nsIDocShell.h"
-#include "nsContentUtils.h"
-#include "nsUnicharUtils.h"
-#include "nsAutoPtr.h"
-#include "nsIXPConnect.h"
-#include "nsError.h"
-#include "nsThreadUtils.h"
-#include "nsDocShellCID.h"
-#include "nsIContentSecurityPolicy.h"
-#include "mozilla/Logging.h"
-#include "nsCRT.h"
-#include "nsContentCreatorFunctions.h"
-#include "nsProxyRelease.h"
-#include "nsSandboxFlags.h"
-#include "nsContentTypeParser.h"
-#include "nsINetworkPredictor.h"
-#include "ImportManager.h"
-#include "mozilla/dom/EncodingUtils.h"
-#include "mozilla/ConsoleReportCollector.h"
-
-#include "mozilla/Attributes.h"
-#include "mozilla/Unused.h"
-#include "nsIScriptError.h"
-
-using namespace mozilla;
-using namespace mozilla::dom;
-
-using JS::SourceBufferHolder;
-
-static LazyLogModule gCspPRLog("CSP");
-
-void
-ImplCycleCollectionUnlink(nsScriptLoadRequestList& aField);
-
-void
-ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
-                            nsScriptLoadRequestList& aField,
-                            const char* aName,
-                            uint32_t aFlags = 0);
-
-//////////////////////////////////////////////////////////////
-// nsScriptLoadRequest
-//////////////////////////////////////////////////////////////
-
-NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsScriptLoadRequest)
-NS_INTERFACE_MAP_END
-
-NS_IMPL_CYCLE_COLLECTING_ADDREF(nsScriptLoadRequest)
-NS_IMPL_CYCLE_COLLECTING_RELEASE(nsScriptLoadRequest)
-
-NS_IMPL_CYCLE_COLLECTION_CLASS(nsScriptLoadRequest)
-
-NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsScriptLoadRequest)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mElement)
-NS_IMPL_CYCLE_COLLECTION_UNLINK_END
-
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsScriptLoadRequest)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
-
-nsScriptLoadRequest::~nsScriptLoadRequest()
-{
-  js_free(mScriptTextBuf);
-
-  // We should always clean up any off-thread script parsing resources.
-  MOZ_ASSERT(!mOffThreadToken);
-
-  // But play it safe in release builds and try to clean them up here
-  // as a fail safe.
-  MaybeCancelOffThreadScript();
-}
-
-void
-nsScriptLoadRequest::SetReady()
-{
-  MOZ_ASSERT(mProgress != Progress::Ready);
-  mProgress = Progress::Ready;
-}
-
-void
-nsScriptLoadRequest::Cancel()
-{
-  MaybeCancelOffThreadScript();
-  mIsCanceled = true;
-}
-
-void
-nsScriptLoadRequest::MaybeCancelOffThreadScript()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-
-  if (!mOffThreadToken) {
-    return;
-  }
-
-  JSContext* cx = danger::GetJSContext();
-  JS::CancelOffThreadScript(cx, mOffThreadToken);
-  mOffThreadToken = nullptr;
-}
-
-//////////////////////////////////////////////////////////////
-// nsModuleLoadRequest
-//////////////////////////////////////////////////////////////
-
-// A load request for a module, created for every top level module script and
-// every module import.  Load request can share an nsModuleScript if there are
-// multiple imports of the same module.
-
-class nsModuleLoadRequest final : public nsScriptLoadRequest
-{
-  ~nsModuleLoadRequest() {}
-
-  nsModuleLoadRequest(const nsModuleLoadRequest& aOther) = delete;
-  nsModuleLoadRequest(nsModuleLoadRequest&& aOther) = delete;
-
-public:
-  NS_DECL_ISUPPORTS_INHERITED
-  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsModuleLoadRequest, nsScriptLoadRequest)
-
-  nsModuleLoadRequest(nsIScriptElement* aElement,
-                      uint32_t aVersion,
-                      CORSMode aCORSMode,
-                      const SRIMetadata& aIntegrity,
-                      nsScriptLoader* aLoader);
-
-  bool IsTopLevel() const {
-    return mIsTopLevel;
-  }
-
-  void SetReady() override;
-  void Cancel() override;
-
-  void ModuleLoaded();
-  void DependenciesLoaded();
-  void LoadFailed();
-
-  // Is this a request for a top level module script or an import?
-  bool mIsTopLevel;
-
-  // The base URL used for resolving relative module imports.
-  nsCOMPtr<nsIURI> mBaseURL;
-
-  // Pointer to the script loader, used to trigger actions when the module load
-  // finishes.
-  RefPtr<nsScriptLoader> mLoader;
-
-  // The importing module, or nullptr for top level module scripts.  Used to
-  // implement the ancestor list checked when fetching module dependencies.
-  RefPtr<nsModuleLoadRequest> mParent;
-
-  // Set to a module script object after a successful load or nullptr on
-  // failure.
-  RefPtr<nsModuleScript> mModuleScript;
-
-  // A promise that is completed on successful load of this module and all of
-  // its dependencies, indicating that the module is ready for instantiation and
-  // evaluation.
-  MozPromiseHolder<GenericPromise> mReady;
-
-  // Array of imported modules.
-  nsTArray<RefPtr<nsModuleLoadRequest>> mImports;
-};
-
-NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(nsModuleLoadRequest)
-NS_INTERFACE_MAP_END_INHERITING(nsScriptLoadRequest)
-
-NS_IMPL_CYCLE_COLLECTION_INHERITED(nsModuleLoadRequest, nsScriptLoadRequest,
-                                   mBaseURL,
-                                   mLoader,
-                                   mParent,
-                                   mModuleScript,
-                                   mImports)
-
-NS_IMPL_ADDREF_INHERITED(nsModuleLoadRequest, nsScriptLoadRequest)
-NS_IMPL_RELEASE_INHERITED(nsModuleLoadRequest, nsScriptLoadRequest)
-
-nsModuleLoadRequest::nsModuleLoadRequest(nsIScriptElement* aElement,
-                                         uint32_t aVersion,
-                                         CORSMode aCORSMode,
-                                         const SRIMetadata &aIntegrity,
-                                         nsScriptLoader* aLoader)
-  : nsScriptLoadRequest(nsScriptKind::Module,
-                        aElement,
-                        aVersion,
-                        aCORSMode,
-                        aIntegrity),
-    mIsTopLevel(true),
-    mLoader(aLoader)
-{}
-
-inline nsModuleLoadRequest*
-nsScriptLoadRequest::AsModuleRequest()
-{
-  MOZ_ASSERT(IsModuleRequest());
-  return static_cast<nsModuleLoadRequest*>(this);
-}
-
-void nsModuleLoadRequest::Cancel()
-{
-  nsScriptLoadRequest::Cancel();
-  mModuleScript = nullptr;
-  mProgress = nsScriptLoadRequest::Progress::Ready;
-  for (size_t i = 0; i < mImports.Length(); i++) {
-    mImports[i]->Cancel();
-  }
-  mReady.RejectIfExists(NS_ERROR_FAILURE, __func__);
-}
-
-void
-nsModuleLoadRequest::SetReady()
-{
-#ifdef DEBUG
-  for (size_t i = 0; i < mImports.Length(); i++) {
-    MOZ_ASSERT(mImports[i]->IsReadyToRun());
-  }
-#endif
-
-  nsScriptLoadRequest::SetReady();
-  mReady.ResolveIfExists(true, __func__);
-}
-
-void
-nsModuleLoadRequest::ModuleLoaded()
-{
-  // A module that was found to be marked as fetching in the module map has now
-  // been loaded.
-
-  mModuleScript = mLoader->GetFetchedModule(mURI);
-  mLoader->StartFetchingModuleDependencies(this);
-}
-
-void
-nsModuleLoadRequest::DependenciesLoaded()
-{
-  // The module and all of its dependencies have been successfully fetched and
-  // compiled.
-
-  if (!mLoader->InstantiateModuleTree(this)) {
-    LoadFailed();
-    return;
-  }
-
-  SetReady();
-  mLoader->ProcessLoadedModuleTree(this);
-  mLoader = nullptr;
-  mParent = nullptr;
-}
-
-void
-nsModuleLoadRequest::LoadFailed()
-{
-  Cancel();
-  mLoader->ProcessLoadedModuleTree(this);
-  mLoader = nullptr;
-  mParent = nullptr;
-}
-
-//////////////////////////////////////////////////////////////
-// nsModuleScript
-//////////////////////////////////////////////////////////////
-
-// A single module script.  May be used to satisfy multiple load requests.
-
-class nsModuleScript final : public nsISupports
-{
-  enum InstantiationState {
-    Uninstantiated,
-    Instantiated,
-    Errored
-  };
-
-  RefPtr<nsScriptLoader> mLoader;
-  nsCOMPtr<nsIURI> mBaseURL;
-  JS::Heap<JSObject*> mModuleRecord;
-  JS::Heap<JS::Value> mException;
-  InstantiationState mInstantiationState;
-
-  ~nsModuleScript();
-
-public:
-  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsModuleScript)
-
-  nsModuleScript(nsScriptLoader* aLoader,
-                 nsIURI* aBaseURL,
-                 JS::Handle<JSObject*> aModuleRecord);
-
-  nsScriptLoader* Loader() const { return mLoader; }
-  JSObject* ModuleRecord() const { return mModuleRecord; }
-  JS::Value Exception() const { return mException; }
-  nsIURI* BaseURL() const { return mBaseURL; }
-
-  void SetInstantiationResult(JS::Handle<JS::Value> aMaybeException);
-  bool IsUninstantiated() const {
-    return mInstantiationState == Uninstantiated;
-  }
-  bool IsInstantiated() const {
-    return mInstantiationState == Instantiated;
-  }
-  bool InstantiationFailed() const {
-    return mInstantiationState == Errored;
-  }
-
-  void UnlinkModuleRecord();
-};
-
-NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsModuleScript)
-NS_INTERFACE_MAP_END
-
-NS_IMPL_CYCLE_COLLECTION_CLASS(nsModuleScript)
-
-NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsModuleScript)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mLoader)
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mBaseURL)
-  tmp->UnlinkModuleRecord();
-NS_IMPL_CYCLE_COLLECTION_UNLINK_END
-
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsModuleScript)
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLoader)
-NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
-
-NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsModuleScript)
-  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mModuleRecord)
-  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mException)
-NS_IMPL_CYCLE_COLLECTION_TRACE_END
-
-NS_IMPL_CYCLE_COLLECTING_ADDREF(nsModuleScript)
-NS_IMPL_CYCLE_COLLECTING_RELEASE(nsModuleScript)
-
-nsModuleScript::nsModuleScript(nsScriptLoader *aLoader, nsIURI* aBaseURL,
-                               JS::Handle<JSObject*> aModuleRecord)
- : mLoader(aLoader),
-   mBaseURL(aBaseURL),
-   mModuleRecord(aModuleRecord),
-   mInstantiationState(Uninstantiated)
-{
-  MOZ_ASSERT(mLoader);
-  MOZ_ASSERT(mBaseURL);
-  MOZ_ASSERT(mModuleRecord);
-  MOZ_ASSERT(mException.isUndefined());
-
-  // Make module's host defined field point to this module script object.
-  // This is cleared in the UnlinkModuleRecord().
-  JS::SetModuleHostDefinedField(mModuleRecord, JS::PrivateValue(this));
-  HoldJSObjects(this);
-}
-
-void
-nsModuleScript::UnlinkModuleRecord()
-{
-  // Remove module's back reference to this object request if present.
-  if (mModuleRecord) {
-    MOZ_ASSERT(JS::GetModuleHostDefinedField(mModuleRecord).toPrivate() ==
-               this);
-    JS::SetModuleHostDefinedField(mModuleRecord, JS::UndefinedValue());
-  }
-  mModuleRecord = nullptr;
-  mException.setUndefined();
-}
-
-nsModuleScript::~nsModuleScript()
-{
-  if (mModuleRecord) {
-    // The object may be destroyed without being unlinked first.
-    UnlinkModuleRecord();
-  }
-  DropJSObjects(this);
-}
-
-void
-nsModuleScript::SetInstantiationResult(JS::Handle<JS::Value> aMaybeException)
-{
-  MOZ_ASSERT(mInstantiationState == Uninstantiated);
-  MOZ_ASSERT(mModuleRecord);
-  MOZ_ASSERT(mException.isUndefined());
-
-  if (aMaybeException.isUndefined()) {
-    mInstantiationState = Instantiated;
-  } else {
-    mModuleRecord = nullptr;
-    mException = aMaybeException;
-    mInstantiationState = Errored;
-  }
-}
-
-//////////////////////////////////////////////////////////////
-
-// nsScriptLoadRequestList
-//////////////////////////////////////////////////////////////
-
-nsScriptLoadRequestList::~nsScriptLoadRequestList()
-{
-  Clear();
-}
-
-void
-nsScriptLoadRequestList::Clear()
-{
-  while (!isEmpty()) {
-    RefPtr<nsScriptLoadRequest> first = StealFirst();
-    first->Cancel();
-    // And just let it go out of scope and die.
-  }
-}
-
-#ifdef DEBUG
-bool
-nsScriptLoadRequestList::Contains(nsScriptLoadRequest* aElem) const
-{
-  for (const nsScriptLoadRequest* req = getFirst();
-       req; req = req->getNext()) {
-    if (req == aElem) {
-      return true;
-    }
-  }
-
-  return false;
-}
-#endif // DEBUG
-
-inline void
-ImplCycleCollectionUnlink(nsScriptLoadRequestList& aField)
-{
-  while (!aField.isEmpty()) {
-    RefPtr<nsScriptLoadRequest> first = aField.StealFirst();
-  }
-}
-
-inline void
-ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
-                            nsScriptLoadRequestList& aField,
-                            const char* aName,
-                            uint32_t aFlags)
-{
-  for (nsScriptLoadRequest* request = aField.getFirst();
-       request; request = request->getNext())
-  {
-    CycleCollectionNoteChild(aCallback, request, aName, aFlags);
-  }
-}
-
-//////////////////////////////////////////////////////////////
-// nsScriptLoader::PreloadInfo
-//////////////////////////////////////////////////////////////
-
-inline void
-ImplCycleCollectionUnlink(nsScriptLoader::PreloadInfo& aField)
-{
-  ImplCycleCollectionUnlink(aField.mRequest);
-}
-
-inline void
-ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
-                            nsScriptLoader::PreloadInfo& aField,
-                            const char* aName,
-                            uint32_t aFlags = 0)
-{
-  ImplCycleCollectionTraverse(aCallback, aField.mRequest, aName, aFlags);
-}
-
-//////////////////////////////////////////////////////////////
-// nsScriptLoader
-//////////////////////////////////////////////////////////////
-
-NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsScriptLoader)
-NS_INTERFACE_MAP_END
-
-NS_IMPL_CYCLE_COLLECTION(nsScriptLoader,
-                         mNonAsyncExternalScriptInsertedRequests,
-                         mLoadingAsyncRequests,
-                         mLoadedAsyncRequests,
-                         mDeferRequests,
-                         mXSLTRequests,
-                         mParserBlockingRequest,
-                         mPreloads,
-                         mPendingChildLoaders,
-                         mFetchedModules)
-
-NS_IMPL_CYCLE_COLLECTING_ADDREF(nsScriptLoader)
-NS_IMPL_CYCLE_COLLECTING_RELEASE(nsScriptLoader)
-
-nsScriptLoader::nsScriptLoader(nsIDocument *aDocument)
-  : mDocument(aDocument),
-    mParserBlockingBlockerCount(0),
-    mBlockerCount(0),
-    mNumberOfProcessors(0),
-    mEnabled(true),
-    mDeferEnabled(false),
-    mDocumentParsingDone(false),
-    mBlockingDOMContentLoaded(false),
-    mReporter(new ConsoleReportCollector())
-{
-}
-
-nsScriptLoader::~nsScriptLoader()
-{
-  mObservers.Clear();
-
-  if (mParserBlockingRequest) {
-    mParserBlockingRequest->FireScriptAvailable(NS_ERROR_ABORT);
-  }
-
-  for (nsScriptLoadRequest* req = mXSLTRequests.getFirst(); req;
-       req = req->getNext()) {
-    req->FireScriptAvailable(NS_ERROR_ABORT);
-  }
-
-  for (nsScriptLoadRequest* req = mDeferRequests.getFirst(); req;
-       req = req->getNext()) {
-    req->FireScriptAvailable(NS_ERROR_ABORT);
-  }
-
-  for (nsScriptLoadRequest* req = mLoadingAsyncRequests.getFirst(); req;
-       req = req->getNext()) {
-    req->FireScriptAvailable(NS_ERROR_ABORT);
-  }
-
-  for (nsScriptLoadRequest* req = mLoadedAsyncRequests.getFirst(); req;
-       req = req->getNext()) {
-    req->FireScriptAvailable(NS_ERROR_ABORT);
-  }
-
-  for(nsScriptLoadRequest* req = mNonAsyncExternalScriptInsertedRequests.getFirst();
-      req;
-      req = req->getNext()) {
-    req->FireScriptAvailable(NS_ERROR_ABORT);
-  }
-
-  // Unblock the kids, in case any of them moved to a different document
-  // subtree in the meantime and therefore aren't actually going away.
-  for (uint32_t j = 0; j < mPendingChildLoaders.Length(); ++j) {
-    mPendingChildLoaders[j]->RemoveParserBlockingScriptExecutionBlocker();
-  }
-}
-
-// Helper method for checking if the script element is an event-handler
-// This means that it has both a for-attribute and a event-attribute.
-// Also, if the for-attribute has a value that matches "\s*window\s*",
-// and the event-attribute matches "\s*onload([ \(].*)?" then it isn't an
-// eventhandler. (both matches are case insensitive).
-// This is how IE seems to filter out a window's onload handler from a
-// <script for=... event=...> element.
-
-static bool
-IsScriptEventHandler(nsIContent* aScriptElement)
-{
-  if (!aScriptElement->IsHTMLElement()) {
-    return false;
-  }
-
-  nsAutoString forAttr, eventAttr;
-  if (!aScriptElement->GetAttr(kNameSpaceID_None, nsGkAtoms::_for, forAttr) ||
-      !aScriptElement->GetAttr(kNameSpaceID_None, nsGkAtoms::event, eventAttr)) {
-    return false;
-  }
-
-  const nsAString& for_str =
-    nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(forAttr);
-  if (!for_str.LowerCaseEqualsLiteral("window")) {
-    return true;
-  }
-
-  // We found for="window", now check for event="onload".
-  const nsAString& event_str =
-    nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(eventAttr, false);
-  if (!StringBeginsWith(event_str, NS_LITERAL_STRING("onload"),
-                        nsCaseInsensitiveStringComparator())) {
-    // It ain't "onload.*".
-
-    return true;
-  }
-
-  nsAutoString::const_iterator start, end;
-  event_str.BeginReading(start);
-  event_str.EndReading(end);
-
-  start.advance(6); // advance past "onload"
-
-  if (start != end && *start != '(' && *start != ' ') {
-    // We got onload followed by something other than space or
-    // '('. Not good enough.
-
-    return true;
-  }
-
-  return false;
-}
-
-nsresult
-nsScriptLoader::CheckContentPolicy(nsIDocument* aDocument,
-                                   nsISupports *aContext,
-                                   nsIURI *aURI,
-                                   const nsAString &aType,
-                                   bool aIsPreLoad)
-{
-  nsContentPolicyType contentPolicyType = aIsPreLoad
-                                          ? nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD
-                                          : nsIContentPolicy::TYPE_INTERNAL_SCRIPT;
-
-  int16_t shouldLoad = nsIContentPolicy::ACCEPT;
-  nsresult rv = NS_CheckContentLoadPolicy(contentPolicyType,
-                                          aURI,
-                                          aDocument->NodePrincipal(),
-                                          aContext,
-                                          NS_LossyConvertUTF16toASCII(aType),
-                                          nullptr,    //extra
-                                          &shouldLoad,
-                                          nsContentUtils::GetContentPolicy(),
-                                          nsContentUtils::GetSecurityManager());
-  if (NS_FAILED(rv) || NS_CP_REJECTED(shouldLoad)) {
-    if (NS_FAILED(rv) || shouldLoad != nsIContentPolicy::REJECT_TYPE) {
-      return NS_ERROR_CONTENT_BLOCKED;
-    }
-    return NS_ERROR_CONTENT_BLOCKED_SHOW_ALT;
-  }
-
-  return NS_OK;
-}
-
-bool
-nsScriptLoader::ModuleScriptsEnabled()
-{
-  static bool sEnabledForContent = false;
-  static bool sCachedPref = false;
-  if (!sCachedPref) {
-    sCachedPref = true;
-    Preferences::AddBoolVarCache(&sEnabledForContent, "dom.moduleScripts.enabled", false);
-  }
-
-  return nsContentUtils::IsChromeDoc(mDocument) || sEnabledForContent;
-}
-
-bool
-nsScriptLoader::ModuleMapContainsModule(nsModuleLoadRequest *aRequest) const
-{
-  // Returns whether we have fetched, or are currently fetching, a module script
-  // for the request's URL.
-  return mFetchingModules.Contains(aRequest->mURI) ||
-         mFetchedModules.Contains(aRequest->mURI);
-}
-
-bool
-nsScriptLoader::IsFetchingModule(nsModuleLoadRequest *aRequest) const
-{
-  bool fetching = mFetchingModules.Contains(aRequest->mURI);
-  MOZ_ASSERT_IF(fetching, !mFetchedModules.Contains(aRequest->mURI));
-  return fetching;
-}
-
-void
-nsScriptLoader::SetModuleFetchStarted(nsModuleLoadRequest *aRequest)
-{
-  // Update the module map to indicate that a module is currently being fetched.
-
-  MOZ_ASSERT(aRequest->IsLoading());
-  MOZ_ASSERT(!ModuleMapContainsModule(aRequest));
-  mFetchingModules.Put(aRequest->mURI, nullptr);
-}
-
-void
-nsScriptLoader::SetModuleFetchFinishedAndResumeWaitingRequests(nsModuleLoadRequest *aRequest,
-                                                               nsresult aResult)
-{
-  // Update module map with the result of fetching a single module script.  The
-  // module script pointer is nullptr on error.
-
-  MOZ_ASSERT(!aRequest->IsReadyToRun());
-
-  RefPtr<GenericPromise::Private> promise;
-  MOZ_ALWAYS_TRUE(mFetchingModules.Get(aRequest->mURI, getter_AddRefs(promise)));
-  mFetchingModules.Remove(aRequest->mURI);
-
-  RefPtr<nsModuleScript> ms(aRequest->mModuleScript);
-  MOZ_ASSERT(NS_SUCCEEDED(aResult) == (ms != nullptr));
-  mFetchedModules.Put(aRequest->mURI, ms);
-
-  if (promise) {
-    if (ms) {
-      promise->Resolve(true, __func__);
-    } else {
-      promise->Reject(aResult, __func__);
-    }
-  }
-}
-
-RefPtr<GenericPromise>
-nsScriptLoader::WaitForModuleFetch(nsModuleLoadRequest *aRequest)
-{
-  MOZ_ASSERT(ModuleMapContainsModule(aRequest));
-
-  RefPtr<GenericPromise::Private> promise;
-  if (mFetchingModules.Get(aRequest->mURI, getter_AddRefs(promise))) {
-    if (!promise) {
-      promise = new GenericPromise::Private(__func__);
-      mFetchingModules.Put(aRequest->mURI, promise);
-    }
-    return promise;
-  }
-
-  RefPtr<nsModuleScript> ms;
-  MOZ_ALWAYS_TRUE(mFetchedModules.Get(aRequest->mURI, getter_AddRefs(ms)));
-  if (!ms) {
-    return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
-  }
-
-  return GenericPromise::CreateAndResolve(true, __func__);
-}
-
-nsModuleScript*
-nsScriptLoader::GetFetchedModule(nsIURI* aURL) const
-{
-  bool found;
-  nsModuleScript* ms = mFetchedModules.GetWeak(aURL, &found);
-  MOZ_ASSERT(found);
-  return ms;
-}
-
-nsresult
-nsScriptLoader::ProcessFetchedModuleSource(nsModuleLoadRequest* aRequest)
-{
-  MOZ_ASSERT(!aRequest->mModuleScript);
-
-  nsresult rv = CreateModuleScript(aRequest);
-  SetModuleFetchFinishedAndResumeWaitingRequests(aRequest, rv);
-
-  free(aRequest->mScriptTextBuf);
-  aRequest->mScriptTextBuf = nullptr;
-  aRequest->mScriptTextLength = 0;
-
-  if (NS_SUCCEEDED(rv)) {
-    StartFetchingModuleDependencies(aRequest);
-  }
-
-  return rv;
-}
-
-nsresult
-nsScriptLoader::CreateModuleScript(nsModuleLoadRequest* aRequest)
-{
-  MOZ_ASSERT(!aRequest->mModuleScript);
-  MOZ_ASSERT(aRequest->mBaseURL);
-
-  nsCOMPtr<nsIScriptGlobalObject> globalObject = GetScriptGlobalObject();
-  if (!globalObject) {
-    return NS_ERROR_FAILURE;
-  }
-
-  nsCOMPtr<nsIScriptContext> context = globalObject->GetScriptContext();
-  if (!context) {
-    return NS_ERROR_FAILURE;
-  }
-
-  nsAutoMicroTask mt;
-  AutoEntryScript aes(globalObject, "CompileModule", true);
-
-  bool oldProcessingScriptTag = context->GetProcessingScriptTag();
-  context->SetProcessingScriptTag(true);
-
-  nsresult rv;
-  {
-    // Update our current script.
-    AutoCurrentScriptUpdater scriptUpdater(this, aRequest->mElement);
-    Maybe<AutoCurrentScriptUpdater> masterScriptUpdater;
-    nsCOMPtr<nsIDocument> master = mDocument->MasterDocument();
-    if (master != mDocument) {
-      masterScriptUpdater.emplace(master->ScriptLoader(),
-                                  aRequest->mElement);
-    }
-
-    JSContext* cx = aes.cx();
-    JS::Rooted<JSObject*> module(cx);
-
-    if (aRequest->mWasCompiledOMT) {
-      module = JS::FinishOffThreadModule(cx, aRequest->mOffThreadToken);
-      aRequest->mOffThreadToken = nullptr;
-      rv = module ? NS_OK : NS_ERROR_FAILURE;
-    } else {
-      JS::Rooted<JSObject*> global(cx, globalObject->GetGlobalJSObject());
-
-      JS::CompileOptions options(cx);
-      rv = FillCompileOptionsForRequest(aes, aRequest, global, &options);
-
-      if (NS_SUCCEEDED(rv)) {
-        nsAutoString inlineData;
-        SourceBufferHolder srcBuf = GetScriptSource(aRequest, inlineData);
-        rv = nsJSUtils::CompileModule(cx, srcBuf, global, options, &module);
-      }
-    }
-    MOZ_ASSERT(NS_SUCCEEDED(rv) == (module != nullptr));
-    if (module) {
-      aRequest->mModuleScript =
-        new nsModuleScript(this, aRequest->mBaseURL, module);
-    }
-  }
-
-  context->SetProcessingScriptTag(oldProcessingScriptTag);
-
-  return rv;
-}
-
-static bool
-ThrowTypeError(JSContext* aCx, nsModuleScript* aScript,
-               const nsString& aMessage)
-{
-  JS::Rooted<JSObject*> module(aCx, aScript->ModuleRecord());
-  JS::Rooted<JSScript*> script(aCx, JS::GetModuleScript(aCx, module));
-  JS::Rooted<JSString*> filename(aCx);
-  filename = JS_NewStringCopyZ(aCx, JS_GetScriptFilename(script));
-  if (!filename) {
-    return false;
-  }
-
-  JS::Rooted<JSString*> message(aCx, JS_NewUCStringCopyZ(aCx, aMessage.get()));
-  if (!message) {
-    return false;
-  }
-
-  JS::Rooted<JS::Value> error(aCx);
-  if (!JS::CreateError(aCx, JSEXN_TYPEERR, nullptr, filename, 0, 0, nullptr,
-                       message, &error)) {
-    return false;
-  }
-
-  JS_SetPendingException(aCx, error);
-  return false;
-}
-
-static bool
-HandleResolveFailure(JSContext* aCx, nsModuleScript* aScript,
-                     const nsAString& aSpecifier)
-{
-  // TODO: How can we get the line number of the failed import?
-
-  nsAutoString message(NS_LITERAL_STRING("Error resolving module specifier: "));
-  message.Append(aSpecifier);
-
-  return ThrowTypeError(aCx, aScript, message);
-}
-
-static bool
-HandleModuleNotFound(JSContext* aCx, nsModuleScript* aScript,
-                     const nsAString& aSpecifier)
-{
-  // TODO: How can we get the line number of the failed import?
-
-  nsAutoString message(NS_LITERAL_STRING("Resolved module not found in map: "));
-  message.Append(aSpecifier);
-
-  return ThrowTypeError(aCx, aScript, message);
-}
-
-static already_AddRefed<nsIURI>
-ResolveModuleSpecifier(nsModuleScript* aScript,
-                       const nsAString& aSpecifier)
-{
-  // The following module specifiers are allowed by the spec:
-  //  - a valid absolute URL
-  //  - a valid relative URL that starts with "/", "./" or "../"
-  //
-  // Bareword module specifiers are currently disallowed as these may be given
-  // special meanings in the future.
-
-  nsCOMPtr<nsIURI> uri;
-  nsresult rv = NS_NewURI(getter_AddRefs(uri), aSpecifier);
-  if (NS_SUCCEEDED(rv)) {
-    return uri.forget();
-  }
-
-  if (rv != NS_ERROR_MALFORMED_URI) {
-    return nullptr;
-  }
-
-  if (!StringBeginsWith(aSpecifier, NS_LITERAL_STRING("/")) &&
-      !StringBeginsWith(aSpecifier, NS_LITERAL_STRING("./")) &&
-      !StringBeginsWith(aSpecifier, NS_LITERAL_STRING("../"))) {
-    return nullptr;
-  }
-
-  rv = NS_NewURI(getter_AddRefs(uri), aSpecifier, nullptr, aScript->BaseURL());
-  if (NS_SUCCEEDED(rv)) {
-    return uri.forget();
-  }
-
-  return nullptr;
-}
-
-static nsresult
-RequestedModuleIsInAncestorList(nsModuleLoadRequest* aRequest, nsIURI* aURL, bool* aResult)
-{
-  const size_t ImportDepthLimit = 100;
-
-  *aResult = false;
-  size_t depth = 0;
-  while (aRequest) {
-    if (depth++ == ImportDepthLimit) {
-      return NS_ERROR_FAILURE;
-    }
-
-    bool equal;
-    nsresult rv = aURL->Equals(aRequest->mURI, &equal);
-    NS_ENSURE_SUCCESS(rv, rv);
-    if (equal) {
-      *aResult = true;
-      return NS_OK;
-    }
-
-    aRequest = aRequest->mParent;
-  }
-
-  return NS_OK;
-}
-
-static nsresult
-ResolveRequestedModules(nsModuleLoadRequest* aRequest, nsCOMArray<nsIURI> &aUrls)
-{
-  nsModuleScript* ms = aRequest->mModuleScript;
-
-  AutoJSAPI jsapi;
-  if (!jsapi.Init(ms->ModuleRecord())) {
-    return NS_ERROR_FAILURE;
-  }
-
-  JSContext* cx = jsapi.cx();
-  JS::Rooted<JSObject*> moduleRecord(cx, ms->ModuleRecord());
-  JS::Rooted<JSObject*> specifiers(cx, JS::GetRequestedModules(cx, moduleRecord));
-
-  uint32_t length;
-  if (!JS_GetArrayLength(cx, specifiers, &length)) {
-    return NS_ERROR_FAILURE;
-  }
-
-  JS::Rooted<JS::Value> val(cx);
-  for (uint32_t i = 0; i < length; i++) {
-    if (!JS_GetElement(cx, specifiers, i, &val)) {
-      return NS_ERROR_FAILURE;
-    }
-
-    nsAutoJSString specifier;
-    if (!specifier.init(cx, val)) {
-      return NS_ERROR_FAILURE;
-    }
-
-    // Let url be the result of resolving a module specifier given module script and requested.
-    nsModuleScript* ms = aRequest->mModuleScript;
-    nsCOMPtr<nsIURI> uri = ResolveModuleSpecifier(ms, specifier);
-    if (!uri) {
-      HandleResolveFailure(cx, ms, specifier);
-      return NS_ERROR_FAILURE;
-    }
-
-    bool isAncestor;
-    nsresult rv = RequestedModuleIsInAncestorList(aRequest, uri, &isAncestor);
-    NS_ENSURE_SUCCESS(rv, rv);
-    if (!isAncestor) {
-      aUrls.AppendElement(uri.forget());
-    }
-  }
-
-  return NS_OK;
-}
-
-void
-nsScriptLoader::StartFetchingModuleDependencies(nsModuleLoadRequest* aRequest)
-{
-  MOZ_ASSERT(aRequest->mModuleScript);
-  MOZ_ASSERT(!aRequest->IsReadyToRun());
-  aRequest->mProgress = nsModuleLoadRequest::Progress::FetchingImports;
-
-  nsCOMArray<nsIURI> urls;
-  nsresult rv = ResolveRequestedModules(aRequest, urls);
-  if (NS_FAILED(rv)) {
-    aRequest->LoadFailed();
-    return;
-  }
-
-  if (urls.Length() == 0) {
-    // There are no descendents to load so this request is ready.
-    aRequest->DependenciesLoaded();
-    return;
-  }
-
-  // For each url in urls, fetch a module script tree given url, module script's
-  // CORS setting, and module script's settings object.
-  nsTArray<RefPtr<GenericPromise>> importsReady;
-  for (size_t i = 0; i < urls.Length(); i++) {
-    RefPtr<GenericPromise> childReady =
-      StartFetchingModuleAndDependencies(aRequest, urls[i]);
-    importsReady.AppendElement(childReady);
-  }
-
-  // Wait for all imports to become ready.
-  RefPtr<GenericPromise::AllPromiseType> allReady =
-    GenericPromise::All(AbstractThread::GetCurrent(), importsReady);
-  allReady->Then(AbstractThread::GetCurrent(), __func__, aRequest,
-                 &nsModuleLoadRequest::DependenciesLoaded,
-                 &nsModuleLoadRequest::LoadFailed);
-}
-
-RefPtr<GenericPromise>
-nsScriptLoader::StartFetchingModuleAndDependencies(nsModuleLoadRequest* aRequest,
-                                                   nsIURI* aURI)
-{
-  MOZ_ASSERT(aURI);
-
-  RefPtr<nsModuleLoadRequest> childRequest =
-    new nsModuleLoadRequest(aRequest->mElement, aRequest->mJSVersion,
-                            aRequest->mCORSMode, aRequest->mIntegrity, this);
-
-  childRequest->mIsTopLevel = false;
-  childRequest->mURI = aURI;
-  childRequest->mIsInline = false;
-  childRequest->mReferrerPolicy = aRequest->mReferrerPolicy;
-  childRequest->mParent = aRequest;
-
-  RefPtr<GenericPromise> ready = childRequest->mReady.Ensure(__func__);
-
-  nsresult rv = StartLoad(childRequest, NS_LITERAL_STRING("module"), false);
-  if (NS_FAILED(rv)) {
-    childRequest->mReady.Reject(rv, __func__);
-    return ready;
-  }
-
-  aRequest->mImports.AppendElement(childRequest);
-  return ready;
-}
-
-bool
-HostResolveImportedModule(JSContext* aCx, unsigned argc, JS::Value* vp)
-{
-  MOZ_ASSERT(argc == 2);
-  JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
-  JS::Rooted<JSObject*> module(aCx, &args[0].toObject());
-  JS::Rooted<JSString*> specifier(aCx, args[1].toString());
-
-  // Let referencing module script be referencingModule.[[HostDefined]].
-  JS::Value value = JS::GetModuleHostDefinedField(module);
-  auto script = static_cast<nsModuleScript*>(value.toPrivate());
-  MOZ_ASSERT(script->ModuleRecord() == module);
-
-  // Let url be the result of resolving a module specifier given referencing
-  // module script and specifier. If the result is failure, throw a TypeError
-  // exception and abort these steps.
-  nsAutoJSString string;
-  if (!string.init(aCx, specifier)) {
-    return false;
-  }
-
-  nsCOMPtr<nsIURI> uri = ResolveModuleSpecifier(script, string);
-  if (!uri) {
-    return HandleResolveFailure(aCx, script, string);
-  }
-
-  // Let resolved module script be the value of the entry in module map whose
-  // key is url. If no such entry exists, throw a TypeError exception and abort
-  // these steps.
-  nsModuleScript* ms = script->Loader()->GetFetchedModule(uri);
-  if (!ms) {
-    return HandleModuleNotFound(aCx, script, string);
-  }
-
-  if (ms->InstantiationFailed()) {
-    JS::Rooted<JS::Value> exception(aCx, ms->Exception());
-    JS_SetPendingException(aCx, exception);
-    return false;
-  }
-
-  *vp = JS::ObjectValue(*ms->ModuleRecord());
-  return true;
-}
-
-static nsresult
-EnsureModuleResolveHook(JSContext* aCx)
-{
-  if (JS::GetModuleResolveHook(aCx)) {
-    return NS_OK;
-  }
-
-  JS::Rooted<JSFunction*> func(aCx);
-  func = JS_NewFunction(aCx, HostResolveImportedModule, 2, 0,
-                        "HostResolveImportedModule");
-  if (!func) {
-    return NS_ERROR_FAILURE;
-  }
-
-  JS::SetModuleResolveHook(aCx, func);
-  return NS_OK;
-}
-
-void
-nsScriptLoader::ProcessLoadedModuleTree(nsModuleLoadRequest* aRequest)
-{
-  if (aRequest->IsTopLevel()) {
-    MaybeMoveToLoadedList(aRequest);
-    ProcessPendingRequests();
-  }
-
-  if (aRequest->mWasCompiledOMT) {
-    mDocument->UnblockOnload(false);
-  }
-}
-
-bool
-nsScriptLoader::InstantiateModuleTree(nsModuleLoadRequest* aRequest)
-{
-  // Perform eager instantiation of the loaded module tree.
-
-  MOZ_ASSERT(aRequest);
-
-  nsModuleScript* ms = aRequest->mModuleScript;
-  MOZ_ASSERT(ms);
-  if (!ms || !ms->ModuleRecord()) {
-    return false;
-  }
-
-  AutoJSAPI jsapi;
-  if (NS_WARN_IF(!jsapi.Init(ms->ModuleRecord()))) {
-    return false;
-  }
-
-  nsresult rv = EnsureModuleResolveHook(jsapi.cx());
-  NS_ENSURE_SUCCESS(rv, false);
-
-  JS::Rooted<JSObject*> module(jsapi.cx(), ms->ModuleRecord());
-  bool ok = NS_SUCCEEDED(nsJSUtils::ModuleDeclarationInstantiation(jsapi.cx(), module));
-
-  JS::RootedValue exception(jsapi.cx());
-  if (!ok) {
-    MOZ_ASSERT(jsapi.HasException());
-    if (!jsapi.StealException(&exception)) {
-      return false;
-    }
-    MOZ_ASSERT(!exception.isUndefined());
-  }
-
-  // Mark this module and any uninstantiated dependencies found via depth-first
-  // search as instantiated and record any error.
-
-  mozilla::Vector<nsModuleLoadRequest*, 1> requests;
-  if (!requests.append(aRequest)) {
-    return false;
-  }
-
-  while (!requests.empty()) {
-    nsModuleLoadRequest* request = requests.popCopy();
-    nsModuleScript* ms = request->mModuleScript;
-    if (!ms->IsUninstantiated()) {
-      continue;
-    }
-
-    ms->SetInstantiationResult(exception);
-
-    for (auto import : request->mImports) {
-      if (import->mModuleScript->IsUninstantiated() &&
-          !requests.append(import))
-      {
-        return false;
-      }
-    }
-  }
-
-  return true;
-}
-
-nsresult
-nsScriptLoader::StartLoad(nsScriptLoadRequest *aRequest, const nsAString &aType,
-                          bool aScriptFromHead)
-{
-  MOZ_ASSERT(aRequest->IsLoading());
-  NS_ENSURE_TRUE(mDocument, NS_ERROR_NULL_POINTER);
-
-  // If this document is sandboxed without 'allow-scripts', abort.
-  if (mDocument->HasScriptsBlockedBySandbox()) {
-    return NS_OK;
-  }
-
-  if (aRequest->IsModuleRequest()) {
-    // Check whether the module has been fetched or is currently being fetched,
-    // and if so wait for it.
-    nsModuleLoadRequest* request = aRequest->AsModuleRequest();
-    if (ModuleMapContainsModule(request)) {
-      WaitForModuleFetch(request)
-        ->Then(AbstractThread::GetCurrent(), __func__, request,
-               &nsModuleLoadRequest::ModuleLoaded,
-               &nsModuleLoadRequest::LoadFailed);
-      return NS_OK;
-    }
-
-    // Otherwise put the URL in the module map and mark it as fetching.
-    SetModuleFetchStarted(request);
-  }
-
-  nsContentPolicyType contentPolicyType = aRequest->IsPreload()
-                                          ? nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD
-                                          : nsIContentPolicy::TYPE_INTERNAL_SCRIPT;
-  nsCOMPtr<nsINode> context;
-  if (aRequest->mElement) {
-    context = do_QueryInterface(aRequest->mElement);
-  }
-  else {
-    context = mDocument;
-  }
-
-  nsCOMPtr<nsILoadGroup> loadGroup = mDocument->GetDocumentLoadGroup();
-  nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->MasterDocument()->GetWindow();
-  NS_ENSURE_TRUE(window, NS_ERROR_NULL_POINTER);
-  nsIDocShell *docshell = window->GetDocShell();
-  nsCOMPtr<nsIInterfaceRequestor> prompter(do_QueryInterface(docshell));
-
-  nsSecurityFlags securityFlags;
-  if (aRequest->IsModuleRequest()) {
-    // According to the spec, module scripts have different behaviour to classic
-    // scripts and always use CORS.
-    securityFlags = nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS;
-    if (aRequest->mCORSMode == CORS_NONE) {
-      securityFlags |= nsILoadInfo::SEC_COOKIES_OMIT;
-    } else if (aRequest->mCORSMode == CORS_ANONYMOUS) {
-      securityFlags |= nsILoadInfo::SEC_COOKIES_SAME_ORIGIN;
-    } else {
-      MOZ_ASSERT(aRequest->mCORSMode == CORS_USE_CREDENTIALS);
-      securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
-    }
-  } else {
-    securityFlags = aRequest->mCORSMode == CORS_NONE
-      ? nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL
-      : nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS;
-    if (aRequest->mCORSMode == CORS_ANONYMOUS) {
-      securityFlags |= nsILoadInfo::SEC_COOKIES_SAME_ORIGIN;
-    } else if (aRequest->mCORSMode == CORS_USE_CREDENTIALS) {
-      securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE;
-    }
-  }
-  securityFlags |= nsILoadInfo::SEC_ALLOW_CHROME;
-
-  nsCOMPtr<nsIChannel> channel;
-  nsresult rv = NS_NewChannel(getter_AddRefs(channel),
-                              aRequest->mURI,
-                              context,
-                              securityFlags,
-                              contentPolicyType,
-                              loadGroup,
-                              prompter,
-                              nsIRequest::LOAD_NORMAL |
-                              nsIChannel::LOAD_CLASSIFY_URI);
-
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  nsIScriptElement *script = aRequest->mElement;
-  nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(channel));
-
-  if (cos) {
-    if (aScriptFromHead &&
-        !(script && (script->GetScriptAsync() || script->GetScriptDeferred()))) {
-      // synchronous head scripts block lading of most other non js/css
-      // content such as images
-      cos->AddClassFlags(nsIClassOfService::Leader);
-    } else if (!(script && script->GetScriptDeferred())) {
-      // other scripts are neither blocked nor prioritized unless marked deferred
-      cos->AddClassFlags(nsIClassOfService::Unblocked);
-    }
-  }
-
-  nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
-  if (httpChannel) {
-    // HTTP content negotation has little value in this context.
-    httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"),
-                                  NS_LITERAL_CSTRING("*/*"),
-                                  false);
-    httpChannel->SetReferrerWithPolicy(mDocument->GetDocumentURI(),
-                                       aRequest->mReferrerPolicy);
-
-    nsCOMPtr<nsIHttpChannelInternal> internalChannel(do_QueryInterface(httpChannel));
-    if (internalChannel) {
-      internalChannel->SetIntegrityMetadata(aRequest->mIntegrity.GetIntegrityString());
-    }
-  }
-
-  nsCOMPtr<nsILoadContext> loadContext(do_QueryInterface(docshell));
-  mozilla::net::PredictorLearn(aRequest->mURI, mDocument->GetDocumentURI(),
-      nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE, loadContext);
-
-  // Set the initiator type
-  nsCOMPtr<nsITimedChannel> timedChannel(do_QueryInterface(httpChannel));
-  if (timedChannel) {
-    timedChannel->SetInitiatorType(NS_LITERAL_STRING("script"));
-  }
-
-  nsAutoPtr<mozilla::dom::SRICheckDataVerifier> sriDataVerifier;
-  if (!aRequest->mIntegrity.IsEmpty()) {
-    nsAutoCString sourceUri;
-    if (mDocument->GetDocumentURI()) {
-      mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
-    }
-    sriDataVerifier = new SRICheckDataVerifier(aRequest->mIntegrity, sourceUri,
-                                               mReporter);
-  }
-
-  RefPtr<nsScriptLoadHandler> handler =
-      new nsScriptLoadHandler(this, aRequest, sriDataVerifier.forget());
-
-  nsCOMPtr<nsIIncrementalStreamLoader> loader;
-  rv = NS_NewIncrementalStreamLoader(getter_AddRefs(loader), handler);
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  return channel->AsyncOpen2(loader);
-}
-
-bool
-nsScriptLoader::PreloadURIComparator::Equals(const PreloadInfo &aPi,
-                                             nsIURI * const &aURI) const
-{
-  bool same;
-  return NS_SUCCEEDED(aPi.mRequest->mURI->Equals(aURI, &same)) &&
-         same;
-}
-
-class nsScriptRequestProcessor : public Runnable
-{
-private:
-  RefPtr<nsScriptLoader> mLoader;
-  RefPtr<nsScriptLoadRequest> mRequest;
-public:
-  nsScriptRequestProcessor(nsScriptLoader* aLoader,
-                           nsScriptLoadRequest* aRequest)
-    : mLoader(aLoader)
-    , mRequest(aRequest)
-  {}
-  NS_IMETHOD Run() override
-  {
-    return mLoader->ProcessRequest(mRequest);
-  }
-};
-
-static inline bool
-ParseTypeAttribute(const nsAString& aType, JSVersion* aVersion)
-{
-  MOZ_ASSERT(!aType.IsEmpty());
-  MOZ_ASSERT(aVersion);
-  MOZ_ASSERT(*aVersion == JSVERSION_DEFAULT);
-
-  nsContentTypeParser parser(aType);
-
-  nsAutoString mimeType;
-  nsresult rv = parser.GetType(mimeType);
-  NS_ENSURE_SUCCESS(rv, false);
-
-  if (!nsContentUtils::IsJavascriptMIMEType(mimeType)) {
-    return false;
-  }
-
-  // Get the version string, and ensure the language supports it.
-  nsAutoString versionName;
-  rv = parser.GetParameter("version", versionName);
-
-  if (NS_SUCCEEDED(rv)) {
-    *aVersion = nsContentUtils::ParseJavascriptVersion(versionName);
-  } else if (rv != NS_ERROR_INVALID_ARG) {
-    return false;
-  }
-
-  return true;
-}
-
-static bool
-CSPAllowsInlineScript(nsIScriptElement *aElement, nsIDocument *aDocument)
-{
-  nsCOMPtr<nsIContentSecurityPolicy> csp;
-  // Note: For imports NodePrincipal and the principal of the master are
-  // the same.
-  nsresult rv = aDocument->NodePrincipal()->GetCsp(getter_AddRefs(csp));
-  NS_ENSURE_SUCCESS(rv, false);
-
-  if (!csp) {
-    // no CSP --> allow
-    return true;
-  }
-
-  // query the nonce
-  nsCOMPtr<nsIContent> scriptContent = do_QueryInterface(aElement);
-  nsAutoString nonce;
-  scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::nonce, nonce);
-  bool parserCreated = aElement->GetParserCreated() != mozilla::dom::NOT_FROM_PARSER;
-
-  // query the scripttext
-  nsAutoString scriptText;
-  aElement->GetScriptText(scriptText);
-
-  bool allowInlineScript = false;
-  rv = csp->GetAllowsInline(nsIContentPolicy::TYPE_SCRIPT,
-                            nonce, parserCreated, scriptText,
-                            aElement->GetScriptLineNumber(),
-                            &allowInlineScript);
-  return allowInlineScript;
-}
-
-nsScriptLoadRequest*
-nsScriptLoader::CreateLoadRequest(nsScriptKind aKind,
-                                  nsIScriptElement* aElement,
-                                  uint32_t aVersion, CORSMode aCORSMode,
-                                  const SRIMetadata &aIntegrity)
-{
-  if (aKind == nsScriptKind::Classic) {
-    return new nsScriptLoadRequest(aKind, aElement, aVersion, aCORSMode,
-                                   aIntegrity);
-  }
-
-  MOZ_ASSERT(aKind == nsScriptKind::Module);
-  return new nsModuleLoadRequest(aElement, aVersion, aCORSMode, aIntegrity,
-                                 this);
-}
-
-bool
-nsScriptLoader::ProcessScriptElement(nsIScriptElement *aElement)
-{
-  // We need a document to evaluate scripts.
-  NS_ENSURE_TRUE(mDocument, false);
-
-  // Check to see if scripts has been turned off.
-  if (!mEnabled || !mDocument->IsScriptEnabled()) {
-    return false;
-  }
-
-  NS_ASSERTION(!aElement->IsMalformed(), "Executing malformed script");
-
-  nsCOMPtr<nsIContent> scriptContent = do_QueryInterface(aElement);
-
-  // Step 13. Check that the script is not an eventhandler
-  if (IsScriptEventHandler(scriptContent)) {
-    return false;
-  }
-
-  JSVersion version = JSVERSION_DEFAULT;
-
-  // Check the type attribute to determine language and version.
-  // If type exists, it trumps the deprecated 'language='
-  nsAutoString type;
-  bool hasType = aElement->GetScriptType(type);
-
-  nsScriptKind scriptKind = nsScriptKind::Classic;
-  if (!type.IsEmpty()) {
-    if (ModuleScriptsEnabled() && type.LowerCaseEqualsASCII("module")) {
-      scriptKind = nsScriptKind::Module;
-    } else {
-      NS_ENSURE_TRUE(ParseTypeAttribute(type, &version), false);
-    }
-  } else if (!hasType) {
-    // no 'type=' element
-    // "language" is a deprecated attribute of HTML, so we check it only for
-    // HTML script elements.
-    if (scriptContent->IsHTMLElement()) {
-      nsAutoString language;
-      scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::language, language);
-      if (!language.IsEmpty()) {
-        if (!nsContentUtils::IsJavaScriptLanguage(language)) {
-          return false;
-        }
-      }
-    }
-  }
-
-  // "In modern user agents that support module scripts, the script element with
-  // the nomodule attribute will be ignored".
-  // "The nomodule attribute must not be specified on module scripts (and will
-  // be ignored if it is)."
-  if (ModuleScriptsEnabled() &&
-      scriptKind == nsScriptKind::Classic &&
-      scriptContent->IsHTMLElement() &&
-      scriptContent->HasAttr(kNameSpaceID_None, nsGkAtoms::nomodule)) {
-    return false;
-  }
-
-  // Step 15. and later in the HTML5 spec
-  nsresult rv = NS_OK;
-  RefPtr<nsScriptLoadRequest> request;
-  if (aElement->GetScriptExternal()) {
-    // external script
-    nsCOMPtr<nsIURI> scriptURI = aElement->GetScriptURI();
-    if (!scriptURI) {
-      // Asynchronously report the failure to create a URI object
-      NS_DispatchToCurrentThread(
-        NewRunnableMethod(aElement,
-                          &nsIScriptElement::FireErrorEvent));
-      return false;
-    }
-
-    // Double-check that the preload matches what we're asked to load now.
-    mozilla::net::ReferrerPolicy ourRefPolicy = mDocument->GetReferrerPolicy();
-    CORSMode ourCORSMode = aElement->GetCORSMode();
-    nsTArray<PreloadInfo>::index_type i =
-      mPreloads.IndexOf(scriptURI.get(), 0, PreloadURIComparator());
-    if (i != nsTArray<PreloadInfo>::NoIndex) {
-      // preloaded
-      // note that a script-inserted script can steal a preload!
-      request = mPreloads[i].mRequest;
-      request->mElement = aElement;
-      nsString preloadCharset(mPreloads[i].mCharset);
-      mPreloads.RemoveElementAt(i);
-
-      // Double-check that the charset the preload used is the same as
-      // the charset we have now.
-      nsAutoString elementCharset;
-      aElement->GetScriptCharset(elementCharset);
-      if (elementCharset.Equals(preloadCharset) &&
-          ourCORSMode == request->mCORSMode &&
-          ourRefPolicy == request->mReferrerPolicy &&
-          scriptKind == request->mKind) {
-        rv = CheckContentPolicy(mDocument, aElement, request->mURI, type, false);
-        if (NS_FAILED(rv)) {
-          // probably plans have changed; even though the preload was allowed seems
-          // like the actual load is not; let's cancel the preload request.
-          request->Cancel();
-          return false;
-        }
-      } else {
-        // Drop the preload
-        request = nullptr;
-      }
-    }
-
-    if (!request) {
-      // no usable preload
-
-      SRIMetadata sriMetadata;
-      {
-        nsAutoString integrity;
-        scriptContent->GetAttr(kNameSpaceID_None, nsGkAtoms::integrity,
-                               integrity);
-        if (!integrity.IsEmpty()) {
-          MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug,
-                 ("nsScriptLoader::ProcessScriptElement, integrity=%s",
-                  NS_ConvertUTF16toUTF8(integrity).get()));
-          nsAutoCString sourceUri;
-          if (mDocument->GetDocumentURI()) {
-            mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
-          }
-          SRICheck::IntegrityMetadata(integrity, sourceUri, mReporter,
-                                      &sriMetadata);
-        }
-      }
-
-      request = CreateLoadRequest(scriptKind, aElement, version, ourCORSMode,
-                                  sriMetadata);
-      request->mURI = scriptURI;
-      request->mIsInline = false;
-      request->mReferrerPolicy = ourRefPolicy;
-
-      // set aScriptFromHead to false so we don't treat non preloaded scripts as
-      // blockers for full page load. See bug 792438.
-      rv = StartLoad(request, type, false);
-      if (NS_FAILED(rv)) {
-        // Asynchronously report the load failure
-        NS_DispatchToCurrentThread(
-          NewRunnableMethod(aElement,
-                            &nsIScriptElement::FireErrorEvent));
-        return false;
-      }
-    }
-
-    // Should still be in loading stage of script.
-    NS_ASSERTION(!request->InCompilingStage(),
-                 "Request should not yet be in compiling stage.");
-
-    request->mJSVersion = version;
-
-    if (aElement->GetScriptAsync()) {
-      request->mIsAsync = true;
-      if (request->IsReadyToRun()) {
-        mLoadedAsyncRequests.AppendElement(request);
-        // The script is available already. Run it ASAP when the event
-        // loop gets a chance to spin.
-
-        // KVKV TODO: Instead of processing immediately, try off-thread-parsing
-        // it and only schedule a pending ProcessRequest if that fails.
-        ProcessPendingRequestsAsync();
-      } else {
-        mLoadingAsyncRequests.AppendElement(request);
-      }
-      return false;
-    }
-    if (!aElement->GetParserCreated()) {
-      // Violate the HTML5 spec in order to make LABjs and the "order" plug-in
-      // for RequireJS work with their Gecko-sniffed code path. See
-      // http://lists.w3.org/Archives/Public/public-html/2010Oct/0088.html
-      request->mIsNonAsyncScriptInserted = true;
-      mNonAsyncExternalScriptInsertedRequests.AppendElement(request);
-      if (request->IsReadyToRun()) {
-        // The script is available already. Run it ASAP when the event
-        // loop gets a chance to spin.
-        ProcessPendingRequestsAsync();
-      }
-      return false;
-    }
-    // we now have a parser-inserted request that may or may not be still
-    // loading
-    if (aElement->GetScriptDeferred() || request->IsModuleRequest()) {
-      // We don't want to run this yet.
-      // If we come here, the script is a parser-created script and it has
-      // the defer attribute but not the async attribute. Since a
-      // a parser-inserted script is being run, we came here by the parser
-      // running the script, which means the parser is still alive and the
-      // parse is ongoing.
-      NS_ASSERTION(mDocument->GetCurrentContentSink() ||
-                   aElement->GetParserCreated() == FROM_PARSER_XSLT,
-          "Non-XSLT Defer script on a document without an active parser; bug 592366.");
-      AddDeferRequest(request);
-      return false;
-    }
-
-    if (aElement->GetParserCreated() == FROM_PARSER_XSLT) {
-      // Need to maintain order for XSLT-inserted scripts
-      NS_ASSERTION(!mParserBlockingRequest,
-          "Parser-blocking scripts and XSLT scripts in the same doc!");
-      request->mIsXSLT = true;
-      mXSLTRequests.AppendElement(request);
-      if (request->IsReadyToRun()) {
-        // The script is available already. Run it ASAP when the event
-        // loop gets a chance to spin.
-        ProcessPendingRequestsAsync();
-      }
-      return true;
-    }
-
-    if (request->IsReadyToRun() && ReadyToExecuteParserBlockingScripts()) {
-      // The request has already been loaded and there are no pending style
-      // sheets. If the script comes from the network stream, cheat for
-      // performance reasons and avoid a trip through the event loop.
-      if (aElement->GetParserCreated() == FROM_PARSER_NETWORK) {
-        return ProcessRequest(request) == NS_ERROR_HTMLPARSER_BLOCK;
-      }
-      // Otherwise, we've got a document.written script, make a trip through
-      // the event loop to hide the preload effects from the scripts on the
-      // Web page.
-      NS_ASSERTION(!mParserBlockingRequest,
-          "There can be only one parser-blocking script at a time");
-      NS_ASSERTION(mXSLTRequests.isEmpty(),
-          "Parser-blocking scripts and XSLT scripts in the same doc!");
-      mParserBlockingRequest = request;
-      ProcessPendingRequestsAsync();
-      return true;
-    }
-
-    // The script hasn't loaded yet or there's a style sheet blocking it.
-    // The script will be run when it loads or the style sheet loads.
-    NS_ASSERTION(!mParserBlockingRequest,
-        "There can be only one parser-blocking script at a time");
-    NS_ASSERTION(mXSLTRequests.isEmpty(),
-        "Parser-blocking scripts and XSLT scripts in the same doc!");
-    mParserBlockingRequest = request;
-    return true;
-  }
-
-  // inline script
-  // Is this document sandboxed without 'allow-scripts'?
-  if (mDocument->HasScriptsBlockedBySandbox()) {
-    return false;
-  }
-
-  // Does CSP allow this inline script to run?
-  if (!CSPAllowsInlineScript(aElement, mDocument)) {
-    return false;
-  }
-
-  // Inline scripts ignore ther CORS mode and are always CORS_NONE
-  request = CreateLoadRequest(scriptKind, aElement, version, CORS_NONE,
-                              SRIMetadata()); // SRI doesn't apply
-  request->mJSVersion = version;
-  request->mIsInline = true;
-  request->mURI = mDocument->GetDocumentURI();
-  request->mLineNo = aElement->GetScriptLineNumber();
-
-  if (request->IsModuleRequest()) {
-    nsModuleLoadRequest* modReq = request->AsModuleRequest();
-    modReq->mBaseURL = mDocument->GetDocBaseURI();
-    rv = CreateModuleScript(modReq);
-    NS_ENSURE_SUCCESS(rv, false);
-    StartFetchingModuleDependencies(modReq);
-    if (aElement->GetScriptAsync()) {
-      mLoadingAsyncRequests.AppendElement(request);
-    } else {
-      AddDeferRequest(request);
-    }
-    return false;
-  }
-  request->mProgress = nsScriptLoadRequest::Progress::Ready;
-  if (aElement->GetParserCreated() == FROM_PARSER_XSLT &&
-      (!ReadyToExecuteParserBlockingScripts() || !mXSLTRequests.isEmpty())) {
-    // Need to maintain order for XSLT-inserted scripts
-    NS_ASSERTION(!mParserBlockingRequest,
-        "Parser-blocking scripts and XSLT scripts in the same doc!");
-    mXSLTRequests.AppendElement(request);
-    return true;
-  }
-  if (aElement->GetParserCreated() == NOT_FROM_PARSER) {
-    NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
-        "A script-inserted script is inserted without an update batch?");
-    nsContentUtils::AddScriptRunner(new nsScriptRequestProcessor(this,
-                                                                 request));
-    return false;
-  }
-  if (aElement->GetParserCreated() == FROM_PARSER_NETWORK &&
-      !ReadyToExecuteParserBlockingScripts()) {
-    NS_ASSERTION(!mParserBlockingRequest,
-        "There can be only one parser-blocking script at a time");
-    mParserBlockingRequest = request;
-    NS_ASSERTION(mXSLTRequests.isEmpty(),
-        "Parser-blocking scripts and XSLT scripts in the same doc!");
-    return true;
-  }
-  // We now have a document.written inline script or we have an inline script
-  // from the network but there is no style sheet that is blocking scripts.
-  // Don't check for style sheets blocking scripts in the document.write
-  // case to avoid style sheet network activity affecting when
-  // document.write returns. It's not really necessary to do this if
-  // there's no document.write currently on the call stack. However,
-  // this way matches IE more closely than checking if document.write
-  // is on the call stack.
-  NS_ASSERTION(nsContentUtils::IsSafeToRunScript(),
-      "Not safe to run a parser-inserted script?");
-  return ProcessRequest(request) == NS_ERROR_HTMLPARSER_BLOCK;
-}
-
-namespace {
-
-class NotifyOffThreadScriptLoadCompletedRunnable : public Runnable
-{
-  RefPtr<nsScriptLoadRequest> mRequest;
-  RefPtr<nsScriptLoader> mLoader;
-  void *mToken;
-
-public:
-  NotifyOffThreadScriptLoadCompletedRunnable(nsScriptLoadRequest* aRequest,
-                                             nsScriptLoader* aLoader)
-    : mRequest(aRequest), mLoader(aLoader), mToken(nullptr)
-  {}
-
-  virtual ~NotifyOffThreadScriptLoadCompletedRunnable();
-
-  void SetToken(void* aToken) {
-    MOZ_ASSERT(aToken && !mToken);
-    mToken = aToken;
-  }
-
-  NS_DECL_NSIRUNNABLE
-};
-
-} /* anonymous namespace */
-
-nsresult
-nsScriptLoader::ProcessOffThreadRequest(nsScriptLoadRequest* aRequest)
-{
-  MOZ_ASSERT(aRequest->mProgress == nsScriptLoadRequest::Progress::Compiling);
-  MOZ_ASSERT(!aRequest->mWasCompiledOMT);
-
-  aRequest->mWasCompiledOMT = true;
-
-  if (aRequest->IsModuleRequest()) {
-    MOZ_ASSERT(aRequest->mOffThreadToken);
-    nsModuleLoadRequest* request = aRequest->AsModuleRequest();
-    nsresult rv = ProcessFetchedModuleSource(request);
-    if (NS_FAILED(rv)) {
-      request->LoadFailed();
-    }
-    return rv;
-  }
-
-  aRequest->SetReady();
-
-  if (aRequest == mParserBlockingRequest) {
-    if (!ReadyToExecuteParserBlockingScripts()) {
-      // If not ready to execute scripts, schedule an async call to
-      // ProcessPendingRequests to handle it.
-      ProcessPendingRequestsAsync();
-      return NS_OK;
-    }
-
-    // Same logic as in top of ProcessPendingRequests.
-    mParserBlockingRequest = nullptr;
-    UnblockParser(aRequest);
-    ProcessRequest(aRequest);
-    mDocument->UnblockOnload(false);
-    ContinueParserAsync(aRequest);
-    return NS_OK;
-  }
-
-  nsresult rv = ProcessRequest(aRequest);
-  mDocument->UnblockOnload(false);
-  return rv;
-}
-
-NotifyOffThreadScriptLoadCompletedRunnable::~NotifyOffThreadScriptLoadCompletedRunnable()
-{
-  if (MOZ_UNLIKELY(mRequest || mLoader) && !NS_IsMainThread()) {
-    NS_ReleaseOnMainThread(mRequest.forget());
-    NS_ReleaseOnMainThread(mLoader.forget());
-  }
-}
-
-NS_IMETHODIMP
-NotifyOffThreadScriptLoadCompletedRunnable::Run()
-{
-  MOZ_ASSERT(NS_IsMainThread());
-
-  // We want these to be dropped on the main thread, once we return from this
-  // function.
-  RefPtr<nsScriptLoadRequest> request = mRequest.forget();
-  RefPtr<nsScriptLoader> loader = mLoader.forget();
-
-  request->mOffThreadToken = mToken;
-  nsresult rv = loader->ProcessOffThreadRequest(request);
-
-  return rv;
-}
-
-static void
-OffThreadScriptLoaderCallback(void *aToken, void *aCallbackData)
-{
-  RefPtr<NotifyOffThreadScriptLoadCompletedRunnable> aRunnable =
-    dont_AddRef(static_cast<NotifyOffThreadScriptLoadCompletedRunnable*>(aCallbackData));
-  aRunnable->SetToken(aToken);
-  NS_DispatchToMainThread(aRunnable);
-}
-
-nsresult
-nsScriptLoader::AttemptAsyncScriptCompile(nsScriptLoadRequest* aRequest)
-{
-  MOZ_ASSERT_IF(!aRequest->IsModuleRequest(), aRequest->IsReadyToRun());
-  MOZ_ASSERT(!aRequest->mWasCompiledOMT);
-
-  // Don't off-thread compile inline scripts.
-  if (aRequest->mIsInline) {
-    return NS_ERROR_FAILURE;
-  }
-
-  nsCOMPtr<nsIScriptGlobalObject> globalObject = GetScriptGlobalObject();
-  if (!globalObject) {
-    return NS_ERROR_FAILURE;
-  }
-
-  AutoJSAPI jsapi;
-  if (!jsapi.Init(globalObject)) {
-    return NS_ERROR_FAILURE;
-  }
-
-  JSContext* cx = jsapi.cx();
-  JS::Rooted<JSObject*> global(cx, globalObject->GetGlobalJSObject());
-  JS::CompileOptions options(cx);
-
-  nsresult rv = FillCompileOptionsForRequest(jsapi, aRequest, global, &options);
-  if (NS_WARN_IF(NS_FAILED(rv))) {
-    return rv;
-  }
-
-  if (!JS::CanCompileOffThread(cx, options, aRequest->mScriptTextLength)) {
-    return NS_ERROR_FAILURE;
-  }
-
-  RefPtr<NotifyOffThreadScriptLoadCompletedRunnable> runnable =
-    new NotifyOffThreadScriptLoadCompletedRunnable(aRequest, this);
-
-  if (aRequest->IsModuleRequest()) {
-    if (!JS::CompileOffThreadModule(cx, options,
-                                    aRequest->mScriptTextBuf, aRequest->mScriptTextLength,
-                                    OffThreadScriptLoaderCallback,
-                                    static_cast<void*>(runnable))) {
-      return NS_ERROR_OUT_OF_MEMORY;
-    }
-  } else {
-    if (!JS::CompileOffThread(cx, options,
-                              aRequest->mScriptTextBuf, aRequest->mScriptTextLength,
-                              OffThreadScriptLoaderCallback,
-                              static_cast<void*>(runnable))) {
-      return NS_ERROR_OUT_OF_MEMORY;
-    }
-  }
-
-  mDocument->BlockOnload();
-  aRequest->mProgress = nsScriptLoadRequest::Progress::Compiling;
-
-  Unused << runnable.forget();
-  return NS_OK;
-}
-
-nsresult
-nsScriptLoader::CompileOffThreadOrProcessRequest(nsScriptLoadRequest* aRequest)
-{
-  NS_ASSERTION(nsContentUtils::IsSafeToRunScript(),
-               "Processing requests when running scripts is unsafe.");
-  NS_ASSERTION(!aRequest->mOffThreadToken,
-               "Candidate for off-thread compile is already parsed off-thread");
-  NS_ASSERTION(!aRequest->InCompilingStage(),
-               "Candidate for off-thread compile is already in compiling stage.");
-
-  nsresult rv = AttemptAsyncScriptCompile(aRequest);
-  if (NS_SUCCEEDED(rv)) {
-    return rv;
-  }
-
-  return ProcessRequest(aRequest);
-}
-
-SourceBufferHolder
-nsScriptLoader::GetScriptSource(nsScriptLoadRequest* aRequest, nsAutoString& inlineData)
-{
-  // Return a SourceBufferHolder object holding the script's source text.
-  // |inlineData| is used to hold the text for inline objects.
-
-  // If there's no script text, we try to get it from the element
-  if (aRequest->mIsInline) {
-    // XXX This is inefficient - GetText makes multiple
-    // copies.
-    aRequest->mElement->GetScriptText(inlineData);
-    return SourceBufferHolder(inlineData.get(),
-                              inlineData.Length(),
-                              SourceBufferHolder::NoOwnership);
-  }
-
-  return SourceBufferHolder(aRequest->mScriptTextBuf,
-                            aRequest->mScriptTextLength,
-                            SourceBufferHolder::NoOwnership);
-}
-
-nsresult
-nsScriptLoader::ProcessRequest(nsScriptLoadRequest* aRequest)
-{
-  NS_ASSERTION(nsContentUtils::IsSafeToRunScript(),
-               "Processing requests when running scripts is unsafe.");
-  NS_ASSERTION(aRequest->IsReadyToRun(),
-               "Processing a request that is not ready to run.");
-
-  NS_ENSURE_ARG(aRequest);
-
-  if (aRequest->IsModuleRequest() &&
-      !aRequest->AsModuleRequest()->mModuleScript)
-  {
-    // There was an error parsing a module script.  Nothing to do here.
-    FireScriptAvailable(NS_ERROR_FAILURE, aRequest);
-    return NS_OK;
-  }
-
-  nsCOMPtr<nsINode> scriptElem = do_QueryInterface(aRequest->mElement);
-
-  nsCOMPtr<nsIDocument> doc;
-  if (!aRequest->mIsInline) {
-    doc = scriptElem->OwnerDoc();
-  }
-
-  nsCOMPtr<nsIScriptElement> oldParserInsertedScript;
-  uint32_t parserCreated = aRequest->mElement->GetParserCreated();
-  if (parserCreated) {
-    oldParserInsertedScript = mCurrentParserInsertedScript;
-    mCurrentParserInsertedScript = aRequest->mElement;
-  }
-
-  aRequest->mElement->BeginEvaluating();
-
-  FireScriptAvailable(NS_OK, aRequest);
-
-  // The window may have gone away by this point, in which case there's no point
-  // in trying to run the script.
-  nsCOMPtr<nsIDocument> master = mDocument->MasterDocument();
-  {
-    // Try to perform a microtask checkpoint
-    nsAutoMicroTask mt;
-  }
-
-  nsPIDOMWindowInner *pwin = master->GetInnerWindow();
-  bool runScript = !!pwin;
-  if (runScript) {
-    nsContentUtils::DispatchTrustedEvent(scriptElem->OwnerDoc(),
-                                         scriptElem,
-                                         NS_LITERAL_STRING("beforescriptexecute"),
-                                         true, true, &runScript);
-  }
-
-  // Inner window could have gone away after firing beforescriptexecute
-  pwin = master->GetInnerWindow();
-  if (!pwin) {
-    runScript = false;
-  }
-
-  nsresult rv = NS_OK;
-  if (runScript) {
-    if (doc) {
-      doc->BeginEvaluatingExternalScript();
-    }
-    rv = EvaluateScript(aRequest);
-    if (doc) {
-      doc->EndEvaluatingExternalScript();
-    }
-
-    nsContentUtils::DispatchTrustedEvent(scriptElem->OwnerDoc(),
-                                         scriptElem,
-                                         NS_LITERAL_STRING("afterscriptexecute"),
-                                         true, false);
-  }
-
-  FireScriptEvaluated(rv, aRequest);
-
-  aRequest->mElement->EndEvaluating();
-
-  if (parserCreated) {
-    mCurrentParserInsertedScript = oldParserInsertedScript;
-  }
-
-  if (aRequest->mOffThreadToken) {
-    // The request was parsed off-main-thread, but the result of the off
-    // thread parse was not actually needed to process the request
-    // (disappearing window, some other error, ...). Finish the
-    // request to avoid leaks in the JS engine.
-    MOZ_ASSERT(!aRequest->IsModuleRequest());
-    aRequest->MaybeCancelOffThreadScript();
-  }
-
-  // Free any source data.
-  free(aRequest->mScriptTextBuf);
-  aRequest->mScriptTextBuf = nullptr;
-  aRequest->mScriptTextLength = 0;
-
-  return rv;
-}
-
-void
-nsScriptLoader::FireScriptAvailable(nsresult aResult,
-                                    nsScriptLoadRequest* aRequest)
-{
-  for (int32_t i = 0; i < mObservers.Count(); i++) {
-    nsCOMPtr<nsIScriptLoaderObserver> obs = mObservers[i];
-    obs->ScriptAvailable(aResult, aRequest->mElement,
-                         aRequest->mIsInline, aRequest->mURI,
-                         aRequest->mLineNo);
-  }
-
-  aRequest->FireScriptAvailable(aResult);
-}
-
-void
-nsScriptLoader::FireScriptEvaluated(nsresult aResult,
-                                    nsScriptLoadRequest* aRequest)
-{
-  for (int32_t i = 0; i < mObservers.Count(); i++) {
-    nsCOMPtr<nsIScriptLoaderObserver> obs = mObservers[i];
-    obs->ScriptEvaluated(aResult, aRequest->mElement,
-                         aRequest->mIsInline);
-  }
-
-  aRequest->FireScriptEvaluated(aResult);
-}
-
-already_AddRefed<nsIScriptGlobalObject>
-nsScriptLoader::GetScriptGlobalObject()
-{
-  nsCOMPtr<nsIDocument> master = mDocument->MasterDocument();
-  nsPIDOMWindowInner *pwin = master->GetInnerWindow();
-  if (!pwin) {
-    return nullptr;
-  }
-
-  nsCOMPtr<nsIScriptGlobalObject> globalObject = do_QueryInterface(pwin);
-  NS_ASSERTION(globalObject, "windows must be global objects");
-
-  // and make sure we are setup for this type of script.
-  nsresult rv = globalObject->EnsureScriptEnvironment();
-  if (NS_FAILED(rv)) {
-    return nullptr;
-  }
-
-  return globalObject.forget();
-}
-
-nsresult
-nsScriptLoader::FillCompileOptionsForRequest(const AutoJSAPI&jsapi,
-                                             nsScriptLoadRequest* aRequest,
-                                             JS::Handle<JSObject*> aScopeChain,
-                                             JS::CompileOptions* aOptions)
-{
-  // It's very important to use aRequest->mURI, not the final URI of the channel
-  // aRequest ended up getting script data from, as the script filename.
-  nsresult rv;
-  nsContentUtils::GetWrapperSafeScriptFilename(mDocument, aRequest->mURI,
-                                               aRequest->mURL, &rv);
-  if (NS_WARN_IF(NS_FAILED(rv))) {
-    return rv;
-  }
-
-  bool isScriptElement = !aRequest->IsModuleRequest() ||
-                         aRequest->AsModuleRequest()->IsTopLevel();
-  aOptions->setIntroductionType(isScriptElement ? "scriptElement"
-                                                : "importedModule");
-  aOptions->setFileAndLine(aRequest->mURL.get(), aRequest->mLineNo);
-  aOptions->setVersion(JSVersion(aRequest->mJSVersion));
-  aOptions->setIsRunOnce(true);
-  // We only need the setNoScriptRval bit when compiling off-thread here, since
-  // otherwise nsJSUtils::EvaluateString will set it up for us.
-  aOptions->setNoScriptRval(true);
-  if (aRequest->mHasSourceMapURL) {
-    aOptions->setSourceMapURL(aRequest->mSourceMapURL.get());
-  }
-  if (aRequest->mOriginPrincipal) {
-    nsIPrincipal* scriptPrin = nsContentUtils::ObjectPrincipal(aScopeChain);
-    bool subsumes = scriptPrin->Subsumes(aRequest->mOriginPrincipal);
-    aOptions->setMutedErrors(!subsumes);
-  }
-
-  JSContext* cx = jsapi.cx();
-  JS::Rooted<JS::Value> elementVal(cx);
-  MOZ_ASSERT(aRequest->mElement);
-  if (NS_SUCCEEDED(nsContentUtils::WrapNative(cx, aRequest->mElement,
-                                              &elementVal,
-                                              /* aAllowWrapping = */ true))) {
-    MOZ_ASSERT(elementVal.isObject());
-    aOptions->setElement(&elementVal.toObject());
-  }
-
-  return NS_OK;
-}
-
-nsresult
-nsScriptLoader::EvaluateScript(nsScriptLoadRequest* aRequest)
-{
-  // We need a document to evaluate scripts.
-  if (!mDocument) {
-    return NS_ERROR_FAILURE;
-  }
-
-  nsCOMPtr<nsIContent> scriptContent(do_QueryInterface(aRequest->mElement));
-  nsIDocument* ownerDoc = scriptContent->OwnerDoc();
-  if (ownerDoc != mDocument) {
-    // Willful violation of HTML5 as of 2010-12-01
-    return NS_ERROR_FAILURE;
-  }
-
-  // Get the script-type to be used by this element.
-  NS_ASSERTION(scriptContent, "no content - what is default script-type?");
-
-  nsCOMPtr<nsIScriptGlobalObject> globalObject = GetScriptGlobalObject();
-  if (!globalObject) {
-    return NS_ERROR_FAILURE;
-  }
-
-  // Make sure context is a strong reference since we access it after
-  // we've executed a script, which may cause all other references to
-  // the context to go away.
-  nsCOMPtr<nsIScriptContext> context = globalObject->GetScriptContext();
-  if (!context) {
-    return NS_ERROR_FAILURE;
-  }
-
-  JSVersion version = JSVersion(aRequest->mJSVersion);
-  if (version == JSVERSION_UNKNOWN) {
-    return NS_OK;
-  }
-
-  // New script entry point required, due to the "Create a script" sub-step of
-  // http://www.whatwg.org/specs/web-apps/current-work/#execute-the-script-block
-  nsAutoMicroTask mt;
-  AutoEntryScript aes(globalObject, "<script> element", true);
-  JS::Rooted<JSObject*> global(aes.cx(),
-                               globalObject->GetGlobalJSObject());
-
-  bool oldProcessingScriptTag = context->GetProcessingScriptTag();
-  context->SetProcessingScriptTag(true);
-  nsresult rv;
-  {
-    // Update our current script.
-    AutoCurrentScriptUpdater scriptUpdater(this, aRequest->mElement);
-    Maybe<AutoCurrentScriptUpdater> masterScriptUpdater;
-    nsCOMPtr<nsIDocument> master = mDocument->MasterDocument();
-    if (master != mDocument) {
-      // If this script belongs to an import document, it will be
-      // executed in the context of the master document. During the
-      // execution currentScript of the master should refer to this
-      // script. So let's update the mCurrentScript of the ScriptLoader
-      // of the master document too.
-      masterScriptUpdater.emplace(master->ScriptLoader(),
-                                  aRequest->mElement);
-    }
-
-    if (aRequest->IsModuleRequest()) {
-      nsModuleLoadRequest* request = aRequest->AsModuleRequest();
-      MOZ_ASSERT(request->mModuleScript);
-      MOZ_ASSERT(!request->mOffThreadToken);
-      nsModuleScript* ms = request->mModuleScript;
-      MOZ_ASSERT(!ms->IsUninstantiated());
-      if (ms->InstantiationFailed()) {
-        JS::Rooted<JS::Value> exception(aes.cx(), ms->Exception());
-        JS_SetPendingException(aes.cx(), exception);
-        rv = NS_ERROR_FAILURE;
-      } else {
-        JS::Rooted<JSObject*> module(aes.cx(), ms->ModuleRecord());
-        MOZ_ASSERT(module);
-        rv = nsJSUtils::ModuleEvaluation(aes.cx(), module);
-      }
-    } else {
-      JS::CompileOptions options(aes.cx());
-      rv = FillCompileOptionsForRequest(aes, aRequest, global, &options);
-
-      if (NS_SUCCEEDED(rv)) {
-        nsAutoString inlineData;
-        SourceBufferHolder srcBuf = GetScriptSource(aRequest, inlineData);
-        rv = nsJSUtils::EvaluateString(aes.cx(), srcBuf, global, options,
-                                       aRequest->OffThreadTokenPtr());
-      }
-    }
-  }
-
-  context->SetProcessingScriptTag(oldProcessingScriptTag);
-  return rv;
-}
-
-void
-nsScriptLoader::ProcessPendingRequestsAsync()
-{
-  if (mParserBlockingRequest ||
-      !mXSLTRequests.isEmpty() ||
-      !mLoadedAsyncRequests.isEmpty() ||
-      !mNonAsyncExternalScriptInsertedRequests.isEmpty() ||
-      !mDeferRequests.isEmpty() ||
-      !mPendingChildLoaders.IsEmpty()) {
-    NS_DispatchToCurrentThread(NewRunnableMethod(this,
-                                                 &nsScriptLoader::ProcessPendingRequests));
-  }
-}
-
-void
-nsScriptLoader::ProcessPendingRequests()
-{
-  RefPtr<nsScriptLoadRequest> request;
-
-  if (mParserBlockingRequest &&
-      mParserBlockingRequest->IsReadyToRun() &&
-      ReadyToExecuteParserBlockingScripts()) {
-    request.swap(mParserBlockingRequest);
-    UnblockParser(request);
-    ProcessRequest(request);
-    if (request->mWasCompiledOMT) {
-      mDocument->UnblockOnload(false);
-    }
-    ContinueParserAsync(request);
-  }
-
-  while (ReadyToExecuteParserBlockingScripts() &&
-         !mXSLTRequests.isEmpty() &&
-         mXSLTRequests.getFirst()->IsReadyToRun()) {
-    request = mXSLTRequests.StealFirst();
-    ProcessRequest(request);
-  }
-
-  while (ReadyToExecuteScripts() && !mLoadedAsyncRequests.isEmpty()) {
-    request = mLoadedAsyncRequests.StealFirst();
-    if (request->IsModuleRequest()) {
-      ProcessRequest(request);
-    } else {
-      CompileOffThreadOrProcessRequest(request);
-    }
-  }
-
-  while (ReadyToExecuteScripts() &&
-         !mNonAsyncExternalScriptInsertedRequests.isEmpty() &&
-         mNonAsyncExternalScriptInsertedRequests.getFirst()->IsReadyToRun()) {
-    // Violate the HTML5 spec and execute these in the insertion order in
-    // order to make LABjs and the "order" plug-in for RequireJS work with
-    // their Gecko-sniffed code path. See
-    // http://lists.w3.org/Archives/Public/public-html/2010Oct/0088.html
-    request = mNonAsyncExternalScriptInsertedRequests.StealFirst();
-    ProcessRequest(request);
-  }
-
-  if (mDocumentParsingDone && mXSLTRequests.isEmpty()) {
-    while (ReadyToExecuteScripts() &&
-           !mDeferRequests.isEmpty() &&
-           mDeferRequests.getFirst()->IsReadyToRun()) {
-      request = mDeferRequests.StealFirst();
-      ProcessRequest(request);
-    }
-  }
-
-  while (!mPendingChildLoaders.IsEmpty() &&
-         ReadyToExecuteParserBlockingScripts()) {
-    RefPtr<nsScriptLoader> child = mPendingChildLoaders[0];
-    mPendingChildLoaders.RemoveElementAt(0);
-    child->RemoveParserBlockingScriptExecutionBlocker();
-  }
-
-  if (mDocumentParsingDone && mDocument && !mParserBlockingRequest &&
-      mNonAsyncExternalScriptInsertedRequests.isEmpty() &&
-      mXSLTRequests.isEmpty() && mDeferRequests.isEmpty() &&
-      MaybeRemovedDeferRequests()) {
-    return ProcessPendingRequests();
-  }
-
-  if (mDocumentParsingDone && mDocument &&
-      !mParserBlockingRequest && mLoadingAsyncRequests.isEmpty() &&
-      mLoadedAsyncRequests.isEmpty() &&
-      mNonAsyncExternalScriptInsertedRequests.isEmpty() &&
-      mXSLTRequests.isEmpty() && mDeferRequests.isEmpty()) {
-    // No more pending scripts; time to unblock onload.
-    // OK to unblock onload synchronously here, since callers must be
-    // prepared for the world changing anyway.
-    mDocumentParsingDone = false;
-    mDocument->UnblockOnload(true);
-  }
-}
-
-bool
-nsScriptLoader::ReadyToExecuteParserBlockingScripts()
-{
-  // Make sure the SelfReadyToExecuteParserBlockingScripts check is first, so
-  // that we don't block twice on an ancestor.
-  if (!SelfReadyToExecuteParserBlockingScripts()) {
-    return false;
-  }
-
-  for (nsIDocument* doc = mDocument; doc; doc = doc->GetParentDocument()) {
-    nsScriptLoader* ancestor = doc->ScriptLoader();
-    if (!ancestor->SelfReadyToExecuteParserBlockingScripts() &&
-        ancestor->AddPendingChildLoader(this)) {
-      AddParserBlockingScriptExecutionBlocker();
-      return false;
-    }
-  }
-
-  if (mDocument && !mDocument->IsMasterDocument()) {
-    RefPtr<ImportManager> im = mDocument->ImportManager();
-    RefPtr<ImportLoader> loader = im->Find(mDocument);
-    MOZ_ASSERT(loader, "How can we have an import document without a loader?");
-
-    // The referring link that counts in the execution order calculation
-    // (in spec: flagged as branch)
-    nsCOMPtr<nsINode> referrer = loader->GetMainReferrer();
-    MOZ_ASSERT(referrer, "There has to be a main referring link for each imports");
-
-    // Import documents are blocked by their import predecessors. We need to
-    // wait with script execution until all the predecessors are done.
-    // Technically it means we have to wait for the last one to finish,
-    // which is the neares one to us in the order.
-    RefPtr<ImportLoader> lastPred = im->GetNearestPredecessor(referrer);
-    if (!lastPred) {
-      // If there is no predecessor we can run.
-      return true;
-    }
-
-    nsCOMPtr<nsIDocument> doc = lastPred->GetDocument();
-    if (lastPred->IsBlocking() || !doc ||
-        !doc->ScriptLoader()->SelfReadyToExecuteParserBlockingScripts()) {
-      // Document has not been created yet or it was created but not ready.
-      // Either case we are blocked by it. The ImportLoader will take care
-      // of blocking us, and adding the pending child loader to the blocking
-      // ScriptLoader when it's possible (at this point the blocking loader
-      // might not have created the document/ScriptLoader)
-      lastPred->AddBlockedScriptLoader(this);
-      // As more imports are parsed, this can change, let's cache what we
-      // blocked, so it can be later updated if needed (see: ImportLoader::Updater).
-      loader->SetBlockingPredecessor(lastPred);
-      return false;
-    }
-  }
-
-  return true;
-}
-
-/* static */ nsresult
-nsScriptLoader::ConvertToUTF16(nsIChannel* aChannel, const uint8_t* aData,
-                               uint32_t aLength, const nsAString& aHintCharset,
-                               nsIDocument* aDocument,
-                               char16_t*& aBufOut, size_t& aLengthOut)
-{
-  if (!aLength) {
-    aBufOut = nullptr;
-    aLengthOut = 0;
-    return NS_OK;
-  }
-
-  // The encoding info precedence is as follows from high to low:
-  // The BOM
-  // HTTP Content-Type (if name recognized)
-  // charset attribute (if name recognized)
-  // The encoding of the document
-
-  nsAutoCString charset;
-
-  nsCOMPtr<nsIUnicodeDecoder> unicodeDecoder;
-
-  if (nsContentUtils::CheckForBOM(aData, aLength, charset)) {
-    // charset is now one of "UTF-16BE", "UTF-16BE" or "UTF-8".  Those decoder
-    // will take care of swallowing the BOM.
-    unicodeDecoder = EncodingUtils::DecoderForEncoding(charset);
-  }
-
-  if (!unicodeDecoder &&
-      aChannel &&
-      NS_SUCCEEDED(aChannel->GetContentCharset(charset)) &&
-      EncodingUtils::FindEncodingForLabel(charset, charset)) {
-    unicodeDecoder = EncodingUtils::DecoderForEncoding(charset);
-  }
-
-  if (!unicodeDecoder &&
-      EncodingUtils::FindEncodingForLabel(aHintCharset, charset)) {
-    unicodeDecoder = EncodingUtils::DecoderForEncoding(charset);
-  }
-
-  if (!unicodeDecoder && aDocument) {
-    charset = aDocument->GetDocumentCharacterSet();
-    unicodeDecoder = EncodingUtils::DecoderForEncoding(charset);
-  }
-
-  if (!unicodeDecoder) {
-    // Curiously, there are various callers that don't pass aDocument. The
-    // fallback in the old code was ISO-8859-1, which behaved like
-    // windows-1252. Saying windows-1252 for clarity and for compliance
-    // with the Encoding Standard.
-    unicodeDecoder = EncodingUtils::DecoderForEncoding("windows-1252");
-  }
-
-  int32_t unicodeLength = 0;
-
-  nsresult rv =
-    unicodeDecoder->GetMaxLength(reinterpret_cast<const char*>(aData),
-                                 aLength, &unicodeLength);
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  aBufOut = static_cast<char16_t*>(js_malloc(unicodeLength * sizeof(char16_t)));
-  if (!aBufOut) {
-    aLengthOut = 0;
-    return NS_ERROR_OUT_OF_MEMORY;
-  }
-  aLengthOut = unicodeLength;
-
-  rv = unicodeDecoder->Convert(reinterpret_cast<const char*>(aData),
-                               (int32_t *) &aLength, aBufOut,
-                               &unicodeLength);
-  MOZ_ASSERT(NS_SUCCEEDED(rv));
-  aLengthOut = unicodeLength;
-  if (NS_FAILED(rv)) {
-    js_free(aBufOut);
-    aBufOut = nullptr;
-    aLengthOut = 0;
-  }
-  return rv;
-}
-
-nsresult
-nsScriptLoader::OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
-                                 nsISupports* aContext,
-                                 nsresult aChannelStatus,
-                                 nsresult aSRIStatus,
-                                 mozilla::Vector<char16_t> &aString,
-                                 mozilla::dom::SRICheckDataVerifier* aSRIDataVerifier)
-{
-  nsScriptLoadRequest* request = static_cast<nsScriptLoadRequest*>(aContext);
-  NS_ASSERTION(request, "null request in stream complete handler");
-  NS_ENSURE_TRUE(request, NS_ERROR_FAILURE);
-
-  nsCOMPtr<nsIRequest> channelRequest;
-  aLoader->GetRequest(getter_AddRefs(channelRequest));
-  nsCOMPtr<nsIChannel> channel;
-  channel = do_QueryInterface(channelRequest);
-
-  nsresult rv = NS_OK;
-  if (!request->mIntegrity.IsEmpty() &&
-      NS_SUCCEEDED((rv = aSRIStatus))) {
-    MOZ_ASSERT(aSRIDataVerifier);
-    MOZ_ASSERT(mReporter);
-
-    nsAutoCString sourceUri;
-    if (mDocument && mDocument->GetDocumentURI()) {
-      mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
-    }
-    rv = aSRIDataVerifier->Verify(request->mIntegrity, channel, sourceUri,
-                                  mReporter);
-    mReporter->FlushConsoleReports(mDocument);
-    if (NS_FAILED(rv)) {
-      rv = NS_ERROR_SRI_CORRUPT;
-    }
-  } else {
-    nsCOMPtr<nsILoadInfo> loadInfo = channel->GetLoadInfo();
-
-    if (loadInfo->GetEnforceSRI()) {
-      MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug,
-             ("nsScriptLoader::OnStreamComplete, required SRI not found"));
-      nsCOMPtr<nsIContentSecurityPolicy> csp;
-      loadInfo->LoadingPrincipal()->GetCsp(getter_AddRefs(csp));
-      nsAutoCString violationURISpec;
-      mDocument->GetDocumentURI()->GetAsciiSpec(violationURISpec);
-      uint32_t lineNo = request->mElement ? request->mElement->GetScriptLineNumber() : 0;
-      csp->LogViolationDetails(
-        nsIContentSecurityPolicy::VIOLATION_TYPE_REQUIRE_SRI_FOR_SCRIPT,
-        NS_ConvertUTF8toUTF16(violationURISpec),
-        EmptyString(), lineNo, EmptyString(), EmptyString());
-      rv = NS_ERROR_SRI_CORRUPT;
-    }
-  }
-
-  if (NS_SUCCEEDED(rv)) {
-    rv = PrepareLoadedRequest(request, aLoader, aChannelStatus, aString);
-  }
-
-  if (NS_FAILED(rv)) {
-    /*
-     * Handle script not loading error because source was a tracking URL.
-     * We make a note of this script node by including it in a dedicated
-     * array of blocked tracking nodes under its parent document.
-     */
-    if (rv == NS_ERROR_TRACKING_URI) {
-      nsCOMPtr<nsIContent> cont = do_QueryInterface(request->mElement);
-      mDocument->AddBlockedTrackingNode(cont);
-    }
-
-    if (request->mIsDefer) {
-      MOZ_ASSERT_IF(request->IsModuleRequest(),
-                    request->AsModuleRequest()->IsTopLevel());
-      if (request->isInList()) {
-        RefPtr<nsScriptLoadRequest> req = mDeferRequests.Steal(request);
-        FireScriptAvailable(rv, req);
-      }
-    } else if (request->mIsAsync) {
-      MOZ_ASSERT_IF(request->IsModuleRequest(),
-                    request->AsModuleRequest()->IsTopLevel());
-      if (request->isInList()) {
-        RefPtr<nsScriptLoadRequest> req = mLoadingAsyncRequests.Steal(request);
-        FireScriptAvailable(rv, req);
-      }
-    } else if (request->mIsNonAsyncScriptInserted) {
-      if (request->isInList()) {
-        RefPtr<nsScriptLoadRequest> req =
-          mNonAsyncExternalScriptInsertedRequests.Steal(request);
-        FireScriptAvailable(rv, req);
-      }
-    } else if (request->mIsXSLT) {
-      if (request->isInList()) {
-        RefPtr<nsScriptLoadRequest> req = mXSLTRequests.Steal(request);
-        FireScriptAvailable(rv, req);
-      }
-    } else if (request->IsModuleRequest()) {
-      nsModuleLoadRequest* modReq = request->AsModuleRequest();
-      MOZ_ASSERT(!modReq->IsTopLevel());
-      MOZ_ASSERT(!modReq->isInList());
-      modReq->Cancel();
-      FireScriptAvailable(rv, request);
-    } else if (mParserBlockingRequest == request) {
-      MOZ_ASSERT(!request->isInList());
-      mParserBlockingRequest = nullptr;
-      UnblockParser(request);
-
-      // Ensure that we treat request->mElement as our current parser-inserted
-      // script while firing onerror on it.
-      MOZ_ASSERT(request->mElement->GetParserCreated());
-      nsCOMPtr<nsIScriptElement> oldParserInsertedScript =
-        mCurrentParserInsertedScript;
-      mCurrentParserInsertedScript = request->mElement;
-      FireScriptAvailable(rv, request);
-      ContinueParserAsync(request);
-      mCurrentParserInsertedScript = oldParserInsertedScript;
-    } else {
-      mPreloads.RemoveElement(request, PreloadRequestComparator());
-    }
-  }
-
-  // Process our request and/or any pending ones
-  ProcessPendingRequests();
-
-  return NS_OK;
-}
-
-void
-nsScriptLoader::UnblockParser(nsScriptLoadRequest* aParserBlockingRequest)
-{
-  aParserBlockingRequest->mElement->UnblockParser();
-}
-
-void
-nsScriptLoader::ContinueParserAsync(nsScriptLoadRequest* aParserBlockingRequest)
-{
-  aParserBlockingRequest->mElement->ContinueParserAsync();
-}
-
-uint32_t
-nsScriptLoader::NumberOfProcessors()
-{
-  if (mNumberOfProcessors > 0)
-    return mNumberOfProcessors;
-
-  int32_t numProcs = PR_GetNumberOfProcessors();
-  if (numProcs > 0)
-    mNumberOfProcessors = numProcs;
-  return mNumberOfProcessors;
-}
-
-void
-nsScriptLoader::MaybeMoveToLoadedList(nsScriptLoadRequest* aRequest)
-{
-  MOZ_ASSERT(aRequest->IsReadyToRun());
-
-  // If it's async, move it to the loaded list.  aRequest->mIsAsync really
-  // _should_ be in a list, but the consequences if it's not are bad enough we
-  // want to avoid trying to move it if it's not.
-  if (aRequest->mIsAsync) {
-    MOZ_ASSERT(aRequest->isInList());
-    if (aRequest->isInList()) {
-      RefPtr<nsScriptLoadRequest> req = mLoadingAsyncRequests.Steal(aRequest);
-      mLoadedAsyncRequests.AppendElement(req);
-    }
-  }
-}
-
-nsresult
-nsScriptLoader::PrepareLoadedRequest(nsScriptLoadRequest* aRequest,
-                                     nsIIncrementalStreamLoader* aLoader,
-                                     nsresult aStatus,
-                                     mozilla::Vector<char16_t> &aString)
-{
-  if (NS_FAILED(aStatus)) {
-    return aStatus;
-  }
-
-  if (aRequest->IsCanceled()) {
-    return NS_BINDING_ABORTED;
-  }
-
-  // If we don't have a document, then we need to abort further
-  // evaluation.
-  if (!mDocument) {
-    return NS_ERROR_NOT_AVAILABLE;
-  }
-
-  // If the load returned an error page, then we need to abort
-  nsCOMPtr<nsIRequest> req;
-  nsresult rv = aLoader->GetRequest(getter_AddRefs(req));
-  NS_ASSERTION(req, "StreamLoader's request went away prematurely");
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(req);
-  if (httpChannel) {
-    bool requestSucceeded;
-    rv = httpChannel->GetRequestSucceeded(&requestSucceeded);
-    if (NS_SUCCEEDED(rv) && !requestSucceeded) {
-      return NS_ERROR_NOT_AVAILABLE;
-    }
-
-    nsAutoCString sourceMapURL;
-    rv = httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("SourceMap"), sourceMapURL);
-    if (NS_FAILED(rv)) {
-      rv = httpChannel->GetResponseHeader(NS_LITERAL_CSTRING("X-SourceMap"), sourceMapURL);
-    }
-    if (NS_SUCCEEDED(rv)) {
-      aRequest->mHasSourceMapURL = true;
-      aRequest->mSourceMapURL = NS_ConvertUTF8toUTF16(sourceMapURL);
-    }
-  }
-
-  nsCOMPtr<nsIChannel> channel = do_QueryInterface(req);
-  // If this load was subject to a CORS check; don't flag it with a
-  // separate origin principal, so that it will treat our document's
-  // principal as the origin principal
-  if (aRequest->mCORSMode == CORS_NONE) {
-    rv = nsContentUtils::GetSecurityManager()->
-      GetChannelResultPrincipal(channel, getter_AddRefs(aRequest->mOriginPrincipal));
-    NS_ENSURE_SUCCESS(rv, rv);
-  }
-
-  if (!aString.empty()) {
-    aRequest->mScriptTextLength = aString.length();
-    aRequest->mScriptTextBuf = aString.extractOrCopyRawBuffer();
-  }
-
-  // This assertion could fire errorously if we ran out of memory when
-  // inserting the request in the array. However it's an unlikely case
-  // so if you see this assertion it is likely something else that is
-  // wrong, especially if you see it more than once.
-  NS_ASSERTION(mDeferRequests.Contains(aRequest) ||
-               mLoadingAsyncRequests.Contains(aRequest) ||
-               mNonAsyncExternalScriptInsertedRequests.Contains(aRequest) ||
-               mXSLTRequests.Contains(aRequest)  ||
-               (aRequest->IsModuleRequest() &&
-                !aRequest->AsModuleRequest()->IsTopLevel() &&
-                !aRequest->isInList()) ||
-               mPreloads.Contains(aRequest, PreloadRequestComparator()) ||
-               mParserBlockingRequest,
-               "aRequest should be pending!");
-
-  if (aRequest->IsModuleRequest()) {
-    nsModuleLoadRequest* request = aRequest->AsModuleRequest();
-
-    // When loading a module, only responses with a JavaScript MIME type are
-    // acceptable.
-    nsAutoCString mimeType;
-    channel->GetContentType(mimeType);
-    NS_ConvertUTF8toUTF16 typeString(mimeType);
-    if (!nsContentUtils::IsJavascriptMIMEType(typeString)) {
-      return NS_ERROR_FAILURE;
-    }
-
-    channel->GetURI(getter_AddRefs(request->mBaseURL));
-
-    // Attempt to compile off main thread.
-    rv = AttemptAsyncScriptCompile(request);
-    if (NS_SUCCEEDED(rv)) {
-      return rv;
-    }
-
-    // Otherwise compile it right away and start fetching descendents.
-    return ProcessFetchedModuleSource(request);
-  }
-
-  // The script is now loaded and ready to run.
-  aRequest->SetReady();
-
-  // If this is currently blocking the parser, attempt to compile it off-main-thread.
-  if (aRequest == mParserBlockingRequest && (NumberOfProcessors() > 1)) {
-    MOZ_ASSERT(!aRequest->IsModuleRequest());
-    nsresult rv = AttemptAsyncScriptCompile(aRequest);
-    if (rv == NS_OK) {
-      MOZ_ASSERT(aRequest->mProgress == nsScriptLoadRequest::Progress::Compiling,
-                 "Request should be off-thread compiling now.");
-      return NS_OK;
-    }
-
-    // If off-thread compile errored, return the error.
-    if (rv != NS_ERROR_FAILURE) {
-      return rv;
-    }
-
-    // If off-thread compile was rejected, continue with regular processing.
-  }
-
-  MaybeMoveToLoadedList(aRequest);
-
-  return NS_OK;
-}
-
-void
-nsScriptLoader::ParsingComplete(bool aTerminated)
-{
-  if (mDeferEnabled) {
-    // Have to check because we apparently get ParsingComplete
-    // without BeginDeferringScripts in some cases
-    mDocumentParsingDone = true;
-  }
-  mDeferEnabled = false;
-  if (aTerminated) {
-    mDeferRequests.Clear();
-    mLoadingAsyncRequests.Clear();
-    mLoadedAsyncRequests.Clear();
-    mNonAsyncExternalScriptInsertedRequests.Clear();
-    mXSLTRequests.Clear();
-    if (mParserBlockingRequest) {
-      mParserBlockingRequest->Cancel();
-      mParserBlockingRequest = nullptr;
-    }
-  }
-
-  // Have to call this even if aTerminated so we'll correctly unblock
-  // onload and all.
-  ProcessPendingRequests();
-}
-
-void
-nsScriptLoader::PreloadURI(nsIURI *aURI, const nsAString &aCharset,
-                           const nsAString &aType,
-                           const nsAString &aCrossOrigin,
-                           const nsAString& aIntegrity,
-                           bool aScriptFromHead,
-                           const mozilla::net::ReferrerPolicy aReferrerPolicy)
-{
-  NS_ENSURE_TRUE_VOID(mDocument);
-  // Check to see if scripts has been turned off.
-  if (!mEnabled || !mDocument->IsScriptEnabled()) {
-    return;
-  }
-
-  // TODO: Preload module scripts.
-  if (ModuleScriptsEnabled() && aType.LowerCaseEqualsASCII("module")) {
-    return;
-  }
-
-  SRIMetadata sriMetadata;
-  if (!aIntegrity.IsEmpty()) {
-    MOZ_LOG(SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug,
-           ("nsScriptLoader::PreloadURI, integrity=%s",
-            NS_ConvertUTF16toUTF8(aIntegrity).get()));
-    nsAutoCString sourceUri;
-    if (mDocument->GetDocumentURI()) {
-      mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri);
-    }
-    SRICheck::IntegrityMetadata(aIntegrity, sourceUri, mReporter, &sriMetadata);
-  }
-
-  RefPtr<nsScriptLoadRequest> request =
-    CreateLoadRequest(nsScriptKind::Classic, nullptr, 0,
-                      Element::StringToCORSMode(aCrossOrigin), sriMetadata);
-  request->mURI = aURI;
-  request->mIsInline = false;
-  request->mReferrerPolicy = aReferrerPolicy;
-
-  nsresult rv = StartLoad(request, aType, aScriptFromHead);
-  if (NS_FAILED(rv)) {
-    return;
-  }
-
-  PreloadInfo *pi = mPreloads.AppendElement();
-  pi->mRequest = request;
-  pi->mCharset = aCharset;
-}
-
-void
-nsScriptLoader::AddDeferRequest(nsScriptLoadRequest* aRequest)
-{
-  aRequest->mIsDefer = true;
-  mDeferRequests.AppendElement(aRequest);
-  if (mDeferEnabled && aRequest == mDeferRequests.getFirst() &&
-      mDocument && !mBlockingDOMContentLoaded) {
-    MOZ_ASSERT(mDocument->GetReadyStateEnum() == nsIDocument::READYSTATE_LOADING);
-    mBlockingDOMContentLoaded = true;
-    mDocument->BlockDOMContentLoaded();
-  }
-}
-
-bool
-nsScriptLoader::MaybeRemovedDeferRequests()
-{
-  if (mDeferRequests.isEmpty() && mDocument &&
-      mBlockingDOMContentLoaded) {
-    mBlockingDOMContentLoaded = false;
-    mDocument->UnblockDOMContentLoaded();
-    return true;
-  }
-  return false;
-}
-
-//////////////////////////////////////////////////////////////
-// nsScriptLoadHandler
-//////////////////////////////////////////////////////////////
-
-nsScriptLoadHandler::nsScriptLoadHandler(nsScriptLoader *aScriptLoader,
-                                         nsScriptLoadRequest *aRequest,
-                                         mozilla::dom::SRICheckDataVerifier *aSRIDataVerifier)
-  : mScriptLoader(aScriptLoader),
-    mRequest(aRequest),
-    mSRIDataVerifier(aSRIDataVerifier),
-    mSRIStatus(NS_OK),
-    mDecoder(),
-    mBuffer()
-{}
-
-nsScriptLoadHandler::~nsScriptLoadHandler()
-{}
-
-NS_IMPL_ISUPPORTS(nsScriptLoadHandler, nsIIncrementalStreamLoaderObserver)
-
-NS_IMETHODIMP
-nsScriptLoadHandler::OnIncrementalData(nsIIncrementalStreamLoader* aLoader,
-                                       nsISupports* aContext,
-                                       uint32_t aDataLength,
-                                       const uint8_t* aData,
-                                       uint32_t *aConsumedLength)
-{
-  if (mRequest->IsCanceled()) {
-    // If request cancelled, ignore any incoming data.
-    *aConsumedLength = aDataLength;
-    return NS_OK;
-  }
-
-  if (!EnsureDecoder(aLoader, aData, aDataLength,
-                     /* aEndOfStream = */ false)) {
-    return NS_OK;
-  }
-
-  // Below we will/shall consume entire data chunk.
-  *aConsumedLength = aDataLength;
-
-  // Decoder has already been initialized. -- trying to decode all loaded bytes.
-  nsresult rv = TryDecodeRawData(aData, aDataLength,
-                                 /* aEndOfStream = */ false);
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  // If SRI is required for this load, appending new bytes to the hash.
-  if (mSRIDataVerifier && NS_SUCCEEDED(mSRIStatus)) {
-    mSRIStatus = mSRIDataVerifier->Update(aDataLength, aData);
-  }
-
-  return rv;
-}
-
-nsresult
-nsScriptLoadHandler::TryDecodeRawData(const uint8_t* aData,
-                                      uint32_t aDataLength,
-                                      bool aEndOfStream)
-{
-  int32_t srcLen = aDataLength;
-  const char* src = reinterpret_cast<const char *>(aData);
-  int32_t dstLen;
-  nsresult rv =
-    mDecoder->GetMaxLength(src, srcLen, &dstLen);
-
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  uint32_t haveRead = mBuffer.length();
-
-  CheckedInt<uint32_t> capacity = haveRead;
-  capacity += dstLen;
-
-  if (!capacity.isValid() || !mBuffer.reserve(capacity.value())) {
-    return NS_ERROR_OUT_OF_MEMORY;
-  }
-
-  rv = mDecoder->Convert(src,
-                      &srcLen,
-                      mBuffer.begin() + haveRead,
-                      &dstLen);
-
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  haveRead += dstLen;
-  MOZ_ASSERT(haveRead <= capacity.value(), "mDecoder produced more data than expected");
-  MOZ_ALWAYS_TRUE(mBuffer.resizeUninitialized(haveRead));
-
-  return NS_OK;
-}
-
-bool
-nsScriptLoadHandler::EnsureDecoder(nsIIncrementalStreamLoader *aLoader,
-                                   const uint8_t* aData,
-                                   uint32_t aDataLength,
-                                   bool aEndOfStream)
-{
-  // Check if decoder has already been created.
-  if (mDecoder) {
-    return true;
-  }
-
-  nsAutoCString charset;
-
-  // JavaScript modules are always UTF-8.
-  if (mRequest->IsModuleRequest()) {
-    charset = "UTF-8";
-    mDecoder = EncodingUtils::DecoderForEncoding(charset);
-    return true;
-  }
-
-  // Determine if BOM check should be done.  This occurs either
-  // if end-of-stream has been reached, or at least 3 bytes have
-  // been read from input.
-  if (!aEndOfStream && (aDataLength < 3)) {
-    return false;
-  }
-
-  // Do BOM detection.
-  if (nsContentUtils::CheckForBOM(aData, aDataLength, charset)) {
-    mDecoder = EncodingUtils::DecoderForEncoding(charset);
-    return true;
-  }
-
-  // BOM detection failed, check content stream for charset.
-  nsCOMPtr<nsIRequest> req;
-  nsresult rv = aLoader->GetRequest(getter_AddRefs(req));
-  NS_ASSERTION(req, "StreamLoader's request went away prematurely");
-  NS_ENSURE_SUCCESS(rv, false);
-
-  nsCOMPtr<nsIChannel> channel = do_QueryInterface(req);
-
-  if (channel &&
-      NS_SUCCEEDED(channel->GetContentCharset(charset)) &&
-      EncodingUtils::FindEncodingForLabel(charset, charset)) {
-    mDecoder = EncodingUtils::DecoderForEncoding(charset);
-    return true;
-  }
-
-  // Check the hint charset from the script element or preload
-  // request.
-  nsAutoString hintCharset;
-  if (!mRequest->IsPreload()) {
-    mRequest->mElement->GetScriptCharset(hintCharset);
-  } else {
-    nsTArray<nsScriptLoader::PreloadInfo>::index_type i =
-      mScriptLoader->mPreloads.IndexOf(mRequest, 0,
-            nsScriptLoader::PreloadRequestComparator());
-
-    NS_ASSERTION(i != mScriptLoader->mPreloads.NoIndex,
-                 "Incorrect preload bookkeeping");
-    hintCharset = mScriptLoader->mPreloads[i].mCharset;
-  }
-
-  if (EncodingUtils::FindEncodingForLabel(hintCharset, charset)) {
-    mDecoder = EncodingUtils::DecoderForEncoding(charset);
-    return true;
-  }
-
-  // Get the charset from the charset of the document.
-  if (mScriptLoader->mDocument) {
-    charset = mScriptLoader->mDocument->GetDocumentCharacterSet();
-    mDecoder = EncodingUtils::DecoderForEncoding(charset);
-    return true;
-  }
-
-  // Curiously, there are various callers that don't pass aDocument. The
-  // fallback in the old code was ISO-8859-1, which behaved like
-  // windows-1252. Saying windows-1252 for clarity and for compliance
-  // with the Encoding Standard.
-  charset = "windows-1252";
-  mDecoder = EncodingUtils::DecoderForEncoding(charset);
-  return true;
-}
-
-NS_IMETHODIMP
-nsScriptLoadHandler::OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
-                                      nsISupports* aContext,
-                                      nsresult aStatus,
-                                      uint32_t aDataLength,
-                                      const uint8_t* aData)
-{
-  if (!mRequest->IsCanceled()) {
-    DebugOnly<bool> encoderSet =
-      EnsureDecoder(aLoader, aData, aDataLength, /* aEndOfStream = */ true);
-    MOZ_ASSERT(encoderSet);
-    DebugOnly<nsresult> rv = TryDecodeRawData(aData, aDataLength,
-                                              /* aEndOfStream = */ true);
-
-    // If SRI is required for this load, appending new bytes to the hash.
-    if (mSRIDataVerifier && NS_SUCCEEDED(mSRIStatus)) {
-      mSRIStatus = mSRIDataVerifier->Update(aDataLength, aData);
-    }
-  }
-
-  // we have to mediate and use mRequest.
-  return mScriptLoader->OnStreamComplete(aLoader, mRequest, aStatus, mSRIStatus,
-                                         mBuffer, mSRIDataVerifier);
-}
diff --git a/dom/base/nsScriptLoader.h b/dom/base/nsScriptLoader.h
deleted file mode 100644
index a00239be5..000000000
--- a/dom/base/nsScriptLoader.h
+++ /dev/null
@@ -1,717 +0,0 @@
-/* -*- 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/. */
-
-/*
- * A class that handles loading and evaluation of <script> elements.
- */
-
-#ifndef __nsScriptLoader_h__
-#define __nsScriptLoader_h__
-
-#include "nsCOMPtr.h"
-#include "nsRefPtrHashtable.h"
-#include "nsIUnicodeDecoder.h"
-#include "nsIScriptElement.h"
-#include "nsCOMArray.h"
-#include "nsCycleCollectionParticipant.h"
-#include "nsTArray.h"
-#include "nsAutoPtr.h"
-#include "nsIDocument.h"
-#include "nsIIncrementalStreamLoader.h"
-#include "nsURIHashKey.h"
-#include "mozilla/CORSMode.h"
-#include "mozilla/dom/SRIMetadata.h"
-#include "mozilla/dom/SRICheck.h"
-#include "mozilla/LinkedList.h"
-#include "mozilla/MozPromise.h"
-#include "mozilla/net/ReferrerPolicy.h"
-#include "mozilla/Vector.h"
-
-class nsModuleLoadRequest;
-class nsModuleScript;
-class nsScriptLoadRequestList;
-class nsIURI;
-
-namespace JS {
-  class SourceBufferHolder;
-} // namespace JS
-
-namespace mozilla {
-namespace dom {
-class AutoJSAPI;
-} // namespace dom
-} // namespace mozilla
-
-//////////////////////////////////////////////////////////////
-// Per-request data structure
-//////////////////////////////////////////////////////////////
-
-enum class nsScriptKind {
-  Classic,
-  Module
-};
-
-class nsScriptLoadRequest : public nsISupports,
-                            private mozilla::LinkedListElement<nsScriptLoadRequest>
-{
-  typedef LinkedListElement<nsScriptLoadRequest> super;
-
-  // Allow LinkedListElement<nsScriptLoadRequest> to cast us to itself as needed.
-  friend class mozilla::LinkedListElement<nsScriptLoadRequest>;
-  friend class nsScriptLoadRequestList;
-
-protected:
-  virtual ~nsScriptLoadRequest();
-
-public:
-  nsScriptLoadRequest(nsScriptKind aKind,
-                      nsIScriptElement* aElement,
-                      uint32_t aVersion,
-                      mozilla::CORSMode aCORSMode,
-                      const mozilla::dom::SRIMetadata &aIntegrity)
-    : mKind(aKind),
-      mElement(aElement),
-      mProgress(Progress::Loading),
-      mIsInline(true),
-      mHasSourceMapURL(false),
-      mIsDefer(false),
-      mIsAsync(false),
-      mIsNonAsyncScriptInserted(false),
-      mIsXSLT(false),
-      mIsCanceled(false),
-      mWasCompiledOMT(false),
-      mOffThreadToken(nullptr),
-      mScriptTextBuf(nullptr),
-      mScriptTextLength(0),
-      mJSVersion(aVersion),
-      mLineNo(1),
-      mCORSMode(aCORSMode),
-      mIntegrity(aIntegrity),
-      mReferrerPolicy(mozilla::net::RP_Default)
-  {
-  }
-
-  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
-  NS_DECL_CYCLE_COLLECTION_CLASS(nsScriptLoadRequest)
-
-  bool IsModuleRequest() const
-  {
-    return mKind == nsScriptKind::Module;
-  }
-
-  nsModuleLoadRequest* AsModuleRequest();
-
-  void FireScriptAvailable(nsresult aResult)
-  {
-    mElement->ScriptAvailable(aResult, mElement, mIsInline, mURI, mLineNo);
-  }
-  void FireScriptEvaluated(nsresult aResult)
-  {
-    mElement->ScriptEvaluated(aResult, mElement, mIsInline);
-  }
-
-  bool IsPreload()
-  {
-    return mElement == nullptr;
-  }
-
-  virtual void Cancel();
-
-  bool IsCanceled() const
-  {
-    return mIsCanceled;
-  }
-
-  virtual void SetReady();
-
-  void** OffThreadTokenPtr()
-  {
-    return mOffThreadToken ?  &mOffThreadToken : nullptr;
-  }
-
-  enum class Progress {
-    Loading,
-    Compiling,
-    FetchingImports,
-    Ready
-  };
-  bool IsReadyToRun() const {
-    return mProgress == Progress::Ready;
-  }
-  bool IsLoading() const {
-    return mProgress == Progress::Loading;
-  }
-  bool InCompilingStage() const {
-    return mProgress == Progress::Compiling ||
-           (IsReadyToRun() && mWasCompiledOMT);
-  }
-
-  void MaybeCancelOffThreadScript();
-
-  using super::getNext;
-  using super::isInList;
-
-  const nsScriptKind mKind;
-  nsCOMPtr<nsIScriptElement> mElement;
-  Progress mProgress;     // Are we still waiting for a load to complete?
-  bool mIsInline;         // Is the script inline or loaded?
-  bool mHasSourceMapURL;  // Does the HTTP header have a source map url?
-  bool mIsDefer;          // True if we live in mDeferRequests.
-  bool mIsAsync;          // True if we live in mLoadingAsyncRequests or mLoadedAsyncRequests.
-  bool mIsNonAsyncScriptInserted; // True if we live in mNonAsyncExternalScriptInsertedRequests
-  bool mIsXSLT;           // True if we live in mXSLTRequests.
-  bool mIsCanceled;       // True if we have been explicitly canceled.
-  bool mWasCompiledOMT;   // True if the script has been compiled off main thread.
-  void* mOffThreadToken;  // Off-thread parsing token.
-  nsString mSourceMapURL; // Holds source map url for loaded scripts
-  char16_t* mScriptTextBuf; // Holds script text for non-inline scripts. Don't
-  size_t mScriptTextLength; // use nsString so we can give ownership to jsapi.
-  uint32_t mJSVersion;
-  nsCOMPtr<nsIURI> mURI;
-  nsCOMPtr<nsIPrincipal> mOriginPrincipal;
-  nsAutoCString mURL;     // Keep the URI's filename alive during off thread parsing.
-  int32_t mLineNo;
-  const mozilla::CORSMode mCORSMode;
-  const mozilla::dom::SRIMetadata mIntegrity;
-  mozilla::net::ReferrerPolicy mReferrerPolicy;
-};
-
-class nsScriptLoadRequestList : private mozilla::LinkedList<nsScriptLoadRequest>
-{
-  typedef mozilla::LinkedList<nsScriptLoadRequest> super;
-
-public:
-  ~nsScriptLoadRequestList();
-
-  void Clear();
-
-#ifdef DEBUG
-  bool Contains(nsScriptLoadRequest* aElem) const;
-#endif // DEBUG
-
-  using super::getFirst;
-  using super::isEmpty;
-
-  void AppendElement(nsScriptLoadRequest* aElem)
-  {
-    MOZ_ASSERT(!aElem->isInList());
-    NS_ADDREF(aElem);
-    insertBack(aElem);
-  }
-
-  MOZ_MUST_USE
-  already_AddRefed<nsScriptLoadRequest> Steal(nsScriptLoadRequest* aElem)
-  {
-    aElem->removeFrom(*this);
-    return dont_AddRef(aElem);
-  }
-
-  MOZ_MUST_USE
-  already_AddRefed<nsScriptLoadRequest> StealFirst()
-  {
-    MOZ_ASSERT(!isEmpty());
-    return Steal(getFirst());
-  }
-
-  void Remove(nsScriptLoadRequest* aElem)
-  {
-    aElem->removeFrom(*this);
-    NS_RELEASE(aElem);
-  }
-};
-
-//////////////////////////////////////////////////////////////
-// Script loader implementation
-//////////////////////////////////////////////////////////////
-
-class nsScriptLoader final : public nsISupports
-{
-  class MOZ_STACK_CLASS AutoCurrentScriptUpdater
-  {
-  public:
-    AutoCurrentScriptUpdater(nsScriptLoader* aScriptLoader,
-                             nsIScriptElement* aCurrentScript)
-      : mOldScript(aScriptLoader->mCurrentScript)
-      , mScriptLoader(aScriptLoader)
-    {
-      mScriptLoader->mCurrentScript = aCurrentScript;
-    }
-    ~AutoCurrentScriptUpdater()
-    {
-      mScriptLoader->mCurrentScript.swap(mOldScript);
-    }
-  private:
-    nsCOMPtr<nsIScriptElement> mOldScript;
-    nsScriptLoader* mScriptLoader;
-  };
-
-  friend class nsModuleLoadRequest;
-  friend class nsScriptRequestProcessor;
-  friend class nsScriptLoadHandler;
-  friend class AutoCurrentScriptUpdater;
-
-public:
-  explicit nsScriptLoader(nsIDocument* aDocument);
-
-  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
-  NS_DECL_CYCLE_COLLECTION_CLASS(nsScriptLoader)
-
-  /**
-   * The loader maintains a weak reference to the document with
-   * which it is initialized. This call forces the reference to
-   * be dropped.
-   */
-  void DropDocumentReference()
-  {
-    mDocument = nullptr;
-  }
-
-  /**
-   * Add an observer for all scripts loaded through this loader.
-   *
-   * @param aObserver observer for all script processing.
-   */
-  nsresult AddObserver(nsIScriptLoaderObserver* aObserver)
-  {
-    return mObservers.AppendObject(aObserver) ? NS_OK :
-      NS_ERROR_OUT_OF_MEMORY;
-  }
-
-  /**
-   * Remove an observer.
-   *
-   * @param aObserver observer to be removed
-   */
-  void RemoveObserver(nsIScriptLoaderObserver* aObserver)
-  {
-    mObservers.RemoveObject(aObserver);
-  }
-
-  /**
-   * Process a script element. This will include both loading the 
-   * source of the element if it is not inline and evaluating
-   * the script itself.
-   *
-   * If the script is an inline script that can be executed immediately
-   * (i.e. there are no other scripts pending) then ScriptAvailable
-   * and ScriptEvaluated will be called before the function returns.
-   *
-   * If true is returned the script could not be executed immediately.
-   * In this case ScriptAvailable is guaranteed to be called at a later
-   * point (as well as possibly ScriptEvaluated).
-   *
-   * @param aElement The element representing the script to be loaded and
-   *        evaluated.
-   */
-  bool ProcessScriptElement(nsIScriptElement* aElement);
-
-  /**
-   * Gets the currently executing script. This is useful if you want to
-   * generate a unique key based on the currently executing script.
-   */
-  nsIScriptElement* GetCurrentScript()
-  {
-    return mCurrentScript;
-  }
-
-  nsIScriptElement* GetCurrentParserInsertedScript()
-  {
-    return mCurrentParserInsertedScript;
-  }
-
-  /**
-   * Whether the loader is enabled or not.
-   * When disabled, processing of new script elements is disabled. 
-   * Any call to ProcessScriptElement() will return false. Note that
-   * this DOES NOT disable currently loading or executing scripts.
-   */
-  bool GetEnabled()
-  {
-    return mEnabled;
-  }
-  void SetEnabled(bool aEnabled)
-  {
-    if (!mEnabled && aEnabled) {
-      ProcessPendingRequestsAsync();
-    }
-    mEnabled = aEnabled;
-  }
-
-  /**
-   * Add/remove a blocker for parser-blocking scripts (and XSLT
-   * scripts). Blockers will stop such scripts from executing, but not from
-   * loading.
-   */
-  void AddParserBlockingScriptExecutionBlocker()
-  {
-    ++mParserBlockingBlockerCount;
-  }
-  void RemoveParserBlockingScriptExecutionBlocker()
-  {
-    if (!--mParserBlockingBlockerCount && ReadyToExecuteScripts()) {
-      ProcessPendingRequestsAsync();
-    }
-  }
-
-  /**
-   * Add/remove a blocker for execution of all scripts.  Blockers will stop
-   * scripts from executing, but not from loading.
-   */
-  void AddExecuteBlocker()
-  {
-    ++mBlockerCount;
-  }
-  void RemoveExecuteBlocker()
-  {
-    MOZ_ASSERT(mBlockerCount);
-    if (!--mBlockerCount) {
-      ProcessPendingRequestsAsync();
-    }
-  }
-
-  /**
-   * Convert the given buffer to a UTF-16 string.
-   * @param aChannel     Channel corresponding to the data. May be null.
-   * @param aData        The data to convert
-   * @param aLength      Length of the data
-   * @param aHintCharset Hint for the character set (e.g., from a charset
-   *                     attribute). May be the empty string.
-   * @param aDocument    Document which the data is loaded for. Must not be
-   *                     null.
-   * @param aBufOut      [out] char16_t array allocated by ConvertToUTF16 and
-   *                     containing data converted to unicode.  Caller must
-   *                     js_free() this data when no longer needed.
-   * @param aLengthOut   [out] Length of array returned in aBufOut in number
-   *                     of char16_t code units.
-   */
-  static nsresult ConvertToUTF16(nsIChannel* aChannel, const uint8_t* aData,
-                                 uint32_t aLength,
-                                 const nsAString& aHintCharset,
-                                 nsIDocument* aDocument,
-                                 char16_t*& aBufOut, size_t& aLengthOut);
-
-  /**
-   * Handle the completion of a stream.  This is called by the
-   * nsScriptLoadHandler object which observes the IncrementalStreamLoader
-   * loading the script.
-   */
-  nsresult OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
-                            nsISupports* aContext,
-                            nsresult aChannelStatus,
-                            nsresult aSRIStatus,
-                            mozilla::Vector<char16_t> &aString,
-                            mozilla::dom::SRICheckDataVerifier* aSRIDataVerifier);
-
-  /**
-   * Processes any pending requests that are ready for processing.
-   */
-  void ProcessPendingRequests();
-
-  /**
-   * Starts deferring deferred scripts and puts them in the mDeferredRequests
-   * queue instead.
-   */
-  void BeginDeferringScripts()
-  {
-    mDeferEnabled = true;
-    if (mDocument) {
-      mDocument->BlockOnload();
-    }
-  }
-
-  /**
-   * Notifies the script loader that parsing is done.  If aTerminated is true,
-   * this will drop any pending scripts that haven't run yet.  Otherwise, it
-   * will stops deferring scripts and immediately processes the
-   * mDeferredRequests queue.
-   *
-   * WARNING: This function will synchronously execute content scripts, so be
-   * prepared that the world might change around you.
-   */
-  void ParsingComplete(bool aTerminated);
-
-  /**
-   * Returns the number of pending scripts, deferred or not.
-   */
-  uint32_t HasPendingOrCurrentScripts()
-  {
-    return mCurrentScript || mParserBlockingRequest;
-  }
-
-  /**
-   * Adds aURI to the preload list and starts loading it.
-   *
-   * @param aURI The URI of the external script.
-   * @param aCharset The charset parameter for the script.
-   * @param aType The type parameter for the script.
-   * @param aCrossOrigin The crossorigin attribute for the script.
-   *                     Void if not present.
-   * @param aIntegrity The expect hash url, if avail, of the request
-   * @param aScriptFromHead Whether or not the script was a child of head
-   */
-  virtual void PreloadURI(nsIURI *aURI, const nsAString &aCharset,
-                          const nsAString &aType,
-                          const nsAString &aCrossOrigin,
-                          const nsAString& aIntegrity,
-                          bool aScriptFromHead,
-                          const mozilla::net::ReferrerPolicy aReferrerPolicy);
-
-  /**
-   * Process a request that was deferred so that the script could be compiled
-   * off thread.
-   */
-  nsresult ProcessOffThreadRequest(nsScriptLoadRequest *aRequest);
-
-  bool AddPendingChildLoader(nsScriptLoader* aChild) {
-    return mPendingChildLoaders.AppendElement(aChild) != nullptr;
-  }
-
-private:
-  virtual ~nsScriptLoader();
-
-  nsScriptLoadRequest* CreateLoadRequest(
-    nsScriptKind aKind,
-    nsIScriptElement* aElement,
-    uint32_t aVersion,
-    mozilla::CORSMode aCORSMode,
-    const mozilla::dom::SRIMetadata &aIntegrity);
-
-  /**
-   * Unblocks the creator parser of the parser-blocking scripts.
-   */
-  void UnblockParser(nsScriptLoadRequest* aParserBlockingRequest);
-
-  /**
-   * Asynchronously resumes the creator parser of the parser-blocking scripts.
-   */
-  void ContinueParserAsync(nsScriptLoadRequest* aParserBlockingRequest);
-
-
-  /**
-   * Helper function to check the content policy for a given request.
-   */
-  static nsresult CheckContentPolicy(nsIDocument* aDocument,
-                                     nsISupports *aContext,
-                                     nsIURI *aURI,
-                                     const nsAString &aType,
-                                     bool aIsPreLoad);
-
-  /**
-   * Start a load for aRequest's URI.
-   */
-  nsresult StartLoad(nsScriptLoadRequest *aRequest, const nsAString &aType,
-                     bool aScriptFromHead);
-
-  /**
-   * Process any pending requests asynchronously (i.e. off an event) if there
-   * are any. Note that this is a no-op if there aren't any currently pending
-   * requests.
-   *
-   * This function is virtual to allow cross-library calls to SetEnabled()
-   */
-  virtual void ProcessPendingRequestsAsync();
-
-  /**
-   * If true, the loader is ready to execute parser-blocking scripts, and so are
-   * all its ancestors.  If the loader itself is ready but some ancestor is not,
-   * this function will add an execute blocker and ask the ancestor to remove it
-   * once it becomes ready.
-   */
-  bool ReadyToExecuteParserBlockingScripts();
-
-  /**
-   * Return whether just this loader is ready to execute parser-blocking
-   * scripts.
-   */
-  bool SelfReadyToExecuteParserBlockingScripts()
-  {
-    return ReadyToExecuteScripts() && !mParserBlockingBlockerCount;
-  }
-
-  /**
-   * Return whether this loader is ready to execute scripts in general.
-   */
-  bool ReadyToExecuteScripts()
-  {
-    return mEnabled && !mBlockerCount;
-  }
-
-  nsresult AttemptAsyncScriptCompile(nsScriptLoadRequest* aRequest);
-  nsresult ProcessRequest(nsScriptLoadRequest* aRequest);
-  nsresult CompileOffThreadOrProcessRequest(nsScriptLoadRequest* aRequest);
-  void FireScriptAvailable(nsresult aResult,
-                           nsScriptLoadRequest* aRequest);
-  void FireScriptEvaluated(nsresult aResult,
-                           nsScriptLoadRequest* aRequest);
-  nsresult EvaluateScript(nsScriptLoadRequest* aRequest);
-
-  already_AddRefed<nsIScriptGlobalObject> GetScriptGlobalObject();
-  nsresult FillCompileOptionsForRequest(const mozilla::dom::AutoJSAPI& jsapi,
-                                        nsScriptLoadRequest* aRequest,
-                                        JS::Handle<JSObject*> aScopeChain,
-                                        JS::CompileOptions* aOptions);
-
-  uint32_t NumberOfProcessors();
-  nsresult PrepareLoadedRequest(nsScriptLoadRequest* aRequest,
-                                nsIIncrementalStreamLoader* aLoader,
-                                nsresult aStatus,
-                                mozilla::Vector<char16_t> &aString);
-
-  void AddDeferRequest(nsScriptLoadRequest* aRequest);
-  bool MaybeRemovedDeferRequests();
-
-  void MaybeMoveToLoadedList(nsScriptLoadRequest* aRequest);
-
-  JS::SourceBufferHolder GetScriptSource(nsScriptLoadRequest* aRequest,
-                                         nsAutoString& inlineData);
-
-  bool ModuleScriptsEnabled();
-
-  void SetModuleFetchStarted(nsModuleLoadRequest *aRequest);
-  void SetModuleFetchFinishedAndResumeWaitingRequests(nsModuleLoadRequest *aRequest,
-                                                      nsresult aResult);
-
-  bool IsFetchingModule(nsModuleLoadRequest *aRequest) const;
-
-  bool ModuleMapContainsModule(nsModuleLoadRequest *aRequest) const;
-  RefPtr<mozilla::GenericPromise> WaitForModuleFetch(nsModuleLoadRequest *aRequest);
-  nsModuleScript* GetFetchedModule(nsIURI* aURL) const;
-
-  friend bool
-  HostResolveImportedModule(JSContext* aCx, unsigned argc, JS::Value* vp);
-
-  nsresult CreateModuleScript(nsModuleLoadRequest* aRequest);
-  nsresult ProcessFetchedModuleSource(nsModuleLoadRequest* aRequest);
-  void ProcessLoadedModuleTree(nsModuleLoadRequest* aRequest);
-  bool InstantiateModuleTree(nsModuleLoadRequest* aRequest);
-  void StartFetchingModuleDependencies(nsModuleLoadRequest* aRequest);
-
-  RefPtr<mozilla::GenericPromise>
-  StartFetchingModuleAndDependencies(nsModuleLoadRequest* aRequest, nsIURI* aURI);
-
-  nsIDocument* mDocument;                   // [WEAK]
-  nsCOMArray<nsIScriptLoaderObserver> mObservers;
-  nsScriptLoadRequestList mNonAsyncExternalScriptInsertedRequests;
-  // mLoadingAsyncRequests holds async requests while they're loading; when they
-  // have been loaded they are moved to mLoadedAsyncRequests.
-  nsScriptLoadRequestList mLoadingAsyncRequests;
-  nsScriptLoadRequestList mLoadedAsyncRequests;
-  nsScriptLoadRequestList mDeferRequests;
-  nsScriptLoadRequestList mXSLTRequests;
-  RefPtr<nsScriptLoadRequest> mParserBlockingRequest;
-
-  // In mRequests, the additional information here is stored by the element.
-  struct PreloadInfo {
-    RefPtr<nsScriptLoadRequest> mRequest;
-    nsString mCharset;
-  };
-
-  friend void ImplCycleCollectionUnlink(nsScriptLoader::PreloadInfo& aField);
-  friend void ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
-                                          nsScriptLoader::PreloadInfo& aField,
-                                          const char* aName, uint32_t aFlags);
-
-  struct PreloadRequestComparator {
-    bool Equals(const PreloadInfo &aPi, nsScriptLoadRequest * const &aRequest)
-        const
-    {
-      return aRequest == aPi.mRequest;
-    }
-  };
-  struct PreloadURIComparator {
-    bool Equals(const PreloadInfo &aPi, nsIURI * const &aURI) const;
-  };
-  nsTArray<PreloadInfo> mPreloads;
-
-  nsCOMPtr<nsIScriptElement> mCurrentScript;
-  nsCOMPtr<nsIScriptElement> mCurrentParserInsertedScript;
-  nsTArray< RefPtr<nsScriptLoader> > mPendingChildLoaders;
-  uint32_t mParserBlockingBlockerCount;
-  uint32_t mBlockerCount;
-  uint32_t mNumberOfProcessors;
-  bool mEnabled;
-  bool mDeferEnabled;
-  bool mDocumentParsingDone;
-  bool mBlockingDOMContentLoaded;
-
-  // Module map
-  nsRefPtrHashtable<nsURIHashKey, mozilla::GenericPromise::Private> mFetchingModules;
-  nsRefPtrHashtable<nsURIHashKey, nsModuleScript> mFetchedModules;
-
-  nsCOMPtr<nsIConsoleReportCollector> mReporter;
-};
-
-class nsScriptLoadHandler final : public nsIIncrementalStreamLoaderObserver
-{
-public:
-  explicit nsScriptLoadHandler(nsScriptLoader* aScriptLoader,
-                               nsScriptLoadRequest *aRequest,
-                               mozilla::dom::SRICheckDataVerifier *aSRIDataVerifier);
-
-  NS_DECL_ISUPPORTS
-  NS_DECL_NSIINCREMENTALSTREAMLOADEROBSERVER
-
-private:
-  virtual ~nsScriptLoadHandler();
-
-  /*
-   * Try to decode some raw data.
-   */
-  nsresult TryDecodeRawData(const uint8_t* aData, uint32_t aDataLength,
-                            bool aEndOfStream);
-
-  /*
-   * Discover the charset by looking at the stream data, the script
-   * tag, and other indicators.  Returns true if charset has been
-   * discovered.
-   */
-  bool EnsureDecoder(nsIIncrementalStreamLoader *aLoader,
-                     const uint8_t* aData, uint32_t aDataLength,
-                     bool aEndOfStream);
-
-  // ScriptLoader which will handle the parsed script.
-  RefPtr<nsScriptLoader>        mScriptLoader;
-
-  // The nsScriptLoadRequest for this load.
-  RefPtr<nsScriptLoadRequest>   mRequest;
-
-  // SRI data verifier.
-  nsAutoPtr<mozilla::dom::SRICheckDataVerifier> mSRIDataVerifier;
-
-  // Status of SRI data operations.
-  nsresult                      mSRIStatus;
-
-  // Unicode decoder for charset.
-  nsCOMPtr<nsIUnicodeDecoder>   mDecoder;
-
-  // Accumulated decoded char buffer.
-  mozilla::Vector<char16_t>     mBuffer;
-};
-
-class nsAutoScriptLoaderDisabler
-{
-public:
-  explicit nsAutoScriptLoaderDisabler(nsIDocument* aDoc)
-  {
-    mLoader = aDoc->ScriptLoader();
-    mWasEnabled = mLoader->GetEnabled();
-    if (mWasEnabled) {
-      mLoader->SetEnabled(false);
-    }
-  }
-
-  ~nsAutoScriptLoaderDisabler()
-  {
-    if (mWasEnabled) {
-      mLoader->SetEnabled(true);
-    }
-  }
-
-  bool mWasEnabled;
-  RefPtr<nsScriptLoader> mLoader;
-};
-
-#endif //__nsScriptLoader_h__
author	Moonchild <moonchild@palemoon.org>	2020-06-30 11:32:07 +0000
committer	Moonchild <moonchild@palemoon.org>	2020-07-10 18:28:50 +0000
commit	0633844f46858135ee62d396829c6292492ca117 (patch)
tree	051f8c4a50ab5c955f5d4e70e4de0ea50151758e /dom/base
parent	d0126b96cd6527e6dc89530b333fb0c196aba30d (diff)
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